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    • 10. 发明专利
    • Tungsten carbide powder having nano particle size and its manufacturing method
    • 具有纳米颗粒尺寸的碳纳米管粉及其制造方法
    • JP2005335997A
    • 2005-12-08
    • JP2004155623
    • 2004-05-26
    • Allied Material Corp株式会社アライドマテリアル
    • YAMAMOTO RYOJIMIZUKAMI MASAHIKOASADA NOBUAKI
    • C01B32/949C01B31/34
    • PROBLEM TO BE SOLVED: To provide a tungsten powder having an average particle size of 100 nm or smaller from which hard materials such as a cemented alloy, a tungsten carbide sintered material, and a composite ceramic material having a higher hardness and a higher strength can be obtained, and its manufacturing method. SOLUTION: The method of manufacturing a nano particle size tungsten powder for obtaining a tungsten carbide powder, of which the total carbon amount is 6.13±0.30 mass%, the free carbon amount is 0.30 mass% or less, the oxygen amount is 0.7 mass% or less, the iron amount is 200 ppm or less, and the average particle size is 100 nm or smaller; is provided with a first heat treatment process in which a mixture of a micro tungsten oxide (WO 3 or WO 2.90 ) powder and a carbon powder is heated to 1,050-1,200°C in N 2 to be reduced to an intermediate product where W, W 2 C, and WC coexist, and a second heat treatment process in which the above-mentioned intermediate product or an intermediate product subjected to a pulverizing treatment and a mixing treatment is heated to 900-1,300°C in H 2 to be carbonized to the tungsten carbide powder. COPYRIGHT: (C)2006,JPO&NCIPI
    • 要解决的问题:为了提供平均粒度为100nm以下的钨粉末,由硬质材料如硬质合金,碳化钨烧结材料和具有较高硬度的复合陶瓷材料制成, 可以获得更高的强度及其制造方法。 解决方案:制备用于获得碳碳化钨粉末的纳米粒度钨粉末的方法,其总碳量为6.13±0.30质量%,游离碳量为0.30质量%以下,氧量为 0.7质量%以下,铁量为200ppm以下,平均粒径为100nm以下。 提供了第一热处理工艺,其中将微量氧化钨(WO 3 / SB>或WO 2.90 )粉末和碳粉末的混合物加热至1050-1200℃ 在N 2 中的C被还原成W,W< SB> C和WC共存的中间产物,以及第二热处理工艺,其中上述中间产物 或将经过粉碎处理和混合处理的中间产物在H SB 2中加热至900-1,300℃以碳化为碳化钨粉末。 版权所有(C)2006,JPO&NCIPI