JP2003095759A - Ceramic structure and method for manufacturing the same - Google Patents
Ceramic structure and method for manufacturing the sameInfo
- Publication number
- JP2003095759A JP2003095759A JP2001286743A JP2001286743A JP2003095759A JP 2003095759 A JP2003095759 A JP 2003095759A JP 2001286743 A JP2001286743 A JP 2001286743A JP 2001286743 A JP2001286743 A JP 2001286743A JP 2003095759 A JP2003095759 A JP 2003095759A
- Authority
- JP
- Japan
- Prior art keywords
- female screw
- screw member
- sheath tube
- ceramic structure
- sheath
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、セラミックスか
らなる雌ねじ体に係り、耐熱特性、耐腐食特性、電気的
絶縁特性が要求される例えば土木、電気関係に好適な、
強度を向上した雌ねじ部を備えるセラミックス構造体及
びその製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a female screw body made of ceramics, and is suitable for, for example, civil engineering and electrical relations, which require heat resistance, corrosion resistance, and electrical insulation characteristics.
The present invention relates to a ceramic structure including a female screw portion having improved strength and a method for manufacturing the same.
【０００２】[0002]
【従来の技術】一般に、部材の耐熱特性、耐腐食特性、
電気的腐食性の誘発などを改善するために、金属に代え
てセラミックス化するなどの傾向がある。特に、土木関
係では、コンクリート構造物の耐久性を向上するため
に、金属からセラミックスに移行する傾向にある。例え
ば、コンクリート型枠保持装置の端止体（継ぎ手）とし
ては、各種のものが知られている。例えば、特開平８−
１３５１８７においては、金属製雌ねじ部をセラミック
スで覆ったものが示され、特開平９−３２４５３７にお
いては、金属製雌ねじ部を分割セラミックス筒体で保持
したものが示されている。又、特開２０００−３４５７
１６や特開２０００−３４５７０４においては、金属製
雌ねじ部をモルタルで覆ったものが示され、特開平１１
−２０２５においては、金属製雌ねじ部を合成樹脂で覆
ったものが示されている。2. Description of the Related Art Generally, heat resistance and corrosion resistance of members,
In order to improve the induction of electrical corrosiveness, there is a tendency to use ceramics instead of metal. Especially in civil engineering, there is a tendency to shift from metal to ceramics in order to improve the durability of concrete structures. For example, various types are known as end stoppers (joints) of concrete formwork holding devices. For example, Japanese Patent Laid-Open No. 8-
In 135187, a metallic female screw portion is covered with ceramics, and in Japanese Patent Laid-Open No. 9-324537, a metallic female screw portion is held with a divided ceramic cylinder. Also, Japanese Patent Laid-Open No. 2000-3457
16 and Japanese Unexamined Patent Publication No. 2000-345704, a metallic female screw portion covered with mortar is disclosed.
-2025 shows a metallic female screw portion covered with a synthetic resin.
【０００３】又、特開平６−２７９１３１、同１０−２
７２６１４などにおいては、セラミックス部材同士を焼
成収縮率の差を利用して嵌着結合することにより、気密
性、接合強度に優れたものを得る技術が示されている。Further, JP-A-6-279131 and 10-2.
In 72614 and the like, there is disclosed a technique in which ceramic members are fitted and joined together by utilizing the difference in firing shrinkage ratio to obtain a material having excellent airtightness and bonding strength.
【０００４】しかし、本発明のように、圧縮力を付与す
ることにより強度を高めるセラミックス構造体の製造方
法の思想は開示されていない。However, the idea of a method of manufacturing a ceramic structure which increases the strength by applying a compressive force like the present invention is not disclosed.
【０００５】[0005]
【発明が解決しようとする課題】上記した従来の端止体
においては、金属製雌ねじ部を合成樹脂で覆ったもの
は、合成樹脂部が経年により劣化して金属製雌ねじ部が
腐食し、金属製セパレータへ腐食が波及することとなっ
た。又、金属製雌ねじ部を無機質（モルタル、セラミッ
クス）で覆ったものは、覆った部分の劣化はないもの
の、内部の金属製雌ねじ部が腐食し、金属性セパレータ
へ腐食が波及することとなった。従って、端止体で腐食
が始まると、コンクリート構造体の表面部にクラックが
発生するなどの劣化が始まり、コンクリート構造体の耐
久性を損なうこととなった。In the above-mentioned conventional end stopper, in which the metallic female screw portion is covered with the synthetic resin, the synthetic resin portion is deteriorated with age and the metallic female screw portion is corroded. Corrosion spread to the manufactured separator. Also, in the case where the metallic female screw portion is covered with an inorganic substance (mortar, ceramics), although the covered portion is not deteriorated, the internal metallic female screw portion is corroded and the corrosion spreads to the metallic separator. . Therefore, when corrosion starts at the end stopper, deterioration such as cracking on the surface of the concrete structure begins, and the durability of the concrete structure is impaired.
【０００６】一方、発明者らは、図９（ａ）に示すよう
に、隔壁１ａを介して雌ねじ部１ｂ，１ｃを備えた雌ね
じ体１をアルミナセラミックス（アルミナ９６重量％）
の焼結体で形成し、図９（ｂ）に示すように各雌ねじ部
１ｂ，１ｃにそれぞれボルト２，３を螺合し、一方のボ
ルト３を固定して他方のボルト２を矢印のように引っ張
って引っ張り試験を行った所、ボルト２の先端部を起点
にして雌ねじ体１の外周面方向に発生した破断面１ｄに
より破断した。せん断強度は、２．６０〜２．９０ＫＮ
であった。なお、試験に使用した雌ねじ体１の焼結後の
寸法関係は図１０に示す通りである。すなわち、最大径
２７ｍｍ、両端部の径１９ｍｍ、全長３５ｍｍ、雌ねじ
部１ｂ，１ｃは共にねじ径がＷ３／８でねじ山の数は７
〜８山であり、雌ねじ部１ｂの長さは端部側に形成され
た径大部１ｅを含めて１８．５ｍｍ、雌ねじ部１ｅの長
さは１３．５ｍｍ、隔壁１ａの厚さは３．０ｍｍであ
る。On the other hand, as shown in FIG. 9 (a), the present inventors have prepared a female screw body 1 having female screw portions 1b and 1c through a partition wall 1a as alumina ceramics (96% by weight of alumina).
9B, the bolts 2 and 3 are screwed into the female screw portions 1b and 1c, respectively, and one bolt 3 is fixed and the other bolt 2 is attached as shown by an arrow. When the tensile test was conducted by pulling the bolt, the fractured surface 1d was generated in the direction of the outer peripheral surface of the female screw body 1 with the tip of the bolt 2 as the starting point. Shear strength is 2.60-2.90KN
Met. The dimensional relationship after sintering of the female screw body 1 used in the test is as shown in FIG. That is, the maximum diameter is 27 mm, the diameters of both ends are 19 mm, the total length is 35 mm, and the female screw portions 1b and 1c each have a screw diameter of W3 / 8 and seven screw threads.
The length of the internal threaded portion 1b is 18.5 mm including the large diameter portion 1e formed on the end side, the internal threaded portion 1e has a length of 13.5 mm, and the partition wall 1a has a thickness of 3. It is 0 mm.
【０００７】この結果からも明らかなように、腐食を発
生せず、コンクリート構造体の耐久性を損うことがない
セラミックスは圧縮力に強いが、靭性に欠け、引っ張り
力に弱いことから、コンクリートに埋設する以前の状態
において引っ張り力が作用する構造体への使用普及には
限界があった。As is clear from these results, ceramics that do not corrode and do not impair the durability of concrete structures are strong in compressive force, but lack in toughness and weak in tensile force. There was a limit to the widespread use of the structure in which tensile force acts before it was buried in the structure.
【０００８】そこで、発明者らは研究を重ね、図１１に
示すようなセラミックス構造体を考案した。図におい
て、５は隔壁５ａを介して一対の穴５ｂ，５ｃを設けた
アルミナセラミックスの未焼結体からなる鞘管、４はア
ルミナセラミックスの焼結体からなる筒状の雌ねじ部材
であり、その内周には貫通した雌ねじ部４ａが設けてあ
る。そして、鞘管５の穴５ｂ，５ｃ内にそれぞれ雌ねじ
部材４を装着し、これらを焼成して鞘管５を焼結する。
この焼結の際に鞘管５は収縮し、鞘管５は雌ねじ部材４
を加圧圧縮し、両者は嵌合密着結合し、セラミックス構
造体６が形成される。このとき、両者間に拡散結合は一
部を除いて生じない。このように、鞘管５と雌ねじ部材
４との間に締め付け圧縮力が作用することにより、セラ
ミックス構造体６の引っ張り強度は向上する。従って、
全体的な拡散結合が生じると、雌ねじ部材４と鞘管５が
同一体となってしまい、好ましくない。Therefore, the inventors have conducted extensive research and devised a ceramic structure as shown in FIG. In the figure, 5 is a sheath tube made of a non-sintered body of alumina ceramics having a pair of holes 5b, 5c through a partition wall 5a, and 4 is a cylindrical female screw member made of a sintered body of alumina ceramics. A female screw portion 4a that penetrates the inner circumference is provided. Then, the female screw members 4 are mounted in the holes 5b and 5c of the sheath tube 5, respectively, and these are fired to sinter the sheath tube 5.
