JPH11189457A - Abrasion resistant alumina sintered compact - Google Patents
Abrasion resistant alumina sintered compactInfo
- Publication number
- JPH11189457A JPH11189457A JP9358307A JP35830797A JPH11189457A JP H11189457 A JPH11189457 A JP H11189457A JP 9358307 A JP9358307 A JP 9358307A JP 35830797 A JP35830797 A JP 35830797A JP H11189457 A JPH11189457 A JP H11189457A
- Authority
- JP
- Japan
- Prior art keywords
- alumina
- sintered body
- alumina sintered
- weight
- sintered compact
- 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.)
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Links
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、アルミナ含有量が
９６〜９７重量％と比較的低純度でありながら優れた耐
摩耗性を有するアルミナ焼結体に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alumina sintered body having a relatively low purity of 96 to 97% by weight of alumina and having excellent wear resistance.
【０００２】[0002]
【従来の技術】従来、アルミナ焼結体は耐熱性、耐食
性、絶縁性、機械的強度、ならびに耐摩耗性に優れた材
質であることから電子部品材料や産機部品材料、あるい
は構造部品材料など各種工業材料として幅広く利用され
ている。2. Description of the Related Art Conventionally, alumina sintered bodies have excellent heat resistance, corrosion resistance, insulation properties, mechanical strength, and abrasion resistance. Widely used as various industrial materials.
【０００３】例えば、産機部品材料として、ブラスト用
ノズル、粉砕機用部材、抄紙機用支持部材、固体輸送経
路におけるシュートやダクトなどの内張り材、軸受部
材、メカニカルシール、糸道、定盤、治工具などに使用
されていた。[0003] For example, industrial machine component materials include blast nozzles, crusher members, paper machine support members, lining materials such as chutes and ducts in solid transport routes, bearing members, mechanical seals, thread paths, surface plates, Used for jigs and tools.
【０００４】そして、これらの用途に使用されるアルミ
ナ焼結体は、主成分のアルミナに対し、助剤成分として
ＣａＯ、ＭｇＯ、ＳｉＯ2 のうち１種以上を添加したも
のや、さらには耐摩耗性を高めるために、アルカリ金
属、アルカリ土類金属、遷移金属、あるいは希土類から
なる酸化物を適宜選択して添加したものも提案されてい
る。Alumina sintered bodies used for these applications are obtained by adding at least one of CaO, MgO and SiO 2 as an auxiliary component to alumina as a main component, In order to enhance the property, there has been proposed a material in which an oxide composed of an alkali metal, an alkaline earth metal, a transition metal, or a rare earth is appropriately selected and added.
【０００５】例えば、特開昭５６−１７９８０号公報に
は、助剤成分としてＹ2 Ｏ3 、ＭｇＯ、ＣａＯ、ＮｉＯ
を含有し、ホットプレスにより焼成した耐摩耗性を有す
るアルミナ焼結体が開示されている。For example, JP-A-56-17980 discloses that as auxiliary components Y 2 O 3 , MgO, CaO, NiO
And an alumina sintered body having abrasion resistance fired by a hot press.
【０００６】また、特公平４−１３３１３号公報には、
ＴｉＯ2 、ＣｕＯ、Ｆｅ2 Ｏ3 、ＭｎＯ2 、ＺｒＯ2 、
ＳｉＯ2 等の助剤成分を５種類以上含有させた耐摩耗性
を有するアルミナ焼結体が開示されている。In Japanese Patent Publication No. 4-13313,
TiO 2 , CuO, Fe 2 O 3 , MnO 2 , ZrO 2 ,
An alumina sintered body having wear resistance containing five or more auxiliary components such as SiO 2 is disclosed.
【０００７】さらに、特公昭６２−６０３７号公報に
は、抄紙機用支持部材として助剤成分にＭｇＯ、Ｂ2 Ｏ
3 を用いたアルミナ純度９８〜９９．５％の高純度アル
ミナ焼結体が開示されている。Further, Japanese Patent Publication No. 62-6037 discloses that MgO, B 2 O is used as an auxiliary component as a supporting member for a paper machine.
No. 3 discloses a high-purity alumina sintered body having an alumina purity of 98 to 99.5%.
【０００８】[0008]
【発明が解決しようとする問題点】ところが、特開昭５
６−１７９８０号公報に開示されているアルミナ焼結体
は、助剤成分に高価なＹ2 Ｏ3 を添加する必要があり、
原料費が高くついてしまうといった問題点や、焼成工程
ではホットプレスを用いなければならないことから特殊
な焼成装置が必要となるなどの問題点があった。[Problems to be solved by the invention]
The alumina sintered body disclosed in JP-A-6-17980 requires the addition of expensive Y 2 O 3 to the auxiliary component,
There are problems such as a high raw material cost and a special firing device required because a hot press must be used in the firing process.
