Ceramic rods usually use wear-resistant zirconia ceramics or alumina ceramics as raw materials, which have excellent performance, but some factors will affect the use of ceramic rods. Pintejin Ceramics Factory will tell you what factors will affect ceramic rods?
Influence of raw material powder:
The main raw material of ceramic rod is high-purity zirconia powder, and its performance and content have a great influence on zirconia ceramics. In the preparation process of ceramic powder, it is inevitable to introduce impurities. The organic impurities are burned off during the firing process, and irregular pores are formed in the process of early densification. Inorganic impurities may react with the ceramic powder at high temperature. Or remain in the matrix to form microcracks. These microstructure defects caused by impurities have a significant impact on the densification of zirconia ceramics. Therefore, the use of high-purity zirconia powder is an important prerequisite for preparing zirconia ceramics with excellent performance.
Wear-resistant zirconia rod The influence of raw material powder particle size:
The particle size of the raw material powder has a great influence on the performance of the product. Only when the raw material is fine enough, the final fired product can form a microstructure, which makes it have good wear resistance. The finer the zirconia powder particles, the greater the activity, which can promote sintering, and the strength of the resulting porcelain is also higher. The risk of cracking, fine grains can also hinder the development of micro-cracks, and it is not easy to fracture in transgranular, which is conducive to improving fracture toughness and wear resistance.
Influence of molding method:
Practical production and a large number of studies have shown that the zirconia ceramics with low porosity and high density have excellent nodal properties. Informed density means that the grains in the ceramic body are closely arranged, and it is not easy to form destructive breakthrough points when subjected to external loads or corrosive substances. In order to obtain a ceramic embryo with calcium density, the molding method is the key. The molding of zirconia ceramics generally adopts methods such as dry pressing, isostatic pressing, and hot die casting. Different methods have different characteristics and have different effects on the sinterability and microstructure of the curing rate ceramics. Generally, grouting and hot die casting are mainly used for products with complex shapes, and dry pressing can be used for products with simple shapes. Generally speaking, the compactness of dry-pressed products is better than that of hot-die-cast products.
Effects of sintering:
For the sintering of ceramics, simply speaking, it is the densification process of the ceramic green body at high temperature. With the rise of temperature and the prolongation of time, the powder particles are bonded together, the strength of the sintered body increases, and the aggregate of the powder particles becomes a strong polycrystalline sintered body with a certain microstructure. The physical and mechanical properties of an article or material. The densification rate and final structure of the sample often reflect the heat treatment process it has undergone.
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