JPH0517210A - Production of alumina-based composite sintered body and the sintered body - Google Patents
Production of alumina-based composite sintered body and the sintered bodyInfo
- Publication number
- JPH0517210A JPH0517210A JP3037946A JP3794691A JPH0517210A JP H0517210 A JPH0517210 A JP H0517210A JP 3037946 A JP3037946 A JP 3037946A JP 3794691 A JP3794691 A JP 3794691A JP H0517210 A JPH0517210 A JP H0517210A
- Authority
- JP
- Japan
- Prior art keywords
- alumina
- sintered body
- weight
- based composite
- zirconia
- 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.)
- Withdrawn
Links
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 36
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000292 calcium oxide Substances 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims description 23
- 229940043430 calcium compound Drugs 0.000 claims description 16
- 150000001674 calcium compounds Chemical class 0.000 claims description 16
- 238000005245 sintering Methods 0.000 claims description 16
- 239000011812 mixed powder Substances 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052791 calcium Inorganic materials 0.000 abstract description 5
- 239000011575 calcium Substances 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 5
- 238000001272 pressureless sintering Methods 0.000 abstract description 4
- 239000000843 powder Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 13
- 238000002156 mixing Methods 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000003381 stabilizer Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 229910002077 partially stabilized zirconia Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 101100371219 Pseudomonas putida (strain DOT-T1E) ttgE gene Proteins 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000000635 electron micrograph Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001513 hot isostatic pressing Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、緻密なアルミナ基複合
焼結体を製造する方法とこれによって得られるアルミナ
基複合焼結体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a dense alumina-based composite sintered body and an alumina-based composite sintered body obtained thereby.
【０００２】[0002]
【従来の技術】一般にアルミナセラミックスは、セラミ
ックスのなかでも特に熱的、化学的に安定であり、しか
も硬度が高く強度も比較的高いことからその用途が拡が
りつつある。ところがアルミナセラミックスは、靱性の
面ではジルコニア等の他のセラミックス材料に比べて優
れているとは言い難く、そのためアルミナにジルコニア
を複合して強靱化する試みがなされている。しかし、こ
のような強靱化のための複合化は未だ十分な効果が得ら
れておらず、さらに改善が望まれているのが実状であ
る。2. Description of the Related Art In general, alumina ceramics are particularly thermally and chemically stable among ceramics, and have high hardness and relatively high strength, so that their applications are expanding. However, it is hard to say that alumina ceramics are superior to other ceramic materials such as zirconia in terms of toughness, and therefore, attempts have been made to strengthen alumina by combining zirconia with them. However, such a composite for strengthening has not yet been sufficiently effective, and it is a reality that further improvement is desired.
【０００３】また、一般にセラミックスの強靱化には、
ジルコニアとの複合化のほかにウィスカーのように大き
なアスペクト比をもった粒子を分散させる方法がある。
この方法は、アスペクト比の大きな粒子によって亀裂を
大きく偏向させたり、亀裂の先端を架橋して破壊エネル
ギーを大きくし、亀裂の進行を妨げて靱性を向上させよ
うというものである。そして、このようなウィスカー強
化と前記ジルコニアによる強靱化とを組み合わせた方法
として、マルチタフニングという方法が提案されてい
る。Further, generally, for strengthening ceramics,
Besides compounding with zirconia, there is a method of dispersing particles having a large aspect ratio like whiskers.
According to this method, cracks are largely deflected by particles having a large aspect ratio, or the tips of the cracks are crosslinked to increase the fracture energy to prevent the progress of the cracks and improve the toughness. Then, as a method of combining such whisker strengthening and toughening by the zirconia, a method called multi-toughning has been proposed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前記の
大きなアスペクト比をもった粒子あるいはウィスカーを
分散配合する方法にあっては、これら粒子あるいはウィ
スカーを粉末の段階でマトリックス内に均一に分散させ
ることが非常に困難である。さらに、大きなアスペクト
比をもった粒子は一般に焼結時における物質移動を制限
するため、常圧焼結では高密度の焼結体が得にくく、そ
のためこのような焼結を行なう場合通常はホットプレス
法によって行なう。しかし、ホットプレス法で行なった
場合には焼結体中の柱状粒子が加圧によって配向し、材
料特性に方向性を生じるといった新たな不都合が生じ
る。However, in the method of dispersing and blending particles or whiskers having a large aspect ratio described above, it is possible to uniformly disperse these particles or whiskers in the matrix at the powder stage. Very difficult. Furthermore, since particles with a large aspect ratio generally limit mass transfer during sintering, it is difficult to obtain a high-density sintered body by pressureless sintering. Therefore, when such sintering is performed, hot pressing is usually performed. By law. However, when the hot pressing method is used, the columnar particles in the sintered body are oriented by the pressure, which causes a new inconvenience such that the material properties are oriented.
