Zirconia Ceramic Raw Material Processing Technology

In most cases, zirconia ceramic raw material powder must undergo certain treatments before use, such as calcination, crushing, classification, purification, etc.

In most cases, zirconia ceramic raw material powder must undergo certain treatments before use, such as calcination, crushing, classification, purification, etc.

The purpose of processing the raw materials of zirconia ceramics is to adjust and improve the physical and chemical properties of zirconia ceramics, so that zirconia ceramics can meet the needs of subsequent processes and products performance.

So what are the specific processing procedures of the zirconia principle powder? The following Mingrui Ceramics will introduce to you.

1. Mixing of zirconia ceramic raw materials

In the preparation of special ceramics, two or more raw materials are often used, which requires mixing. Although zirconia ceramics are a kind of raw material, sometimes a small number of additives are added, and they also need to be mixed. The quality of the mixture directly affects the performance of the product. Especially when the density and ingredient ratio of the mixed materials are very different, or the properties of the materials are very special, the difficulty of mixing is increased.

2. Zirconia ceramic plasticization

The so-called plasticization refers to the process of adding plasticizer to the zirconia ceramic material to make the material plastic. Plasticizer is added only when pressing difficult-to-press materials. In powder metallurgy, plasticizers are often referred to as binders and mixed with lubricants as forming agents.

3. Granulation of Zirconia Ceramics

In order to obtain good sintering performance and improve the final performance of the zirconia ceramics, it is often necessary to select extremely fine raw material powder. However, the finer the powder, the worse the fluidity, which is not only unfavorable for automatic pressing but also the powder cannot evenly fill every corner of the mold. At the same time, the powder is fine, the bulk density is small, and the mold volume is large. For this reason, granulation is often required before forming.

4. Calcination of zirconia ceramic raw materials

The main purpose of calcining zirconia ceramic raw materials is:

a) Removal of volatile impurities, chemically combined and physically adsorbed moisture, gas, organic matter, etc. in the raw materials of zirconia ceramics, so as to increase the purity of the raw materials;

b) Densify the raw material particles of zirconia ceramics and grow their crystals, which can reduce the shrinkage of zirconia ceramics during subsequent sintering and increase the qualification rate of zirconia ceramics;

c) Complete the crystalline transformation of zirconia ceramic isomorphs to form a stable crystalline phase.