JPH06116058A - Production of porous ceramic - Google Patents

Production of porous ceramic

Info

Publication number
JPH06116058A
JPH06116058A JP28241492A JP28241492A JPH06116058A JP H06116058 A JPH06116058 A JP H06116058A JP 28241492 A JP28241492 A JP 28241492A JP 28241492 A JP28241492 A JP 28241492A JP H06116058 A JPH06116058 A JP H06116058A
Authority
JP
Japan
Prior art keywords
ceramic
porous
slurry
die
carbonized
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
Application number
JP28241492A
Other languages
Japanese (ja)
Inventor
Munenori Kanai
宗統 金井
Atsunobu Une
篤▲暢▼ 宇根
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP28241492A priority Critical patent/JPH06116058A/en
Publication of JPH06116058A publication Critical patent/JPH06116058A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
    • C04B38/063—Preparing or treating the raw materials individually or as batches
    • C04B38/0635—Compounding ingredients
    • C04B38/0645—Burnable, meltable, sublimable materials
    • C04B38/067—Macromolecular compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)

Abstract

PURPOSE:To improve the dimensional accuracy by casting a ceramic slurry in the carbonized porous body or porous base material obtained by curing PVA to form into a desired shape, then burning and vaporizing the slurry. CONSTITUTION:A porous ceramic forming perform 1 is formed from a carbonized porous body prepared by baking a foamed phenol resin, etc., in an oxygen- free atmosphere or from a PVA cured body obtained by curing PVA mixed with org. solvent by the formalation reaction and then removing the solvent. The preform 1 is set to a gypsum die 4, and then a slurry 6 is injected into a vessel 5. The water in the slurry 6 is absorbed by the die 4 and dropped into a pan 9, and the ceramic grain in the slurry 6 is implanted on the surface of the die 4 and gradually grown. The water of the slurry is eliminated, a campanulate cast is formed around the die 4, a bolt 7 is released to detach the die 4 downward, the ceramic grain aggregate 10 is taken out, dried and then fired to obtain a porous ceramic having good dimensional accuracy.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、セラミック製の多孔質
絞りを用いた静圧流体軸受や流体のフィルタ等に使用さ
れる多孔質セラミック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 method for producing a porous ceramic used for a hydrostatic bearing or a fluid filter using a porous diaphragm made of ceramic.

【０００２】[0002]

