Electro Discharge Compaction of WC-Co Composite Material Containing Particles of Diamond


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In the present paper, the formation of high hardness and large strength structure of WCCo composite material containing particles of diamond were investigated and optimal operating parameters were defined. Tungsten carbide - cobalt - diamond composite was produced by the method of high voltage electrical discharge together with applying mechanical pressure to powder compact. It was found that the density and hardness of composite material reach its maximum values at certain magnitudes of applied pressure and high voltage electrical discharge parameters. We found that there is [a maximum level -Comment: Don’t you mean a maximum level?] for the discharge voltage and applied pressure beyond which the powder WC-Co-diamond composite material disintegrates like an exploding wire. Near this level, the cobalt particles are in a fused condition and are redistributed in the compact volume due to magnetic pressure of discharge current pulse. [The distribution of magnetic pressure is defined by the distribution of a current density in the powder compact. The magnetic pressure is more homogeneous in powder compact volume when the skin effect is strong.-Comment: Are these two statements of fact or conclusions made based on experimental observations? - Answer: The first statement is fact and the second statement is conclusion made based on experimental observations.]



Materials Science Forum (Volumes 534-536)

Edited by:

Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim




E. Grigoriev and A. Rosliakov, "Electro Discharge Compaction of WC-Co Composite Material Containing Particles of Diamond", Materials Science Forum, Vols. 534-536, pp. 1181-1184, 2007

Online since:

January 2007





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