超细钨粉碳化时碳黑粒径对WC粉化合碳的影响  

Influences of Carbon Black Particle Size on the Compounded Carbon Content in WC Powders

作　　者：晏洪波[1] 张丽英 徐晓娟[1] 李汶霞[1] 吴成义[1] 

机构地区：[1]北京科技大学材料学院,北京100083

出　　处：《北京科技大学学报》2000年第6期536-538,共3页Journal of University of Science and Technology Beijing

基　　金：国家"863"资助项目!(NO.715-009-0012)

摘　　要：采用超细颗粒（０．３５μｍ）钨粉与不同粒径（０．１，０．３，０．８，４．５μｍ）的碳黑粉，按Ｗ＋Ｃ ＝ＷＣ的反应式配碳，在氢气保护下，于８３０～１３００℃保温４０ｍｉｎ，研究碳黑粒径、碳化温度对ＷＣ粉的化合碳含量及物相组成的影响．ＸＲＤ分析物相组成，用化学分析测定碳含量（质量分数）结果表明：当使用０．１μｍ的超细碳黑，温度大于９３０℃时，ＷＣ粉的含碳量可达理论含量．但是在此温度下，随着使用的碳黑粒径增大，ＷＣ粉中的化合碳含量急速下降，例如在９５０℃下，使用０．３μｍ的碳黑只能使ＷＣ粉化合碳达到５．２％，使用０．８ μｍ碳黑时，ＷＣ的化合碳为３．１８％．With the ultrafine W powder (0.35 μm) and carbon black powders of various shes(0.1, 0.3, 0.8, 4.5 μm), the influences of carbon black pride size and carburization temperatures(830-1300℃ for 40 min) on the compounded carbon content and phase compositions in WC powders were investigated at the atmosphere of H2. The adding amount of carbon was determined under the reaction equation of W+C=WC. The phase compositions of the reacted products were analyzed by XRD. The experimental results demonstrated that when ultrafine carbon of 0. 1 μm was used, the compounded carbon content in the WC powders was up to 5.8%(mass fraction), corresponding to 95% of the theoretical content, at very low temperature of 850℃; when the temperature was higher than 930℃, the carbon content of WC powders approached the theoretical one. It is concluded that carburization can be completed at very low temperature when the ultrafine carbon black powders are used, in which the ultrafine W particles are carbonized before the they begin to grow and form W aggregation.

关 键 词：碳化反应 碳黑粒径 WC粉 化合碳 超细钨粉 

分 类 号：TF123.72[冶金工程—粉末冶金] TF123.31[冶金工程—冶金物理化学]