During this sintering, the sheath tube 5 contracts, and the sheath tube 5 is inserted into the female screw member 4
Are pressed and compressed, and the two are fitted and tightly bonded to each other to form the ceramic structure 6. At this time, diffusion coupling does not occur between the two except a part. As described above, the tightening compression force acts between the sheath tube 5 and the female screw member 4, so that the tensile strength of the ceramic structure 6 is improved. Therefore,
If overall diffusion bonding occurs, the female screw member 4 and the sheath pipe 5 will be the same body, which is not preferable.
【０００９】ここで、図１２に示すように、一対の雌ね
じ部材４の雌ねじ部４ａにボルト２，３を螺合し、一方
のボルト３を固定し、他方のボルト２を引っ張って引っ
張り試験を行うと、従来より大きな耐力が得られること
が判明した。即ち、引っ張り力は従来のように鞘管５に
直接局部的に作用せず、引っ張り力により雌ねじ部材４
に作用する応力は雌ねじ部材４と鞘管５との密着面Ａを
介して鞘管５に分散して作用するので、引っ張り強度が
著しく向上する。Here, as shown in FIG. 12, bolts 2 and 3 are screwed into female screw portions 4a of a pair of female screw members 4, one bolt 3 is fixed, and the other bolt 2 is pulled to perform a pull test. It has been found that a higher yield strength than before can be obtained by carrying out the test. That is, the pulling force does not act locally on the sheath tube 5 as in the conventional case, but the pulling force causes the internal thread member 4 to move.
Since the stress that acts on the sheath pipe 5 is dispersed and acts on the sheath pipe 5 through the contact surface A between the female screw member 4 and the sheath pipe 5, the tensile strength is significantly improved.
【００１０】なお、アルミナセラミックスの焼成時の線
収縮率は１４〜１７％であるが、粒径や加圧成形圧力な
どの条件によって異なる。上記の場合、焼結済の雌ねじ
部材４の外径より若干径が大きい穴５ｂ，５ｃを有する
鞘管５を用意し、この鞘管５を焼成することにより、鞘
管５が雌ねじ部材４を締め付け、圧縮力が作用するよう
にする。若干形状が異なるが、図１３（ａ）は焼成前の
鞘管５の寸法を示し、最大径３１．８ｍｍ、両端部の径
２２．４ｍｍ、穴５ｂ，５ｃの径１７．１ｍｍ、穴５
ｂ，５ｃの深さ２１．８ｍｍ、１５．９ｍｍ、全長４
１．２ｍｍ、隔壁５ａの厚さ３．５ｍｍである。又、図
１０（ｂ）は１６００℃で焼成後（収縮率１５％）の鞘
管５の寸法を示し、最大径２７ｍｍ、両端部の径１９ｍ
ｍ、全長３５ｍｍ、穴５ｂ，５ｃの深さ１８．５ｍｍ、
１３．５ｍｍ、隔壁５ａの厚さ３．０ｍｍである。図１
０（ｃ）は１６００℃で焼成後の雌ねじ部材４の寸法を
示し、外形１５ｍｍ、長さ１３．５ｍｍ、雌ねじ部４ａ
のねじ径はＷ３／８、ねじ山数は７〜８である。雌ねじ
部材４のアルミナ量は９６重量％であり、その成形は静
水圧成型機（通称ＣＩＰ）により５ＭＰａの圧力で成形
する。又、鞘管５の穴５ｂ，５ｃの焼成後の自然状態に
おける径は１４．５ｍｍとなり、雌ねじ部材４の焼成後
の外形は１５ｍｍであるから、１４．５〜１５ｍｍの差
分で鞘管５の穴５ｂ，５ｃが雌ねじ部材４を締め付ける
ことになる。セラミックス構造体６のせん断強度は１
１．５〜１３ＫＮであった。The linear shrinkage rate of the alumina ceramics during firing is 14 to 17%, but it varies depending on the conditions such as the particle size and the pressure molding pressure. In the above case, a sheath pipe 5 having holes 5b and 5c having a diameter slightly larger than the outer diameter of the sintered female screw member 4 is prepared, and the sheath pipe 5 is fired, so that the sheath pipe 5 can hold the female screw member 4 in place. Tighten so that compressive force acts. Although the shape is slightly different, FIG. 13 (a) shows the dimensions of the sheath tube 5 before firing. The maximum diameter is 31.8 mm, the diameters of both ends are 22.4 mm, the diameters of the holes 5b and 5c are 17.1 mm, and the hole 5 is
b, 5c depth 21.8mm, 15.9mm, total length 4
The thickness is 1.2 mm and the partition wall 5a has a thickness of 3.5 mm. Further, FIG. 10B shows the dimensions of the sheath tube 5 after firing at 1600 ° C. (shrinkage rate 15%), the maximum diameter is 27 mm, and the diameters of both ends are 19 m.
m, total length 35 mm, depth of holes 5b and 5c 18.5 mm,
It is 13.5 mm and the thickness of the partition wall 5a is 3.0 mm. Figure 1
0 (c) shows the dimensions of the female screw member 4 after firing at 1600 ° C., the outer diameter is 15 mm, the length is 13.5 mm, and the female screw portion 4 a.
Has a diameter of W3 / 8, and the number of threads is 7-8. The amount of alumina of the female screw member 4 is 96% by weight, and the molding is performed by a hydrostatic pressure molding machine (commonly called CIP) at a pressure of 5 MPa. The diameter of the holes 5b and 5c of the sheath tube 5 in the natural state after firing is 14.5 mm, and the outer diameter of the female screw member 4 after firing is 15 mm. Therefore, the sheath tube 5 has a difference of 14.5 to 15 mm. The holes 5b and 5c tighten the female screw member 4. The shear strength of the ceramic structure 6 is 1
It was 1.5 to 13 KN.
【００１１】この発明は上記のような課題を解決するた
めに成されたものであり、耐腐食性、耐電気腐食性に優
れ、圧縮力、引っ張り力にも強いセラミックス構造体及
びその製造方法を得ることを目的とする。The present invention has been made to solve the above problems, and provides a ceramic structure excellent in corrosion resistance and electric corrosion resistance, and also strong in compressive force and tensile force, and a method for manufacturing the same. The purpose is to get.
【００１２】[0012]
【課題を解決するための手段】発明者らは、上記のよう
に鋭意研究を重ねた結果、雌ねじ体に直接雌ねじ部を設
けて構成した場合には、上記のように破断現象が生じる
が、雌ねじ部材を鞘管で強く圧縮して雌ねじ体（セラミ
ックス構造体）を構成することにより、両者間に存在す
る圧縮作用による雌ねじ部材の強度向上と、密着面の存
在により、引っ張り強度の向上に著しく寄与して雌ねじ
体の耐力を向上できることを見出した。As a result of intensive studies as described above, the inventors have found that when an internal thread portion is directly provided on an internal thread body, the breaking phenomenon occurs as described above. By forming a female screw body (ceramic structure) by strongly compressing the female screw member with a sheath tube, the strength of the female screw member is improved by the compression action existing between them and the tensile strength is remarkably improved due to the existence of the contact surface. It has been found that the contribution can be made to improve the yield strength of the female screw body.
【００１３】この発明の請求項１に係るセラミックス構
造体の製造方法は、外周に凹凸部を有するとともに内周
に雌ねじ部を有する筒状のセラミックスからなる雌ねじ
部材と、少なくとも一層のセラミックスからなる鞘管と
から構成され、雌ねじ部材を鞘管内に装着し、両者を焼
成することにより、鞘管が雌ねじ部材を圧縮して、両者
を密着固定させたものである。In the method for manufacturing a ceramic structure according to claim 1 of the present invention, a female thread member made of a cylindrical ceramic having an uneven portion on the outer circumference and an inner thread portion on the inner circumference, and a sheath made of at least one layer of the ceramic. It is composed of a tube and a female screw member is mounted in the sheath pipe and the both are fired to compress the female screw member by the sheath pipe to tightly fix both.
【００１４】請求項２に係るセラミックス構造体の製造
方法は、セラミックス原料粉末を加圧成形して、外周に
凹凸部を有するとともに内周に雌ねじ部を有する筒状の
雌ねじ部材と、少なくとも一層の鞘管を得、鞘管内に結
合助剤を介して雌ねじ部材を装着し、両者を焼成するこ
とにより、鞘管が雌ねじ部材を圧縮して、両者を密着固
定させるものである。According to a second aspect of the present invention, there is provided a method for producing a ceramic structure, wherein a ceramic raw material powder is pressure-molded to form a cylindrical female screw member having an uneven portion on the outer circumference and a female screw portion on the inner circumference, and at least one layer. A sheath tube is obtained, an internal thread member is mounted in the sheath tube via a bonding aid, and both are fired, so that the sheath tube compresses the internal thread member and tightly fixes them.
