YI Xinyu, ZHANG Huali, DU Jishi, XU Wanli, HUANG Xiaojun, LEI Yangjun
(Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 629100, Sichuan, China)

Abstract: The powder adhering that occurred during debinding process of the low-pressure injection molded 95 alumina was a threat to its performance. In this paper, a method of using debinding powder mixed with particles of different sizes for solving powder adhering was presented, and a comparison was done between this and the traditional method. Debinding with the mixed powder entirely prevented the powder adhering on the surface and ensured the capability of 95 alumina ceramic as well, improving its bending strength and dielectric breakdown strength. The debinding method with the mixed powder has the advantages of simple operation and no impurity. Additionally, based on the phase transformation and the change of the surface free energy during the debinding process, this paper discussed the mechanism of the powder adhering and the causation of the powder adhering prevention.

Key words: 95 alumina ceramic; low-pressure injection molding; debinding; powder adhering