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http://dx.doi.org/10.4150/KPMI.2020.27.4.293

Synthesis of W2C by Spark Plasma Sintering of W-WC Powder Mixture and Its Etching Property  

Oh, Gyu-Sang (Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technology)
Lee, Sung-Min (Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technology)
Ryu, Sung-Soo (Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of Powder Materials / v.27, no.4, 2020 , pp. 293-299 More about this Journal
Abstract
W2C is synthesized through a reaction-sintering process from an ultrafine-W and WC powder mixture using spark plasma sintering (SPS). The effect of various parameters, such as W:WC molar ratio, sintering temperature, and sintering time, on the synthesis behavior of W2C is investigated through X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) analysis of the microstructure, and final sintered density. Further, the etching properties of a W2C specimen are analyzed. A W2C sintered specimen with a particle size of 2.0 ㎛ and a relative density over 98% could be obtained from a W-WC powder mixture with 55 mol%, after SPS at 1700℃ for 20 min under a pressure of 50 MPa. The sample etching rate is similar to that of SiC. Based on X-ray photoelectron spectroscopy (XPS) analysis, it is confirmed that fluorocarbon-based layers such as C-F and C-F2 with lower etch rates are also formed.
Keywords
Tungsten carbide $W_2C$; Spark plasma sintering; Reaction-sintering; Etching property;
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