【００１５】結合助剤は、雌ねじ部材又は鞘管の材料と
同等成分の材料とするが、特に鞘管と同等の材料とする
ことが望ましい。結合助剤は、鞘管と拡散結合して鞘管
内に凹凸面を形成し、雌ねじ部材の凹凸面と嵌着結合す
るからである。又、雌ねじ部材と鞘管を同種のセラミッ
クス（例えばアルミナセラミックス）で形成する場合、
鞘管の圧縮力を大きくする手段として、鞘管の成形時の
圧力を雌ねじ部材より低くすることにより、焼成時の収
縮率を大きくできる。又は、鞘管の原料粉末の粒径を大
きくすることによっても、焼成時の収縮率を大きくで
き、これらの組み合わせでもよい。又、異種のセラミッ
クスで雌ねじ部材と鞘管を形成する場合には、焼結完了
の温度、収縮率などを考慮して組み合せることが重要で
ある。The binding aid is a material having the same components as the material of the female screw member or the sheath tube, but it is particularly preferable to use the same material as the sheath tube. This is because the binding aid forms a concavo-convex surface inside the sheath tube by diffusion-coupling with the sheath tube, and is fitted and bonded to the concavo-convex surface of the female screw member. When the female screw member and the sheath tube are made of the same type of ceramics (for example, alumina ceramics),
As a means for increasing the compressive force of the sheath tube, the pressure during molding of the sheath tube is set lower than that of the female screw member, whereby the shrinkage rate during firing can be increased. Alternatively, the shrinkage rate during firing can be increased by increasing the particle size of the raw material powder for the sheath tube, and a combination thereof may be used. Further, when forming the female screw member and the sheath pipe with different kinds of ceramics, it is important to combine them in consideration of the temperature of completion of sintering, the shrinkage ratio and the like.
【００１６】請求項３に係るセラミックス構造体の製造
方法は、セラミックス原料粉末を加圧成形して、外周に
凹凸部を有するとともに内周に雌ねじ部を有する筒状の
雌ねじ部材と、少なくとも一層の鞘管を得、鞘管内に結
合助剤を介して雌ねじ部材を装着し、両者を焼成するこ
とにより、まず、雌ねじ部材を焼結させた後に鞘管を焼
結させ、鞘管が雌ねじ部材を圧縮して両者を密着固定さ
せるものである。According to a third aspect of the present invention, there is provided a method of manufacturing a ceramic structure, wherein a ceramic raw material powder is pressure-molded to form a cylindrical female screw member having an uneven portion on the outer circumference and a female screw portion on the inner circumference, and at least one layer. Obtaining the sheath tube, mounting the internal thread member in the sheath tube through the bonding aid, and firing both of them, first, the internal thread member is sintered and then the sheath tube is sintered. It compresses and fixes both closely.
【００１７】結合助剤は、雌ねじ部材又は鞘管の材料と
同等成分の材料とするが、特に鞘管と同等の材料とする
ことが望ましい。結合助剤は、鞘管と拡散結合して鞘管
内に凹凸面を形成し、雌ねじ部材の凹凸面と嵌着結合す
るからである。又、雌ねじ部材と鞘管を同種のセラミッ
クス（例えばアルミナセラミックス）で形成する場合、
鞘管の圧縮力を大きくする手段として、鞘管の成形時の
圧力を雌ねじ部材より低くすることにより、焼成時の収
縮率を大きくできる。又は、鞘管の原料粉末の粒径を大
きくすることによっても、焼成時の収縮率を大きくで
き、これらの組み合わせでもよい。又、異種のセラミッ
クスで雌ねじ部材と鞘管を形成する場合には、焼結完了
の温度、収縮率などを考慮して組み合せることが重要で
ある。The binding aid is a material having the same components as the material of the female screw member or the sheath tube, but it is particularly preferable to use the same material as the sheath tube. This is because the binding aid forms a concavo-convex surface inside the sheath tube by diffusion-coupling with the sheath tube, and is fitted and bonded to the concavo-convex surface of the female screw member. When the female screw member and the sheath tube are made of the same type of ceramics (for example, alumina ceramics),
As a means for increasing the compressive force of the sheath tube, the pressure during molding of the sheath tube is set lower than that of the female screw member, whereby the shrinkage rate during firing can be increased. Alternatively, the shrinkage rate during firing can be increased by increasing the particle size of the raw material powder for the sheath tube, and a combination thereof may be used. Further, when forming the female screw member and the sheath pipe with different kinds of ceramics, it is important to combine them in consideration of the temperature of completion of sintering, the shrinkage ratio and the like.
【００１８】請求項４に係るセラミックス構造体の製造
方法は、セラミックス原料粉末を加圧成形して、外周に
凹凸部を有するとともに内周に雌ねじ部を有する筒状の
雌ねじ部材と、少なくとも一層の鞘管を得、雌ねじ部材
を焼成し、焼結した雌ねじ部材を鞘管内に結合助剤を介
して装着し、鞘管を焼成することにより、鞘管が雌ねじ
部材を圧縮して両者を密着固定させるものである。According to a fourth aspect of the present invention, there is provided a method for producing a ceramic structure, wherein a ceramic raw material powder is pressure-molded to form a cylindrical female screw member having an uneven portion on the outer periphery and a female screw portion on the inner periphery, and at least one layer. Obtaining a sheath tube, firing the female screw member, mounting the sintered female screw member in the sheath pipe through a bonding aid, and firing the sheath pipe, the sheath pipe compresses the female screw member and firmly fixes both. It is what makes me.
【００１９】結合助剤は、雌ねじ部材又は鞘管の材料と
同等成分の材料とするが、特に鞘管と同等の材料とする
ことが望ましい。結合助剤は、鞘管と拡散結合して鞘管
内に凹凸面を形成し、雌ねじ部材の凹凸面と嵌着結合す
るからである。雌ねじ部材は焼結済であることから、同
質の材料であっても、異質の材料であってもよい。The binding aid is a material having the same components as the material of the female screw member or the sheath tube, but it is particularly preferable to use the same material as the sheath tube. This is because the binding aid forms a concavo-convex surface inside the sheath tube by diffusion-coupling with the sheath tube, and is fitted and bonded to the concavo-convex surface of the female screw member. Since the female screw member has been sintered, it may be made of the same material or different materials.
【００２０】請求項５に係るセラミックス構造体の製造
方法は、最外位置の鞘管の外形を円柱状、樽形状、両側
円弧錐状、多角形、外周面凹凸状のいずれかにするもの
である。In the method for manufacturing a ceramic structure according to a fifth aspect of the present invention, the outermost sheath tube has a cylindrical shape, a barrel shape, a double-sided arc pyramid shape, a polygonal shape, or an uneven outer peripheral surface. is there.
【００２１】請求項６に係るセラミックス構造体の製造
方法は、セラミックスを、アルミナ、ジルコニア、炭化
珪素、窒化珪素のいずれかを主成分とするものである。In the method for manufacturing a ceramic structure according to a sixth aspect of the present invention, the ceramic is mainly composed of any one of alumina, zirconia, silicon carbide and silicon nitride.
【００２２】雌ねじ部材と鞘管とを同種のセラミックス
で組み合せるか、異種のセラミックスで組み合せるか
は、必要に応じて行う。Whether to combine the female screw member and the sheath tube with the same kind of ceramics or with different kinds of ceramics is carried out as required.
【００２３】請求項７に係るセラミックス構造体の製造
方法は、鞘管が、隔壁を介して一対の穴を備え、この穴
内に各々雌ねじ部材を装着するものである。In the method of manufacturing a ceramic structure according to a seventh aspect of the present invention, the sheath tube has a pair of holes through the partition wall, and female screw members are mounted in the holes.
【００２４】隔壁は、平面より曲面状が望ましい。コン
クリートパネルの端子体継手やコンクリート内鉄筋の継
手に好適である。雌ねじ部材は、貫通した雌ねじ部を有
する。The partition wall is preferably curved rather than flat. It is suitable for terminal body joints of concrete panels and joints of reinforcing bars in concrete. The female screw member has a penetrating female screw portion.
【００２５】請求項８に係るセラミックス構造体の製造
方法は、鞘管が貫通孔を備え、この貫通孔内に雌ねじ部
材を装着するものである。In the ceramic structure manufacturing method according to the eighth aspect, the sheath tube has a through hole, and the female screw member is mounted in the through hole.
【００２６】雌ねじ部材は、一端が閉塞されているも
の、中間部に隔壁を有するもの、中間部の隔壁が別形成
のもののいずれかである。The female screw member is either one whose one end is closed, one which has a partition wall in the middle portion, or one in which the partition wall in the middle portion is formed separately.
【００２７】[0027]
【発明の実施の形態】実施形態１
以下、発明の実施の形態を図面とともに説明する。図１
は実施形態１によるセラミックス構造体の製造方法の説
明図を示し、アルミナセラミックスの原料粉末を加圧成
形して、外周に螺旋状の凹凸部７ａを有するとともに内
周に貫通した雌ねじ部７ｂを有する筒状の雌ねじ部材７
を形成するとともに、同じくアルミナセラミックスの原
料粉末を加圧成形して、隔壁８ａを介して一対の穴８
ｂ，８ｃを有する外形が樽形状の鞘管８を形成する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 Embodiments of the present invention will be described below with reference to the drawings. Figure 1
FIG. 3 is an explanatory diagram of a method for manufacturing a ceramic structure according to Embodiment 1, in which a raw material powder of alumina ceramics is pressure-molded to have a spiral uneven portion 7a on the outer circumference and a female screw portion 7b penetrating the inner circumference. Cylindrical female screw member 7
In addition, the raw material powder of alumina ceramics is also pressure-molded to form a pair of holes 8 through the partition wall 8a.
