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1. 发明专利

CA1281340C ZIRCONIA CERAMICS AND A PROCESS FOR PRODUCTION THEREOF 未知
公开(公告)号：CA1281340C
公开(公告)日：1991-03-12
申请号：CA517384
申请日：1986-09-03
申请人： MORISHITA JUNICHI
发明人： MORISHITA JUNICHI , KIMURA NOBUO , OKAMURA HIROMICHI
IPC分类号： C04B35/48
摘要： In the present invention, there is provided an easy sintering particulate starting material for use in producing zirconia ceramic, which material is coated with transition metal compound(s) on the surface thereof; by adding (a) fully stabilized zirconia powder, partially stabilized zirconia powder, or alumina containing partially stabilized zirconia powder, or (b) precursor to generate the zirconia powder through pyrolysis thereof, into a solution or dispersion of the transition metal compound(s) used as a sinter activator to form a suspension. The raw particulate material enables sintering at a lower temperature and suppression of grain growth in the ceramics, and therefore, can produce zirconia ceramics of high strength and high toughness even by firing at atmospheric pressure . In accordance with the present invention, a novel Y2O3 partially stabilized zirconia ceramic as well as a novel alumina containing partially stabilized zirconia ceramic can be produced by the above-mentioned method. The resultant Y2O3 partially stabilized zirconia ceramics have a Y2O3 content of from 1.3 mol.% to 2.0 mol.%, the content of the tetragonal phase being 65% or more, and is a high strength ceramic having a fracture toughness of more than 10 MN/m3/2, reaching 16 MN/m3/2. The resultant alumina containing partially stabilized zirconia ceramic has a novel composition containing transition metal ozide, and is a high strength ceramic having Vickers hardness of 1100 to 1600 Kg/mm2, and improved heat shock resistance. Particularly, when based on the above-mentioned Y2O3 partially stabilized zirconia, the fracture toughness will reach 18.5 MN/m3/2.

2. 发明申请

WO1987001369A1 HIGH-DENSITY ALUMINA-ZIRCONIA SINTER AND PROCESS FRO ITS PRODUCTION 审中-公开
标题翻译：高密度氧化锆ZIRCONIA烧结及其工艺生产
公开(公告)号：WO1987001369A1
公开(公告)日：1987-03-12
申请号：PCT/JP1986000449
申请日：1986-09-04
申请人： NIPPON SODA CO., LTD. , KIMURA, Nobuo , OKAMURA, Hiromichi , MORISHITA, Junichi
发明人： NIPPON SODA CO., LTD.
IPC分类号： C04B35/10
CPC分类号： C04B35/119
摘要： A high-density alumina-zirconia sinter, which comprises more than 60 mol % to 99 mol % of alpha-alumina, 1 mol % to less than 40 mol % of zirconia containing at least 65 % of a tetragonal crystal phase, and a transition metal oxide in an amount of 0.01-1 % in terms of an atomic ratio of a transition metal to the sum of aluminum and zirconium, and which has a remarkably high sintering density, high strength, high toughness, and high hardness useful as mechanical members, abrasion-resistant materials, cutting tools, etc. This sinter can be obtained by dispersing alpha-alumina powder or its precursor powder and zirconia powder or its precursor in a solution or suspension of a transition metal compound, and sintering the powder obtained from the resulting dispersion. Particularly preferable starting powders include alumina-zirconia composite powder obtained by mixing a dispersion of alpha-alumina powder in an aqueous solution of a zirconium salt with a precipitating agent, and calcining the obtained composite powder.

3. 发明申请

WO1986005174A1 SINTERED ZIRCONIA AND PROCESS FOR ITS PRODUCTION 审中-公开
标题翻译：烧结ZIRCONIA及其生产工艺
公开(公告)号：WO1986005174A1
公开(公告)日：1986-09-12
申请号：PCT/JP1985000372
申请日：1985-07-03
申请人： NIPPON SODA CO., LTD. , MORISHITA, Junichi , KIMURA, Nobuo , OKAMURA, Hiromichi
发明人： NIPPON SODA CO., LTD.
IPC分类号： C04B35/48
CPC分类号： C04B35/486 , C04B35/4885
摘要： High-density sintered zirconia containing a stabilizer such as Y2O3 can be produced through low-temperature sintering by first preparing readily sinterable zirconia powder having a transition metal compound on the surface thereof by adding stabilizer-containing zirconia powder or precursor powder capable of yielding zirconia upon thermal decomposition to a solution or dispersion of a transition metal compound which acts as a sintering accelerator, then adjusting the content of Y2O3 to 1.3 to 2.0 mol % and the content of a tetragonal phase to 65% or more. Thus, a partially stabilized sintered zirconia having a fracture toughness of 10 to 16 MM/m can be obtained. A composite product between this partially stabilized zirconia and alpha -alumina has an extremely high hardness.
摘要翻译：含有稳定剂如Y 2 O 3的高密度烧结氧化锆可以通过低温烧结来制备，首先通过将能够产生氧化锆的含稳定剂的氧化锆粉末或前体粉末添加到其上，首先制备其表面上具有过渡金属化合物的易烧结的氧化锆粉末热分解成作为烧结促进剂的过渡金属化合物的溶液或分散体，然后将Y 2 O 3的含量调节至1.3〜2.0摩尔％，将四方相的含量调整至65％以上。因此，可以获得断裂韧性为10〜16MM / m 3/2的部分稳定的烧结氧化锆。这种部分稳定的氧化锆和α-氧化铝之间的复合产品具有非常高的硬度。

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