【従来の技術】従来における多孔質セラミックの製造方
法は、浴室等で石鹸液を含ませる樹脂製スポンジ、即ち
高分子材料である発泡ウレタンを素材に、これを石膏型
内にセットした後、水とセラミック粒子や焼結助材との
混合液である泥しょう（以下スラリとも言う）を流し込
んで水分を石膏型に吸わせ、セラミック粒子や焼結助材
を石膏型の表面に徐々に着床させて成長させる。このよ
うにするとスポンジを内包し型枠に等しい鋳込品ができ
あがる。一方、鋳込品を乾燥させただけの状態ではセラ
ミック粒子間の結合力は極めて弱く白墨、即ち、黒板に
使用するチョークによく似た感じであるので切削、穴あ
け、或いは、サンドペーパ仕上げ等、様々な機械加工が
可能である。鋳込品を機械加工し形を整えたものは生加
工品と呼ばれる。以上述べた多孔質セラミックは泥しょ
う鋳込成形法と呼ばれる極く一般的な方法で製造され
る。生加工品を焼結すればセラミック粒子間は強固に結
合し、内包する樹脂製スポンジは燃焼して気化するた
め、元々スポンジであった部分が連なった気孔となって
多孔質セラミックが焼成できる。これを焼成品と呼ぶ。
なお、樹脂製スポンジは網目状の格子が立体的に連なっ
た構造をしており、少なくとも、その９割以上が気孔部
分である。このような構造になるのは、発泡時に個別に
膨らんで隣接する風船状の泡の界面がガス圧で、すべて
パンクするためで、気孔部分もすべて連なっているため
多量の水や石鹸液を通過吸収、または、滞留できるのは
周知の事実である。2. Description of the Related Art A conventional method for producing a porous ceramic is a resin sponge containing a soap solution in a bathroom or the like, that is, urethane foam which is a polymer material is set in a gypsum mold, and then water is used. Slurry (hereinafter also referred to as slurry), which is a mixed liquid of the ceramic particles and the sintering aid, is poured into the gypsum mold to absorb water, and the ceramic particles and the sintering aid are gradually settled on the surface of the gypsum mold. Let it grow. In this way, a sponge containing a sponge and a cast product equivalent to a mold is completed. On the other hand, when the cast product is just dried, the bonding force between the ceramic particles is extremely weak and it has a feeling very similar to chalk, that is, chalk used on a blackboard, so it can be used for cutting, drilling, sandpaper finishing, etc. It can be machined easily. A cast product that has been machined and shaped is called a raw product. The above-mentioned porous ceramics are manufactured by a very general method called a mud casting method. When the raw processed product is sintered, the ceramic particles are firmly bonded to each other, and the resin sponge contained therein is burned and vaporized, so that the porous ceramics can be fired by forming pores in which the originally sponge parts are connected. This is called a baked product.
The resin sponge has a structure in which a mesh-like lattice is three-dimensionally connected, and at least 90% or more of the sponge is a pore portion. The structure is such that when foaming, it expands individually and the interface of the adjacent bubble-like bubbles is gas pressure, causing all of them to puncture.Because all the pores are also continuous, a large amount of water or soap solution passes through. It is a well known fact that it can be absorbed or retained.

【０００３】[0003]

【発明が解決しようとする課題】以上述べた多孔質セラ
ミックの製造方法における解決しようとする課題につい
て述べる。第一の課題は、多孔質セラミックの形成母材
である樹脂製スポンジが極めて柔軟で掴みどころが無く
変形しやすいことである。これがスポンジの形成加工を
困難にしている。即ち、刃物を当てる以前に樹脂製スポ
ンジを固定しておくこと自体が難しく、また、刃物で切
ろうとすれば切れる前に変形するため単純な形状であっ
ても精度良く、かつ、狙った形状を得るのは極めて困難
である。とくに複雑な形状であれば尚更で、まったく不
可能に近い。このことは複雑かつ精度の良いセラミック
製の部分多孔質体を成形できない欠点となっている。The problems to be solved in the above-described method for producing a porous ceramic will be described. The first problem is that the resin-made sponge, which is the base material for forming the porous ceramic, is extremely flexible and is easily gripped and easily deformed. This makes the sponge formation process difficult. That is, it is difficult to fix the resin sponge before hitting the blade, and if you try to cut with the blade, it deforms before it cuts, so even if it is a simple shape it is accurate and the target shape It is extremely difficult to obtain. Especially if it has a complicated shape, it is almost impossible. This is a disadvantage that a complicated and accurate ceramic partially porous body cannot be formed.

【０００４】第二の課題は、鋳込品の機械加工時に樹脂
製スポンジに刃物が絡んで伸縮するため、元々崩れ易い
鋳込品の崩壊を招く、これは生加工品の表層、特に樹脂
製スポンジとセラミック粒子間との境界に生じる。この
多孔質表層の崩壊は多孔質セラミックを静圧流体軸受の
素材として使用する場合、多孔質表層そのものが流体の
通り道となり、ここでの流体の絞り効果が流体軸受の性
能に致命的な悪影響を与え、結果として流体軸受への適
用を困難にしている欠点となっている。以上、従来技術
における第一の課題は樹脂製スポンジの形状加工不適
性、第二の課題が鋳込品多孔質部の加工崩壊であり、こ
れらが樹脂製スポンジの柔軟性もしくは伸縮性に起因し
ていることを述べた。The second problem is that when the cast product is machined, the resin sponge causes the blade to entangle and expand and contract, resulting in the collapse of the cast product which is originally liable to collapse. It occurs at the boundary between the sponge and the ceramic particles. When the porous ceramic is used as a material for a hydrostatic bearing, the collapse of the porous surface layer serves as a passageway for the fluid itself, and the fluid throttling effect here has a fatal adverse effect on the performance of the fluid bearing. As a result, it is a drawback that it is difficult to apply to fluid bearings. As described above, the first problem in the conventional technology is the inability to process the shape of the resin sponge, and the second problem is the processing collapse of the porous portion of the casting, which is caused by the flexibility or stretchability of the resin sponge. That said.

