Author:Site Editor Publish Time: 27-07-2017 Origin:Site
Alumina ceramic tablets are a, B, y has three crystal forms, of which a, y two crystal as the most raw materials, alumina ceramic at 1600 ℃ can be converted to alumina, several crystal form, C-A12 03 is the most stable, the best electromechanical performance, and is suitable for alumina ceramic raw materials. Alumina ceramics are characterized by high mechanical strength, high volume resistivity, good electrical insulation properties, high strength, wear resistance, and oxidation resistance. They are widely used as structural parts and functional devices such as mechanical, Used in the field of wear-resistant corrosion-resistant components; crucible, protection tube, metallurgy.
The zirconia ceramic has the characteristics of high melting point, hardness, strength and toughness. The biggest characteristic is the high hardness, low specific heat capacity and thermal conductivity, which can form oxygen vacancy defect solid solution and so on. It is widely used as structural ceramics and functional ceramics, , Mechanical parts, advanced refractory materials.
Zirconia ceramic shaft industry used in the refractory materials; substrate, insulators, radar radomes, microwave electrolytes and other electronic industry porcelain pieces, alumina zirconium ceramics is early research, widely used and more mature one of the new ceramic.
Zirconia ceramics have three crystal forms. At room temperature is monoclinic type, heated to about 1170 ℃ into a tetragonal type, and accompanied by about 7% of the volume shrinkage; heated to 2370 ℃ or so into a cubic crystal, to about 2700 ℃ melting, the above changes are reversible change. Zirconium has a high melting point, hardness, strength and toughness. Specific heat capacity and low thermal conductivity, can form oxygen vacancy defects solid solution and other characteristics, is widely used as structural ceramics and functional ceramics, such as tools, mechanical parts, advanced refractory materials, high temperature anion conductor, oxygen sensors. However, one of the major drawbacks of zirconia ceramics is its high strength and toughness at high temperature, so that it is limited in commercial temperature conditions.