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The as-sintered sinter skin and the polished section of WC-11Co-0.4Cr 3 C 2-0.3VC-0.2RE(RE=mischmetal with La/Ce ratio of 0.65) alloy were analyzed.It was shown that the microstructures on the skin and in the inner part of the alloy were all characterized with a WC+β+M structure,where β was a cobalt-based binder phase and M represented a RE-containing phase.There existed an inward diffusion of S atoms,which caught and fixed the Ce atoms in the alloy and an outward diffusion of La atoms during the sintering process.Consequently,the M phase was characterized with the decreased La/Ce ratio(0.59) in the inner part and the increased La/Ce ratio(1.01) on the skin.The M phase on the skin was characterized with a γ-Ce 2 S 3 type structure.To suppress the long range migration of rare earth to the skin,S in the sintering atmosphere had to be eliminated.
The as-sintered sinter skin and the polished section of WC-11Co-0.4Cr 3 C 2-0.3VC-0.2RE (RE = mischmetal with La / Ce ratio of 0.65) were both analyzed. It was shown that the microstructures on the skin and in the inner part of the alloy were all characterized with a WC + β + M structure, where β was a cobalt-based binder phase and M represented a RE-containing phase. and fixed the Ce atoms in the alloy and an outward diffusion of La atoms during the sintering process. Classical, the M phase was characterized with the decreased La / Ce ratio (0.59) in the inner part and the increased La / Ce ratio (1.01 on the skin. The M phase on the skin was characterized with a γ-Ce 2 S 3 type structure. suppress the long range migration of rare earth to the skin, S in the burning atmosphere had to be eliminated.