【０００５】本発明は前記事情に鑑みてなされたもの
で、その目的とするところは、常圧焼結で作製すること
ができ、しかも柱状粒子の配向のない十分に緻密なアル
ミナ基複合焼結体の製造方法とこれによって得られる焼
結体を提供することにある。The present invention has been made in view of the above circumstances, and an object thereof is a sufficiently dense alumina-based composite sintering that can be produced by pressureless sintering and has no columnar grain orientation. It is to provide a method for manufacturing a body and a sintered body obtained by the method.
【０００６】[0006]
【課題を解決するための手段】本発明における請求項１
記載のアルミナ基複合焼結体の製造方法では、アルミナ
５５〜９０重量％と、ジルコニア１０〜４５重量％と、
カルシウム化合物を酸化カルシウムに換算して２〜５重
量％と、不可避不純物とからなる混合粉末を１５００〜
１５７０℃で焼結することを前記課題の解決手段とし
た。また、請求項２記載のアルミナ基複合焼結体では、
アルミナ５５〜９０重量％と、ジルコニア１０〜４５重
量％と、カルシウム化合物を酸化カルシウムに換算して
２〜５重量％と、不可避不純物とからなる混合粉末が１
５００〜１５７０℃で焼結されることによって得られた
ものであり、アスペクト比５以上の柱状粒子が組織内に
存在し、気孔率が３％以下であることを前記課題の解決
手段とした。[Means for Solving the Problems] Claim 1 in the present invention
In the method for producing an alumina-based composite sintered body described above, 55 to 90% by weight of alumina, 10 to 45% by weight of zirconia, and
A mixed powder composed of 2 to 5% by weight of calcium compound converted to calcium oxide and inevitable impurities is 1500 to
Sintering at 1570 ° C. was used as a means for solving the above problems. Moreover, in the alumina-based composite sintered body according to claim 2,
A mixed powder consisting of 55 to 90% by weight of alumina, 10 to 45% by weight of zirconia, 2 to 5% by weight of calcium compound in terms of calcium oxide, and inevitable impurities is 1
It was obtained by sintering at 500 to 1570 ° C., columnar particles having an aspect ratio of 5 or more were present in the structure, and the porosity was 3% or less.
【０００７】以下、本発明のアルミナ基複合焼結体の製
造方法及びこれによって得られるアルミナ基複合焼結体
を詳しく説明する。本発明者は、アルミナ基複合焼結体
の強靱化のため、大きなアスペクト比を有した柱状粒子
を分散させる際に、粉末の段階で均一混合がし易く、し
かも柱状ではない粒子を混合して、焼結時の反応により
柱状粒子を生成させることに考え至り、鋭意研究の結果
本発明を完成した。The method for producing an alumina-based composite sintered body of the present invention and the alumina-based composite sintered body obtained by the method will be described in detail below. The inventors of the present invention, in order to strengthen the alumina-based composite sintered body, when dispersing columnar particles having a large aspect ratio, facilitate uniform mixing in the powder stage, and mix particles that are not columnar. As a result of intensive research, the present invention has been completed as a result of the idea of producing columnar particles by a reaction during sintering.
【０００８】すなわち、本発明ではまず、アルミナとジ
ルコニアとの原料粉末の混合時に、さらに添加剤として
カルシウム化合物を酸化カルシウム換算で２〜５重量％
一緒に混合する。ここで、原料粉末を構成するアルミナ
の配合量は全体の５５〜９０重量％、ジルコニアの配合
量は１０〜４５重量％とする。アルミナの配合量を５５
〜９０重量％としたのは、５５重量％未満ではアルミナ
の熱的、化学的安定性が損なわれるからであり、一方９
０重量％を越えるとジルコニア添加による強靱化が十分
に発揮されないからである。また、ジルコニアの配合量
を１０〜４５重量％としたのは、１０重量％未満ではジ
ルコニア添加による強靱化が十分に発揮されないからで
あり、４５重量％を越えるとアルミナの熱的、化学的安
定性が損なわれるからである。なお、ジルコニアとして
は、イットリアを１〜４モル％含む部分安定化ジルコニ
アを用いるのが好ましい。That is, in the present invention, first, when the raw material powders of alumina and zirconia are mixed, a calcium compound as an additive is further added in an amount of 2 to 5% by weight in terms of calcium oxide.