【０００９】また、特公平４−１３３１３号公報に開示
されているアルミナ焼結体は、５種類以上もの助剤成分
を添加しなければならず、原料費が高くつくとともに、
これらの助剤成分を均一に調合することが難しく、調合
作業が大変であった。 さらに、特公昭６２−６０３７
号公報に開示されている高純度アルミナ焼結体は、主原
料に高純度のアルミナ粉末が必要となるために非常に高
価なものになってしまうばかりか、アルミナ純度が高い
ことから完全に焼結させるためには１６００℃以上の温
度で焼成しなければならず、その結果、アルミナ粒子の
成長が促進され、満足のいく耐摩耗性を得ることは難し
いものであった。しかも、焼成温度が高くなると、炉壁
材やサヤ等の高温による耐久性の低下や消費電力が大き
くなるなどの問題点もあった。Further, the alumina sintered body disclosed in Japanese Patent Publication No. 4-13313 has to add as many as five or more kinds of auxiliary components, so that the raw material cost is high and
It was difficult to uniformly blend these auxiliary components, and the blending operation was difficult. Furthermore, Japanese Patent Publication No. 62-6037
The high-purity alumina sintered body disclosed in the above publication requires high-purity alumina powder as a main raw material, and is not only very expensive, but also completely burned due to high alumina purity. For sintering, it must be fired at a temperature of 1600 ° C. or more. As a result, the growth of alumina particles was promoted, and it was difficult to obtain satisfactory wear resistance. In addition, when the firing temperature is high, there are also problems such as a decrease in durability and an increase in power consumption due to a high temperature of the furnace wall material and sheath.
【００１０】そこで、本件出願人は、これらの問題点を
解消するために、Ａｌ2 Ｏ3 ９０〜９５重量％に対し、
ＳｉＯ2 、ＭｇＯ、Ｂ2 Ｏ3 の３種類の助剤成分をある
範囲内で添加することにより、安価で大気雰囲気中での
低温焼成が可能で、かつ耐摩耗性に優れたアルミナ焼結
体が得られることを先に提案した（特開平７−２３７９
６１号公報）。[0010] In order to solve these problems, the applicant of the present application has proposed a method for dissolving 90 to 95% by weight of Al 2 O 3 .
By adding three kinds of auxiliary components of SiO 2 , MgO and B 2 O 3 within a certain range, an alumina sintered body which is inexpensive, can be fired at a low temperature in an air atmosphere, and has excellent wear resistance (Japanese Patent Application Laid-Open No. 7-2379).
No. 61).
【００１１】しかしながら、ブラスト用ノズルや粉砕機
用部材、あるいは固体輸送経路に使用される内張り材な
ど過酷な条件下で使用される用途では、本件出願人が先
に提案したアルミナ焼結体でも充分な耐摩耗性を得るこ
とができなかった。However, in applications used under severe conditions, such as blast nozzles, pulverizer members, or lining materials used in solid transportation routes, the alumina sintered body previously proposed by the present applicant is sufficient. High abrasion resistance could not be obtained.
【００１２】[0012]
【発明の目的】本発明の目的は、前述したような過酷な
条件下でも優れた耐摩耗性を有するとともに、安価でか
つ大気雰囲気中での低温焼成が可能なアルミナ焼結体を
提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide an alumina sintered body which has excellent wear resistance even under the above-mentioned severe conditions, is inexpensive, and can be fired at low temperature in the atmosphere. It is in.
【００１３】[0013]
【問題点を解決するための手段】そこで、本発明は上記
課題に鑑み、Ａｌ2 Ｏ3 ９６〜９７重量％に対し、助剤
成分としてＳｉＯ2 を０．５〜１．０重量％、ＭｇＯを
１．５〜２．０重量％と、Ｂ2 Ｏ3 を０．５〜１．０重
量％の範囲でそれぞれ含有させ、ロックウェル硬度が８
９ｋｇ／ｍｍ2 以上である耐摩耗性アルミナ焼結体を構
成したものである。Means for Solving the problems] The present invention has been made in view of the above problems, to Al 2 O 3 96-97% by weight, the SiO 2 0.5 to 1.0 wt% as an auxiliary component, MgO and 1.5 to 2.0 wt%, the B 2 O 3 is contained respectively in the range of 0.5 to 1.0 wt%, the Rockwell hardness 8
This constitutes a wear-resistant alumina sintered body of 9 kg / mm 2 or more.
