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41. 发明授权

US5081078A Sinterable ceramic powder, process for its preparation, silicon nitride ceramic manufactured therefrom, process for its manufacture and its use 失效
标题翻译：可烧结陶瓷粉末，其制备方法，其制造的硅酸盐陶瓷，其制造方法及其用途
公开(公告)号：US5081078A
公开(公告)日：1992-01-14
申请号：US443881
申请日：1989-11-30
申请人： Marcellus Peuckert , Martin Bruck , Thomas Gerdau , Hans-Jerg Kleiner , Tilo Vaahs , Fritz Aldinger
发明人： Marcellus Peuckert , Martin Bruck , Thomas Gerdau , Hans-Jerg Kleiner , Tilo Vaahs , Fritz Aldinger
IPC分类号： C01B21/068 , C04B35/589 , C04B35/593 , C08G77/48 , C08G77/62
CPC分类号： C04B35/589 , C04B35/5935
摘要： The invention relates to a novel sinterable ceramic powder, to its preparation, to its processing to form silicon nitride ceramic and to said material itself and its use. The sinterable ceramic powder is prepared by dissolving the polysilazane of formula (I)[CH.sub.3 SiHNH].sub.n [CH.sub.3 SiN].sub.nwhere n is about 10 to 12, in an organic solvent, suspending a pulverulent sinter aid in this solution and then evaporating the solvent and pyrolyzing the residue in an inert gas atmosphere at 500.degree. to 1600.degree. C.The resulting ceramic powder can be used to form a shaped article and then to manufacture silicon nitride ceramic by sintering. It is also possible, however, to form a shaped article from the as yet unpyrolyzed residue obtained after evaporation of the solvent, and then to pyrolyze and sinter said article.The ceramic obtained can be used to manufacture components subject to high mechanical, thermal and corrosive stress.
摘要翻译：本发明涉及一种新型的可烧结陶瓷粉末，用于其制备，以形成氮化硅陶瓷的加工以及所述材料本身及其用途。可烧结陶瓷粉末是通过在有机溶剂中溶解式（I）[CH3SiHNH] n [CH3SiN] n的聚硅氮烷[N，N-二甲基甲酰胺] n [CH3SiN] n，其中n为约10〜12，将粉状烧结助剂悬浮在该溶液中，然后蒸发溶剂，在惰性气体气氛中在500〜1600℃下热解残渣。得到的陶瓷粉末可用于形成成形制品，然后通过烧结制造氮化硅陶瓷。然而，也可以从蒸发溶剂后获得的仍然未裂解的残余物形成成型制品，然后热解并烧结所述制品。获得的陶瓷可用于制造受到高机械，热和腐蚀应力的部件。

42. 发明授权

US5080844A SI3N4 process using polysilane or polysilazane as a binder 失效
标题翻译：使用聚硅烷或聚硅氮烷作为粘合剂的SI3N4工艺
公开(公告)号：US5080844A
公开(公告)日：1992-01-14
申请号：US264932
申请日：1988-10-31
申请人： Sophia R. Su
发明人： Sophia R. Su
IPC分类号： C04B35/589 , C04B35/593
CPC分类号： C04B35/589 , C04B35/5935
摘要： A process for making a densified silicon nitride article utilizing polysilanes or polysilazanes as a binder is described. The process involves blending of a silicon nitride composition with a polysilane or a polysilazane to form a mixture. The mixture is molded into an article. The article is then pyrolyzed in a non-oxidizing atmosphere and at a temperature sufficient to form a pyrolyzed article comprising amorphous silicon nitride and silicon carbide. The article is then sintered at a temperature equal to or greater than 1400.degree. C. to form a densified silicon nitride article.
摘要翻译：描述了使用聚硅烷或聚硅氮烷作为粘合剂来制造致密化的氮化硅制品的方法。该方法包括将氮化硅组合物与聚硅烷或聚硅氮烷混合以形成混合物。将混合物模制成制品。然后将该制品在非氧化性气氛中并在足以形成包含非晶氮化硅和碳化硅的热解制品的温度下热解。然后将该制品在等于或大于1400℃的温度下烧结以形成致密的氮化硅制品。

43. 发明授权

US5064789A Silicon nitride reinforced with molybdenum disilicide 失效
标题翻译：用二硅化钼增强的氮化硅
公开(公告)号：US5064789A
公开(公告)日：1991-11-12
申请号：US588874
申请日：1990-09-27
申请人： John J. Petrovic , Richard E. Honnell
发明人： John J. Petrovic , Richard E. Honnell
IPC分类号： C04B35/58 , C04B35/593
CPC分类号： C04B35/58092 , C04B35/593 , C04B35/645
摘要： Compositions of matter comprised of silicon nitride and molybdenum disilicide and methods of making the compositions, where the molybdenum disilicide is present in amounts ranging from about 5 to about 50 vol. %.
摘要翻译：由氮化硅和二硅化钼组成的物质的组成以及制备组合物的方法，其中二硅化钼以约5至约50体积％的量存在。％。