【０００５】本発明は上記の欠点を改善するために提案
されたもので、その目的は、従来の樹脂製スポンジに代
えて、柔軟性もしくは伸縮性をまったく無くするため、
予め、真空中または無酸素雰囲気中で炭化処理せしめた
炭素質の多孔体（以下、炭化多孔体と言う）、またはポ
リビニ−ル・アルコールを主成分とし、これを硬化した
素材（以下、ＰＶＡ素材と言う）を多孔質セラミックの
製造母材に用いることで、前述の課題をすべて解決しよ
うとするものであって、所望形状に加工した炭化多孔体
またはＰＶＡ素材にセラミックの泥しょうを鋳込成形し
て多孔質セラミックを製造し、特定の部分のみが多孔質
のセラミック構造体、或いは、この構造体を用いた静圧
流体軸受を実現することにある。The present invention has been proposed in order to improve the above-mentioned drawbacks, and its purpose is to replace the conventional resin sponge with completely no flexibility or stretchability.
A carbonaceous porous material (hereinafter referred to as carbonized porous material) that has been carbonized in advance in a vacuum or in an oxygen-free atmosphere, or a material containing polyvinyl alcohol as a main component and hardened (hereinafter, PVA material). Is to be used as a base material for the production of porous ceramics, in order to solve all of the above-mentioned problems. Casting ceramic sludge into a carbonized porous body or PVA material processed into a desired shape Then, a porous ceramic is manufactured to realize a ceramic structure in which only a specific portion is porous, or a hydrostatic bearing using this structure.

【０００６】[0006]

【課題を解決するための手段】上記の目的を達成するた
め、本発明は所望の形状に加工した炭化多孔体にセラミ
ックの泥しょうを鋳込成形する工程と、ついで前記炭化
多孔体を燃焼気化させる工程とを備えることを特徴とす
る多孔質セラミックの製造方法を発明の要旨とするもの
である。さらに、本発明は所望の形状に加工した、ポリ
ビニ−ル・アルコールを主成分とし、これを硬化した多
孔質素材にセラミックの泥しょうを鋳込成形する工程
と、ついで前記多孔質素材を燃焼気化させる工程とを備
えることを特徴とする多孔質セラミックの製造方法を発
明の要旨とするものである。In order to achieve the above object, the present invention comprises the steps of casting ceramic mud into a carbonized porous body processed into a desired shape, and then combusting and vaporizing the carbonized porous body. The present invention is directed to a method for producing a porous ceramic, which is characterized by including the step of: Furthermore, the present invention comprises a step of casting polyvinyl alcohol / alcohol as a main component, which has been processed into a desired shape, and casting ceramic mud into a hardened porous material thereof, and then burning and vaporizing the porous material. The present invention is directed to a method for producing a porous ceramic, which is characterized by including the step of:

【０００７】[0007]

【作用】本発明は所望の形状に加工した炭化多孔体また
はＰＶＡ素材にセラミックの泥しょうを鋳込成形し、つ
いで前記炭化多孔体またはＰＶＡ素材を燃焼気化させて
多孔質セラミックを得ることによって、加工中に形くず
れを生ずることがなく、所望の形状と寸法精度のよいセ
ラミック体をうることができる。According to the present invention, ceramic sludge is cast into a carbonized porous body or PVA material processed into a desired shape, and then the carbonized porous body or PVA material is burned and vaporized to obtain a porous ceramic. It is possible to obtain a ceramic body having a desired shape and dimensional accuracy without causing the shape to be deformed during processing.

