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1. 发明授权

US5445776A Method for producing high density sintered silicon nitride (Si.sub.3 N.sub. 4 失效
标题翻译：生产高密度烧结氮化硅（Si3N4）的方法
公开(公告)号：US5445776A
公开(公告)日：1995-08-29
申请号：US814806
申请日：1991-12-31
申请人： Katuhiko Honma , Tsuneo Tatsuno , Hiroshi Okada , Masato Moritoki , Takao Fujikawa
发明人： Katuhiko Honma , Tsuneo Tatsuno , Hiroshi Okada , Masato Moritoki , Takao Fujikawa
IPC分类号： C04B35/593 , C04B35/58
CPC分类号： C04B35/593 , C04B35/5935
摘要： The specification describes a method for producing high density sintered silicon nitride(Si.sub.3 N.sub.4) having a relative density of at least 98%. In a first step, silicon nitride powder is compacted into a desired shape. It is then presintered in a second step, generally, under normal pressure to obtain a presintered body having a relative density of at least 92%. In a third step, the presintered body is subjected to a hot isostatic pressing(HIP) in an inert gas atmosphere of 1500-2100.degree. C. and of nitrogen gas partial pressure of at least 500 atm. Since the presintering does not require any capsule, it is possible to produce high density sintered Si.sub.3 N.sub.4 of complex configurations. As a sintering aid, Y.sub.2 O.sub.3 --Al.sub.2 O.sub.3 --MgO system sintering aid is particularly effective. To improve the strength of sintered Si.sub.3 N.sub.4, it is effective to add a heat treatment step after the HIP and maintain the temperature of the sintered Si.sub.3 N.sub.4, above 500.degree. C. for a while. Between the second and third steps, the temperature of the presintered body is preferably maintained above 500.degree. C. These temperature controls are effective not only to improve the strength of sintered Si.sub.3 N.sub.4 but also to save the thermal energy and to shorten the production cycle.
摘要翻译：该说明书描述了一种生产相对密度至少为98％的高密度烧结氮化硅（Si3N4）的方法。在第一步骤中，氮化硅粉末被压制成所需的形状。通常在常压下第二步骤中预烧结，得到相对密度至少为92％的预烧结体。在第三步骤中，在1500-2100℃的惰性气体气氛和至少500atm的氮气分压下对预烧结体进行热等静压（HIP）。由于预烧结不需要任何胶囊，因此可以生产复合结构的高密度烧结Si 3 N 4。作为烧结助剂，Y2O3-Al2O3-MgO体系的烧结助剂特别有效。为了提高烧结Si3N4的强度，在HIP之后添加热处理步骤并将烧结的Si 3 N 4的温度保持在500℃以上一段时间是有效的。在第二和第三步骤之间，预烧结体的温度优选保持在500℃以上。这些温度控制不仅有效地提高了烧结Si 3 N 4的强度，而且有效地节约了热能并缩短了生产周期。