【００１４】即ち、本発明のアルミナ焼結体は、硬度が
ロックウェル硬度で８９ｋｇ／ｍｍ2 以上を有するとと
もに、アルミナ含有量が９６〜９７重量％の範囲にあ
り、かつ助剤成分として主にＳｉＯ2 、ＭｇＯ、Ｂ2 Ｏ
3 の３種類を用いることを特徴とする。That is, the alumina sintered body of the present invention has a Rockwell hardness of 89 kg / mm 2 or more, has an alumina content in the range of 96 to 97% by weight, and mainly has SiO 2 , MgO, B 2 O
3 is used.
【００１５】アルミナ焼結体の硬度をロックウェル硬度
で８９ｋｇ／ｍｍ2 としたのは、硬度がこれより小さく
なると充分な耐摩耗性を得ることができず、ブラスト用
ノズルや粉砕機用部材などの過酷な条件下で使用される
産機部品材料としては使用に耐えないからである。The reason why the hardness of the alumina sintered body is set to 89 kg / mm 2 in Rockwell hardness is that if the hardness is lower than this, sufficient abrasion resistance cannot be obtained, and blast nozzles, pulverizer members, etc. This is because it cannot withstand use as an industrial machine component material used under severe conditions.
【００１６】また、アルミナの含有量を９６〜９７重量
％とするのは、９７重量％より多くなると、アルミナ純
度が高くなりすぎて焼成温度を下げることができないた
め、後述する易焼結性のアルミナ粉体を用いたとしても
アルミナ粒子の成長を抑えきれず、耐摩耗性を高めるこ
とができないからであり、逆に、９６重量％未満となる
と、助剤成分の含有量が多くなるために耐摩耗性を高め
ることができないからである。 さらに、上記アルミナ
に対して含有させる助剤成分は、ＳｉＯ2 を０．５〜
１．０重量％、ＭｇＯを１．５〜２．０重量％と、Ｂ2
Ｏ3 を０．５〜１．０重量％の範囲でそれぞれ含有する
ことが重要である。The reason why the content of alumina is 96 to 97% by weight is that if the content is more than 97% by weight, the alumina purity becomes too high to lower the firing temperature. This is because even if alumina powder is used, the growth of alumina particles cannot be suppressed and the abrasion resistance cannot be increased. Conversely, if the content is less than 96% by weight, the content of the auxiliary component is increased. This is because the wear resistance cannot be increased. Further, the auxiliary component to be contained in the alumina is 0.5 to 0.5% of SiO 2 .
1.0% by weight, 1.5 to 2.0% by weight of MgO, B 2
O 3 to be contained respectively in the range of 0.5 to 1.0% by weight is important.
【００１７】これらの助剤成分のうち、ＳｉＯ2 とＭｇ
Ｏは焼結体中におけるアルミナ粒子同士の結合力を高め
る効果を有するとともに、ＭｇＯにおいてはアルミナ粒
子の成長を抑制する効果を有するものであり、このＭｇ
Ｏの含有量が１．５重量％未満では、アルミナの粒径が
大きくなり、アルミナ焼結体の硬度を高めることができ
ず、２．０重量％より多くなると、他の助剤成分が多く
なり、特にＳｉＯ2 量が多くなるとアルミナ焼結体の硬
度及び耐摩耗性を高めることができない。Of these auxiliary components, SiO 2 and Mg
O has the effect of increasing the bonding force between alumina particles in the sintered body, and MgO has the effect of suppressing the growth of alumina particles.
When the content of O is less than 1.5% by weight, the particle size of alumina becomes large and the hardness of the alumina sintered body cannot be increased. When the content of O is more than 2.0% by weight, other auxiliary components are increased. In particular, when the amount of SiO 2 is large, the hardness and wear resistance of the alumina sintered body cannot be increased.
【００１８】また、ＳｉＯ2 の含有量が０．５重量％未
満では、焼結性が悪くなるために緻密化することができ
ず、１．０重量％より多くなると、硬度の低いＳｉＯ2
が多くなりすぎるためにアルミナ焼結体の耐摩耗性が低
下する。Further, the content of SiO 2 is less than 0.5 wt%, can not be densified to sintering property is deteriorated, becomes more than 1.0% by weight, low hardness SiO 2
Is too large, the wear resistance of the alumina sintered body is reduced.
