摘要
对掺杂微量元素钾的钨粉进行粒度分级后,发现钾的浓度是对粉末粒度敏感的因素,随粉末粒度减小,钾含量(PPM级)是增加的,几乎呈线性关系。由不同粒度钨粉分别制成的制品,钾的浓度依然遵循着粉末中的规律,但由于钾的微量差别引起制品许多物理性能的明显差异,也存在着较好的规律。俄歇分析表明钾可能存在于粉末颗粒表层的100A范围。在坯条中主要富集于晶界和气孔内,在棒丝中,晶界及解理面均存在有钾,经高温处理后,钾主要的钾泡形式沿丝轴排列。
It has been found that particle size is a sensitive factor affecting K content in W powder afterclassification of W powder doped with trace element K. K content (ppm) almost linely increaseswith the decrease of particle size. Such a rule is also suitable for K content in products made of Wpowders with different particle size. Obvious changes in many physical properties of W products dueto minor difference of K can still be ruled out. AES analysis indicates that K may exist in 100Aunder the surface of particles. K mainly concentrates on grain boundaries and pores in billets and ongrain boundaries and crack facets in rods and wires. It arranges along wire axis in the form of Kbubbles after heat treatment at high temperature.
关键词
钨
钾
俄歇电子法
粒度分析材料
tungsten
potassium
Auger electron spectrometly
granulometric analysis/particle size classification
particle of powder
