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Ozer O.,Missiaen J.M.,Pascal C.,Lay S.,Chaix J.M.,Mitteau R. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Processing of W-Cu graded materials from attritor-milled W-CuO mixtures is described. The powder reduction steps are investigated by TG and XRD analyses and by microstructural observations (SEM, TEM). Sintering of reduced powder with different compositions is analysed by dilatometry. Sintering behaviour of the graded component processed by co-compaction of a 10/20/30wt%Cu multi-layer material is briefly discussed. Liquid Cu migration is observed and smooths the composition gradient. Perspectives to control this migration are discussed.
Microstructure Features of Large Grains in WC-Co Alloys
Delanoe A.,Lay S.,Missiaen J.M. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
This paper presents a study of large grains by transmission electron microscopy in two WC-Co alloys, one W rich and one C rich. In the W rich alloy, some large grains are found in contact with the phase. The C content influences the morphology of large grains: they are flatter in the C rich alloy with smoother interfaces. Whatever the C content, they contain few dislocations compared to matrix grains except often in a small area. Small WC grains are often found inside the large grains. They have likely been engulfed during the growth of the large grains owing to the low boundary energy.
Allibert, C . H .,Chabretou, V .,Lavergne, O .,Missiaen, J . M . 대한금속재료학회(대한금속학회) 1999 METALS AND MATERIALS International Vol.5 No.2
The liquid-phase sintering (LPS) of cemented carbides prepared from submicronic powders induces a microstructural evolution generally ascribed to normal and abnormal grain growth. Such phenomena can be prevented by small additions of inhibitors (Cr, V) Presently, the mechanisms controlling either the grain growth or its inhibition are not strictly identified. In the present work, the effects of major parameters on grain growth (initial WC grain size, liquid composition, liquid fraction) are studied by image analysis of specimens sintered at 1450℃ up to 8h. The evolution of the mean intercept and intercept distribution of WC grains is analysed in teens of the possible mechanisms involved.