A novel technique for production of nano-crystalline mono tungsten carbide single phase via mechanical alloying
A novel technique for production of nano-crystalline mono tungsten carbide single phase via mechanical alloying
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机械合金化制备单相纳米晶碳化钨新技术
DOI：
10.1016/j.jallcom.2011.03.137
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
R. Yazdani
中科院分区：
文献类型：
--
作者：
M. Razavi;M. Rahimipour;R. Yazdani
由于在大多数合成过程中同时合成了WC和W2C相，并且W2C的力学性能低于WC，本工作研究了用机械合金化方法制备纳米晶WC单相作为一种实用耐火陶瓷的可能性。用行星球磨机对含W、C和WC的原料进行球磨。抽样的时间不同。如预期的那样，X射线衍射研究表明，球磨75h后，生成了含有W2C的WC。通过在球磨开始时向原料中加入WC，导致球磨50h后只合成了WC，没有任何其他相，在球磨过程中较高的时间保持稳定。在X射线衍射峰展宽过程中，合成的WC晶体尺寸估计为纳米量级。无添加剂体系合成的WC晶粒度高于含WC体系，平均应变低于含WC体系。
Due to simultaneous synthesis of WC and W2C phases in most of the synthesis processes and lower mechanical properties of W2C than WC, in this work the possibility of production of nano-crystalline WC single phase as a useful refractory ceramic by means of mechanical alloying has been investigated. The raw materials containing W and C with WC were milled in a planetary ball mill. The sampling has been done in different times. As it was expected, XRD studies showed that after 75 h of milling the WC with W2C were produced. By adding WC to the raw materials in the beginning of the process it led to the fact that after 50 h of milling WC was synthesized only without any other phases which remained stable at the higher times while milling. During broadening of XRD peaks, the size of synthesized crystalline WC was estimated in the order of nano-meter. Crystalline size and mean strain of synthesized WC in the system without additive were higher and lower than the system containing WC, respectively.