公开(公告)号：US4886767A

公开(公告)日：1989-12-12

申请号：US152716

申请日：1988-02-05

申请人： Yasuhiro Goto ,  Takeyuki Yonezawa ,  Yoshiyuki Ohnuma

发明人： Yasuhiro Goto ,  Takeyuki Yonezawa ,  Yoshiyuki Ohnuma

IPC分类号： C04B35/584 ,  C04B35/593

CPC分类号： C04B35/584 ,  C04B35/593

摘要： A silicon nitride-ceramic is composed of a sintered body including silicon nitride and an additive, and has a columnar crystal of .beta. type silicon nitride substantially parallel to one plane. A method for manufacturing a silicon nitride-ceramic comprises the steps of forming first powder including a needle-shaped crystal of .beta. type silicon nitride by mixing the needle-shaped crystal of the .beta. type silicon nitride with second silicon nitride powder mainly of .alpha. type including an additive, or by heating the second silicon nitride powder at temperature 1500.degree. to 1750 .degree. C. in advance; and sintering the first powder at a predetermined temperature under non-oxidation atmosphere.

摘要翻译： 氮化硅陶瓷由包括氮化硅和添加剂的烧结体组成，并且具有基本上平行于一个平面的β型氮化硅的柱状晶体。 制造氮化硅陶瓷的方法包括以下步骤：通过将β型氮化硅的针状晶体与主要为α型的第二氮化硅粉末混合，形成包括β型氮化硅的针状晶体的第一粉末，包括 或通过预先在1500℃至1750℃下加热第二氮化硅粉末; 并在非氧化气氛下在预定温度下烧结第一种粉末。

公开(公告)号：US4853299A

公开(公告)日：1989-08-01

申请号：US903141

申请日：1986-09-03

申请人： Toshiaki Mizutani ,  Takeyuki Yonezawa ,  Hiroshi Inoue ,  Akihiko Tsuge ,  Yoshiyuki Ohnuma

发明人： Toshiaki Mizutani ,  Takeyuki Yonezawa ,  Hiroshi Inoue ,  Akihiko Tsuge ,  Yoshiyuki Ohnuma

IPC分类号： C04B35/565

CPC分类号： C04B35/565 ,  Y10S264/36

摘要： A silicon carbide sintered body containing not less than 0.03% by weight of boron, a total of not more than 0.3% by weight of metallic element impurities including the boron, not more than 1.0% by weight of free carbon, a total of not more than 0.15% by weight of non-metal impurities other than the free carbon, and the balance essentially consisting of silicon carbide, and having a density of not less 3.10 g/cm.sup.3. The sintered body is manufactured by heating a molding of a mixture containing a silicon carbide powder, a boron-containing sintering assistant, and a carbon-containing oxygen scavenger to a sintering temperature. The molded body is maintained at a temperature lower than the sintering temperature during the heating process until an oxide film covering the silicon carbide powder is substantially removed by the oxygen scavenger, and the molded body is then sintered at the sintering temperature under a non-pressurized condition.

摘要翻译： 含有不少于0.03重量％的硼，总计不超过0.3重量％的包含硼的金属元素杂质，不超过1.0重量％游离碳的碳化硅烧结体，总计不超过 超过0.15重量％的除游离碳以外的非金属杂质，余量基本上由碳化硅组成，密度不小于3.10g / cm 3。 通过将含有碳化硅粉末，含硼烧结助剂和含碳氧清除剂的混合物的成型加热至烧结温度来制造烧结体。 成型体在加热过程中保持在低于烧结温度的温度，直到氧清除剂基本上除去覆盖碳化硅粉末的氧化膜，然后在未加压的烧结温度下将成型体烧结 条件。

公开(公告)号：US06960618B2

公开(公告)日：2005-11-01

申请号：US10646829

申请日：2003-08-25

申请人： Yoshiyuki Ohnuma ,  Junichiro Mori ,  Hideki Tosaki

发明人： Yoshiyuki Ohnuma ,  Junichiro Mori ,  Hideki Tosaki

IPC分类号： C08G18/00 ,  C08G18/40 ,  C08G101/00 ,  C08J9/12 ,  C08J9/04

CPC分类号： C08J9/122 ,  C08G18/4018 ,  C08G2101/0025 ,  C08G2101/005 ,  C08J2203/08 ,  C08J2205/052 ,  C08J2205/10 ,  C08J2375/04

摘要： The present invention relates to a preparation method for low-density polyurethane foam excelling in the flame retardance and the dimensional stability, wherein rigid polyurethane foam having the average value for the ratio of lengthwise direction diameter/cross direction diameter of cells being 1.0 to 1.4 and the density of 20 to 40 kg/m3 is prepared by combining, as blowing agent, carbon dioxide generated in the reaction between water and polyisocyanate and carbon dioxide under supercritical state, subcritical state or liquid state, and by adding said water and said carbon dioxide under liquid state into said polyol component prior to mixing the polyisocyanate component and the polyol component, and to rigid polyurethane foam obtained by said method.