【０００８】[0008]

【実施例】次に本発明の実施例について説明する。な
お、実施例は一つの例示であって、本発明の精神を逸脱
しない範囲で、種々の変更あるいは改良を行い得ること
は言うまでもない。EXAMPLES Next, examples of the present invention will be described. It is needless to say that the embodiment is merely an example, and various modifications and improvements can be made without departing from the spirit of the present invention.

【０００９】図１は多孔質セラミック形成母材の一例を
示した立体図であって、形成母材は炭化多孔体またはＰ
ＶＡ素材を機械加工して得たものである。炭化多孔体の
素材としては、例えば発泡フェノール樹脂、或いは、炭
素繊維同士を絡み合せ交点を接着結合したフェルト品等
があり、これらを無酸素雰囲気で焼成することによって
適切な炭化多孔体を製造できるが、これに限るものでは
なく前述のように網目状の格子が立体的に連なったよう
な構造を有する炭化多孔体であればよいことは言うまで
もない。ＰＶＡ素材は、例えばポリビニ−ル・アルコー
ルに有機材料を混ぜ、これにメラニン樹脂等を加えて硬
化し、あるいはホルマル化反応を進めて硬化した後、有
機材料を溶解することによって製造される。尚、従来の
発泡ウレタン製のスポンジを炭化処理すると、これは熱
可塑性の樹脂であるので炭化する前に、収縮流動化して
多孔体構造が失われるため、そのまま炭化処理を施すの
は無理な点があり、炭化処理前に収縮流動化を防止する
対策が必要である。炭化多孔体またはＰＶＡ素材を用い
た多孔質セラミックの形成母材は、従来の樹脂製スポン
ジに特有の柔軟性や伸縮性を失って、多孔質セラミック
の形成母材として好ましい硬さと強度が付与される。炭
化多孔体はあたかも数年前に、暖房や料理用の熱源とし
て大量に使用された木材を炭化処理した炭そのもの、ま
たは、煉炭や豆炭に近い製品となる。この炭化多孔体
は、丁度、前述した鋳込品を乾燥させた状態に良く似た
性質をもっている。即ち、セラミックの鋳込品が白墨、
炭化多孔体が炭とすれば両者の性質を容易に想像でき
る。FIG. 1 is a three-dimensional view showing an example of a porous ceramic forming base material. The forming base material is a carbonized porous body or P.
It is obtained by machining a VA material. Examples of the material of the carbonized porous body include a foamed phenol resin, or a felt product in which carbon fibers are entangled with each other and the intersections are adhesively bonded, and an appropriate carbonized porous body can be produced by firing these in an oxygen-free atmosphere. However, it is needless to say that the carbonized porous body is not limited to this, and may be a carbonized porous body having a structure in which mesh-like lattices are three-dimensionally connected as described above. The PVA material is produced, for example, by mixing an organic material with polyvinyl alcohol, adding a melanin resin or the like to the mixture to cure it, or proceeding with a formalization reaction to cure it, and then dissolving the organic material. When a conventional urethane foam sponge is carbonized, it is a thermoplastic resin, so it shrinks and fluidizes before it is carbonized, and the porous structure is lost. Therefore, it is necessary to take measures to prevent shrinkage fluidization before carbonization. A porous ceramic forming base material using a carbonized porous body or a PVA material loses the flexibility and stretchability peculiar to conventional resin sponges, and is provided with hardness and strength preferable as the porous ceramic forming base material. It The carbonized porous body is a product that is similar to briquette or bean charcoal, which is carbonized wood that has been used in large quantities as a heat source for heating and cooking a few years ago. This carbonized porous body has properties very similar to those of the above-mentioned cast product in a dried state. That is, the ceramic casting is black ink,
If the carbonized porous body is charcoal, the properties of both can be easily imagined.

