Method for manufacturing silicon carbide bodies
    21.
    发明授权
    Method for manufacturing silicon carbide bodies 失效
    碳化硅体制造方法

    公开(公告)号:US4154787A

    公开(公告)日:1979-05-15

    申请号:US921402

    申请日:1978-07-03

    申请人: Wendel G. Brown

    发明人: Wendel G. Brown

    CPC分类号: C04B35/573

    摘要: In accordance with the invention there is provided a method for manufacturing a reaction bonded silicon carbide body by heating, in a vacuum or an inert atmosphere, to at least the melting temperature of elemental silicon, a porous compact consisting essentially of a substantially uniform mixture of silicon carbide grain and finely divided carbon while said compact is in intimate surface-to-surface contact with a mixture of finely divided elemental silicon and a small amount of finely divided, uniformly distributed carbon, such silicon-carbon mixture preferably also being in the form of a compact. Upon such heating, a portion of the elemental silicon in the silicon-carbon mixture reacts with the carbon therein to form a friable, highly porous matrix of silicon carbide which functions to guide the flow of the remaining elemental silicon into the porous silicon carbide-carbon compact where it reacts with the carbon therein to form additional silicon carbide thereby to convert the compact to a reaction bonded silicon carbide body.

    摘要翻译: 根据本发明,提供了一种通过在真空或惰性气氛中加热到元素硅的至少熔融温度来制造反应结合碳化硅体的方法,该多孔压块基本上由基本均匀的混合物 碳化硅颗粒和细碎碳,而所述压块与细分散的元素硅和少量细分散的均匀分布的碳的混合物紧密地表面接触地接触,这种硅 - 碳混合物优选也是形式 的小巧。 在这种加热下,硅 - 碳混合物中的一部分硅元素与其中的碳反应形成易碎的,高度多孔的碳化硅基体,其功能是将剩余元素硅的流动引导到多孔碳化硅 - 碳 其中它与其中的碳反应以形成额外的碳化硅,从而将压块转化为反应结合的碳化硅体。

    Method for manufacturing heat-resistant reinforced composite materials
    22.
    发明授权
    Method for manufacturing heat-resistant reinforced composite materials 失效
    制造耐热增强复合材料的方法

    公开(公告)号:US4097293A

    公开(公告)日:1978-06-27

    申请号:US708354

    申请日:1976-07-26

    摘要: A method for manufacturing heat-resistant reinforced composite materials having a fibrous structure which comprises mixing 99.8 to 90 percent by weight of a first component selected from the group consisting of the nitrides or carbides of aluminum, silicon and boron and mixtures thereof and 0.2 to 10 percent by weight of a second component selected from the group consisting of the rare earth oxides and mixtures thereof, molding the mixture into a desired shape, and sintering the molded mass to create a fibrous structure therein, said first component being 0.2 to 3.0 microns in average particle size, and said second component being 0.1 to 2.0 microns in average particle size.

    摘要翻译: 一种制造具有纤维结构的耐热增强复合材料的方法,其包括将99.8-90%重量的选自由铝,硅和硼的氮化物或碳化物及其混合物组成的组中的第一组分和0.2至10 选自由稀土氧化物及其混合物组成的组的第二组分的重量百分比,将混合物成型为所需形状,并烧结成型物质以在其中形成纤维结构,所述第一组分为0.2-3.0微米 平均粒径,所述第二成分的平均粒径为0.1〜2.0微米。

    Method of making a sulphide ceramic body
    23.
    发明授权
    Method of making a sulphide ceramic body 失效
    制造硫化物陶瓷体的方法

    公开(公告)号:US4041140A

    公开(公告)日:1977-08-09

    申请号:US489048

    申请日:1974-07-16

    摘要: A method of making a polycrystalline sulphide ceramic body by sulphurizing an oxide material in a carbon disulphide atmosphere at a temperature in the range of 400-1000.degree. C and less than the transforming temperature of the sulphide, which transforming temperature represents either the decomposition temperature or the sublimation temperature inherent to the sulphide. One of the advantages of this method is that sulphides can be easily made by the very strong reduction action of carbon disulphide. This application also relates to sulphides made thereby.

    摘要翻译: 通过在二硫化碳气氛中在400-1000℃的温度和小于硫化物的转化温度下硫化氧化物材料来制造多晶硫化物陶瓷体的方法,该转化温度表示分解温度或 硫化物固有的升华温度。 该方法的优点之一是可以通过二硫化碳的非常强的还原作用容易地制备硫化物。 本申请还涉及由此制成的硫化物。

    Si.sub.3 N.sub.4 formed by nitridation of sintered silicon compact
containing boron
    24.
    发明授权
    Si.sub.3 N.sub.4 formed by nitridation of sintered silicon compact containing boron 失效
    Si {hd 3 {b N {HD 4 {B通过氮化烧结硅压电体形成硼

    公开(公告)号:US4017319A

    公开(公告)日:1977-04-12

    申请号:US646967

    申请日:1976-01-06

    CPC分类号: C04B35/591

    摘要: A polycrystalline silicon nitride body is produced by shaping a particulate mixture of silicon powder and boron into a green body, sintering the body to a density ranging from 60% to 75% of the theoretical density of silicon, said sintered body having pores which are interconnecting and open to the surface of the body, and reacting said sintered body with gaseous nitrogen to convert it to silicon nitride.

