Ceramic Material

Ceramic Material

♦ Ceramic generally refers to the solid material obtained after high temperature heat treatment, namely sintering , of non-metallic inorganic materials with ionic bonding or covalent bond. Its shape can be crystalline , Semi-crystalline or amorphous.

♦ Ceramic green body is composed of many single solid particles. After forming, there are a lot of pores in the green body. Generally, the porosity is between 35% and 55%, and the specific value depends on the characteristics of each material and the forming technology used.

♦ Ceramic sintering can be divided into solid state sintering, liquid phase sintering and reactive sintering, and each corresponds to a different reaction mechanism. In the process, the appropriate sintering method is selected according to the difference of materials.

♦ Sintering can be simply defined as: When the powder or green body is lower than the melting point of its material, the atoms are rearranged and combined by heat treatment, and the powder particles gradually grow into grains and join each other. While the grains grow, the holes in the green body are eliminated, resulting in the densification process of decreasing porosity and increasing density leads to the formation of products with high mechanical properties.

♦ Taiwan Applied Crystal can assist customers in developing various types of inorganic ceramic materials to meet different market needs

The ceramic material is not fully densified through microstructure observation, as shown in the figure, there are still pores, and the relative density of the material is less than 85%. If the density of the material is lower, the relative mechanical properties (strength/hardness, etc.) will be worse, which will affect the characteristics of the end product or production yield.

Compared with the same ceramic material, the sintering method or the optimization of sintering parameters can be used to make the material achieve full densification after sintering. The morphology of the individual crystal grains is complete, and there are no residual pores between the grain boundaries, and the relative density of the material can reach 100%. In addition, according to the needs of the end product, the sintering process parameters can be adjusted to a sintered body with appropriate specifications.