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    • 103. 发明公开
    • 본질적으로 위스커가 없는 탄화규소 및 이의 제조방법
    • 硅碳纤维材料基材的脱模剂及其制备方法
    • KR1020040005676A
    • 2004-01-16
    • KR1020030046304
    • 2003-07-09
    • 어드밴스드 콤포지트 머티리얼즈, 엘엘씨
    • 안기어데렉제이로즈제임스에프로저스윌리암엠
    • C01B31/36
    • D01F9/08C04B35/62281C04B35/62675C04B2235/3208C04B2235/3272C04B2235/3418C04B2235/448C04B2235/449C04B2235/5248C04B2235/5256C04B2235/526C04B2235/5264C04B2235/72C04B2235/722C04B2235/723C04B2235/726C04B2235/77Y10T428/249921Y10T428/2913Y10T442/638C01B32/956
    • PURPOSE: Discontinuous silicon carbide fibers that retain the morphology of the carbon source, respond to microwave energy, and are essentially devoid of whiskers are provided. CONSTITUTION: The method for making discontinuous silicon carbide fibers essentially devoid of whiskers, comprises the steps of: (a) admixing discontinuous isotropic carbon fiber and silica to form a fiber/silica mixture; (b) drying the fiber/silica mixture; and (c) reacting the dried fiber/silica mixture in an essentially inert atmosphere in a resistance furnace for a time and at a temperature sufficient to form the discontinuous silicon carbide fibers essentially devoid of whiskers, wherein the discontinuous isotropic carbon fiber is isotropic pitch carbon fiber, wherein the silica is present in a molar excess relative to the discontinuous isotropic carbon fibers, wherein the essentially inert atmosphere comprises argon, and wherein the discontinuous isotropic carbon fibers has a sulfur concentration greater than about 0.25 wt.%. Discontinuous silicon carbide fibers essentially devoid of whiskers are characterized in that the fibers are prepared by (a) admixing discontinuous isotropic carbon fiber and silica to form a fiber/silica mixture; (b) drying the fiber/silica mixture; and (c) heating the dried fiber/silica mixture in a resistance furnace in an essentially inert atmosphere for a time and at a temperature sufficient to form the discontinuous silicon carbide fibers.
    • 目的:提供保持碳源形态的不连续碳化硅纤维,对微波能量的响应,并且基本上没有晶须。 构成:制造基本不含晶须的不连续碳化硅纤维的方法包括以下步骤:(a)混合不连续的各向同性碳纤维和二氧化硅以形成纤维/二氧化硅混合物; (b)干燥纤维/二氧化硅混合物; 和(c)将干燥的纤维/二氧化硅混合物在电阻炉中在基本上惰性气氛中反应一段时间并且足以形成基本上不含晶须的不连续碳化硅纤维的温度,其中不连续的各向同性碳纤维是各向同性沥青碳 纤维,其中所述二氧化硅相对于所述不连续的各向同性碳纤维以摩尔过量存在,其中所述基本上惰性的气氛包含氩,并且其中所述不连续的各向同性的碳纤维具有大于约0.25重量%的硫浓度。 基本上不含晶须的不连续的碳化硅纤维的特征在于,通过(a)混合不连续的各向同性的碳纤维和二氧化硅以形成纤维/二氧化硅混合物来制备纤维; (b)干燥纤维/二氧化硅混合物; 和(c)在电阻炉中在基本上惰性气氛中加热干燥的纤维/二氧化硅混合物一段时间并在足以形成不连续的碳化硅纤维的温度下进行。