Surely we all know that in our alumina ceramic sintering time we have to go through three stages, in fact, the whole is before sintering, sintering and sintering. In fact, we may not know a lot of things when he sintering are undergoing change. Here Jiangsu Province Ceramics Research Institute will introduce these three periods to expand.
Before sintering is important to control this process, because he will shrink as the temperature rises, but he's basically no change in the density and strength, he is also no change in grain size. But he could easily crack, which is due to water and binder he had a process of elimination, we want to speed warming extra attention.
Sintering, his temperature will be some changes, and the volume will have a contraction, of course, the density change is also cry, although little change in grain size, grain can not so thick, and the gap will be largely becomes smaller. This period and easily occur deformation and cracking.
After sintering, the temperature will rise, density and intensity is constant, the gap becomes smaller, there will be an isolated pores appear, there are some holes will remain in the grain inside. If in the future you see the grain sintering bigger, then this is for our results will have some impact, so we can add some additives to prevent larger grains.(picture/text http://www.magnetwireschina.com/)