Abstract
The present authors recently reported that the strength of conventional WC-Co cemented carbide is directly controlled by structural defects, in particular by residual pores up to about 150μφ, suggesting that the strength should remarkably increase even by eliminating the coarse pores only. In this investigation, therefore, the strength of WC-10%Co alloy free from coarse residual pores (more than about 30μφ) which are usually contained in coventional alloys was studied in detail in relation to sintering conditions and carbon contents in the alloy.
As a result, it was confirmed that the strength of the alloy easily increased to such a high value as 350∼370 kg/mm2 (according to the JIS) as expected. It was also confirmed that the strength of the present specimen was not sensitive to sintering conditions and that in the scope of this experiment the strength of low carbon two-phase alloy was surely superior to that of high carbon alloy.
