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What are the factors that effect the performance and properties of ceramic liners

2016/07/25

Wear resistance ceramics are mainly effected by following factors in terms of property and performance.

 

Raw materials

Raw alumina powder is the main composite of wear resistant ceramic. In production, the raw alumina is unavoidably polluted by some impurity elements from outside. Some of the elements will be combusted in the furnace and forming holes or bubbles remained in the ceramic. Some inorganic elements may react with alumina or remains in the ceramic and causing cracks. Such impurity will be seriously effecting the compactness of ceramic. So production of high quality raw alumina powder is one of the essential preconditions for producing high quality ceramics.

 

Raw material particle size

The particle size of alumina powder also plays a very crucial role in producing high quality ceramics. The higher wear resistance of ceramics always comes with alumina powder in smaller particle size. Smaller alumina particles are more active in high temperature and help sintering the ceramics in higher toughness, and also help to stop the cracks happening inside the ceramics. So, raw material particle size partly decides the wear resistance and toughness of ceramics.

 

Molding methods

Vast applications have proved that, ceramic with lower porosity and higher compactness has better quality and performance. Higher compactness means the alumina particles are tightly and evenly distributed, which are more resistant to outside impact and corrosion. Molding method is very crucial factor to make the higher compactness of ceramics. Alumina ceramics are always formed by methods of air dry pressing, isostatic pressing or hot injection. Hot injection technology is always implemented to make some ceramic wear parts in complex structures, and air dry pressing or isostatic pressing used for parts in simple or regular shapes. Generally, dry or isostatic pressing can form ceramic in better compactness.

 

Sintering

Sintering is to heat the alumina powder to ceramic in furnace of high temperature. The alumina particles are stick together and gradually forming the ceramic with higher toughness. Proper sintering will result in ceramic in better physical and chemical properties and actual performance.