An outer shape having b and 8c forms a barrel-shaped sheath tube 8.
【００２８】次に、鞘管８の穴８ｂ，８ｃ内に未焼結又
は焼結済の雌ねじ部材７を結合助剤を介して装着し、両
者又は雌ねじ部材７が焼結済の場合には鞘管８のみを焼
成する。両者が未焼成の場合、雌ねじ部材７と鞘管８と
でアルミナ量を変更することにより、焼結の完了に時間
差が生じる（焼成温度に差が出る。）。例えば、雌ねじ
部材７のアルミナ量を９４重量％、鞘管８のアルミナ量
を９６重量％とすると、焼成温度を昇温する過程におい
て、雌ねじ部材７は例えば１５００℃で焼結して反応が
停止する。又、鞘管８は例えば１６００℃で焼結して反
応を停止する。一方、アルミナセラミックスの焼成時の
線収縮率は１４〜１７％であるが、この縮小率は粒径や
加圧成形圧力によって異なってくる。例えば、加圧成形
圧力を鞘管８より雌ねじ部材７を大きくすれば、焼成時
の縮小率は雌ねじ部材７より鞘管８の方が大きくなる。
従って、焼成時まず雌ねじ部材７が焼結して縮小し、そ
の後鞘管８がより大きな縮小率で焼結する。又、焼結助
剤は鞘管８と拡散結合して鞘管８の穴８ｂ，８ｃ内に凹
凸面を形成し、雌ねじ部材７の凹凸部７ａと嵌着結合す
る。この結果、鞘管８が雌ねじ部材７を加圧圧縮し、両
者は嵌合密着結合し、セラミックス構造体９が形成され
る。このように、両者間に締め付け圧縮力が作用するこ
とにより、セラミックス構造体９の引っ張り強度が向上
する。Next, the unsintered or sintered female screw member 7 is mounted in the holes 8b and 8c of the sheath tube 8 through a coupling aid, and when both or the female screw member 7 is sintered. Only the sheath tube 8 is fired. When both are not fired, by changing the amount of alumina between the female screw member 7 and the sheath tube 8, there is a time difference in the completion of sintering (a firing temperature is different). For example, if the amount of alumina in the internal thread member 7 is 94% by weight and the amount of alumina in the sheath tube 8 is 96% by weight, the internal thread member 7 sinters at 1500 ° C. to stop the reaction in the process of raising the firing temperature. To do. The sheath tube 8 is sintered at 1600 ° C. to stop the reaction. On the other hand, the linear shrinkage rate of the alumina ceramics at the time of firing is 14 to 17%, but this reduction rate varies depending on the particle size and the pressure molding pressure. For example, if the pressure forming pressure of the female screw member 7 is larger than that of the sheath pipe 8, the reduction rate during firing is larger in the sheath pipe 8 than in the female screw member 7.
Therefore, at the time of firing, the internal thread member 7 is first sintered and reduced in size, and then the sheath tube 8 is sintered at a greater reduction rate. Further, the sintering aid is diffusion-bonded to the sheath tube 8 to form an uneven surface in the holes 8b and 8c of the sheath tube 8, and is fitted and bonded to the uneven portion 7a of the female screw member 7. As a result, the sheath tube 8 pressurizes and compresses the female screw member 7, and the two are fitted and tightly coupled to each other to form the ceramic structure 9. Thus, the tensile strength of the ceramic structure 9 is improved by the tightening compression force acting between them.
【００２９】実施形態１においては、隔壁８ａを介して
一対の穴８ｂ，８ｃを有するセラミックス製の鞘管８の
穴８ｂ，８ｃ内にセラミックス製で雌ねじ部７ｂを有し
外周に凹凸部７ａを有する未焼成又は焼成済の雌ねじ部
材７を装着し、焼成することにより、セラミックス構造
体９を形成しており、焼成の際に縮小した鞘管８が雌ね
じ部材７を加圧圧縮することにより両者が嵌合密着結合
し、両者間に締め付け圧縮力が作用することにより、セ
ラミックス構造体９の引っ張り強度が向上する。又、セ
ラミックス構造体９は従来のような金属材料を使用して
いないので、耐腐食性、耐電気腐食性などで課題の多い
部門にも適用することができる。さらに、雌ねじ部材７
と鞘管８を一括焼成する場合には、生産コストの削減に
寄与し、安価なセラミックス構造体９が得られる。又、
雌ねじ部材７の外周に凹凸部７ａを設けたので、雌ねじ
部材７と鞘管８の密着面積が大きく確保され、引っ張り
強度が一層向上する。In the first embodiment, the ceramic sheath tube 8 having the pair of holes 8b and 8c through the partition wall 8a has ceramic female threads 7b in the holes 8b and 8c, and an uneven portion 7a on the outer periphery. The ceramic structure 9 is formed by mounting and firing the unsintered or sintered female screw member 7 that has been produced, and the sheath tube 8 that has been shrunk during firing pressurizes and compresses the female screw member 7. Are fitted and tightly connected to each other, and a tightening compression force acts between them, so that the tensile strength of the ceramic structure 9 is improved. Further, since the ceramic structure 9 does not use a conventional metal material, it can be applied to a department having many problems in corrosion resistance and electric corrosion resistance. Further, the female screw member 7
When the sheath tube 8 and the sheath tube 8 are collectively fired, the production cost can be reduced and an inexpensive ceramic structure 9 can be obtained. or,
Since the concavo-convex portion 7a is provided on the outer circumference of the female screw member 7, a large contact area between the female screw member 7 and the sheath pipe 8 is secured, and the tensile strength is further improved.
【００３０】図２は上記したセラミックス構造体９を用
いた端子体の構造を示し、端子体１０はセラミックス構
造体９とセラミックスからなる筒状のスリーブ体１１と
から主に構成され、その他にセラミックス構造体９の一
端とスリーブ体１１の一端を接続する樹脂製の接続体１
２と、スリーブ体１１の他端に設けられたゴムパッキン
１３を備えている。FIG. 2 shows the structure of a terminal body using the ceramic structure 9 described above. The terminal body 10 is mainly composed of the ceramic structure 9 and a cylindrical sleeve body 11 made of ceramics. A resin connection body 1 for connecting one end of the structure body 9 and one end of the sleeve body 11
2 and a rubber packing 13 provided at the other end of the sleeve body 11.
【００３１】図３は端子体１０を用いたコンクリート型
枠保持装置の構成図を示し、１４はセパレータであり、
その両端は端子体１０のセラミックス構造体９の雌ねじ
部７ｂに螺合され、一端が型枠１５を挿通して端子体１
０のセラミックス構造体９の雌ねじ部７ｂに螺合された
ボルト１６の他端にナット１７を螺合し、これによって
当接体１８及びパイプ１９を介して型枠１５と一体の桟
木２０を端子体１０側に押圧し、型枠１５を端子体１０
のゴムパッキン１３に当接させて固定する。この状態で
型枠１５間にコンクリートを打設し、コンクリートが固
化してコンクリート構造物２１になった後、ナット１
７、当接体１８、パイプ１９、桟木２０及び型枠１５を
除去する。FIG. 3 is a block diagram of a concrete formwork holding device using the terminal body 10, and 14 is a separator,
Both ends thereof are screwed into the female screw portion 7b of the ceramic structure 9 of the terminal body 10, and one end of the terminal body 1 is inserted through the mold 15.
Nut 17 is screwed to the other end of bolt 16 screwed to female screw portion 7b of ceramic structure 9 of No. 0, thereby connecting pier 20 integrated with formwork 15 via contact body 18 and pipe 19 to a terminal. It is pressed to the side of the body 10 and the mold 15 is pushed to the terminal body 10.
The rubber packing 13 is brought into contact with and fixed. In this state, concrete is placed between the molds 15, and after the concrete is solidified to form the concrete structure 21, the nut 1
7, the contact body 18, the pipe 19, the splint 20, and the form 15 are removed.
【００３２】その後、ゴムパッキン１３も除去する。ゴ
ムパッキン１３はコンクリート打設時にコンクリートが
端子体１０内に侵入するのを防止するなどのために設け
てあり、スリーブ体１１の一端に一成分形の瞬間接着剤
により貼着される。瞬間接着剤としては例えばシアノア
クリレート系のものが用いられ、具体的にはアロンアル
ファ（東亜合成株式会社製）、セメダイン３０００シリ
ーズ（セメダイン株式会社製）などが用いられる。瞬間
接着剤は、接着作業を迅速に行うことができ、除去する
際にも剥離を容易に行うことができる利点がある。ただ
し、スリーブ体１１が上記したようにセラミックス製あ
るいはモルタル製の場合には、接着剤はゼリー状である
必要がある。接着剤が液状であると、塗布したものがス
リーブ体１１内にしみこみ、拡散して接着層を形成でき
ないからである。After that, the rubber packing 13 is also removed. The rubber packing 13 is provided to prevent concrete from entering the terminal body 10 when pouring concrete, and is attached to one end of the sleeve body 11 with a one-component instant adhesive. As the instant adhesive, for example, a cyanoacrylate-based adhesive is used, and specifically, Aron Alpha (manufactured by Toagosei Co., Ltd.), Cemedine 3000 series (manufactured by Cemedine Co., Ltd.) and the like are used. The instant adhesive has an advantage that the bonding work can be performed quickly and the peeling can be easily performed even when the adhesive is removed. However, when the sleeve body 11 is made of ceramics or mortar as described above, the adhesive needs to be jelly-like. This is because when the adhesive is in a liquid state, the applied substance soaks into the sleeve body 11 and diffuses to form an adhesive layer.
