Alumina ceramic ring
Aluminum oxide ceramics, silicon nitride ceramics, zirconia ceramics
The alumina ceramic ring itself has the characteristics of high hardness, wear resistance and corrosion resistance. It is formed by dry pressing, grouting, hot pressing and static pressing, which helps to eliminate microscopic pores, and is widely used in mechanical seals. Ball milling media, cutting tools, ceramic bearings, automotive engine parts, paper machine dehydration equipment, etc. The preparation process of alumina ceramics is essentially a densification process that safely excludes microscopic pores during the sintering process. The size, quantity, and type of pores in the material will have a significant impact on its transparency. In addition to the porosity, the diameter of the pores also has a great influence on the light transmittance of alumina ceramics. Alumina ceramics have excellent mechanical strength, high temperature resistance, wear resistance, corrosion resistance, good insulation performance and durability. Alumina ceramic ring has low dielectric constant, small dielectric loss, high dielectric strength, high volume resistivity, good bending strength, high stability, high compressive strength, and good thermal shock denaturation. It is widely used in thermostats, insulating parts of various small household appliances, various thermal equipment, electric heating equipment, iron structures, shipbuilding, etc.
Advantages of alumina ceramic rings :
High hardness, excellent wear resistance, corrosion resistance and high temperature resistance, good self-lubrication, not easy to scale. 坣壱屲 Alumina ceramic fittings have high hardness, high strength, low expansion coefficient, insulation, wear resistance, and corrosion resistance. Electric heating instrument, instrument, chemical industry, communication, communication and other industries.
Disadvantages of alumina ceramic rings:
Generally, the elastic modulus is quite large, the hardness is high, the brittleness is large, and the crack sensitivity is strong. Therefore, the difficulty of machining is mainly reflected in the processing hardness and brittleness.
Usually, the microstructure of alumina ceramics is equiaxed crystal grains. It is a polycrystalline structure composed of ionic bonds or covalent bonds, so the fracture toughness is low under the action of external loads.
Stress will cause fine cracks on the ceramic surface, and the cracks will expand rapidly and cause brittle fractures. Therefore, during the machining and cutting of alumina ceramic rings, cracking often occurs, that is, cracks appear on the ceramic surface. Small gap.