【００１０】以下、具体的に静圧流体軸受への応用とし
て、回転する軸の半径方向を支えるラジアル軸受に使用
される多孔質セラミックの製造を例に説明する。ここで
図１に示した多孔質セラミックの形成母材は、静圧流体
式のラジアル軸受を構成する軸受形成母材で、理解を容
易にするため一部分を破断して示してある。軸受形成母
材１はチューブ２の両端に位置するフランジ３が円筒の
内側に向かって張り出した一体構造を持つ、但し、上側
のフランジの内径は下側のフランジの内径より若干大き
くしてある。尚、従来の樹脂製スポンジであれば、この
ような形状に加工するのは至難のことであることは言う
までもない。As a specific application to a hydrostatic bearing, the production of a porous ceramic used for a radial bearing that supports the rotating shaft in the radial direction will be described below as an example. Here, the porous ceramic forming base material shown in FIG. 1 is a bearing forming base material forming a hydrostatic radial bearing, and a part thereof is cut away for easy understanding. The bearing forming base material 1 has an integral structure in which the flanges 3 located at both ends of the tube 2 project toward the inside of the cylinder, provided that the inner diameter of the upper flange is slightly larger than the inner diameter of the lower flange. Needless to say, it is extremely difficult to process such a shape with a conventional resin sponge.

【００１１】図２は鋳込成形治具の構造例を示した断面
図であって、図１で示した軸受形成母材１の鋳込成形治
具である。４はテーパ軸の内側に通し孔を開けた石膏型
で、軸受形成母材１は石膏型４のテーパ軸に軸受形成母
材１の上下にあるフランジ３の内径差を利用して、はめ
込み固定してある。５は石膏型４の周囲にスラリ６を入
れる容器であって、石膏型４と容器５とは着脱できるよ
う容器５の下方で気密されボルト７で結合してある。以
上が鋳込成形治具の本体で、８は鋳込成形治具本体を搭
載する中央に開口穴を有するベンチであって、９は受け
皿である。また、図中に示す破線１０は石膏型４の表面
に着床して成長したセラミック粒子塊で、その外側形状
を示したものである。このような構造をしているので石
膏型４に炭化多孔体またはＰＶＡ素材製の軸受形成母材
１をセットした後、容器５内にスラリ６を注ぎ込めば、
スラリ６内の水分は石膏型４に徐々に吸われ、受け皿９
内に滴下してゆくし、スラリ６内のセラミック粒子は石
膏型４の表面に着床し、やはり徐々に成長してゆく。こ
の結果、やがてスラリ６の水分は無くなり、石膏型４の
周囲に軸受形成母材１を内包する釣り鐘形状の鋳込品が
完成する。鋳込品を治具から外すには、石膏型４と容器
５とを結合するボルト７を除去し、石膏型４を下方に押
し込めば石膏型４がテーパ軸となっているので、容易に
鋳込品であるセラミック粒子塊１０と石膏型４とを分離
できることは言うまでもなく、以下、鋳込品を乾燥させ
所望の形状に加工した後、本焼成すればよい。加えて、
軸受形成母材１を石膏型４とはテーパ軸にはめ込む方法
を用いてセットし、即ち、位置決め固定される。従来の
方法では樹脂製スポンジでの形状を崩さない鋳込成形治
具内へのセットにも難点があった。FIG. 2 is a sectional view showing an example of the structure of the casting molding jig, which is the casting molding jig of the bearing forming base material 1 shown in FIG. 4 is a gypsum mold in which a through hole is formed inside the taper shaft, and the bearing forming base material 1 is fitted and fixed to the taper shaft of the gypsum mold 4 by utilizing the difference in inner diameters of the flanges 3 above and below the bearing forming base material 1. I am doing it. Reference numeral 5 is a container in which the slurry 6 is put around the gypsum mold 4, and the gypsum mold 4 and the container 5 are hermetically sealed below the container 5 so as to be detachable from each other and connected by bolts 7. The above is the main body of the casting molding jig, 8 is the bench having the opening hole in the center for mounting the casting molding jig main body, and 9 is the tray. Further, a broken line 10 shown in the figure is a ceramic particle lump grown on the surface of the gypsum mold 4 and grown, and shows the outer shape thereof. With such a structure, if the bearing forming base material 1 made of the carbonized porous body or PVA material is set in the plaster mold 4, and the slurry 6 is poured into the container 5,
The water in the slurry 6 is gradually sucked up by the plaster mold 4, and the saucer 9
The ceramic particles in the slurry 6 settle on the surface of the gypsum mold 4 and gradually grow. As a result, the water content of the slurry 6 will eventually disappear, and a bell-shaped cast product including the bearing forming base material 1 around the gypsum mold 4 will be completed. To remove the cast product from the jig, the bolt 7 connecting the gypsum mold 4 and the container 5 is removed, and the gypsum mold 4 is pushed downward, so that the gypsum mold 4 has a taper axis. It goes without saying that the ceramic particle agglomerates 10 as the inserts and the gypsum mold 4 can be separated, and thereafter, the cast products can be dried and processed into a desired shape, and then the main firing can be performed. in addition,
The bearing forming base material 1 and the gypsum mold 4 are set by a method of fitting them on a taper shaft, that is, they are positioned and fixed. In the conventional method, there is a problem in setting in a casting molding jig that does not lose the shape of the resin sponge.

