Three Different Sintering Stages of Alumina Ceramics

Sintering is a major process in the manufacture of alumina ceramics, and many different changes will take place before, during, and after sintering. Mingrui Ceramics will introduce to you the three different sintering stages of alumina ceramics.

Sintering is a major process in the manufacture of alumina ceramics, and many different changes will take place before, during, and after sintering. Mingrui Ceramics will introduce to you the three different sintering stages of alumina ceramics.

1. Before sintering

The temperature control at this stage is more important, because the temperature continues to rise, and the embryo body will contract with it, but the strength and density will not change much, if it is microscopic, the grain size will not change, but the embryo body at this stage is more prone to cracking, mainly because the binder and water are completely discharged. So we must pay attention to the speed at which the temperature rises.

2. In sintering

In the process of sintering, the temperature will change to a relatively small extent, the embryo body will contract gradually, and the density will change greatly. although there is still no obvious change in the grain microscopically, there is basically no bond between all the particles. and the whole pores will become smaller and smaller, the same because of the volume changes in the embryo body, it is still relatively easy to appear deformation and cracking.

3. After sintering

The temperature will rise greatly, the embryo body and density will change greatly, and the change of grain is more obvious microscopically, the pores will become smaller and many isolated pores will be formed, but some pores will remain on the grains directly.

The main driving force of alumina ceramic body sintering is the change of powder surface energy, that is, the decrease of powder surface energy, the decrease of surface area, and the densification of ceramics.

In the process of ceramic sintering densification, the material transfer can be carried out by solid-phase diffusion, including surface diffusion, grain boundary diffusion, lattice diffusion, and so on. Atmospheric pressure sintering is generally used in industry.

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