【００１９】さらに、Ｂ2 Ｏ3 は本焼成時における焼成
温度を下げ、アルミナ粒子の成長を抑制するために含有
するもので、この含有量が０．５重量％未満では、焼成
温度を下げる効果が小さいために、アルミナ粒径が大き
くなり、アルミナ焼結体の硬度を高めることができず、
逆に、１．０重量％より多くなると、ホウ酸ガラスの生
成量が多くなるためにアルミナ焼結体の硬度が低下す
る。Further, B 2 O 3 is contained for lowering the firing temperature during the main firing and for suppressing the growth of alumina particles. If the content is less than 0.5% by weight, the effect of lowering the firing temperature is obtained. Is small, the alumina particle size increases, the hardness of the alumina sintered body cannot be increased,
Conversely, if it exceeds 1.0% by weight, the hardness of the alumina sintered body decreases because the amount of borate glass produced increases.
【００２０】また、アルミナ焼結体の耐摩耗性を高める
ためには、焼結体中のアルミナ粒径も重要な要素であ
る。即ち、アルミナの平均結晶粒子径が４μｍより大き
くなるとアルミナ焼結体の硬度を高めることができず、
また、１μｍ未満とすることは製作上難しい。In order to enhance the wear resistance of the alumina sintered body, the particle size of alumina in the sintered body is also an important factor. That is, when the average crystal particle diameter of alumina is larger than 4 μm, the hardness of the alumina sintered body cannot be increased,
In addition, it is difficult to reduce the thickness to less than 1 μm in manufacturing.
【００２１】従って、焼結体中のアルミナの平均結晶粒
子径は１〜４μｍとすることが良い。Therefore, the average crystal grain size of alumina in the sintered body is preferably set to 1 to 4 μm.
【００２２】一方、本発明のアルミナ焼結体を得るに
は、まず、易焼結性のアルミナ粉体を使用することが必
要である。易焼結性のアルミナ粉体とは、アルミナ原料
を予め仮焼きして高密度化したアルミナ粉体のことであ
り、一度焼成してあることから粉体自体の硬度が高く、
また、微小径で均一な粒度分布をもったものが得られ
る。しかも、本焼成時における粒成長を遅くできるとと
もに、低温での焼成においても高い焼結性を得ることが
できる。On the other hand, in order to obtain the alumina sintered body of the present invention, it is necessary to use an alumina powder which is easily sintered. The easily sinterable alumina powder is an alumina powder obtained by calcining an alumina raw material in advance and increasing its density, and since it has been fired once, the hardness of the powder itself is high,
In addition, a fine particle having a uniform particle size distribution can be obtained. In addition, the grain growth at the time of main firing can be slowed down, and high sinterability can be obtained even at low temperature firing.
【００２３】その為、この易焼結性のアルミナ粉体を用
いれば、低い温度で焼成しても緻密質体とすることがで
き、高硬度をもったアルミナ焼結体を得ることができ
る。Therefore, if this easily sinterable alumina powder is used, a dense body can be obtained even when fired at a low temperature, and an alumina sintered body having high hardness can be obtained.
【００２４】なお、アルミナ焼結体の耐摩耗性を高める
ためには、アルミナの平均結晶粒子径を小さくする必要
があり、そのためにもアルミナ粉体は粒径が小さく、か
つ均一な粒度分布をもったものが良く、本発明のアルミ
ナ焼結体を得るには平均粒径が１．０μｍ以下でかつ比
表面積が５ｍ2 ／ｇ以上のものを用いることが良い。In order to increase the wear resistance of the alumina sintered body, it is necessary to reduce the average crystal grain size of alumina. Therefore, the alumina powder has a small grain size and a uniform grain size distribution. In order to obtain the alumina sintered body of the present invention, it is preferable to use one having an average particle diameter of 1.0 μm or less and a specific surface area of 5 m 2 / g or more.
【００２５】そして、このアルミナ粉体に対し、助剤成
分としてＳｉＯ2 を０．５〜１．０重量％、ＭｇＯを
１．５〜２．０重量％、Ｂ2 Ｏ3 を０．５〜１．０重量
％の範囲でそれぞれ添加するとともに、有機バインダー
を添加してボールミル、アトラクションミル、ピンミ
ル、振動ミル等により混練し、泥漿を製作して押出成形
法、射出成形法、鋳込成形法、テープ成形法等のセラミ
ック成形手段により所定の形状に成形するか、あるいは
上記泥漿をスプレードライヤーにより造粒して顆粒を製
作し、金型プレス、ラバープレス等のセラミック成形法
により所定の形状に成形する。そして、得られた成形体
を大気雰囲気中にて１４００〜１６００℃の温度にて本
焼成することにより、本発明のアルミナ焼結体を得るこ
とができる。Then, based on the alumina powder, 0.5 to 1.0% by weight of SiO 2 , 1.5 to 2.0% by weight of MgO, and 0.5 to 2.0% by weight of B 2 O 3 as auxiliary components. In addition to the addition in the range of 1.0% by weight, an organic binder is added, and the mixture is kneaded by a ball mill, an attraction mill, a pin mill, a vibration mill, etc. to produce a slurry, and an extrusion molding method, an injection molding method, a casting molding method. , Or formed into a predetermined shape by a ceramic forming means such as a tape forming method, or granulate the slurry by a spray drier to produce granules, and molded into a predetermined shape by a ceramic forming method such as a die press and a rubber press. Molding. Then, the obtained compact is subjected to main firing at a temperature of 1400 to 1600 ° C. in the air atmosphere to obtain the alumina sintered body of the present invention.