【００１２】図３は静圧流体式ラジアル軸受の構造例
で、理解を助けるため一部を破断して示した立体図で、
前述の軸受形成母材１を内包させた鋳込品から製造した
ものである。１１は軸受、１２は炭化多孔体またはＰＶ
Ａ素材が焼成により燃焼気化して軸受１１内の完成した
セラミック多孔質部、１３は焼成前に軸受１１の外円筒
面１４からセラミック多孔質部１２に向けてドリル加工
で多数設けた流体の供給孔の一つ、１５は軸受１１の内
円筒面１６に鉢巻状に開口した多孔質リングで、以上は
鋳込成形による焼成品であるので一体構造である。１７
は軸受１１の内円筒面１６に極めて小さな隙間を介し
て、はめ合わされた回転軸である。なお、軸受１１と回
転軸１７との間を微小隙間にするには、焼成後にダイア
モンド砥石等により軸受１１の内円筒面１６や回転軸１
７の外径を精密に研削加工すればよい。このような構造
となっているので、供給孔１３から高圧流体を供給すれ
ば高圧流体はセラミック多孔質部１２が通路となって、
多孔質リング１５から軸受１１と回転軸１７間の微小隙
間に放出され、流体の圧力で軸受と回転軸１７とを非接
触で支持でき、静圧流体式のラジアル軸受が構成でき
る。FIG. 3 is an example of the structure of a hydrostatic radial bearing, which is a three-dimensional view with a part broken away to facilitate understanding.
It is manufactured from a cast product in which the above-mentioned bearing forming base material 1 is included. 11 is a bearing, 12 is a carbonized porous body or PV
Material A is burned and vaporized by firing to complete the ceramic porous portion in the bearing 11, and 13 is a fluid supply provided by drilling from the outer cylindrical surface 14 of the bearing 11 toward the ceramic porous portion 12 before firing. One of the holes, 15 is a porous ring that opens in a cylindrical shape on the inner cylindrical surface 16 of the bearing 11, and the above is a fired product by cast molding, and therefore has an integral structure. 17
Is a rotating shaft fitted to the inner cylindrical surface 16 of the bearing 11 with a very small gap. In addition, in order to form a minute gap between the bearing 11 and the rotary shaft 17, the inner cylindrical surface 16 of the bearing 11 and the rotary shaft 1 are made by a diamond grindstone or the like after firing.
The outer diameter of 7 may be precisely ground. With such a structure, when the high-pressure fluid is supplied from the supply hole 13, the high-pressure fluid becomes a passage through the ceramic porous portion 12.
It is discharged from the porous ring 15 into a minute gap between the bearing 11 and the rotary shaft 17, and the bearing and the rotary shaft 17 can be supported by the pressure of the fluid in a non-contact manner, so that a hydrostatic radial bearing can be constructed.

