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7 important properties of alumina
Alumina has several very important properties that make it one of today's popular and versatile ceramic injection molding materials:
Temperature stability
Alumina is extremely temperature stable, able to withstand atmospheric temperatures of 2900 ° F or 1650 ° C, and vacuum temperatures up to 3000 ° F or 2000 ° C. Parts made of alumina maintain 50% of their room temperature tensile strength at 1000 ° C.
Abrasion resistance
Wear is the act of wearing a material through friction, changing its structure and reducing its suitability under desired conditions. Alumina has a very high hardness, making it very resistant to wear and other types of mechanical wear. This means that parts and assemblies made of alumina will retain their desired performance and shape for longer.
Chemical resistance
Alumina is chemically inert and non-reactive, which means it is highly resistant to different types of chemicals, including alkalis and acids. Alumina does not cause surface and structural damage due to exposure to salt and solvent solutions at high temperatures, which further extends the durability and life of different components.
Density
Material density is its mass divided by its volume, expressed in g/cm3 or grams per cubic centimeter, which means that material density is inversely proportional to volume. Alumina is composed of fine particles with no voids in the material, and the fewer voids, the higher the density and volume. The density of alumina varies at different temperatures, with a standard density of 3.965g/cm3 at 25 ° C.
Mechanical properties
The mechanical properties of materials involve their strength, which refers to the strain and stress a material can withstand before breaking. Aluminum oxide has a very high strength that can only be further improved by higher purity.
Dielectric and Thermal Properties
Alumina is ideal for insulation purposes because it prevents electrical current from passing through it. In addition, it is very resistant to thermal shock, which is one of the properties of this technical ceramic, which is further improved as the purity increases.
Hardness
Hardness refers to the ability of a material to withstand mechanical wear and tear. In this regard, alumina is harder than tungsten carbide and steel tools. It has an HRA80-90 hardness that only diamond can surpass.
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