【００２６】かくして本発明のアルミナ焼結体を用いれ
ば、極めて高い耐摩耗性を有することから、軸受部材、
メカニカルシール、ガイド軸、糸道、ワイヤガイド、定
盤、治工具、紡糸ノズル、射出成形用ノズル、抄紙機用
支持部材、ポンプ、キャプスタン、シュートやダクトな
どの内張り材、ブラスト用ノズルなどの耐摩耗性を必要
とする様々な用途に用いることができる。また、本発明
のアルミナ焼結体は、比較的低純度であり、大気雰囲気
中にて低温焼成が可能であることから安価に製造するこ
とができる。Thus, when the alumina sintered body of the present invention is used, it has extremely high wear resistance.
Mechanical seals, guide shafts, yarn paths, wire guides, surface plates, jigs, spinning nozzles, injection molding nozzles, paper machine support members, pumps, capstans, lining materials such as chutes and ducts, blast nozzles, etc. It can be used for various applications requiring abrasion resistance. Further, the alumina sintered body of the present invention has relatively low purity and can be fired at a low temperature in an air atmosphere, so that it can be manufactured at low cost.
【００２７】[0027]
【発明の実施の形態】以下、本発明のアルミナ焼結体に
よりブラスト用ノズルを製作した具体例を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific example of manufacturing a blast nozzle using the alumina sintered body of the present invention will be described.
【００２８】図１に示すブラスト用ノズル１は、先端が
先細り状をなし、その先端部に噴射孔３を有する円筒体
２からなり、このノズル１の噴射孔３から微小粒子を被
加工物体（不図示）に対して噴出させることで、複雑形
状品を製作するものである。A blast nozzle 1 shown in FIG. 1 is formed of a cylindrical body 2 having a tapered tip and an injection hole 3 at the end thereof. (Not shown) to produce a complex-shaped product.
【００２９】このブラスト用ノズル１の製作するには、
主原料として純度９９．９％で、平均粒子径０．６μ
ｍ、比表面積７ｍ2 ／ｇの易焼結性のアルミナ粉体に、
助剤成分としてＳｉＯ2 を０．５重量％、ＭｇＯを１．
７５重量％、Ｂ2 Ｏ3 を０．７５重量％それぞれ添加す
るとともに、有機バインダーを加えてボールミルにて５
０時間均一に混合したあと、スプレードライヤーにて乾
燥させることで平均粒径が０．５μｍの顆粒を製作す
る。そして、この顆粒をゴム型に充填してラバープレス
成形によって円筒体を成形し、所定の形状、寸法精度に
切削加工を施したあと、１４６０℃の最高温度で約２時
間保持して本焼成することにより図１のブラスト用ノズ
ル１が得られる。To manufacture the nozzle 1 for blast,
99.9% purity as main raw material, average particle size 0.6μ
m, an easily sinterable alumina powder having a specific surface area of 7 m 2 / g,
0.5% by weight of SiO 2 and MgO as auxiliary components.
75% by weight and 0.75% by weight of B 2 O 3 were added, and an organic binder was added.
After uniformly mixing for 0 hour, the mixture is dried with a spray drier to produce granules having an average particle size of 0.5 μm. Then, the granules are filled in a rubber mold, and a cylindrical body is formed by rubber press molding. After performing a cutting process to a predetermined shape and dimensional accuracy, the main body is held at a maximum temperature of 1460 ° C. for about 2 hours to perform main firing. Thus, the blast nozzle 1 of FIG. 1 is obtained.