摘要翻译： 本发明涉及一种阻燃性和尺寸稳定性优异的低密度聚氨酯泡沫塑料的制造方法，其中硬质聚氨酯泡沫体的长度方向直径/横截面直径比的平均值为1.0〜1.4， 通过在超临界状态，亚临界状态或液态下将作为发泡剂的水与多异氰酸酯和二氧化碳之间的反应中产生的二氧化碳组合，制备20〜40kg / m 3的密度， 在混合多异氰酸酯组分和多元醇组分之前，将所述水和所述二氧化碳在液态下加入到所述多元醇组分中，以及通过所述方法获得的硬质聚氨酯泡沫。

公开(公告)号：US5187127A

公开(公告)日：1993-02-16

申请号：US807759

申请日：1991-12-17

申请人： Yasuhiro Goto ,  Takeyuki Yonezawa ,  Yoshiyuki Ohnuma ,  Jen Ando

发明人： Yasuhiro Goto ,  Takeyuki Yonezawa ,  Yoshiyuki Ohnuma ,  Jen Ando

IPC分类号： C04B35/584 ,  C04B35/80

CPC分类号： C04B35/584 ,  C04B35/593 ,  C04B35/806 ,  C04B2235/3206 ,  C04B2235/3217 ,  C04B2235/3222 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3232 ,  C04B2235/3244 ,  C04B2235/3249 ,  C04B2235/3839 ,  C04B2235/3843 ,  C04B2235/3865 ,  C04B2235/3878 ,  C04B2235/3882 ,  C04B2235/3886 ,  C04B2235/5244 ,  C04B2235/5256 ,  C04B2235/526 ,  C04B2235/5268 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/656 ,  C04B2235/77 ,  C04B2235/96

摘要： According to the present invention, there is provided a fiber-reinforced silicon nitride ceramic prepared by sintering a starting composition containing silicon nitride, at least one sintering additive and silicon carbide fiber or a fiber containing silicon carbide as a major constituent (to be referred to as a silicon carbide fiber hereinafter), characterized in that said silicon carbide fiber has a length of 200 .mu.m or more, and is contained 5 to 50 wt %, and said sintering additive is contained 0.1 to 30 wt % and is selected from the group consisting of an oxide, a nitride, and a carbide of titanium or zirconium, a composite oxide of titanium and zirconium, magnesia, and spinel. When the contents of the fibers and the sintering addtives fall within the ranges according to the present invention, a high strength and a large toughness value are simultaneously obtained.

摘要翻译： 根据本发明，提供了一种通过烧结含有氮化硅，至少一种烧结添加剂和碳化硅纤维或含有碳化硅作为主要成分的纤维的起始组合物制备的纤维增强氮化硅陶瓷（将被称为 作为以下的碳化硅纤维），其特征在于，所述碳化硅纤维的长度为200μm以上，含有5〜50重量％，所述烧结助剂为0.1〜30重量％，选自 由钛或锆的氧化物，氮化物和碳化物，钛和锆的复合氧化物，氧化镁和尖晶石组成的组。 当纤维和烧结添加剂的含量在本发明的范围内时，同时获得高强度和大的韧性值。

公开(公告)号：US5026737A

公开(公告)日：1991-06-25

申请号：US440210

申请日：1989-11-22

申请人： Yoshiyuki Ohnuma ,  Norio Tanaka

发明人： Yoshiyuki Ohnuma ,  Norio Tanaka

IPC分类号： C08J9/14 ,  C08G18/02 ,  C08G18/16 ,  C08G18/18 ,  C08G18/20 ,  C08G18/22 ,  C08G18/42 ,  C08G101/00

CPC分类号： C08G18/4211 ,  C08G18/163 ,  C08G18/2036 ,  C08G2101/00 ,  C08G2105/02

摘要： A process for producing a urethane-modified polyisocyanurate foam comprises mixing a polyisocyanate component, a polyl component containing an aromatic polyester polyol, a catalyst, a foaming agent, a surfactant and other additives under high pressure in a mixing head and then spraying the resultant mixture to expand the foaming ingredient therein. The process uses, as the catalyst, at least three compounds of N,N',N"-tris(dimethylaminopropyl)-S-hexahydrotriazine, an alkali metal carboxylate and a lead compound in combination.

摘要翻译： 制备氨基甲酸酯改性的聚异氰脲酸酯泡沫的方法包括在混合头中将多异氰酸酯组分，含有芳族聚酯多元醇的多元醇组分，催化剂，发泡剂，表面活性剂和其它添加剂在高压下混合，然后将所得混合物 以扩大其中的发泡成分。 该方法组合使用N，N'，N“ - 三（二甲基氨基丙基）-S-六氢三嗪，碱金属羧酸盐和铅化合物的至少三种化合物作为催化剂。