Phase-field simulation of liquid phase migration in the WC-Co system during liquid phase sintering
K. Cheng, L. Zhang, C. Schwarze, I. Steinbach, Y. Du,
Volume: 107. Pages: 309--314
DOI: 10.3139/146.111353
Published: #apr# 2016
Abstract
Liquid phase sintering is a process for forming high performance,
multiple-phase components from powders. The process includes very
complex interactions between various mass transportation phenomena,
among which the liquid phase migration represents an important one
in the aspect of forming a gradient structure in cemented carbide.
In the present work, phase-field simulation of the liquid phase migration
phenomenon during liquid phase sintering is performed in the WC -
Co based cemented carbide. The simulation results are analyzed and
compared with the experimentally determined key factors of microstructural
evolution, such as contiguity and liquid phase migration rate. The
diffusion-controlled solution-precipitation mechanism of the liquid
phase migration process in the cemented carbide system is confirmed
from the current simulation result, which provides deeper understanding
of the microstructural evolution during the liquid phase migration
process. These simulations can offer guidance in preventing the liquid
phase migration process during liquid phase sintering of cellular
cemented carbide.