【００１３】以上、炭化多孔体またはＰＶＡ素材を形成
母材にすれば、従来の泥しょう鋳込成形法を用いて極め
て容易に静圧流体式のラジアル軸受を製造できることを
示した。なお、ラジアル軸受は単なる例であって、本発
明がセラミック内に形成する多孔質部形状の選択自由度
や寸法精度、多孔質表層の品質等を、従来に比べ大幅に
高められることを利用すれば、多孔質セラミックを用い
た様々な静圧流体軸受、例えば、回転する軸の軸方向を
支えるスラスト軸受、直進案内の送り直角方向を支える
スライダ軸受、或いは、螺旋状の案内である多孔質静圧
ねじ等の製造に利用でき、流体としては気体または液
体、例えば空気や油が使用できること等は言うまでもな
い。As described above, it has been shown that a hydrostatic radial bearing can be extremely easily manufactured by using the conventional sludge casting method by using the carbonized porous body or the PVA material as the forming base material. It should be noted that the radial bearing is merely an example, and the present invention can be used to significantly improve the degree of freedom in selecting the shape of the porous portion formed in the ceramic, the dimensional accuracy, the quality of the porous surface layer, etc. For example, various hydrostatic bearings using porous ceramics, such as thrust bearings that support the axial direction of the rotating shaft, slider bearings that support the feed-perpendicular direction of the straight guide, or porous static bearings that are spiral guides. It goes without saying that it can be used for manufacturing a pressure screw or the like, and gas or liquid such as air or oil can be used as the fluid.

【００１４】[0014]

【発明の効果】以上、説明したように本発明によれば、
所望の形状に加工した炭化多孔体またはＰＶＡ素材にセ
ラミックの泥しょうを鋳込成形する工程と、ついで前記
炭化多孔体またはＰＶＡ素材を燃焼気化させる工程とを
備えることによって、炭化多孔体またはＰＶＡ素材を形
成母材とした多孔質セラミックは、従来の樹脂製スポン
ジを形成母材とする方法に比べ、はるかにバリエイショ
ンに富んだ形状と寸法精度の良い形成母材を通常の機械
加工を用いて容易、かつ安価に製作でき、鋳込成形治具
へのセットも簡単である。また、これを用いて製造した
セラミック鋳込品の形状加工においても、内包する炭化
多孔体またはＰＶＡ素材とセラミック粒子間の機械的強
度が似たような性質であるので、従来のように刃物が樹
脂製スポンジに絡んで鋳込品の表層が崩壊するような事
態も避けられるため、多孔質表層の品質が極めて良好な
多孔質セラミックを内包するセラミック焼成品を製造で
きる等々、様々な効果がある。さらに、ラジアル軸受を
一例とした静圧流体軸受の製作で説明したように、軸受
面の限られた特定の箇所のみを多孔質にしたり、内包す
る多孔質部を流体の通路とする必要がある静圧流体軸受
の製作に本発明の製造方法を用いれば、従来、製作不可
能であった静圧流体軸受を高品質、且つ、安価に提供で
きる効果を与えることができる。As described above, according to the present invention,
The carbonized porous body or PVA material is provided with a step of casting ceramic sludge into a carbonized porous body or PVA material processed into a desired shape, and a step of burning and vaporizing the carbonized porous body or PVA material. Compared to the conventional method that uses a resin sponge as the forming base material, the porous ceramic that uses the forming base material is much easier to form by using ordinary machining than the forming base material with a variety of shapes and dimensional accuracy. In addition, it can be manufactured at low cost and is easy to set on the casting molding jig. Further, even in the shape processing of the ceramic cast product manufactured using this, since the mechanical strength between the carbonized porous body or PVA material to be encapsulated and the ceramic particles is similar, a blade as in the conventional case Since it is possible to avoid the situation where the surface layer of the cast product is disintegrated by being entangled with the resin sponge, it is possible to produce a ceramic fired product containing a porous ceramic with a very good quality of the porous surface layer, and so on. . Further, as described in the manufacture of a hydrostatic bearing using a radial bearing as an example, it is necessary to make only a limited specific portion of the bearing surface porous or to enclose the porous portion as a fluid passage. When the manufacturing method of the present invention is used for manufacturing a hydrostatic bearing, it is possible to provide a hydrostatic bearing which has been impossible to manufacture in the past with high quality and at low cost.