2. 发明授权

US5665291A Method for producing high density sintered silicon nitride(Si.sub.3 N.sub.4 ) 失效
标题翻译：生产高密度烧结氮化硅（Si3N4）的方法
公开(公告)号：US5665291A
公开(公告)日：1997-09-09
申请号：US463273
申请日：1995-06-05
申请人： Katuhiko Honma , Tsuneo Tatsuno , Hiroshi Okada , Masato Moritoki , Takao Fujikawa
发明人： Katuhiko Honma , Tsuneo Tatsuno , Hiroshi Okada , Masato Moritoki , Takao Fujikawa
IPC分类号： C04B35/593 , C04B35/584
CPC分类号： C04B35/593 , C04B35/5935
摘要： The specification describes a method for producing high density sintered silicon nitride (Si.sub.3 N.sub.4) having a relative density of at least 98%. In a first step, silicon nitride powder is compacted into a desired shape. It is then pre-sintered in a second step, generally, under normal pressure to obtain a presintered body having a relative density of at least 92%. In a third step, the presintered body is subjected to a hot isostatic pressing (HIP) in an inert gas atmosphere of 1500.degree.-2100.degree. C. and of nitrogen gas partial pressure of at least 500 atm. Since the presintering does not require any capsule, it is possible to produce high density sintered Si.sub.3 N.sub.4 of complex configurations. As a sintering aid, Y.sub.2 O.sub.3 --Al.sub.2 O.sub.3 --MgO system sintering aid is particularly effective. To improve the strength of sintered Si.sub.3 N.sub.4, it is effective to add a heat treatment step after the HIP and maintain the temperature of the sintered Si.sub.3 N.sub.4 above 500.degree. C. for a while. Between the second and third steps, the temperature of the presintered body is preferably maintained above 500.degree. C. These temperature controls are effective not only to improve the strength of sintered Si.sub.3 N.sub.4 but also to save the thermal energy and to shorten the production cycle.
摘要翻译：该说明书描述了一种生产相对密度至少为98％的高密度烧结氮化硅（Si3N4）的方法。在第一步骤中，氮化硅粉末被压制成所需的形状。通常在常压下在第二步骤中预烧结，得到相对密度至少为92％的预烧结体。在第三步骤中，将预烧结体在1500-2100℃的惰性气体气氛和至少500atm的氮气分压下进行热等静压（HIP）。由于预烧结不需要任何胶囊，因此可以生产复合结构的高密度烧结Si 3 N 4。作为烧结助剂，Y2O3-Al2O3-MgO体系的烧结助剂特别有效。为了提高烧结Si3N4的强度，在HIP之后添加热处理步骤并将烧结的Si 3 N 4的温度保持在500℃以上一段时间是有效的。在第二和第三步骤之间，预烧结体的温度优选保持在500℃以上。这些温度控制不仅有效地提高了烧结Si 3 N 4的强度，而且有效地节约了热能并缩短了生产周期。

3. 发明授权

US5603876A Method for producing high density sintered silicon nitride (SI.sub.3 N.sub. 4 失效
标题翻译：生产高密度烧结氮化硅（SI3N4）的方法
公开(公告)号：US5603876A
公开(公告)日：1997-02-18
申请号：US251052
申请日：1988-09-26
申请人： Katuhiko Honma , Tsuneo Tatsuno , Hiroshi Okada , Masato Moritoki , Takao Fujikawa
发明人： Katuhiko Honma , Tsuneo Tatsuno , Hiroshi Okada , Masato Moritoki , Takao Fujikawa
IPC分类号： C04B35/593 , C04B35/584
CPC分类号： C04B35/593 , C04B35/5935
摘要： The specification describes a method for producing high density sintered silicon nitride(Si.sub.3 N.sub.4) having a relative density of at least 98%. In a first step, silicon nitride powder is compacted into a desired shape. It is then presintered in a second step, generally, under normal pressure to obtain a presintered body having a relative density of at least 92%. In a third step, the presintered body is subjected to a hot isostatic pressing(HIP) in an inert gas atmosphere of 1500-2100.degree. C. and of nitrogen gas partial pressure of at least 500 atm. Since the presintering does not require any capsule, it is possible to produce high density sintered Si.sub.3 N.sub.4 of complex configurations. As a sintering aid, Y.sub.2 O.sub.3 -Al.sub.2 O.sub.3 -MgO system sintering aid is particularly effective. To improve the strength of sintered Si.sub.3 N.sub.4, it is effective to add a heat treatment step after the HIP and maintain the temperature of the sintered Si.sub.3 N.sub.4 above 500.degree. C. for a while. Between the second and third steps, the temperature of the presintered body is preferably maintained above 500.degree. C. These temperature controls are effective not only to improve the strength of sintered Si.sub.3 N.sub.4 but also to save the thermal energy and to shorten the production cycle.
摘要翻译：该说明书描述了一种生产相对密度至少为98％的高密度烧结氮化硅（Si3N4）的方法。在第一步骤中，氮化硅粉末被压制成所需的形状。通常在常压下第二步骤中预烧结，得到相对密度至少为92％的预烧结体。在第三步骤中，在1500-2100℃的惰性气体气氛和至少500atm的氮气分压下对预烧结体进行热等静压（HIP）。由于预烧结不需要任何胶囊，因此可以生产复合结构的高密度烧结Si 3 N 4。作为烧结助剂，Y2O3-Al2O3-MgO体系的烧结助剂特别有效。为了提高烧结Si3N4的强度，在HIP之后添加热处理步骤并将烧结的Si 3 N 4的温度保持在500℃以上一段时间是有效的。在第二和第三步骤之间，预烧结体的温度优选保持在500℃以上。这些温度控制不仅有效地提高了烧结Si 3 N 4的强度，而且有效地节约了热能并缩短了生产周期。