    摘要翻译: 通过将硅粉末和硼的颗粒状混合物成形为生坯,将本体烧结至硅理论密度的60%至75%的密度来制造多晶氮化硅体,所述烧结体具有互连的孔 并且向身体的表面开口,并使所述烧结体与气态氮反应以将其转化成氮化硅。

    Method of making ceramic sintered body
    25.
    发明授权
    Method of making ceramic sintered body 失效
    制造陶瓷烧结体的方法

    公开(公告)号:US3886254A

    公开(公告)日:1975-05-27

    申请号:US40014773

    申请日:1973-09-24

    申请人: NGK SPARK PLUG CO

    摘要: A method of making a ceramic sintered body, comprising preparing a powder-mixture consisting of 40 to 80 percent by weight of alumina with or without replacing not more than 2 percent by weight by a grain growth inhibitor, 16 to 40 percent by weight of titanium carbide and 4 to 20 percent by weight of metallic titanium, the total being 100 percent by weight, and hot-pressing said mixture. The mixture is not subjected to a calcination in nonoxidizing atmosphere at a temperature of 600*C to 1,000*C as previously proposed by the inventors, but it is directly subjected to hot-press forming at a high temperature under a high pressure.

    摘要翻译: 一种陶瓷烧结体的制造方法,其特征在于,包括:将由40〜80重量%的氧化铝组成的粉末混合物制成粉末混合物,所述氧化铝含有或不含有不超过2重量%的晶粒生长抑制剂,16〜40重量%的钛 碳化物和4〜20重量%的金属钛,总计为100重量%,并热压所述混合物。 如本发明人先前提出的那样,在600℃〜1000℃的温度下,在非氧化性气氛中不进行煅烧,在高压下直接进行热压成形。

    Lens quality of die steel
    29.
    发明授权
    Lens quality of die steel 失效
    模具钢镜片质量

    公开(公告)号:US4171233A

    公开(公告)日:1979-10-16

    申请号:US908419

    申请日:1978-05-22

    CPC分类号: C22C38/40 C22C38/44 C22C38/54

    摘要: A die steel having high hardenability, high hardness, good toughness and capable of achieving a high polished surface flatness in the air or oil quenched and tempered condition. Such steel is ideally suited as a die steel for lens quality and photo-etching applications. The unique combination of properties is accomplished through a careful balancing of the chemistry, particularly control of those elemental additions which promote segregation. Within the broad chemistry limits, by weight, of carbon 0.3 to 0.8%, and the maximum quantities of manganese 3.0%, phosphorus 0.025%, sulfur 0.025%, silicon 2.0%, nickel 4.0%, cobalt 4.0%, chromium 3.0%, vanadium 1.0%, molybdenum 1.5%, tungsten 1.5%, niobium 0.1%, titanium 0.5%, aluminum 0.10%, optionally boron between 0.0005 and 0.012%, balance iron, the desired polishability can be achieved through adherence to the equation:Surface Roughness (.mu.-inch)=Boron factor [7.07-12.5(% C)+0.72(% Mn)+0.45(% Si)-2.9 (% Ni)+1.13(% Ni).sup.2 +0.87(% Cr)+2.1(% V)+1.12 (% Mo)+0.84(% W)+14(% Nb)], where the calculated Surface Roughness is no greater than 2.65 .mu.-inch. The Boron factor is 1.0 when boron is not present in the above given range, and 1.74 when boron is present.

    摘要翻译: 具有高淬透性,高硬度,良好韧性并能够在空气或油淬火和回火状态下实现高抛光表面平整度的模具钢。 这种钢理想地适用于用于透镜质量和光蚀刻应用的模具钢。 特性的独特组合是通过仔细平衡化学成分,特别是控制促进分离的元素添加来实现的。 在化学范围宽的范围内,0.3〜0.8%的碳,最大锰量3.0%,磷0.025%,硫0.025%,硅2.0%,镍4.0%,钴4.0%,铬3.0%,钒 1.0%,钼1.5%,钨1.5%,铌0.1%,钛0.5%,铝0.10%,任选的硼在0.0005和0.012%之间,余量为铁,所需的抛光性可以通过遵循以下等式实现: