Fabrication of Nanosized Tungsten Carbide Ceramics by Reactive Spark Plasma Sintering
Fabrication of Nanosized Tungsten Carbide Ceramics by Reactive Spark Plasma Sintering
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DOI：
10.1111/j.1551-2916.2011.04813.x
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发表时间：
2011-10
影响因子：
3.9
通讯作者：
Shikuan Sun;Y. Kan;Guo‐Jun Zhang
中科院分区：
文献类型：
--
作者：
Shikuan Sun;Y. Kan;Guo‐Jun Zhang
以氮化钨和炭黑为原料，采用反应放电等离子烧结法制备了无粘结剂碳化钨陶瓷。研究了烧结过程中的相和组织演变。发现氮化钨首先分解成粒径约为25 nm的纳米钨，然后与炭黑反应生成碳化物。由于原位形成的碳化物的高活性，样品可以在低至1350℃的温度下致密化。晶粒尺寸为270 nm，维氏硬度为25.4 GPa。
Binderless tungsten carbide ceramics were produced by reactive spark plasma sintering, using tungsten nitride and carbon black as starting materials. The phase and microstructure evolution during the sintering process was investigated. It was found that the tungsten nitride decomposed into nano tungsten with a particle size of about 25 nm firstly, and then reacted with carbon black to form carbides. Due to the high activity of the in situ formed carbides, samples could be densified at a temperature as low as 1350°C. The bulk carbides possessed an average grain size of 270 nm and Vickers’ hardness of 25.4 GPa.