4. 发明授权

US4121930A Nitrogen containing high speed steel obtained by powder metallurgical process 失效
标题翻译：通过粉末冶金工艺获得的含氮高速钢
公开(公告)号：US4121930A
公开(公告)日：1978-10-24
申请号：US755141
申请日：1976-12-29
申请人： Toru Yukawa , Nobuyasu Kawai , Katuhiko Honma , Hirofumi Fujimoto , Hiroshi Takigawa , Minoru Hirono , Masaru Ishii , Tsuneo Tatsuno
发明人： Toru Yukawa , Nobuyasu Kawai , Katuhiko Honma , Hirofumi Fujimoto , Hiroshi Takigawa , Minoru Hirono , Masaru Ishii , Tsuneo Tatsuno
IPC分类号： C22C33/02 , C22C38/00 , C22C38/12 , B22F3/00
CPC分类号： C22C38/12
摘要： The present invention relates to a nitrogen containing high speed steel obtained by the powder metallurgical process, which comprises at least 0.40% N, 1.6 to 15% V, C in an amount satisfying the relationship of 0.5 + 0.2V (%) .ltoreq. (C + N) .ltoreq. 0.8 + 0.2V (%), at least one element selected from the group consisting of up to 15% of Cr, up to 10% of Mo, up to 20% of W and up to 15% of Co with the balance iron.
摘要翻译：本发明涉及通过粉末冶金方法获得的含氮高速钢，其含有至少0.40％N，1.6至15％V，C，其量满足0.5 + 0.2V（％）的关系。（C + N）

5. 发明授权

US4140527A Nitrogen containing powder metallurgical tool steel 失效
标题翻译：含氮粉末冶金工具钢
公开(公告)号：US4140527A
公开(公告)日：1979-02-20
申请号：US799338
申请日：1977-05-23
申请人： Nobuyasu Kawai , Katuhiko Honma , Hirofumi Fujimoto , Hiroshi Takigawa , Tsuneo Tatsuno
发明人： Nobuyasu Kawai , Katuhiko Honma , Hirofumi Fujimoto , Hiroshi Takigawa , Tsuneo Tatsuno
IPC分类号： C22C33/02 , C22C38/00 , C22C38/02 , C22C38/08 , C22C38/10
CPC分类号： C22C33/0278 , C22C33/0292
摘要： A nitrogen containing powder metallurgical tool steel comprising at least 0.40% N, 1.6 - 15% V, C in an amount satisfying the relationship of0.2 + 0.2 V(%).ltoreq.(C + N)
摘要翻译：一种含氮粉末冶金工具钢，其含有满足0.2 + 0.2V（％）

6. 发明授权

US4121929A Nitrogen containing high speed steel obtained by powder metallurgical process 失效
标题翻译：通过粉末冶金工艺获得的含氮高速钢
公开(公告)号：US4121929A
公开(公告)日：1978-10-24
申请号：US767900
申请日：1977-02-11
申请人： Nobuyasu Kawai , Katuhiko Honma , Hirofumi Fujimoto , Hiroshi Takigawa , Minoru Hirano , Masaru Ishii
发明人： Nobuyasu Kawai , Katuhiko Honma , Hirofumi Fujimoto , Hiroshi Takigawa , Minoru Hirano , Masaru Ishii
IPC分类号： C22C33/02 , C22C38/00 , B22F3/00
CPC分类号： C22C33/0278 , C22C33/0292 , C22C38/001
摘要： A nitrogen containing high speed steel produced by powder metallurgical process, which comprises at least 0.40% N, 3.0-15% V, C in an amount satisfying the relationship of 1.0 + 0.2V (%) .ltoreq. (C + N) .ltoreq. 1.5 + 0.2V (%), at least one element selected from the group consisting of up to 15% Cr, up to 10% Mo, up to 20% W, and up to 15% Co, with balance iron.
摘要翻译：通过粉末冶金工艺生产的含氮高速钢，其含有满足1.0 + 0.2V（％）=（C + N）的关系的量的至少0.40％N，3.0-15％V，C / = 1.5 + 0.2V（％），选自由高达15％的Cr，至多10％的Mo，至多20％的W和至多15％的Co，余量的铁组成的组中的至少一种元素。

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