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1. 发明授权

US5932507A Method for preventing low-temperature degradation of tetragonal zirconia containing materials 失效
标题翻译：防止含四方氧化锆的材料的低温降解的方法
公开(公告)号：US5932507A
公开(公告)日：1999-08-03
申请号：US26228
申请日：1998-02-19
申请人： Remco van Weeren , Jeffrey A. Goldacker , Philip J. Whalen
发明人： Remco van Weeren , Jeffrey A. Goldacker , Philip J. Whalen
IPC分类号： C04B35/48 , C04B35/486 , C04B41/00 , C04B41/80 , C04B35/10
CPC分类号： C04B41/009 , C04B35/486 , C04B35/4885 , C04B35/632 , C04B41/0072 , C04B41/80 , C04B2235/3225 , C04B2235/3229 , C04B2235/3246 , C04B2235/6022 , C04B2235/6027 , C04B2235/6562 , C04B2235/6567 , C04B2235/662 , C04B2235/77
摘要： A ceramic body having a surface region containing tetragonal zirconia is sintered to at least 95% theoretical density at a temperature below about 1550 .degree. C. The surface region is then heat treated to reverse local stresses therein. Low temperature degradation in tetragonal zirconia, and materials containing tetragonal zirconia, is significantly inhibited. The heat treated ceramic is especially suited for use in structural components such as valves, engine housings, pistons (chambers) and the like which, during operation, are frequently exposed to temperatures ranging from room temperature to 500.degree. C. for prolonged periods of time.
摘要翻译：具有包含四方晶氧化锆的表面区域的陶瓷体在低于约1550℃的温度下被烧结至至少95％的理论密度。然后对表面区域进行热处理以反转其中的局部应力。四方晶氧化锆的低温降解和含有四方晶氧化锆的材料被显着抑制。经热处理的陶瓷特别适用于结构部件，例如阀门，发动机壳体，活塞（室）等，其在操作期间经常暴露于室温至500℃的温度下延长时间。

2. 发明授权

US5637540A Sintered silicon nitride of high toughness, strength and reliability 失效
标题翻译：烧结氮化硅具有高韧性，强度和可靠性
公开(公告)号：US5637540A
公开(公告)日：1997-06-10
申请号：US96203
申请日：1993-07-23
申请人： Chien-Wei Li , Jeffrey A. Goldacker
发明人： Chien-Wei Li , Jeffrey A. Goldacker
IPC分类号： C04B35/593 , C04B35/80 , C04B41/80 , C04B35/58
CPC分类号： C04B35/806 , C04B35/5935 , C04B41/80
摘要： A silicon nitride sintered body has a composition consisting essentially of 85 to 94% by weight .beta. silicon nitride, 6 to 15% by weight grain boundary phase consisting essentially of (i) at least two rare earth elements, wherein yttrium is considered a rare earth, and, optionally, strontium which, calculated as SrO, is 02 percent by weight of the total body, and (ii) at least two of Si, N, O and C, and an additive consisting essentially of a metal carbon compound present in the amount of about 0.2 to 3.5% by volume. The additive is substantially homogeneously dispersed within the sintered body. The sintered body has a microstructure wherein (i) the .beta. silicon nitride grains are acicular and have an average grain width ranging from 0.5 to 1.5 .mu.m, (ii) at least 25% of the grains have width greater than 0.7 .mu.m, and at least 10% of the grains have width greater than 1 .mu.m, and (iii) no more than 5% of grains have width greater than 3.5 .mu.m and apparent aspect ratio greater than 5, with the proviso that the average aspect ratio is at least 1.8 and a fracture origin, at least 90% of which is comprised of large acicular .beta.Si.sub.3 N.sub.4 grains, the average size of which ranges from about 15 to 50 .mu.m. Such a ceramic has high strength, high toughness and long term durability, and is especially suited for industrial applications such as components for gas turbine and automotive engines.
摘要翻译：氮化硅烧结体具有基本上由85至94重量％的β氮化硅，6至15重量％的晶界相组成的组成，其基本上由（i）至少两个稀土元素组成，其中钇被认为是稀土，和任选地，以SrO计，为总体重的0.02重量％的锶和（ii）Si，N，O和C中的至少两种，以及基本上由以下物质组成的金属碳化合物该量为约0.2-3.5％（体积）。添加剂基本均匀地分散在烧结体内。所述烧结体具有以下微结构：（i）所述β型氮化硅晶粒为针状，平均晶粒宽度为0.5〜1.5μm，（ii）所述晶粒的至少25％的宽度大于0.7μm，至少10％的晶粒具有大于1μm的宽度，和（iii）不超过5％的晶粒宽度大于3.5μm，并且视在长宽比大于5，条件是平均纵横比为至少1.8和断裂起点，其至少90％由大针状β3Si4N晶粒组成，其平均尺寸范围为约15至50μm。这种陶瓷具有高强度，高韧性和长期耐久性，并且特别适用于诸如燃气轮机和汽车发动机的部件的工业应用。

3. 发明授权

US5759933A Gas pressure sintered silicon nitride having high strength and stress rupture resistance 失效
标题翻译：具有高强度和应力抗裂性的气压烧结氮化硅
公开(公告)号：US5759933A
公开(公告)日：1998-06-02
申请号：US789699
申请日：1997-01-27
申请人： Chien-Wei Li , John Pollinger , Jean Yamanis , Jeffrey A. Goldacker
发明人： Chien-Wei Li , John Pollinger , Jean Yamanis , Jeffrey A. Goldacker
IPC分类号： C04B35/584 , C04B41/00 , C04B41/80 , C04B35/577 , C04B35/596
CPC分类号： C04B41/009 , C04B41/0072 , C04B41/80
摘要： A silicon nitride sintered body has a composition consisting essentially of 80 to 93% by weight .beta. silicon nitride, 7 to 20% by weight grain boundary phases consisting essentially of (i) at least two rare earth elements, wherein yttrium is considered a rare earth, and strontium which, calculated as SrO, is 0.5 to 5% by weight, and (ii) at least two of Si, N, O and C; and (c) silicon carbide particulate present in the amount of about 5 to 35 parts by weight per 100 parts by weight of components (a) and (b), said SiC being substantially homogeneously dispersed within said sintered body. Such a ceramic has high strength and long term durability, and is especially suited for industrial applications such as components for gas turbine and automotive engines.
摘要翻译：氮化硅烧结体具有基本上由80至93重量％的β氮化硅，7至20重量％的晶界相组成的组成，其基本上由（i）至少两个稀土元素组成，其中钇被认为是稀土，以SrO计，为0.5〜5重量％的锶，（ii）Si，N，O和C中的至少2个; 和（c）以每100重量份组分（a）和（b）为约5至35重量份的量存在的碳化硅颗粒，所述SiC基本均匀地分散在所述烧结体内。这种陶瓷具有高强度和长期耐久性，并且特别适用于诸如燃气轮机和汽车发动机的部件的工业应用。

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