Production of silicon nitride sintered body
    63.
    发明授权
    Production of silicon nitride sintered body 失效
    生产氮化硅烧结体

    公开(公告)号:US4801414A

    公开(公告)日:1989-01-31

    申请号:US12160

    申请日:1987-02-09

    摘要: A process is disclosed for producing silicon nitride sintered bodies. The process comprises the steps of molding a formulated starting material of silicon nitride, firing a thus obtained molding to obtain a fired body having a desired shape, and then thermally treating the fired body in such an atmosphere that has an oxygen partial pressure higher than that in a firing atmosphere and suppresses a weight increment in oxidation to not more than 0.1 mg/cm.sup.2. Working may be done to obtain the desired shape of the fired body after the firing but before the thermal treatment.

    摘要翻译: 公开了一种用于生产氮化硅烧结体的方法。 该方法包括以下步骤:模制配制的氮化硅原料,焙烧如此获得的模制物,以获得具有所需形状的烧制体,然后在氧分压高于其中的氧气分压的气氛中对烧成体进行热处理。 在烧成气氛中,抑制氧化重量增加至0.1mg / cm 2以下。 可以进行工作以在烧制之后但是在热处理之前获得所需的烧制体的形状。

    Production of silicon nitride sintered body
    64.
    发明授权
    Production of silicon nitride sintered body 失效
    生产氮化硅烧结体

    公开(公告)号:US4747984A

    公开(公告)日:1988-05-31

    申请号:US932204

    申请日:1986-11-18

    CPC分类号: C04B35/584 C04B35/5935

    摘要: A process for manufacturing a silicon nitride sintered body comprises molding a mixed powder of a silicon nitride starting material and a sintering aid and firing a thus obtained molding. The firing is carried out in an N.sub.2 atmosphere or a mixed atmosphere of N.sub.2 and an inert gas to which CO.sub.2 or a mixed gas of CO.sub.2 and CO is added. Thereby, an O.sub.2 partial pressure is increased to restrain the evaporation of SiO.sub.2 and nitriding of SiO.sub.2 during the firing. The silicon nitride sintered body suffers almost no deterioration of the fired surface resulting from the evaporation of SiO.sub.2 and the nitriding of SiO.sub.2, and exhibits substantially equal four point bending strength and oxidation resistance with respect to the fired surface and the inside thereof.

    摘要翻译: 一种氮化硅烧结体的制造方法,其特征在于,将氮化硅原料和烧结助剂的混合粉末成形,烧成由此得到的成形体。 烧成是在N 2的气氛或N 2的混合气氛和CO 2或CO 2和CO的混合气体中添加的惰性气体中进行的。 由此,增加O2分压,以抑制SiO 2的蒸发和焙烧期间的SiO 2的氮化。 氮化硅烧结体几乎没有由于SiO 2的蒸发和SiO 2的氮化而引起的烧结表面的劣化,并且相对于烧结表面及其内部表现出大致相等的四点弯曲强度和抗氧化性。

    Method for producing spinel fine powders
    66.
    发明授权
    Method for producing spinel fine powders 失效
    制备尖晶石细粉的方法

    公开(公告)号:US4542112A

    公开(公告)日:1985-09-17

    申请号:US460912

    申请日:1983-01-25

    IPC分类号: C01F7/02 C01F7/16 C04B35/04

    摘要: Spinel fine powders having high purity suitable for raw materials for producing a dense and uniform spinel sintered body, are produced by hydrolyzing an alcohol solution of specifically defined magnesium alkoxides and aluminum alkoxides in a specific mixing ratio.

    摘要翻译: 通过以特定的混合比水解特定定义的烷氧化镁和醇铝的醇溶液来制备适用于生产致密且均匀的尖晶石烧结体的原料的高纯度的尖晶石细粉末。