Alumina Ceramic Hardness

Aluminium oxide is responsible for the resistance.

Alumina ceramic hardness.

In its most commonly occurring crystalline form called corundum or α aluminium oxide its hardness makes it suitable for use as an abrasive and as a component in cutting tools. Al 300 97 6 alumina this is a top quality alumina ceramic of 97 6 al 2 o 3 content widely used for high integrity components where its exceptional electrical and thermal properties are essential to operational stability and reliability. High heat resistance and high thermal conductivity. High electrical insulation high corrosion resistance and biocompatibility.

Alumina is the most well known fine ceramic material for chemical and physical stability. Obtained results of hardness and fracture toughness of high purity alumina ceramics are also in conformity with results in the literature data 4. It features high hardness and wear resistance low erosion levels high temperature resistance corrosion resistance and bioinertness. Acknowledgments the presented research results were achieved within the scientific project structure and properties of engineering ceramics and ceramic coatings agreement no 120 1201833 1789.

The hardness of alumina ceramics is nearly three times that of stainless steel. Commercially available grades range from 90 up to 99 95 with the higher purity generating somewhat higher hardness. Silicon carbide is more than four times harder than stainless steel. Alumina aluminum oxide al2o3 is an industrial ceramic that has high hardness is long wearing and can only be formed by diamond grinding.

Alumina is an excellent high temperature ceramic material due to its high temperature stability. Features of this material include. Alumina ceramics are made from a white granular material or a very fine silky dense powder refined from bauxite. Alumina ceramics are generally white but may also be pink 88 alumina or brown 96 alumina.

Al 2 o 3 is an electrical insulator but has a relatively high thermal conductivity 30 wm 1 k 1 for a ceramic material. Alumina ceramic is the most mature of the engineering ceramics offering excellent electrical insulation properties together with high hardness and good wear resistance but relatively low strength and fracture toughness. Often hardness of ceramic material as with other materials is directly equated to wear resistance. The hardness of ceramic materials is a property which is of high significance as it relates to the ability of the material to withstand penetration of the surface through a combination of brittle fracture and plastic flow.

It is possible to machine alumina using diamond grinding techniques. Additionally it can be highly polished making it useful for precision sealing applications like pumps and pistons. Alumina is produced by firing a tightly packed powder form of al 2 o 3 which includes some binder material.