【００３０】また、このブラスト用ノズル１を構成する
アルミナ焼結体の組成についてＩＣＰ発光分析装置によ
って測定したところ、Ａｌ2 Ｏ3 ９７重量％、ＳｉＯ2
０．５重量％、ＭｇＯ１．７５重量％、Ｂ2 Ｏ3 ０．７
５重量％であった。また、ＳＥＭ写真から焼結体中のア
ルミナ粒子の平均結晶粒子径を測定したところ約２．１
μｍであり、さらにアルミナ焼結体のロックウェル硬度
をＪＩＳ Ｂ ７７２６により測定したところ、９０．
３ｋｇ／ｍｍ2 の硬度を有していた。The composition of the alumina sintered body constituting the blast nozzle 1 was measured by an ICP emission spectrometer. As a result, 97% by weight of Al 2 O 3 and SiO 2
0.5% by weight, 1.75% by weight of MgO, 0.7 of B 2 O 3
It was 5% by weight. The average crystal particle diameter of the alumina particles in the sintered body was measured from the SEM photograph to be about 2.1.
μm, and the Rockwell hardness of the alumina sintered body was measured according to JIS B 7726.
It had a hardness of 3 kg / mm 2 .
【００３１】そこで、このブラスト用ノズル１を用い、
粒度＃４００のＳｉＣ粒子を噴出させて被加工物体の溝
入れ加工を行う作業を１日３時間行ったところ、５０日
間まで使用することができた。なお、従来のアルミナ焼
結体からなるブラスト用ノズルでは３０日間程度で寿命
となっていた。Then, using this blast nozzle 1,
When the work of grooving the object to be processed by ejecting SiC particles having a particle size of # 400 was performed for 3 hours a day, it could be used for up to 50 days. The life of a conventional blast nozzle made of an alumina sintered body was about 30 days.
【００３２】（実験例１）ここで、助剤成分としてＳｉ
Ｏ2 、ＭｇＯ、Ｂ2 Ｏ3 を使用し、Ａｌ2 Ｏ3 含有量を
変化させたアルミナ焼結体を製作し、乾式状態における
耐摩耗試験を行った。(Experimental Example 1) Here, Si was used as an auxiliary component.
Using O 2 , MgO, and B 2 O 3 , an alumina sintered body in which the content of Al 2 O 3 was changed was manufactured, and a wear resistance test in a dry state was performed.
【００３３】試験条件としては、図２に示すように多数
のビーズ１０をブラスト用ノズル１から噴射して試料と
なる板状のアルミナ焼結体に一定時間衝突させた時の摩
耗量を測定するショットブラスト法にて行った。As a test condition, as shown in FIG. 2, the amount of wear when a large number of beads 10 are ejected from the blast nozzle 1 and made to collide with a plate-like alumina sintered body as a sample for a certain period of time is measured. This was performed by the shot blast method.
【００３４】ビーズ１０には粒度＃４００のＳｉＣ粒子
を用い、試料から８０ｍｍ離れた位置よりブラスト用ノ
ズル１でもって上記ビーズ１０を５ｋｇ／ｍｍ2 の噴出
圧にて噴射させ、１分後及び４分後の摩耗量をそれぞれ
測定した。The beads 10 were made of SiC particles having a particle size of # 400. The beads 10 were ejected from a position 80 mm away from the sample by a blast nozzle 1 at an ejection pressure of 5 kg / mm 2 , and after 1 minute and 4 minutes. The wear amount after one minute was measured.
【００３５】ただし、ここで摩耗量とは単位面積当たり
の摩耗量のことであり、その算出方法は数１に示す通り
である。Here, the wear amount is a wear amount per unit area, and the calculation method is as shown in Expression 1.
【００３６】数１ 単位面積当たりの摩耗量＝（減少重
量〔ｇ〕／噴射面積〔ｃｍ2 〕） ただし、噴射面積は１５ｃｍ2 とした。Equation 1 Abrasion amount per unit area = (reduced weight [g] / injection area [cm 2 ]) However, the ejection area was 15 cm 2 .
【００３７】それぞれの結果は表１に示す通りである。The results are as shown in Table 1.
【００３８】[0038]
【表１】 [Table 1]
【００３９】この結果、試料Ｃ〜Ｅに見られるように、
Ａｌ2 Ｏ3 含有量が９６〜９７重量％の範囲にあれば、
他の試料と比べて耐摩耗性を高められることが判る。As a result, as seen in Samples CE,
If the Al 2 O 3 content is in the range of 96 to 97% by weight,
It can be seen that the abrasion resistance can be increased as compared with other samples.
【００４０】なお、試料Ｇ〜ＪのＡｌ2 Ｏ3 含有量が９
９重量％以上では、アルミナ含有量が多すぎるために１
６００℃未満の温度では焼結させることができず、１７
００℃の温度で焼成したものでは緻密化することが難し
いために、他の試料と比較して最も大きく摩耗した。The samples G to J had an Al 2 O 3 content of 9
If the content is 9% by weight or more, the alumina content is too large,
At temperatures below 600 ° C., sintering is not possible,
Since it was difficult to densify the material fired at a temperature of 00 ° C., it was most worn as compared with other samples.