Mix together. Here, the blending amount of alumina constituting the raw material powder is 55 to 90% by weight, and the blending amount of zirconia is 10 to 45% by weight. Alumina content of 55
The reason why the content is up to 90% by weight is that if the content is less than 55% by weight, the thermal and chemical stability of alumina is impaired.
This is because if it exceeds 0% by weight, the toughness due to the addition of zirconia cannot be sufficiently exhibited. The amount of zirconia compounded is set to 10 to 45% by weight because if it is less than 10% by weight, the toughness due to the addition of zirconia is not sufficiently exhibited, and if it exceeds 45% by weight, the thermal and chemical stability of alumina is improved. This is because the sex is impaired. As the zirconia, it is preferable to use partially stabilized zirconia containing 1 to 4 mol% of yttria.
【０００９】さらに、添加剤としてのカルシウム化合物
の配合量を２〜５重量％（酸化カルシウム換算）とした
のは、２重量％未満ではカルシウムは単なる焼結助剤と
して、またはジルコニアの正方晶の安定化剤としてしか
機能しないからであり、一方５重量％を越えると、常圧
焼結によって気孔率を３％以下に緻密化することが困難
になるためである。すなわち、カルシウム化合物を加え
るのはあくまで焼結助剤や安定化剤の役割を果たすため
でなく、これ自身が均一混合がし易く、しかも焼結時の
反応により柱状粒子を生成するからである。なお、カル
シウム化合物としては、カチオンとしてカルシウムか、
あるいはカルシウムとジルコニウム、カルシウムとアル
ミニウム、カルシウムとジルコニウムとアルミニウムの
いずれかを含み、熱処理によってこれらの酸化物となる
ものが用いられる。Further, the compounding amount of the calcium compound as the additive is set to 2 to 5% by weight (calculated as calcium oxide). This is because it functions only as a stabilizer, and when it exceeds 5% by weight, it becomes difficult to densify the porosity to 3% or less by pressureless sintering. That is, the addition of the calcium compound does not merely serve as a sintering aid or a stabilizer, but the calcium compound itself is easy to uniformly mix, and columnar particles are generated by the reaction during sintering. The calcium compound may be calcium as a cation,
Alternatively, a material containing any one of calcium and zirconium, calcium and aluminum, calcium, zirconium and aluminum, which becomes an oxide of these by heat treatment is used.
【００１０】また、このような原料粉末としては、得ら
れる焼結体の緻密化を図るうえで、その平均粒径を０.
０１〜２.０μm程度とするのが好ましい。さらに、この
原料粉末を調整する際の混合操作については、通常の粉
末混合であることからボールミル法等の周知の方法を採
用することができる。次に、混合がなされた原料粉末を
周知の方法で所望形状に成形し、大気中常圧下にて１５
００〜１５７０℃の温度で焼結する。この場合に焼結温
度を１５００〜１５７０℃にしたのは、１５００℃未満
であるとカルシウム化合物が長軸方向に十分に粒成長せ
ず、５以上の大きなアスペクト比が得られないからであ
り、一方１５７０℃を越えるとカルシウム化合物が短軸
方向にも成長してしまい、アスペクト比が小さくなって
しまうからである。なお、焼結にあたっては、常圧焼結
に代わって熱間静水圧プレス（HIP）法を採用すること
ができ、その場合にはより緻密化が図れるため好まし
い。Further, as such a raw material powder, in order to make the obtained sintered body densified, the average particle diameter thereof is set to 0.
The thickness is preferably about 01 to 2.0 μm. Furthermore, as for the mixing operation when adjusting the raw material powder, a well-known method such as a ball mill method can be adopted since it is a normal powder mixing. Next, the mixed raw material powder is molded into a desired shape by a well-known method, and the powder is mixed under atmospheric pressure under normal pressure.
