Wear-resistant ceramic wear theory and the basic factors that affect use

1, ceramic wear theory

Wear is a very old but very important topic.Previous research of wear, mostly focused on the metal alloy, coating and polymer.At present, the people of AL2O3 and ZrO2, SIC, SI3N4 ceramics and composites a lot of study on the mechanism of friction, abrasion and, due to the inherent in ceramics have a lot of different structure and performance characteristics and metal, made from metal friction and wear principle is applied to ceramics, encountered great difficulties, and is suitable for ceramic friction and wear of the theory is not perfect.

Wear generally can be divided into cutting wear, fatigue wear, adhesive wear, abrasive wear, impact wear, such as several categories, due to the working principle of each type of wear is not the same, so the wear mechanism of the difference is bigger also, but in practical application or trials, they are not isolated, but interrelated and influence each other, sometimes is a kind of mechanism of obvious, sometimes two or several kinds of mechanism combination.

From different point, people can be traced to the research of wear resistant ceramic friction and wear of external factors on the impact wear properties and the relationship between the internal factors and wear characteristics of two aspects.External factors mainly include friction way, environment, load, sliding velocity, temperature and time, etc.Internal factors mainly including hardness, strength, toughness, elastic modulus, particle size, porosity, grain boundary is equal.

2, key factors influencing wear-resisting ceramics using effect

(1) the influence factors of wear resistant ceramic

To obtain high wear resistance of Al2O3 ceramic material, not only should consider to make it with high density, flexural and compressive strength, and to improve its hardness and fracture toughness, and these properties and the microstructure of Al2O3 ceramics (closed porosity, grain size and distribution of glass phase, etc.) and its wear mechanism are closely related.

Alumina ceramic preparation of various process conditions are sintering and the microstructure of it has great influence.They include: the preparation process of powder, particle size and particle size distribution, forming method, green density, sintering temperature, heating rate, holding time, sintering atmosphere, whether pressure and so on.

Such Chemshun as wear-resisting ceramics is adopted won the national science and technology progress third prize of scientific research, the core is to control the impact abrasion resistant ceramics performance three main factors: the best alumina materials and the preparation method of grinding grading, high density, reasonable sintering temperature and holding time, the production of wear-resistant ceramic has excellent comprehensive performance, microstructure shows that also is very beneficial to improve the wear resistance.