【００４１】また、試料Ａ，Ｂは、硬度が８９ｋｇ／ｃ
ｍ2 以上であったものの、Ａｌ2 Ｏ3 含有量が９５重量
％以下と少なく、また、摩耗し易いＳｉＯ2 の含有量が
多いために試料Ｃ〜Ｅと比較して摩耗が大きかった。Samples A and B have a hardness of 89 kg / c.
Although it was m 2 or more, the content of Al 2 O 3 was as low as 95% by weight or less, and the content of easily wearable SiO 2 was large, so that abrasion was large as compared with Samples C to E.
【００４２】これらの結果より、Ａｌ2 Ｏ3 含有量は９
６〜９７重量％とすれば良いことが判る。From these results, the content of Al 2 O 3 was 9
It turns out that the content should be 6 to 97% by weight.
【００４３】（実施例２）次に、Ａｌ2 Ｏ3 含有量を９
６〜９７重量％とし、助剤成分であるＳｉＯ2 、Ｍｇ
Ｏ、Ｂ2 Ｏ3 の含有量をそれぞれ異ならせたアルミナ焼
結体を試作し、実験例１と同様の条件にて乾式状態にお
ける耐摩耗試験を行った。なお、摩耗量は１分おきに測
定し、４分間行った。(Example 2) Next, the Al 2 O 3 content was adjusted to 9
6 to 97% by weight, and SiO 2 and Mg as auxiliary components
Prototypes of alumina sintered bodies having different contents of O and B 2 O 3 were produced, and a wear resistance test in a dry state was performed under the same conditions as in Experimental Example 1. The amount of wear was measured every other minute, and the measurement was performed for 4 minutes.
【００４４】結果は表２及び表３にそれぞれ示す通りで
ある。The results are as shown in Tables 2 and 3, respectively.
【００４５】[0045]
【表２】 [Table 2]
【００４６】[0046]
【表３】 [Table 3]
【００４７】この結果、ＳｉＯ2 が０．５〜１．０重量
％、ＭｇＯが１．５〜２．０重量％、Ｂ2 Ｏ3 が０．５
〜１．０重量％の範囲にあり、硬度が８９ｋｇ／ｃｍ2
以上であれば、耐摩耗性を大幅に高められることが判
る。As a result, 0.5 to 1.0% by weight of SiO 2 , 1.5 to 2.0% by weight of MgO, and 0.5% by weight of B 2 O 3
１．０1.0% by weight, and the hardness is 89 kg / cm 2.
If it is above, it turns out that abrasion resistance can be improved significantly.
【００４８】また、表３の試料Ｎｏ．１４及び２０に見
られるように、アルミナ焼結体の組成が上記範囲にあっ
ても焼結体中のアルミナ粒子の平均結晶粒子径が４μｍ
より大きいと硬度が低下し、耐摩耗性を高められないこ
とが判る。The sample No. in Table 3 14 and 20, even if the composition of the alumina sintered body was within the above range, the average crystal particle diameter of the alumina particles in the sintered body was 4 μm.
If it is larger, the hardness is reduced, and it can be seen that the wear resistance cannot be increased.
【００４９】よって、これらの結果より焼結体中のアル
ミナ粒子の平均結晶粒子径は１〜４μｍの範囲にあるも
のが良いことも判る。From these results, it can be understood that the average crystal particle diameter of the alumina particles in the sintered body is preferably in the range of 1 to 4 μm.
【００５０】[0050]
【発明の効果】以上のように、本発明によれば、Ａｌ2
Ｏ3 ９６〜９７重量％に対し、助剤成分としてＳｉＯ2
を０．５〜１．０重量％、ＭｇＯを１．５〜２．０重量
％、Ｂ2 Ｏ3 を０．５〜１．０重量％の範囲でそれぞれ
含有させ、ロックウェル硬度が８９ｋｇ／ｍｍ2 以上で
ある耐摩耗性アルミナ焼結体を構成したことから、比較
的低純度のアルミナ焼結体にもかかわらず、高硬度を有
し耐摩耗性に優れたアルミナ焼結体とすることができる
ため、電子部品材料や構造部品材料は勿論のこと、ブラ
スト用ノズルや粉砕機用部材、あるいは固体輸送経路に
使用される内張り材など過酷な条件下で使用される産機
部品材料としても好適に用いることができる。しかも、
本発明のアルミナ焼結体は、比較的低純度であり、大気
雰囲気中にて低温焼成が可能であることから安価に製造
することができる。As described above, according to the present invention, Al 2
With respect to 96 to 97% by weight of O 3 , SiO 2 is used as an auxiliary component.
