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公开(公告)号：US5833917A
公开(公告)日：1998-11-10
申请号：US879484
申请日：1997-06-19
申请人： Keiichiro Watanabe , Youky Bessyo
发明人： Keiichiro Watanabe , Youky Bessyo
IPC分类号： C04B35/626 , C04B35/584 , C04B35/593 , C03B15/02 , C04B35/58
CPC分类号： C04B35/5935
摘要： In a process for producing a silicon nitride sintered material, a silicon nitride raw material powder selected from raw material powder lots such that the silicon nitride raw material powder has a dispersion .delta.N.beta..sub.1 of weight fraction of .beta.-silicon nitride, of 65% or less, is used. A process for producing a silicon nitride sintered material controls the firing conditions so that the raw material being fired gives, at any stage of firing, a dispersion .delta.N.beta..sub.2 of weight fraction of .beta.-silicon nitride, of 65% or less between the surface portion and the central portion. The first process allows for production of a silicon nitride sintered material having excellent properties in high-temperature strength, etc., at a high reproducibility and stability. The second process allows for production, of in any production batch, a silicon nitride sintered material very low in scattering of properties (e.g., density and strength) between the central portion and the surface portion.
摘要翻译： 在制造氮化硅烧结体的方法中，选自原料粉末批料的氮化硅原料粉末，使得氮化硅原料粉末具有65％的氮化硅原料粉末的重量分数的分散度Nβ1， 或更少。 一种制造氮化硅烧结材料的方法控制烧制条件，使烧制的原料在任何烧成阶段得到β-硅氮化物重量分数的分散体δNβ2在65％ 表面部分和中心部分。 第一种方法允许以高再现性和稳定性生产具有优异的高温强度等性能的氮化硅烧结材料。 第二种方法允许在任何生产批次中生产在中心部分和表面部分之间非常低的散射特性（例如密度和强度）的氮化硅烧结材料。
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公开(公告)号：US5691261A
公开(公告)日：1997-11-25
申请号：US589171
申请日：1996-01-22
IPC分类号： C04B35/626 , C04B35/593 , C04B35/587
CPC分类号： C04B35/5935
摘要： A silicon nitride ceramic possessing excellent strength of the surface, including a silicon nitride and a rare earth oxide compound and being characterized in that the ratio of the transverse rupture strength, at room temperature, of the fired surface used as a tensile surface to the transverse rupture strength, at room temperature, of the worked surface used as a tensile surface subjected to working so as to have a surface roughness of R.sub.max 0.8 .mu.m or less is 0.7 or more, and the strength ratio is satisfied even when any portion besides the fired surface is utilized as the tensile surface to be worked to have a surface roughness of R.sub.max 0.8 .mu.m or less. The present invention also provides a process for producing a silicon nitride ceramic including the steps of: (1) mixing .alpha.-Si.sub.3 N.sub.4 powder and .beta.-Si.sub.3 N.sub.4 powder to obtain a raw material powder which satisfies the formula 0.05.ltoreq..beta./.alpha.+.beta..ltoreq.0.50, in which .alpha. refers to the weight of .alpha.-Si.sub.3 N.sub.4 powder and .beta. refers to the weight of .beta.-Si.sub.3 N.sub.4 powder; (2) mixing at least one sintering aid with the raw material powder; (3) forming the powder mixture to give a compact; and (4) firing the compact at a temperature ranging from 1800.degree. to 2000.degree. C. under a nitrogen atmosphere having an atmospheric pressure of at least 1 atm.
摘要翻译： 具有优异的表面强度的氮化硅陶瓷，包括氮化硅和稀土氧化物，其特征在于，用作拉伸表面的烧结表面的横向断裂强度与横向断裂强度之比 作为经受加工的表面粗糙度Rmax为0.8μm以下的作为拉伸面的加工面的室温下的断裂强度为0.7以上，即使在除了 作为待加工的拉伸面，具有Rmax0.8μm以下的表面粗糙度。 本发明还提供了一种制造氮化硅陶瓷的方法，包括以下步骤：（1）将α-Si 3 N 4粉末和β-Si 3 N 4粉末混合以获得满足公式0.05 /β/α+β
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公开(公告)号：US5089468A
公开(公告)日：1992-02-18
申请号：US501723
申请日：1990-03-28
申请人： Hitoshi Yoshida , Hitoshi Sakai , Shuichiro Oki , Keiichiro Watanabe , Manabu Yoshida , Toshio Oda
发明人： Hitoshi Yoshida , Hitoshi Sakai , Shuichiro Oki , Keiichiro Watanabe , Manabu Yoshida , Toshio Oda
CPC分类号： H01L39/2419 , C04B35/4521 , Y10S505/741 , Y10S505/742
摘要： The present process for producing a Bi-based superconducting oxide includes the steps of molding a material powder and subjecting the molded article to partial melting and then to crystallization in the presence of oxygen. In that case, the molded article is annealed, after the partial melting, to the crystallization temperature and subjected to crystallization at that temperature. Also, the article after the crystallization is cooled and the cooled article is heat-treated in an inert gas atmosphere. According to the above process, there can be obtained a Bi-based superconducting oxide having excellent superconducting properties.