Sinter at a temperature of 00 to 1570 ° C. In this case, the sintering temperature is set to 1500 to 1570 ° C. because if it is less than 1500 ° C., the calcium compound does not sufficiently grow grains in the long axis direction and a large aspect ratio of 5 or more cannot be obtained. On the other hand, when the temperature exceeds 1570 ° C., the calcium compound grows in the minor axis direction and the aspect ratio becomes small. Incidentally, in the sintering, a hot isostatic pressing (HIP) method can be adopted instead of the normal pressure sintering, and in this case, it is preferable because the densification can be further achieved.
【００１１】[0011]
【作用】本発明における請求項１記載のアルミナ基複合
焼結体の製造方法によれば、カルシウム化合物を添加す
ることにより、焼結時にこのカルシウム化合物がアルミ
ナあるいはジルコニアのいずれかと反応して大きなアス
ペクト比をもった柱状粒子に生成し、しかもこれが組織
内にランダムに分散するものとなる。According to the method for producing an alumina-based composite sintered body according to the first aspect of the present invention, by adding a calcium compound, the calcium compound reacts with either alumina or zirconia during sintering and has a large aspect ratio. The particles are formed into columnar particles having a specific ratio, and these particles are randomly dispersed in the structure.
【００１２】[0012]
【実施例】以下、この発明のアルミナ基複合焼結体を実
施例によりさらに具体的に説明する。アルミナ粉末（平
均粒径；０.４μm）が５９.４重量％、安定化剤として
イットリアを２モル固溶させた部分安定化ジルコニア粉
末（平均粒径；０.０３μm）が３０.６重量％、カルシ
ウム化合物としてのCaZrO3が１０重量％（酸化カルシウ
ムに換算して３.１重量％）となるよう各粉末を秤量調
合し、ボールミルで１２時間混合した後、乾燥、解砕し
て原料粉末を得、さらにこれを成形して成形体を得た。EXAMPLES Hereinafter, the alumina-based composite sintered body of the present invention will be described more specifically by way of examples. 59.4% by weight of alumina powder (average particle size: 0.4 μm), 30.6% by weight of partially stabilized zirconia powder (average particle size: 0.03 μm) in which 2 mol of yttria was dissolved as a stabilizer. Each powder was weighed and mixed so that CaZrO 3 as a calcium compound would be 10% by weight (3.1% by weight in terms of calcium oxide), mixed with a ball mill for 12 hours, dried and crushed to obtain a raw material powder. To obtain a molded body.
【００１３】次いで、得られた成形体を大気中にて１５
５０℃で２時間加熱して常圧焼結を行ない、焼結体を得
た。この焼結体を研磨し、さらにこの研磨面の熱エッチ
ングした面を電子顕微鏡で観察した。得られたSEM（電
子顕微鏡）写真を図１に示す。図１より明らかなよう
に、アスペクト比が５以上の粒子が分散しているのが確
認された。また、得られた焼結体の破壊靱性値を測定
し、その結果を表１に示す。さらに、比較のため表１に
示すように、本発明のアルミナ基複合焼結体における原
料粉末の配合範囲外の組成からなる焼結体を３種類作製
し、その破壊靱性値を測定して結果を表１に併記する。
なお、破壊靱性値の測定はJIS R1607のSEPB法に準拠し
て行なった。Then, the obtained molded body is placed in the atmosphere for 15 minutes.
It was heated at 50 ° C. for 2 hours to carry out normal pressure sintering to obtain a sintered body. The sintered body was polished, and the thermally etched surface of the polished surface was observed with an electron microscope. The obtained SEM (electron microscope) photograph is shown in FIG. As is clear from FIG. 1, it was confirmed that particles having an aspect ratio of 5 or more were dispersed. Further, the fracture toughness value of the obtained sintered body was measured, and the results are shown in Table 1. Further, as shown in Table 1 for comparison, three types of sintered bodies having compositions outside the blending range of the raw material powder in the alumina-based composite sintered body of the present invention were prepared, and their fracture toughness values were measured to obtain the results. Is also shown in Table 1.
The fracture toughness value was measured according to the SEPB method of JIS R1607.
【００１４】
表１に示した結果より、本発明品は比較例品より大きな
破壊靱性値を有することが確認された。[0014] From the results shown in Table 1, it was confirmed that the product of the present invention has a larger fracture toughness value than the comparative product.
