EFFECT OF HIGH–ENERGY MILLING AND SINTERING TEMPERATURE ON THE STRUCTURE OF A HARDMETAL

Adriano Correa Batista; Hellen Cristine Prata de Oliveira; Macello Filgueira; Maria Aparecida Pinto; Geraldo Lucio Faria; Genivaldo Julio Perpetuo

Volume : VIII, Issue : VIII, August - 2018

EFFECT OF HIGH–ENERGY MILLING AND SINTERING TEMPERATURE ON THE STRUCTURE OF A HARDMETAL

Adriano Correa Batista, Hellen Cristine Prata De Oliveira, Macello Filgueira, Maria Aparecida Pinto, Geraldo Lucio Faria, Genivaldo Julio Perpetuo

Abstract :

This paper evaluated the effect of high–energy milling and sintering temperature on the structural characteristics of WC–10%Co. These samples were sintered at temperatures of 1350°C, 1400°C and 1450°C. The cooling rate of 100°C/h was used within the temperature range of 1000°C and 800°C to relieve residual stress from the sintering process. The samples were submitted to X–ray diffraction analysis with Rietveld refinement in order to characterize, at the atomic level, the effects of each processing stage on the material structure. The high–energy milling process may have accelerated the dissolution process of a large part of the WC particles during sintering, contributing to the formation of n phases. The characterization techniques were effective to evaluate the effects of high–energy milling, sintering temperature and residual stress on the structural characteristics of the composites investigated and the formation of amounts above 34% by weight of the Co6W6C and Co3W3C phases.