【図面の簡単な説明】[Brief description of drawings]

【図１】多孔質セラミックの形成母材の一例を示した立
体図である。FIG. 1 is a three-dimensional view showing an example of a base material for forming a porous ceramic.

【図２】鋳込成形する治具の構造例を示した断面図であ
る。FIG. 2 is a cross-sectional view showing a structural example of a jig for casting.

【図３】静圧流体式ラジアル軸受の構造例を示した立体
図である。FIG. 3 is a three-dimensional view showing a structural example of a hydrostatic radial bearing.

【符号の説明】[Explanation of symbols]

１ 軸受形成母材 ２ チューブ ３ フランジ ４ 石膏型 ５ 容器 ６ スラリ ７ ボルト ８ ベンチ ９ 受け皿 １０ セラミック粒子塊 １１ 軸受 １２ セラミック多孔質部 １３ 供給孔 １４ 外円筒面 １５ 多孔質リング １６ 内円筒面 １７ 回転軸 DESCRIPTION OF SYMBOLS 1 Bearing forming base material 2 Tube 3 Flange 4 Gypsum type 5 Container 6 Slurry 7 Bolt 8 Bench 9 Receiving tray 10 Ceramic particle mass 11 Bearing 12 Ceramic porous portion 13 Supply hole 14 Outer cylindrical surface 15 Porous ring 16 Inner cylindrical surface 17 Rotation axis

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 所望の形状に加工した炭化多孔体にセラ
ミックの泥しょうを鋳込成形する工程と、ついで前記炭
化多孔体を燃焼気化させる工程とを備えることを特徴と
する多孔質セラミックの製造方法。1. A method for producing a porous ceramic, comprising a step of casting ceramic mud into a carbonized porous body processed into a desired shape, and a step of burning and vaporizing the carbonized porous body. Method. 【請求項２】 所望の形状に加工した、ポリビニ−ル・
アルコールを主成分とし、これを硬化した多孔質素材に
セラミックの泥しょうを鋳込成形する工程と、ついで前
記多孔質素材を燃焼気化させる工程とを備えることを特
徴とする多孔質セラミックの製造方法。2. Polyvinyl chloride, which is processed into a desired shape
A method for producing a porous ceramic comprising alcohol as a main component, and a step of casting a ceramic slurry into a porous material obtained by hardening the alcohol, and then a step of burning and vaporizing the porous material. .
JP28241492A 1992-09-28 1992-09-28 Production of porous ceramic Pending JPH06116058A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28241492A JPH06116058A (en) 1992-09-28 1992-09-28 Production of porous ceramic

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28241492A JPH06116058A (en) 1992-09-28 1992-09-28 Production of porous ceramic

Publications (1)

Publication Number Publication Date
JPH06116058A true JPH06116058A (en) 1994-04-26

Family

ID=17652104

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28241492A Pending JPH06116058A (en) 1992-09-28 1992-09-28 Production of porous ceramic

Country Status (1)

Country Link
JP (1) JPH06116058A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109702861A (en) * 2019-02-26 2019-05-03 泉州市德化县丰弘机械有限公司 A kind of ceramic body formation system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109702861A (en) * 2019-02-26 2019-05-03 泉州市德化县丰弘机械有限公司 A kind of ceramic body formation system

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