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    • 50. 发明授权
    • Preparing refractory metal boride powder
    • 制备难熔金属硼化物粉末
    • US4233277A
    • 1980-11-11
    • US546837
    • 1975-02-03
    • Robert S. Sheppard
    • Robert S. Sheppard
    • B01J19/08C01B35/04
    • C01B35/04
    • The preparation of refractory metal borides of Group 4b of the Periodic Table of the Elements by reaction in the vapor phase of the corresponding metal halide, e.g., metal chloride, with a boron source reactant in the presence of hydrogen in a reactor is described. Reactants are introduced into a reactant mixing zone containing hydrogen through reactant inlet assembly means. Refractory metal boride product deposits on the exposed surfaces of the reactant inlet assembly means are reduced significantly by introducing metal halide reactant and substantially anhydrous hydrogen halide into the hydrogen stream upstream of the boron source reactant while introducing boron source reactant mixed with inert carrier gas, e.g., argon, into said hydrogen stream downstream of the metal halide and hydrogen halide streams.
    • 描述了通过在反应器中的氢存在下,在相应的金属卤化物例如金属氯化物的气相与硼源反应物的反应中制备元素周期表第4b族的难熔金属硼化物。 将反应物通过反应物入口组装装置引入含有氢气的反应物混合区。 通过将金属卤化物反应物和基本上无水的卤化氢引入到硼源反应物上游的氢气流中,同时引入与惰性载气混合的硼源反应物,例如,将反应物入口装置的暴露表面上的耐火金属硼化物产物沉积物显着减少,例如 氩气流入金属卤化物和卤化氢物流下游的氢气流中。