【００３３】スリーブ体１１はかぶり寸法を確保するた
めに設けてあり、セラミックス（アルミナ、ムライトな
ど）、コンクリート、モルタルなどの無機質体により形
成される。又スリーブ体１１とセラミックス構造物９と
の接続は、接続体１２を介して接続し、または接着剤に
より接着する。セラミックス構造体９とスリーブ体１１
を接着剤により接着する場合には、接着剤として常温硬
化形のエポキシ樹脂を使用した。例えば、エポキシ樹脂
系二液形の接着剤であり、主成分のエポキシ樹脂（ビス
フェノールＡ型エポキシ樹脂中間体）と充填剤、染料と
からなる主剤と、主成分のポリチオールと充填剤とから
なる硬化剤の二液から構成される。具体的には商品各Ｅ
Ｐ−３３０（セメダイン株式会社製）を使用した。この
場合、主剤と硬化剤の二液を５０：５０で混合し、塗布
後スリーブ体１１とセラミックス構造体９と合わせて静
止状態とし、自然硬化により接合した。The sleeve body 11 is provided in order to secure a cover size, and is made of an inorganic material such as ceramics (alumina, mullite, etc.), concrete, mortar and the like. Further, the sleeve body 11 and the ceramic structure 9 are connected to each other via the connection body 12 or are bonded by an adhesive. Ceramic structure 9 and sleeve body 11
In the case of bonding with an adhesive, a room temperature curing type epoxy resin was used as the adhesive. For example, it is an epoxy resin-based two-component type adhesive, which is a main component composed of an epoxy resin (bisphenol A type epoxy resin intermediate) as a main component, a filler, and a dye, and a curing component composed of polythiol and a filler as the main components. Composed of two parts of the agent. Specifically, each product E
P-330 (made by Cemedine Co., Ltd.) was used. In this case, the two liquids of the main agent and the curing agent were mixed at 50:50, and after coating, the sleeve body 11 and the ceramic structure 9 were put in a stationary state and joined by natural curing.
【００３４】図３に示したコンクリート型枠保持装置に
おいては、雌ねじ体としてセラミックス構造体９を用い
ており、セラミックス構造体９はすべてセラミックスか
らなり、金属製ではないので腐食の心配がなく、またセ
ラミックス構造体９は隔壁８ａを介して一対の雌ねじ部
７ｂを有しており、内部のセパレータ１４が外部に露出
しないので、両水の浸入によるセパレータ１４の腐食の
発生もない。従って、端子体１０で腐食が発生すること
はなく、コンクリート構造物２１の表面部にクラックが
発生するなどの劣化現象はなく、コンクリート構造物２
１の耐久性は損われず、耐久性の高いコンクリート構造
物２１が得られる。
実施形態２
図４（ａ），（ｂ）は実施形態２によるセラミックス構
造体の焼成前の断面図及び雌ねじ部材の断面図を示し、
鞘管２２はセラミックスにより外形が樽形状に形成さ
れ、中心には貫通した孔２２ａが設けられる。雌ねじ部
材２３はセラミックスにより筒状に形成され、外周に凹
凸部２３ａが形成されるとともに内周に一端が閉塞され
た雌ねじ部２３ｂが形成される。鞘管２２の貫通孔２２
ａ内に結合助剤を介して一対の焼成済の雌ねじ部材２３
を閉塞端側を合せてセットし、図４（ａ）の状態とし、
鞘管２２を焼成すると、鞘管２２が縮小して実施形態１
と同様に鞘管２２の貫通孔２２ａの内面に凹凸面が形成
され、鞘管２２と雌ねじ部材２３は凹凸面で嵌合密着結
合し、セラミックス構造体が形成される。このとき、鞘
管２２と雌ねじ部材２３との間に締め付け圧縮力が作用
し、セラミックス構造体の引っ張り強度が向上する。
実施形態３
図５（ａ），（ｂ）は実施形態３によるセラミックス構
造体の焼成前の断面図及び雌ねじ部材の断面図を示し、
雌ねじ部材２４はセラミックスにより筒状に形成され、
外周に凹凸部２４ａが形成されるとともに、内周に隔壁
２４ｂを介して一対の雌ねじ部２４ｃ，２４ｄが形成さ
れる。鞘管２２の貫通孔２２ａ内に結合助剤を介して焼
成済の雌ねじ部材２４をセットし、図５（ａ）の状態と
し、鞘管２２を焼成すると、鞘管２２が縮小して鞘管２
２と雌ねじ部材２４が凹凸面で嵌合密着結合し、引っ張
り強度が強いセラミックス構造体が形成される。
実施形態４
図６（ａ），（ｂ）は実施形態４によるセラミックス構
造体の焼成前の断面図と雌ねじ部材及び隔壁の断面図を
示し、焼成済の一対の雌ねじ部材７とその間に介在させ
た未焼成のセラミックス製の隔壁２５を鞘管２２の貫通
孔２２ａ内に結合助剤を介してセットし、図６（ａ）の
状態とし、これらを焼成する。鞘管２２が縮小し、鞘管
２２と雌ねじ部材７とが凹凸面で嵌合密着結合し、引っ
張り強度が強いセラミックス構造体が形成される。
実施形態５
図７（ａ），（ｂ）は実施形態５によるセラミックス構
造体の焼成前の断面図と雌ねじ部材の断面図及び隔壁の
正面図を示し、焼成済の一対の雌ねじ部材７とその間に
介在させた未焼成のセラミックス製の隔壁２６を鞘管２
２の貫通孔２２ａ内に結合助剤を介してセットし、図７
（ａ）の状態とし、これらを焼成する。鞘管２２が縮小
し、鞘管２２と雌ねじ部材７とが凹凸面で嵌合密着結合
し、引っ張り強度が強いセラミックス構造体が形成され
る。隔壁２６は両側に凸部２６ａを有し、凸部２６ａは
雌ねじ部材７の雌ねじ部７ａと係合し、一対の雌ねじ部
材７と隔壁２６の芯を揃えるようにするために設けてあ
る。
実施形態６
図８（ａ）は実施形態６によるセラミックス構造体の横
断面図を示し、上記実施形態においては図８（ｂ）に示
すように一層からなる鞘管８が縮小することにより雌ね
じ部材７を圧縮していたが、実施形態６においては鞘管
８の外側にさらに樽形状の鞘管２７を設け、焼成時セラ
ミックスからなる鞘管２７により鞘管８を圧縮し、鞘管
８により雌ねじ部材７を圧縮してセラミックス構造体２
８を形成している。In the concrete form holding device shown in FIG. 3, the ceramic structure 9 is used as the female screw body. Since the ceramic structure 9 is entirely made of ceramics and is not made of metal, there is no fear of corrosion, and The ceramic structure 9 has a pair of female screw portions 7b via the partition wall 8a, and since the internal separator 14 is not exposed to the outside, corrosion of the separator 14 due to the intrusion of both waters does not occur. Therefore, the terminal body 10 is not corroded, and there is no deterioration phenomenon such as cracks on the surface of the concrete structure 21.
The durability of No. 1 is not impaired, and the concrete structure 21 having high durability is obtained. Embodiment 2 FIGS. 4A and 4B are sectional views of a ceramic structure according to Embodiment 2 before firing and a female screw member.
The outer shape of the sheath tube 22 is formed into a barrel shape with ceramics, and a through hole 22a is provided in the center. The female screw member 23 is made of ceramics in a cylindrical shape, and an uneven portion 23a is formed on the outer circumference and a female screw portion 23b with one end closed is formed on the inner circumference. Through hole 22 of sheath tube 22
a pair of baked female screw members 23 through a bonding aid in a.
Set the closed end side together to bring it to the state of FIG. 4 (a),
When the sheath tube 22 is fired, the sheath tube 22 shrinks and the first embodiment
Similarly, a concavo-convex surface is formed on the inner surface of the through hole 22a of the sheath tube 22, and the sheath tube 22 and the female screw member 23 are fitted and tightly coupled to each other at the concavo-convex surface to form a ceramic structure. At this time, a tightening compression force acts between the sheath tube 22 and the female screw member 23, and the tensile strength of the ceramic structure is improved. Embodiment 3 FIGS. 5 (a) and 5 (b) are sectional views of a ceramic structure according to Embodiment 3 before firing and a female screw member.
