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    • 4. 发明授权
    • Dense fine grained monotungsten carbide-transition metal cemented
carbide body and preparation thereof
    • 密集细晶碳化钨 - 过渡金属硬质合金体及其制备
    • US5773735A
    • 1998-06-30
    • US752513
    • 1996-11-20
    • Ellen M. DubenskyRobert T. Nilsson
    • Ellen M. DubenskyRobert T. Nilsson
    • B22F3/15C22C1/05C22C29/08C22C29/00
    • B22F3/156C22C1/051C22C29/08B22F2998/00
    • A cemented tungsten carbide body having a transition metal binder phase selected from the group consisting of iron, nickel and cobalt is formed, wherein the WC grains have an average WC grain size of at most about 0.5 micrometer in diameter and a maximum WC grain size of at most about 0.8 micrometer in diameter. Also, about 50 percent by volume of the WC grains in the body are angular grains and the body (1) contains an amount of the transition metal ranging from about 3 percent to about 18 percent by weight of the body, (2) is essentially free of grain growth inhibitors and (3) is essentially pore free. Said cemented tungsten carbide body is formed by mechanically mixing a source of WC with a source of transition metal, shaping the mixture into a porous body and sintering the porous body at a sintering temperature, superatmospheric pressure and time at temperature and time at superatmospheric pressure sufficient to form the cemented tungsten carbide body, wherein the sintering occurs without the formation of a liquid in the body and at least a portion of the time at superatmospheric pressure is at the sintering temperature.
    • 形成具有从铁,镍和钴组成的组中选择的过渡金属粘合剂相的硬质合金碳化物体,其中WC颗粒的平均WC晶粒尺寸直径至多为0.5微米,最大WC晶粒尺寸为 直径最大约为0.8微米。 另外,身体中大约50体积%的WC颗粒是角状颗粒,并且身体(1)含有一定量的过渡金属,其量约为本体重量的约3%至约18%,(2)本质上 没有晶粒生长抑制剂和(3)基本上是无孔的。 所述粘结碳化钨体通过将WC源与过渡金属源机械混合而形成,将混合物成形为多孔体,并在烧结温度,超大气压力和超高压下的时间和温度和时间下在足够大的压力下烧结多孔体 以形成粘结碳化钨体,其中在不在体内形成液体的情况下进行烧结,并且在超大气压下的至少一部分时间处于烧结温度。
    • 5. 发明授权
    • Methods for making WC-containing bodies
    • 制作含WC体的方法
    • US5612264A
    • 1997-03-18
    • US555944
    • 1995-11-13
    • Robert T. NilssonRichard T. FoxStephen D. Dunmead
    • Robert T. NilssonRichard T. FoxStephen D. Dunmead
    • C04B35/56
    • C04B35/6455C04B35/5607C04B35/5611C04B35/5622C04B35/5626C04B35/58007C04B35/645
    • A method of forming a low level carbon high-density tungsten carbide-containing material includes sintering a preform which contains tungsten carbide powder and has a composition such that the resulting sintered material has at most 6.05 weight percent tungsten-bound carbon based on the total weight of tungsten and tungsten-bound carbon. This low level of carbon may be achieved by, prior to the sintering step, oxidizing the tungsten carbide powder sufficiently to achieve the desired substoichiometric carbon level in the sintered product or by adding a carbon-lowering material selected from the group consisting of tungsten, ditungsten carbide, and tungsten oxide. Optionally, other materials can be present in the preform such as carbon-getter metals and compounds thereof. The carbon-getter metals are those metals of which the carbides thereof are more thermodynamically stable than monotungsten carbide.
    • 形成低碳碳高密度碳化钨的材料的方法包括烧结含有碳化钨粉末的预成型体,并且具有使得所得烧结材料基于总重量具有至多6.05重量%的钨结合碳的组成 的钨和钨结合的碳。 这种低水平的碳可以通过在烧结步骤之前充分氧化碳化钨粉末以达到烧结产品中所需的亚化学计量碳水平,或通过添加选自钨,二钨的碳的降低材料 碳化物和氧化钨。 任选地,其它材料可以存在于预成型体中,例如碳吸收剂金属及其化合物。 碳吸收剂金属是其碳化物比单碳化钨更具有热力学稳定性的金属。