44. 发明授权

US5047186A Process for producing silicon nitride based articles of high fracture toughness and strength 失效
$Process for producing silicon nitride based articles of high fracture toughness and strength$
标题翻译：具有高断裂韧性和强度的氮化硅基制品的制造方法
公开(公告)号：US5047186A
公开(公告)日：1991-09-10
申请号：US458122
申请日：1989-12-28
申请人： Marvin Huckabee , Sergej-Tomislav Buljan , Jeffrey T. Neil
发明人： Marvin Huckabee , Sergej-Tomislav Buljan , Jeffrey T. Neil
IPC分类号： C04B35/593 , C04B35/80
CPC分类号： C04B35/593 , C04B35/806
摘要： A process for producing a silicon nitride-based article of improved fracture toughness and strength. The process involves densifying to at least 98% of theoretical density a mixture including (a) a bimodal silicon nitride powder blend consisting essentially of about 10-30% by weight of a first silicon nitride powder of an average particle size of about 0.2 .mu.m and a surface area of about 8-12 m.sup.2 /g, and about 70-90% by weight of a second silicon nitride powder of an average particle size of about 0.4-0.6 .mu.m and a surface area of about 2-4 m.sup.2 /g, (b) about 10-50 percent by volume, based on the volume of the densified article, of refractory whiskers or fibers having an aspect ratio of about 3-150 and having an equivalent diameter selected to produce in the densified article an equivalent diameter ratio of the whiskers or fibers to grains of silicon nitride of greater than 1.0, and (c) an effective amount of a suitable oxide densification aid. Optionally, the mixture may be blended with a binder and injection molded to form a green body, which then may be densified by, for example, hot isostatic pressing.
摘要翻译：一种制造具有改善的断裂韧性和强度的氮化硅基制品的方法。该方法包括将理论密度致密化至至少98％的混合物，包括（a）基本上由约10-30重量％的平均粒度约0.2μm的第一氮化硅粉末组成的双峰氮化硅粉末混合物约8-12m 2 / g的表面积和约70-90％重量的平均粒度约0.4-0.6μm的第二种氮化硅粉末和约2-4m2 / g，（b）基于致密化制品的体积约10-50体积％的具有约3-150的纵横比的具有等效直径的难熔晶须或纤维，其选择在致密化制品中产生等同物晶须或纤维与氮化硅颗粒的直径比大于1.0，和（c）有效量的合适的氧化物致密化助剂。任选地，混合物可以与粘合剂混合并注射成型以形成生坯，然后可以通过例如热等静压来致密化。

45. 发明授权

US4997604A Method for production of molded articles of silicon nitride 失效
标题翻译：氮化硅成型体的制造方法
公开(公告)号：US4997604A
公开(公告)日：1991-03-05
申请号：US457382
申请日：1989-12-27
申请人： Beat Hofer , Bernhard Einstein
发明人： Beat Hofer , Bernhard Einstein
IPC分类号： C04B35/591 , C04B35/593
CPC分类号： C04B35/591 , C04B35/5935
摘要： A reactively combined silicon nitride is produced in which the starting material is pure silicon powder or a powder mixture of pure silicon and its nitride. This material is subjected to cold isostatic pressing or a slip casting or diecasting process before it is brought into a hot isostatic mold. The reaction is triggered under a nitrogen pressure of initially 0.5-2.0 MPa and at a starting temperature of 1000.degree. C. During the reaction the pressure is raised to 4.9 MPa and the temperature to at most 1420.degree. C. This raising of pressure and temperature is carried out at least partially stepwise. Obtained thereby is a product having a degree of nitriding greater than 92%. With a cycle time of less than 24 hours, the process permits molded articles to be produced which have a wall thickness of more than 10 mm, the material being uniformly nitrided.
摘要翻译：产生反应性组合的氮化硅，其中起始材料是纯硅粉末或纯硅及其氮化物的粉末混合物。该材料在进入热等静压模具之前，经受冷等静压或压铸或压铸过程。反应在最初为0.5-2.0MPa的氮气压力和1000℃的起始温度下触发。在反应期间，压力升高至4.9MPa，温度升至至多1420℃。这种升高的压力和温度至少部分地逐步进行。由此获得的氮化程度大于92％的产品。循环时间小于24小时，该工艺允许生产具有大于10mm的壁厚的模制品，该材料被均匀氮化。

46. 发明授权

US4978645A Silicon nitride sintered body 失效
标题翻译：氮化硅烧结体
公开(公告)号：US4978645A
公开(公告)日：1990-12-18
申请号：US334553
申请日：1989-04-07
申请人： Yoshio Ukyo , Shigetaka Wada , Kazumasa Takatori
发明人： Yoshio Ukyo , Shigetaka Wada , Kazumasa Takatori
IPC分类号： C04B35/584 , C04B35/593
CPC分类号： C04B35/593 , C04B35/584 , C04B35/5935
摘要： A silicon nitride sintered body composed of .alpha.'-silicon nitride and .beta.'-silicon nitride, which are present in the ratio of 0.05-0.50 to 0.50-0.95 in terms of the peak strength ratio of X-ray diffraction, and have very small crystal grain size and specific compositions. The sintered body has high strength and high toughness and is superior in oxidation resistance.

47. 发明授权

US4940680A Silicon nitride sintered members 失效
标题翻译：氮化硅烧结体
公开(公告)号：US4940680A
公开(公告)日：1990-07-10
申请号：US247373
申请日：1988-09-21
申请人： Tomonori Takahashi
发明人： Tomonori Takahashi
IPC分类号： C04B35/584 , C04B35/593
CPC分类号： C04B35/593 , C04B35/584
摘要： A silicon nitride sintered member including a silicon nitride sintered body and a dense silicon nitride coating layer covering the surface of the silicon nitride sintered body. An intergranular phase of the silicon nitride sintered body is substantially composed of crystals.

48. 发明授权

US4931238A Method for manufacturing a sintered body with high density 失效
标题翻译：高密度烧结体的制造方法
公开(公告)号：US4931238A
公开(公告)日：1990-06-05
申请号：US203239
申请日：1988-06-06
申请人： Hiroaki Nishio , Takeshi Kawashima
发明人： Hiroaki Nishio , Takeshi Kawashima
IPC分类号： B22F3/10 , B22F3/14 , B22F3/15 , C04B35/593 , C04B35/638 , C04B35/645
CPC分类号： C04B35/638 , C04B35/6455
摘要： Method for manufacturing a sintered body with high density comprises: turning first powder into a first slurry by dispersing the first powder in a first dispersion medium composed mainly of substances capable of being extracted by supercritical fluid and forming a compact which contains the first dispersion medium, by casting the first slurry; turning second powder into a second slurry by dispersing the second powder in a second dispersion medium composed mainly of substances capable of being extracted by supercritical fluid, and forming a film layer by coating the surface of the compact with the second slurry; extracting and removing the substances contained in the compact and the substances contained in the film layer by means of the supercritical fluid; turning the film layer on the surface of the compact into an impermeable film layer to gas by heating the compact, from which the substances have been extracted and removed; and applying a hot isostatic pressing process to the compact, the film layer on the surface of the compact having been turned into the impermeable film layer.

49. 发明授权

US4920838A Method of cutting with ceramic cutting tool having improved toughness behavior 失效
标题翻译：具有改进的韧性行为的陶瓷切割工具的切割方法
公开(公告)号：US4920838A
公开(公告)日：1990-05-01
申请号：US349094
申请日：1989-05-09
申请人： Nils G. L. Brandt , Anders G. Thelin
发明人： Nils G. L. Brandt , Anders G. Thelin
IPC分类号： C04B35/111 , C04B35/584 , C04B35/593 , C04B35/80 , C04B35/81
CPC分类号： C04B35/80 , C04B35/111 , C04B35/593 , Y10T407/27 , Y10T408/5653 , Y10T408/78 , Y10T408/81 , Y10T409/303752 , Y10T82/10
摘要： This invention relates to a cutting tool material with improved toughness behavior. The improved toughness behavior is obtained by using carefully selected reinforcing materials. The objectives of this invention are realized by simultaneously utilizing additives resulting in different toughenings mechanisms. By the simultaneous utilization of different toughening additives, synergistic effects occur giving the tool excellent material properties. The tool material of the present invention comprises reinforcing whisker additives of one dimensional single crystals with preferably different diameter and aspect ratios, two dimensional single crystals with different thickness and aspect ratios, and, in combination therewith, phase transformation additives such as ZrO.sub.2.

50. 发明授权

US4904624A Silicon nitride with improved high temperature strength 失效
标题翻译：具有改善的高温强度的氮化硅
公开(公告)号：US4904624A
公开(公告)日：1990-02-27
申请号：US144458
申请日：1988-01-15
申请人： Russell L. Yeckley
发明人： Russell L. Yeckley
IPC分类号： C04B35/593
CPC分类号： C04B35/593
摘要： The flexural strength and stress rupture life of isostatically hot pressed silicon nitride containing between 1 and 12 weight percent of rare earth oxide and not more than 0.5 weight percent alumina is substantially increased by treating green bodies in flowing nitrogen at a temperature between 1000.degree. and 1500.degree. C. before degassing for the isostatic hot pressing. The iron content of the bodies is also reduced by this heat treatment, and this is believed to eliminate sources of fracture failure. Silicon nitride bodies with a flexural strength in excess of 525 MPa at 1370.degree. C. and with stress rupture lives reliably in excess of 200 hours at 300 MPa stress at 1370.degree. C. can be prepared in this way. The strain rates of silicon nitride under high temperature stress can also be reduced.
摘要翻译：含有1〜12重量％稀土氧化物和不超过0.5重量％氧化铝的等静压热压氮化硅的弯曲强度和应力断裂寿命通过在1000〜1500℃的温度下处理生态体在等离子体热压脱气前。通过这种热处理也减少了这些物体的铁含量，这被认为是消除了断裂破坏的原因。在1370℃下，弯曲强度超过525MPa，在1370℃下的应力断裂的应力断裂的可靠性超过200小时的氮化硅体可以以这种方式制备。氮化硅在高温应力下的应变速率也可以降低。

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