利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

4 条记录 (耗时 0.016 秒)

    Pressureless sintering beryllium containing silicon carbide powder composition
    3.
    发明授权
    Pressureless sintering beryllium containing silicon carbide powder composition 失效
    无压烧结铍含碳化硅粉末组成

    公开(公告)号：US4172109A

    公开(公告)日：1979-10-23

    申请号：US937395

    申请日：1978-08-28

    申请人： Richard H. Smoak

    发明人： Richard H. Smoak

    IPC分类号： C04B35/565 ,  C04B35/56

    CPC分类号： C04B35/565

    摘要： A sinterable silicon carbide mixture is described which is prepared by mixing finely-divided silicon carbide containing between about 0.5 and about 5.0 percent by weight of excess carbon with a finely-divided beryllium-containing additive wherein the amount of beryllium in the mixture is equal to between about 0.03 and about 1.5 percent by weight of the powder. A dense silicon carbide ceramic product is prepared from the powder mixture by pressureless sintering wherein the article is initially shaped and subsequently sintered in a beryllium-containing atmosphere at a temperature from about 1950.degree. to about 2300.degree. C.

    摘要翻译： 描述了可烧结的碳化硅混合物，其通过将含有约0.5至约5.0重量％的过量碳的细碎碳化硅与细碎的含铍添加剂混合而制备，其中混合物中铍的量等于 在粉末的约0.03至约1.5重量％之间。 通过无压烧结从粉末混合物制备致密的碳化硅陶瓷产品，其中制品初始成型，随后在约1950℃至约2300℃的温度下在含铍的气氛中烧结。

    Method of producing a high density silicon carbide product
    4.
    发明授权
    Method of producing a high density silicon carbide product 失效
    生产高密度碳化硅产品的方法

    公开(公告)号：US4237085A

    公开(公告)日：1980-12-02

    申请号：US21403

    申请日：1979-03-19

    申请人： Richard H. Smoak

    发明人： Richard H. Smoak

    IPC分类号： C04B35/565 ,  C04B35/64 ,  C04B35/56

    CPC分类号： C04B35/64 ,  C04B35/565

    摘要： A method of pressureless sintering silicon carbide mixtures to obtain a sintered, dense product when the silicon carbide starting materials do not include a densification aid, such as boron, beryllium or aluminum, is described. The starting materials are mixtures containing predominantly particulate silicon carbide and include usually less than about 10 and, preferably, less than about 6 percent by weight of carbon in the form of elemental carbon or in the form of a carbon source material. The mixtures may also contain minor amounts of other additives, such as lubricants, surfactants or agglutinants, to aid in forming a compact, or green body, from the mixtures, or minor amounts of other ceramic materials depending upon the nature of the desired final product. The mixtures are formed into compacts, or green bodies, by known techniques. The powder compact is sintered under substantially pressureless conditions in a sintering atmosphere containing boron to produce a sintered product having a density of at least 85 percent and, preferably, greater than about 90 percent of the theoretical density of silicon carbide.

    摘要翻译： 描述了当碳化硅起始材料不包括致密化助剂如硼，铍或铝时，无压烧结碳化硅混合物以获得烧结致密产品的方法。 起始材料是主要包含颗粒状碳化硅的混合物，通常含有少于约10重量％，优选小于约6重量％的以元素碳形式或以碳源材料形式的碳。 混合物还可以含有少量的其它添加剂，例如润滑剂，表面活性剂或凝集剂，以帮助从混合物或少量其它陶瓷材料形成紧密或生坯，这取决于所需最终产品的性质 。 通过已知技术将混合物形成压实体或生坯体。 粉末压块在基本无压力的条件下在含硼的烧结气氛中烧结，以产生密度为碳化硅理论密度的至少85％，优选大于约90％的烧结产品。