The female screw member 24 is made of ceramics in a cylindrical shape,
The uneven portion 24a is formed on the outer circumference, and the pair of female screw portions 24c, 24d is formed on the inner circumference via the partition wall 24b. When the fired female screw member 24 is set in the through-hole 22a of the sheath tube 22 via a binding aid and brought into the state of FIG. 5 (a) and the sheath tube 22 is fired, the sheath tube 22 shrinks and the sheath tube 22 is shrunk. Two
2 and the female screw member 24 are fitted and tightly bonded to each other on the uneven surface, so that a ceramic structure having high tensile strength is formed. Embodiment 4 FIGS. 6 (a) and 6 (b) show a sectional view of a ceramic structure according to Embodiment 4 before firing, and a sectional view of a female screw member and a partition wall, and a pair of fired female screw members 7 and an intervening member therebetween. The unfired ceramic partition wall 25 is set in the through hole 22a of the sheath tube 22 through a bonding aid to obtain the state of FIG. 6A, and these are fired. The sheath tube 22 is reduced in size, and the sheath tube 22 and the female screw member 7 are fitted and tightly coupled to each other on the uneven surface, so that a ceramic structure having high tensile strength is formed. Embodiment 5 FIGS. 7 (a) and 7 (b) show a sectional view of a ceramic structure according to Embodiment 5 before firing, a sectional view of a female screw member and a front view of a partition wall. The unfired ceramic partition wall 26 interposed in the sheath tube 2
2 is set in the through-hole 22a of FIG.
In the state of (a), these are fired. The sheath tube 22 is reduced in size, and the sheath tube 22 and the female screw member 7 are fitted and tightly coupled to each other on the uneven surface, so that a ceramic structure having high tensile strength is formed. The partition wall 26 has convex portions 26a on both sides, and the convex portion 26a is provided for engaging the female screw portion 7a of the female screw member 7 and aligning the cores of the pair of female screw members 7 with the partition wall 26. Sixth Embodiment FIG. 8 (a) is a cross-sectional view of a ceramic structure according to a sixth embodiment. In the above-described embodiment, as shown in FIG. 7 is compressed, in the sixth embodiment, a barrel-shaped sheath pipe 27 is further provided on the outside of the sheath pipe 8, and the sheath pipe 8 made of ceramics is compressed during firing to compress the sheath pipe 8, and the sheath pipe 8 forms an internal thread. The ceramic structure 2 by compressing the member 7
8 forming.
【００３５】実施形態６においては、上記したように、
二層の鞘管８，２７によって雌ねじ部材７を圧縮するこ
とによりセラミックス構造体２８を形成しており、セラ
ミックス構造体２８の引っ張り強度を高めることができ
るとともに、せん断強度を高めることができる。なお、
三層以上の鞘管によって雌ねじ部材を圧縮するようにす
れば、さらにこれらの強度を高めることができる。In the sixth embodiment, as described above,
By compressing the female screw member 7 by the two-layered sheath tubes 8 and 27, the ceramic structure 28 is formed, so that the tensile strength of the ceramic structure 28 and the shear strength can be increased. In addition,
By compressing the female screw member with three or more layers of sheath tubes, these strengths can be further increased.
【００３６】なお、上記各実施形態においては、最外位
置の鞘管の外形を樽形状としたが、円柱状、両側円弧錐
状、多角形、外周面凹凸状などとしてもよい。又、鞘
管、雌ねじ部材（別体の隔壁を含む。）をアルミナセラ
ミックスにより形成したが、ジルコニア、炭化珪素、窒
化珪素などのセラミックスにより形成してもよい。In each of the above-mentioned embodiments, the outermost sheath tube has a barrel shape, but it may have a cylindrical shape, a double-sided arc pyramid shape, a polygonal shape, an outer peripheral surface uneven shape, or the like. Further, although the sheath tube and the female screw member (including a separate partition wall) are made of alumina ceramics, they may be made of ceramics such as zirconia, silicon carbide and silicon nitride.
【００３７】[0037]
【実施例】Ａ．未焼成の雌ねじ部材と未焼成の鞘管によ
る場合
（１）雌ねじ部材７の製造方法
まず、主成分となる酸化アルミニウム原料（粒径１μｍ
以下、純度９９．８％、含有量９４重量％）に焼結を助
けるための副成分（焼結助材、残りの成分）を添加し、
さらに純水を加え、ボールミルにより１０時間混合破砕
を行う。得られた原料スラリーにポリビニールアルコー
ルなどの有機バインダーと分散剤としてのポリカルボン
酸アンモニウム塩を添加し、スプレードライヤーで１５
０℃の温度で乾燥し、噴霧造粒する。得られた顆粒を静
水圧成形機（通称ＣＩＰ）により５ＭＰａの圧力で成形
する。
（２）鞘管８の製造方法
まず、主成分となる酸化アルミニウム原料（粒径１μｍ
以下、純度９９．８％、含有量９６重量％）に焼結を助
けるための副成分（焼結助材、残りの成分）を添加し、
さらに純水を加え、ボールミルにより１０時間混合破砕
を行う。得られた原料スラリーにポリビニールアルコー
ルなどの有機バインダーと分散剤としてのポリカルボン
酸アンモニウム塩を添加し、スプレードライヤーで１５
０℃の温度で乾燥し、噴霧造粒する。得られた顆粒を静
水圧成形機により４．５ＭＰａの圧力で成形する。
（３）セラミックス構造体９の製造方法
鞘管８の穴８ｂ，８ｃ内に結合助剤（鞘管８と同成分の
アルミナ）を介して雌ねじ部材７をセットし、ガス炉に
より１６００℃で２時間焼成し、１００℃／時間の降温
速度で冷却し、セラミックス焼結体からなるセラミック
ス構造体９を得る。セラミックス構造体９の焼成におい
ては、雌ねじ部材７のアルミナ量を９４重量％とするこ
とにより、約１５００℃で焼結が完了する。一方、鞘管
８はアルミナ量を９６重量％とすることにより、約１６
００℃で焼結が完了し、しかも加圧成形圧力を雌ねじ部
材７の５ＭＰａに対してこれより低い４．５ＭＰａとす
ることにより収縮率を大きくすることができ、雌ねじ部
材７を鞘管８により締め付け圧縮することができる。
Ｂ．焼成済の雌ねじ部材と未焼成の鞘管による場合
アルミナ量と温度が異る。
（１）雌ねじ部材７の製造方法
まず、主成分となる酸化アルミニウム原料（粒径１μｍ
以下、純度９９．８％、含有量９６重量％）に焼結を助
けるための副成分（焼結助材、残りの成分）を添加し、
さらに純水を加え、ボールミルにより１０時間混合破砕
を行う。得られた原料スラリーにポリビニールアルコー
ルなどの有機バインダーと分散剤としてのポリカルボン
酸アンモニウム塩を添加し、スプレードライヤーで１５
０℃の温度で乾燥し、噴霧造粒する。得られた顆粒を静
水圧成形機（通称ＣＩＰ）により５ＭＰａの圧力で成形
する。成形後ガス炉により１６００℃で２時間焼成し、
１００℃／時間の降温速度で冷却してセラミックス焼結
体の雌ねじ部材７を得る。
（２）鞘管８の製造方法
まず、主成分となる酸化アルミニウム原料（粒径１μｍ
以下、純度９９．８％、含有量９４重量％）に焼結を助
けるための副成分（焼結助材、残りの成分）を添加し、
さらに純水を加え、ボールミルにより１０時間混合破砕
を行う。得られた原料スラリーにポリビニールアルコー
ルなどの有機バインダーと分散剤としてのポリカルボン
酸アンモニウム塩を添加し、スプレードライヤーで１５
０℃の温度で乾燥し、噴霧造粒する。得られた顆粒を静
水圧成形機により５ＭＰａの圧力で成形する。
（３）セラミックス構造体９の製造方法
鞘管８の穴８ｂ，８ｃ内に結合助剤を介して焼成済の雌
ねじ部材７をセットし、ガス炉により１５００℃で２時
間焼成し、１００℃／時間の降温速度で冷却してセラミ
ックス焼結体からなるセラミックス構造体９を得る。雌
ねじ部材７は二度焼きとなるので、鞘管８の焼成温度を
若干低くしたほうがよい。雌ねじ部材７のアルミナ量を
９６重量％として焼成温度を１６００℃とし、鞘管８の
アルミナ量を９４重量％とし、焼成温度を１５００℃と
し、アルミナ量を少なくすることで低い温度で焼成す
る。
（４）成分について（各部材共通、以下同じ）
主成分の酸化アルミニウムの含有量は約９０〜９８重量
％とする。９０重量％以下の場合には、接続継手として
の強度が不足し、特に内部のねじ山が破損する。９８重
量％以上の場合には、焼結温度を高くする必要があり、
経済的に好ましくない。焼結助材としては、ＭｇＯ，Ｓ
ｉＯ2，ＣａＯが好ましく、焼成温度を低下させる効果
がある。
（５）粒径について
噴霧造粒された顆粒は、その粒径が約３０〜２００μｍ
の範囲に分布する粒子が８０％以上占めるものが好まし
い。この範囲を下回る場合（小径）には、流動性が悪化
して成形型への充填が困難となり、空洞が発生する。こ
の範囲を上回る場合（大径）には、ねじ山の形成が確実
に行われない。いずれにしても、所望の端子体を得るこ
とが困難である。
（６）圧力について
成形圧力は、３〜１０ＭＰａの範囲であればよい。これ
以下では、圧力不足により欠けやクラックを発生する。
これ以上では、圧力解除までの時間がかかり、生産性が
低下し、しかも離型性が悪く、型割れが発生しやすくな
る。
（７）焼成条件について
雰囲気は大気中でもよい。焼成保持温度は１５００〜１
７００℃、焼成時間は２時間、降温速度は、焼成保持温
度から４００℃までを５０〜２００℃／時間の冷却速度
で行えばよい。理由は、９０重量％以上の酸化アルミニ
ウムと焼結助材（ＭｇＯ，ＳｉＯ2，ＣａＯ）を含む組
成では、約１５００〜１７００℃で焼結しないと焼結が
完了せず、また５０〜２００℃／時間の降温速度でない
と焼成後の強度が低下して好ましくないからである。EXAMPLES A. In the case of using an unsintered internal thread member and an unsintered sheath tube (1) Manufacturing method of the internal thread member 7 First, the aluminum oxide raw material (particle size 1 μm) as the main component.
