Sintering description of polycrystalline ceramic materials

The properties of polycrystalline ceramic materials are not only related to their chemical composition, but also closely related to their microstructure. After the formulation, mixing, molding, and other processes are completed, sintering is a key process for obtaining the expected microstructure and endowing the material with various properties.

The summary description of sintering of special ceramics is as follows: it is a general term for the densification process and phenomena of zirconia ceramic billets at high temperatures. As the temperature increases and time prolongs, solid particles bond with each other, grains grow, voids (pores) and grain boundaries gradually decrease. Through material transfer, their total volume shrinks, density increases, and finally becomes a hard polycrystalline sintered body with a certain microstructure. This phenomenon is called sintering.

Sintering is a process that reduces pores in the formed body, enhances the bonding between particles, and improves mechanical strength. During the sintering process, as the temperature increases and the heat treatment time prolongs, the porosity decreases continuously, and the bonding force between particles increases. When a certain temperature and heat treatment time are reached, the bonding force between particles shows a maximum value. After exceeding the maximum value, there is a slight tendency towards porosity, while the grain size increases and the mechanical strength decreases. In mechanics, sintering refers to the process of reducing the total energy of the system.

Recommended reading:

Production of zirconia ceramic raw materials

Auxiliary materials for zirconia ceramic elements

The Use of Elements in Zirconia Ceramics

What can be added to 95 alumina ceramic raw materials to increase thermal conductivity?

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