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公开(公告)号：US5030398A
公开(公告)日：1991-07-09
申请号：US320629
申请日：1989-03-08
IPC分类号： B01J21/14 , B01J35/04 , C04B35/195 , C04B38/00
CPC分类号： B01J35/04 , B01J21/14 , C04B35/195 , C04B38/0006 , Y10T428/24149
摘要： Cordierite honeycomb structural bodies having coefficients of thermal expansion of not more than 1.0x10.sup.-6, an improved thermal shock resistance, a very small leakage amount and an improved heat exchanging efficiency are provided by using very fine particles of kaolin and talc to restrict a total pore volume of a given pore diameter to a given range. The cordierite honeycomb structural bodies are useful in broader fields than conventional ones.
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55.发明授权
公开(公告)号：US4923308A
公开(公告)日：1990-05-08
申请号：US334133
申请日：1989-04-06
IPC分类号： G01K11/00 , G01N23/225
CPC分类号： G01K11/003
摘要： A process for determining a relative temperature distribution at a surface of a high temperature member to be used in a gas containing oxygen at high temperatures is disclosed. The process comprises the step of determining the relative surface temperature distribution of the member by measuring concentrations of oxygen at the surface of the member, which surface is composed of silicon carbide or silicon nitride. The process may also include the step of quantitatively determining a distribution of temperatures at the surface of the member by measuring concentrations of oxygen at the surface of the member, determining a relationship between temperatures and concentrations of oxygen on a surface of a standard member, and comparing the measured oxygen concentrations at the surface of the member with those of a standard member with reference to this relationship.
摘要翻译： 公开了一种用于确定在高温下含氧气体中使用的高温部件表面的相对温度分布的方法。 该方法包括通过测量构件表面上的氧的浓度来确定构件的相对表面温度分布的步骤，该表面由碳化硅或氮化硅构成。 该方法还可以包括通过测量构件表面处的氧浓度，确定标准构件的表面上的温度和氧浓度之间的关系来定量地确定构件表面处的温度分布的步骤，以及 参考该关系将成员表面上测量的氧浓度与标准成分的氧浓度进行比较。
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56.发明授权Catalyst carrier of cordierite honeycomb structure and method of producing the same 失效堇青石蜂窝结构催化剂载体及其制备方法
公开(公告)号：US4772580A
公开(公告)日：1988-09-20
申请号：US936501
申请日：1986-12-01
IPC分类号： B01J35/04 , C04B35/195 , C04B38/00 , B01J32/00
CPC分类号： B01J35/04 , C04B35/195 , C04B38/0006 , Y10T428/24149
摘要： Catalyst carriers made of cordierite honeycomb structures having low thermal expansion, porosities of not exceeding 30%, high strengths and thin partition walls with high cell density or low cell density are provided by using very fine particles of kaoline and talc which are considered heretofore disadvantageous for producing such catalyst carriers. The catalyst carriers are useful in a broader use field than conventional ones, particularly as catalyst carriers for purifying exhaust gases exited from automobile engines.
摘要翻译： 通过使用非常细微的高岭土和滑石颗粒，提供了具有低热膨胀，孔隙率不超过30％，高强度和高细胞密度或细胞密度低的薄隔壁的催化剂载体，其被认为是不利于 生产这种催化剂载体。 催化剂载体在比现有技术更广泛的应用领域中是有用的，特别是作为用于净化从汽车发动机排出的废气的催化剂载体。
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公开(公告)号：US4722916A
公开(公告)日：1988-02-02
申请号：US861703
申请日：1986-05-12
IPC分类号： C04B35/195 , C04B35/18 , C04B35/20
CPC分类号： C04B35/195
摘要： Cordierite series dense and low expansion ceramics have excellent thermal shock resistance property, being airtight, heat resistant and having high dimensional stability at high temperatures can be achieved by incorporating 2-10% by weight of P.sub.2 O.sub.5 in the cordierite ceramic and acid treating the fired or sintered body to selectively remove P.sub.2 O.sub.5 to primarily result in an amount of 0.1% by weight of P.sub.2 O.sub.5 remaining in the sintered body.
摘要翻译： 堇青石系列致密低膨胀陶瓷具有优异的耐热冲击性，气密性，耐热性和在高温下具有高尺寸稳定性可以通过在堇青石陶瓷中掺入2-10重量％的P2O5和酸处理烧制的或 烧结体，以选择性地除去P2O5，主要产生残留在烧结体中的量为0.1重量％的P 2 O 5。
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