Hereinafter, a secondary component (sintering aid, remaining component) for assisting sintering is added to a purity of 99.8% and a content of 94% by weight,
Further, pure water is added and mixed and crushed by a ball mill for 10 hours. To the obtained raw material slurry, an organic binder such as polyvinyl alcohol and a polycarboxylic acid ammonium salt as a dispersant were added, and the mixture was sprayed with a drier 15
Dry at a temperature of 0 ° C. and spray granulate. The obtained granules are molded at a pressure of 5 MPa with an isostatic press (commonly called CIP). (2) Method for manufacturing sheath tube 8 First, the aluminum oxide raw material (particle size: 1 μm) as the main component.
Hereinafter, a secondary component (sintering aid, remaining components) for assisting sintering is added to a purity of 99.8% and a content of 96% by weight,
Further, pure water is added and mixed and crushed by a ball mill for 10 hours. To the obtained raw material slurry, an organic binder such as polyvinyl alcohol and a polycarboxylic acid ammonium salt as a dispersant were added, and the mixture was sprayed with a drier 15
Dry at a temperature of 0 ° C. and spray granulate. The obtained granules are molded with a hydrostatic molding machine at a pressure of 4.5 MPa. (3) Method for manufacturing ceramic structure 9 The female screw member 7 is set in the holes 8b and 8c of the sheath tube 8 via a coupling aid (alumina having the same composition as the sheath tube 8), and the temperature is set to 2 at 1600 ° C by a gas furnace. Firing is performed for an hour and cooling is performed at a temperature lowering rate of 100 ° C./hour to obtain a ceramic structure 9 made of a ceramic sintered body. When firing the ceramic structure 9, the sintering is completed at about 1500 ° C. by setting the amount of alumina of the female screw member 7 to 94% by weight. On the other hand, the sheath tube 8 has an alumina content of 96% by weight, and
When the sintering is completed at 00 ° C. and the pressure forming pressure is 4.5 MPa lower than 5 MPa of the internal thread member 7, the shrinkage rate can be increased, and the internal thread member 7 is formed by the sheath tube 8. Can be tightened and compressed. B. In the case of using a female screw member that has been fired and a sheath pipe that is not fired, the amount of alumina and the temperature are different. (1) Method for manufacturing female screw member 7 First, the aluminum oxide raw material (particle size: 1 μm) as the main component.
Hereinafter, a secondary component (sintering aid, remaining components) for assisting sintering is added to a purity of 99.8% and a content of 96% by weight,
Further, pure water is added and mixed and crushed by a ball mill for 10 hours. To the obtained raw material slurry, an organic binder such as polyvinyl alcohol and a polycarboxylic acid ammonium salt as a dispersant were added, and the mixture was sprayed with a drier 15
Dry at a temperature of 0 ° C. and spray granulate. The obtained granules are molded at a pressure of 5 MPa with an isostatic press (commonly called CIP). After molding, fire in a gas furnace at 1600 ° C for 2 hours,
The internal thread member 7 of a ceramics sintered body is obtained by cooling at a temperature lowering rate of 100 ° C./hour. (2) Method for manufacturing sheath tube 8 First, the aluminum oxide raw material (particle size: 1 μm) as the main component.
Hereinafter, a secondary component (sintering aid, remaining component) for assisting sintering is added to a purity of 99.8% and a content of 94% by weight,
Further, pure water is added and mixed and crushed by a ball mill for 10 hours. To the obtained raw material slurry, an organic binder such as polyvinyl alcohol and a polycarboxylic acid ammonium salt as a dispersant were added, and the mixture was sprayed with a drier 15
Dry at a temperature of 0 ° C. and spray granulate. The obtained granules are molded with a hydrostatic molding machine at a pressure of 5 MPa. (3) Method for manufacturing ceramic structure 9 The female screw member 7 that has been fired is set in the holes 8b and 8c of the sheath tube 8 through the bonding aid, and fired at 1500 ° C for 2 hours in a gas furnace to obtain 100 ° C / The ceramic structure 9 made of a ceramic sintered body is obtained by cooling at a temperature decreasing rate of time. Since the female screw member 7 is fired twice, it is better to slightly lower the firing temperature of the sheath tube 8. The amount of alumina of the female screw member 7 is 96% by weight, the firing temperature is 1600 ° C., the amount of alumina of the sheath tube 8 is 94% by weight, the firing temperature is 1500 ° C., and the amount of alumina is reduced to perform firing at a low temperature. Component (4) (Common to all members, the same applies hereinafter) The content of aluminum oxide as a main component is about 90 to 98% by weight. When it is 90% by weight or less, the strength as a connection joint is insufficient, and especially the internal thread is damaged. If it is more than 98% by weight, it is necessary to raise the sintering temperature,
Not economically favorable. As a sintering aid, MgO, S
iO 2 and CaO are preferable and they have the effect of lowering the firing temperature. (5) Particle size The granules spray-granulated have a particle size of about 30 to 200 μm.
It is preferable that the particles distributed in the above range occupy 80% or more. If it is less than this range (small diameter), the fluidity deteriorates and it becomes difficult to fill the molding die, resulting in cavities. If it exceeds this range (large diameter), the thread is not reliably formed. In any case, it is difficult to obtain a desired terminal body. (6) Pressure The molding pressure may be in the range of 3 to 10 MPa. Below this, cracks and cracks occur due to insufficient pressure.
If it is higher than this, it takes time to release the pressure, productivity is lowered, mold release property is poor, and mold cracking is likely to occur. (7) About firing conditions The atmosphere may be in the air. Baking holding temperature is 1500-1
The temperature may be 700 ° C., the firing time may be 2 hours, and the temperature lowering rate may be from the firing holding temperature to 400 ° C. at a cooling rate of 50 to 200 ° C./hour. The reason is that with a composition containing 90% by weight or more of aluminum oxide and a sintering aid (MgO, SiO 2 , CaO), the sintering cannot be completed unless it is sintered at about 1500 to 1700 ° C., and 50 to 200 ° C. This is because the strength after firing is reduced unless the temperature lowering rate is / hour, which is not preferable.
【００３８】[0038]
【発明の効果】以上のように、この発明によれば、セラ
ミックスからなるの雌ねじ部材をセラミックスからなる
鞘管によりその焼成時の収縮力を利用して圧縮し、セラ
ミックス構造体を形成しており、雌ねじ部材には圧縮力
が作用し、しかも雌ねじ部材と鞘管との間には密着面が
存在することから、セラミックス構造体の引っ張り強度
を著しく向上することができる。又、セラミックス構造
体は腐食しないので、耐食性、耐電気絶縁性などが要求
される各種用途に適用され、例えばコンクリート構造物
内に埋設した場合には、耐久性が高いコンクリート構造
物が得られる。さらに、雌ねじ部材と鞘管を一括焼成し
た場合には、生産コストの削減に寄与し、安価なセラミ
ックス構造体が得られる。又、雌ねじ部材の外周に凹凸
部を設けたので、雌ねじ部材と鞘管の密着面積が大きく
確保され、引っ張り強度が一層向上する。As described above, according to the present invention, the female screw member made of ceramics is compressed by the sheath tube made of ceramics by utilizing the contracting force at the time of firing to form the ceramics structure. A compressive force acts on the female screw member, and since there is a close contact surface between the female screw member and the sheath pipe, the tensile strength of the ceramic structure can be remarkably improved. Further, since the ceramic structure does not corrode, it is applied to various applications in which corrosion resistance, electrical insulation resistance, etc. are required. For example, when embedded in a concrete structure, a concrete structure having high durability can be obtained. Furthermore, when the female screw member and the sheath tube are fired together, the production cost can be reduced, and an inexpensive ceramic structure can be obtained. Further, since the uneven portion is provided on the outer periphery of the female screw member, a large contact area between the female screw member and the sheath pipe is secured, and the tensile strength is further improved.
【図１】この発明の実施形態１によるセラミックス構造
体の製造方法の説明図である。FIG. 1 is an explanatory diagram of a method for manufacturing a ceramic structure according to a first embodiment of the present invention.
【図２】実施形態１によるセラミックス構造体を用いた
端子体の構成図である。FIG. 2 is a configuration diagram of a terminal body using the ceramic structure according to the first embodiment.
【図３】実施形態１によるセラミックス構造体を用いた
コンクリート型枠保持装置の構成図である。FIG. 3 is a configuration diagram of a concrete form holding device using the ceramic structure according to the first embodiment.