【００１５】[0015]
【発明の効果】以上説明したように本発明における請求
項１記載のアルミナ基複合焼結体の製造方法は、アルミ
ナとジルコニアとの粉末にカルシウム化合物を添加して
焼結するものであり、焼結時にこのカルシウム化合物が
アルミナあるいはジルコニアの少なくとも一方と反応す
ることによって大きなアスペクト比をもった柱状粒子に
生成し、しかもこれが組織内にランダムに分散するよう
にしたものである。よって、得られる焼結体は従来のア
ルミナ系焼結体に比べ一層緻密なものとなる。また、請
求項２記載のアルミナ基複合焼結体は、アスペクト比が
５以上の柱状粒子を組織内に有し、気孔率が３％以下の
ものであるから、アルミナとしての熱的、化学的安定性
に加え、靱性についても強化されたものとなり、よって
従来のものに比べ極めて有効な材料となる。As described above, in the method for producing an alumina-based composite sintered body according to the first aspect of the present invention, the calcium compound is added to the powder of alumina and zirconia and the sintering is performed. At the time of binding, the calcium compound reacts with at least one of alumina and zirconia to form columnar particles having a large aspect ratio, and these particles are randomly dispersed in the structure. Therefore, the obtained sintered body becomes more dense than the conventional alumina-based sintered body. The alumina-based composite sintered body according to claim 2 has columnar particles having an aspect ratio of 5 or more in its structure and a porosity of 3% or less. In addition to stability, the toughness is strengthened, so that it is a material that is extremely effective as compared with conventional materials.
【図１】図１は本発明のアルミナ基複合焼結体の一実施
例の、粒子構造を示す電子顕微鏡写真である。FIG. 1 is an electron micrograph showing a particle structure of an example of an alumina-based composite sintered body of the present invention.
Claims (2)
ア１０〜４５重量％と、カルシウム化合物を酸化カルシ
ウムに換算して２〜５重量％と、不可避不純物とからな
る混合粉末を１５００〜１５７０℃で焼結することを特
徴とするアルミナ基複合焼結体の製造方法。1. A mixed powder comprising 55 to 90% by weight of alumina, 10 to 45% by weight of zirconia, 2 to 5% by weight of a calcium compound converted into calcium oxide, and inevitable impurities at 1500 to 1570 ° C. A method for producing an alumina-based composite sintered body, which comprises sintering.
ア１０〜４５重量％と、カルシウム化合物を酸化カルシ
ウムに換算して２〜５重量％と、不可避不純物とからな
る混合粉末が１５００〜１５７０℃で焼結されることに
よって得られた、アスペクト比５以上の柱状粒子が組織
内に存在し、気孔率が３％以下のアルミナ基複合焼結
体。2. A mixed powder comprising 55 to 90% by weight of alumina, 10 to 45% by weight of zirconia, 2 to 5% by weight of a calcium compound converted into calcium oxide, and inevitable impurities at 1500 to 1570 ° C. An alumina-based composite sintered body having columnar particles having an aspect ratio of 5 or more present in the structure and having a porosity of 3% or less, obtained by sintering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3037946A JPH0517210A (en) | 1991-02-07 | 1991-02-07 | Production of alumina-based composite sintered body and the sintered body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3037946A JPH0517210A (en) | 1991-02-07 | 1991-02-07 | Production of alumina-based composite sintered body and the sintered body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0517210A true JPH0517210A (en) | 1993-01-26 |
Family
ID=12511721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3037946A Withdrawn JPH0517210A (en) | 1991-02-07 | 1991-02-07 | Production of alumina-based composite sintered body and the sintered body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0517210A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05294718A (en) * | 1992-04-23 | 1993-11-09 | Mitsubishi Materials Corp | Aluminum oxide-zirconium oxide based sintered ceramic excellent in toughness |
| WO2006080473A1 (en) * | 2005-01-27 | 2006-08-03 | Kyocera Corporation | Composite ceramic and method for producing same |
-
1991
- 1991-02-07 JP JP3037946A patent/JPH0517210A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05294718A (en) * | 1992-04-23 | 1993-11-09 | Mitsubishi Materials Corp | Aluminum oxide-zirconium oxide based sintered ceramic excellent in toughness |
| WO2006080473A1 (en) * | 2005-01-27 | 2006-08-03 | Kyocera Corporation | Composite ceramic and method for producing same |
| EP1845072A4 (en) * | 2005-01-27 | 2011-04-27 | Kyocera Corp | COMPOSITE CERAMIC AND METHOD FOR MANUFACTURING THE CERAMIC |
| JP5366398B2 (en) * | 2005-01-27 | 2013-12-11 | 京セラ株式会社 | Composite ceramics and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980514 |