Zirconia ceramics and alumina ceramic materials with specific performance comparison:
|Molecular Formula||Density kg/m^3||Hardness HRC||Flexural Strength MPa||Fracture Toughness MPa 1/2||Water Absorption|
Alumina ceramics are white: 75, 85, 95, 96, 99 and high purity ceramics; substrates, substrates, ceramic shells, ceramic seats, ceramic rings, ceramic rods, ceramic eyes, tube seats, circuit shells, spark plugs, insulating sleeves, wear-resistant valves, wear-resistant mechanical volute cores, insulating ceramics for automotive circuits, etc.
High-purity zirconia ceramics are milky white, yellow or gray than pure zirconia ceramics: 95 zirconia and 99 zirconia ceramics; mainly produce cutting tools, all components in the engine, steel plant equipment, military, aerospace applications and other high-tech durables, wear-resistant parts, corrosion-resistant parts.
Zirconia ceramics have many advantages, such as high hardness, good wear resistance, high toughness, low friction coefficient and good corrosion resistance. They are widely used in mechanical seals, ball milling media, cutting tools, ceramic bearings, automotive engine parts, etc.
The wear resistance of zirconia ceramics is 15 times that of alumina ceramics. The friction coefficient of zirconia ceramics is only 1/2 of that of alumina ceramics, while the friction coefficient of alumina ceramics is very low.
The density of zirconia ceramics is higher than that of alumina ceramics. The density of alumina ceramics is 3.5. The density of zirconia ceramics is 6. The texture of zirconia ceramics is more delicate. After grinding, the surface finish of zirconia ceramics is higher than_9. It is mirror-like, very smooth and the friction coefficient is smaller.
In addition, the toughness of zirconia ceramics is excellent, which is the highest in ceramics. Its toughness is 3-4 times that of alumina ceramics. It overcomes the inherent brittleness of ceramics, has higher wear resistance and greatly prolongs the service life of products. This is also the important reason why Sangong always insists on making ceramic ball valve parts with zirconia ceramics.