0.5-1.0 wt%, MgO 1.5 to 2.0 wt%, the B 2 O 3 is contained respectively in the range of 0.5 to 1.0 wt%, the Rockwell hardness of 89 kg / from what has been configured to mm 2 or more in a wear-resistant alumina sintered body, despite the relatively low purity alumina sintered body, excellent be alumina sintered body wear resistance has a high hardness It can be used not only as electronic component materials and structural component materials, but also as industrial machine component materials used under harsh conditions such as blast nozzles and crusher members, or lining materials used in solid transportation routes. It can be suitably used. Moreover,
The alumina sintered body of the present invention has relatively low purity and can be fired at a low temperature in an air atmosphere, so that it can be manufactured at low cost.
【図１】本発明のアルミナ焼結体により製作したブラス
ト用ノズルを示す斜視図である。FIG. 1 is a perspective view showing a blast nozzle manufactured by using the alumina sintered body of the present invention.
【図２】耐摩耗試験の状態を示す模式図である。FIG. 2 is a schematic view showing a state of a wear resistance test.
１・・・ブラスト用ノズル ２・・・円筒体 ３・・・
噴出孔DESCRIPTION OF SYMBOLS 1 ... Blast nozzle 2 ... Cylindrical body 3 ...
Orifice
Claims (1)
剤成分としてＳｉＯ2 を０．５〜１．０重量％、ＭｇＯ
を１．５〜２．０重量％と、Ｂ2 Ｏ3 を０．５〜１．０
重量％の範囲でそれぞれ含有してなり、焼結体のロック
ウェル硬度が８９ｋｇ／ｍｍ2 以上であることを特徴と
する耐摩耗性アルミナ焼結体。(1) 96-97% by weight of Al 2 O 3 , 0.5-1.0% by weight of SiO 2 as an auxiliary component, and MgO
And 1.5 to 2.0 wt%, B 2 O 3 0.5 to 1.0
A wear-resistant alumina sintered body characterized in that the sintered body has a Rockwell hardness of 89 kg / mm 2 or more, each of which is contained in the range of weight%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35830797A JP3722606B2 (en) | 1997-12-25 | 1997-12-25 | Abrasion-resistant alumina sintered body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35830797A JP3722606B2 (en) | 1997-12-25 | 1997-12-25 | Abrasion-resistant alumina sintered body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11189457A true JPH11189457A (en) | 1999-07-13 |
| JP3722606B2 JP3722606B2 (en) | 2005-11-30 |
Family
ID=18458626
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35830797A Expired - Fee Related JP3722606B2 (en) | 1997-12-25 | 1997-12-25 | Abrasion-resistant alumina sintered body |
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| Country | Link |
|---|---|
| JP (1) | JP3722606B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103062572A (en) * | 2011-10-18 | 2013-04-24 | 王莹 | Abrasion-resistant rubber pipe and preparation method thereof |
| JP2013248630A (en) * | 2012-05-31 | 2013-12-12 | Hitachi Ltd | Alumina core for forming cooling passageway of gas turbine blade |
| JP5376413B1 (en) * | 2013-01-25 | 2013-12-25 | Ｔｏｔｏ株式会社 | Bonding capillary |
| JP2014091648A (en) * | 2012-11-02 | 2014-05-19 | Kyocera Corp | Alumina sintered product and wear-resistant member using the same |
| JP5614603B1 (en) * | 2013-12-03 | 2014-10-29 | Toto株式会社 | Bonding capillary |
-
1997
- 1997-12-25 JP JP35830797A patent/JP3722606B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103062572A (en) * | 2011-10-18 | 2013-04-24 | 王莹 | Abrasion-resistant rubber pipe and preparation method thereof |
| JP2013248630A (en) * | 2012-05-31 | 2013-12-12 | Hitachi Ltd | Alumina core for forming cooling passageway of gas turbine blade |
| JP2014091648A (en) * | 2012-11-02 | 2014-05-19 | Kyocera Corp | Alumina sintered product and wear-resistant member using the same |
| JP5376413B1 (en) * | 2013-01-25 | 2013-12-25 | Ｔｏｔｏ株式会社 | Bonding capillary |
| JP5614603B1 (en) * | 2013-12-03 | 2014-10-29 | Toto株式会社 | Bonding capillary |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3722606B2 (en) | 2005-11-30 |
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