【図４】実施形態２によるセラミックス構造体の焼成前
の断面図及び雌ねじ部材の断面図である。FIG. 4 is a cross-sectional view of a ceramic structure according to a second embodiment before firing and a cross-sectional view of a female screw member.
【図５】実施形態３によるセラミックス構造体の焼成前
の断面図及び雌ねじ部材の断面図である。5A and 5B are a sectional view of a ceramic structure according to a third embodiment before firing and a sectional view of a female screw member.
【図６】実施形態４によるセラミックス構造体の焼成前
の断面図と雌ねじ部材の断面図及び隔壁の断面図であ
る。6A and 6B are a cross-sectional view of a ceramic structure according to Embodiment 4 before firing, a cross-sectional view of a female screw member, and a cross-sectional view of a partition wall.
【図７】実施形態５によるセラミックス構造体の焼成前
の断面図と雌ねじ部材の断面図及び隔壁の正面図であ
る。7A and 7B are a cross-sectional view of a ceramic structure according to a fifth embodiment before firing, a cross-sectional view of a female screw member, and a front view of a partition wall.
【図８】実施形態６によるセラミックス構造体の横断面
図及び他の実施形態によるセラミックス構造体の横断面
図である。FIG. 8 is a cross-sectional view of a ceramic structure according to a sixth embodiment and a cross-sectional view of a ceramic structure according to another embodiment.
【図９】従来の雌ねじ体の断面図及びその引っ張り強度
試験の説明図である。FIG. 9 is a cross-sectional view of a conventional female screw body and an explanatory diagram of its tensile strength test.
【図１０】従来の雌ねじ体の寸法を示す図である。FIG. 10 is a diagram showing dimensions of a conventional female screw body.
【図１１】本発明者らが考案したセラミックス構造体の
製造方法の説明図である。FIG. 11 is an explanatory diagram of a method for manufacturing a ceramic structure devised by the present inventors.
【図１２】本発明者らが考案したセラミックス構造体の
引っ張り強度試験の説明図である。FIG. 12 is an explanatory diagram of a tensile strength test of a ceramic structure devised by the present inventors.
【図１３】本発明者らが考案したセラミックス構造体の
鞘管の焼成前後の寸法及び焼成後の雌ねじ部材の寸法を
示す図である。FIG. 13 is a diagram showing dimensions before and after firing of the sheath tube of the ceramic structure devised by the present inventors and dimensions of the female screw member after firing.
７，２３，２４…雌ねじ部材 ７ａ，２３ａ，２４ａ…凹凸部 ７ｂ，２３ｂ，２４ｃ，２４ｄ…雌ねじ部 ８，２２，２７…鞘管 ８ａ，２４ａ，２５，２６…隔壁 ８ｂ，８ｃ…穴 ９，２８…セラミックス構造体 ２２ａ…貫通孔 7, 23, 24 ... Female screw member 7a, 23a, 24a ... Uneven portion 7b, 23b, 24c, 24d ... Female screw portion 8, 22, 27 ... Sheath tube 8a, 24a, 25, 26 ... Partition walls 8b, 8c ... holes 9, 28 ... Ceramic structure 22a ... through hole
───────────────────────────────────────────────────── フロントページの続き (72)発明者 飯田 憲 静岡県沼津市東間門字上中溝515番地 明 電セラミックス株式会社内 Ｆターム(参考） 2E177 KD03 4G026 BA03 BA05 BA14 BA17 BB03 BB05 BB14 BB17 BC01 BD11 BF04 BF06 BF07 BF57 BG05 BG08 BH01 4G055 AA08 BA01 BA22 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Ken Iida 515 Kaminakamizo, Azuma Gate, Numazu City, Shizuoka Prefecture Electroceramics Co., Ltd. F-term (reference) 2E177 KD03 4G026 BA03 BA05 BA14 BA17 BB03 BB05 BB14 BB17 BC01 BD11 BF04 BF06 BF07 BF57 BG05 BG08 BH01 4G055 AA08 BA01 BA22
Claims (8)
ねじ部を有する筒状のセラミックスからなる雌ねじ部材
と、少なくとも一層のセラミックスからなる鞘管とから
構成され、雌ねじ部材を鞘管内に装着し、両者を焼成す
ることにより、鞘管が雌ねじ部材を圧縮して、両者を密
着固定させたことを特徴とするセラミックス構造体。1. A female screw member made of a cylindrical ceramic having an uneven portion on the outer circumference and a female screw portion on the inner circumference, and a sheath pipe made of at least one layer of ceramics. The female screw member is mounted in the sheath pipe. The ceramic structure is characterized in that the sheath tube compresses the female screw member by firing both of them, so that they are closely fixed.
外周に凹凸部を有するとともに内周に雌ねじ部を有する
筒状の雌ねじ部材と、少なくとも一層の鞘管を得、鞘管
内に結合助剤を介して雌ねじ部材を装着し、両者を焼成
することにより、鞘管が雌ねじ部材を圧縮して、両者を
密着固定させることを特徴とするセラミックス構造体の
製造方法。2. A ceramic raw material powder is pressure-molded,
By obtaining a cylindrical female screw member having an uneven portion on the outer periphery and an inner screw portion on the inner periphery, and at least one layer of a sheath pipe, mounting the female screw member in the sheath pipe via a coupling aid, and firing both. A method for manufacturing a ceramic structure, wherein the sheath tube compresses the female screw member to tightly fix them.
外周に凹凸部を有するとともに内周に雌ねじ部を有する
筒状の雌ねじ部材と、少なくとも一層の鞘管を得、鞘管
内に結合助剤を介して雌ねじ部材を装着し、両者を焼成
することにより、まず、雌ねじ部材を焼結させた後に鞘
管を焼結させ、鞘管が雌ねじ部材を圧縮して両者を密着
固定させることを特徴とするセラミックス構造体の製造
方法。3. A ceramic raw material powder is pressure-molded,
By obtaining a cylindrical female screw member having an uneven portion on the outer periphery and an inner screw portion on the inner periphery, and at least one layer of a sheath pipe, mounting the female screw member in the sheath pipe via a coupling aid, and firing both. First, a method for producing a ceramic structure, comprising first sintering an internal thread member and then sintering the sheath tube, and compressing the internal thread member by the sheath tube to closely fix the both.
外周に凹凸部を有するとともに内周に雌ねじ部を有する
筒状の雌ねじ部材と、少なくとも一層の鞘管を得、雌ね
じ部材を焼成し、焼結した雌ねじ部材を鞘管内に結合助
剤を介して装着し、鞘管を焼成することにより、鞘管が
雌ねじ部材を圧縮して両者を密着固定させることを特徴
とするセラミックス構造体の製造方法。4. A ceramic raw material powder is pressure-molded,
A tubular female screw member having a female screw portion on the inner periphery and a concavo-convex portion on the outer periphery and at least one layer of a sheath pipe are obtained, the female screw member is fired, and the sintered female screw member is inserted into the sheath pipe through a coupling aid. A method for manufacturing a ceramic structure, characterized in that the sheath tube compresses the female screw member to tightly fix the two by mounting and firing the sheath tube.
状、両側円弧錐状、多角形、外周面凹凸状のいずれかに
することを特徴とする請求項１〜４のいずれかに記載の
セラミックス構造体の製造方法。5. The outermost sheath tube has an outer shape of any of a columnar shape, a barrel shape, a both-sided arc pyramid shape, a polygonal shape, and an outer peripheral surface concavo-convex shape. A method for producing a ceramic structure according to claim 1.
ア、炭化珪素、窒化珪素のいずれかを主成分とすること
を特徴とする請求項１〜５のいずれかに記載のセラミッ
クス構造体の製造方法。6. The method for producing a ceramic structure according to claim 1, wherein the ceramic contains alumina, zirconia, silicon carbide or silicon nitride as a main component.
この穴内に各々雌ねじ部材を装着することを特徴とする
請求項１〜６のいずれかに記載のセラミックス構造体の
製造方法。7. The sheath tube comprises a pair of holes through a partition wall,
A method for manufacturing a ceramic structure according to any one of claims 1 to 6, wherein female screw members are mounted in the holes.
雌ねじ部材を装着することを特徴とする請求項１〜６の
いずれかに記載のセラミックス構造体の製造方法。8. The method for manufacturing a ceramic structure according to claim 1, wherein the sheath tube has a through hole, and a female screw member is mounted in the through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001286743A JP2003095759A (en) | 2001-09-20 | 2001-09-20 | Ceramic structure and method for manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001286743A JP2003095759A (en) | 2001-09-20 | 2001-09-20 | Ceramic structure and method for manufacturing the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003095759A true JP2003095759A (en) | 2003-04-03 |
Family
ID=19109665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001286743A Pending JP2003095759A (en) | 2001-09-20 | 2001-09-20 | Ceramic structure and method for manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003095759A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012162859A (en) * | 2011-02-03 | 2012-08-30 | Daifuzi Co Ltd | Separator for form support and construction method of concrete skeleton using the separator |
-
2001
- 2001-09-20 JP JP2001286743A patent/JP2003095759A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012162859A (en) * | 2011-02-03 | 2012-08-30 | Daifuzi Co Ltd | Separator for form support and construction method of concrete skeleton using the separator |
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