Wear resistant zirconia ceramic plunger

Zirconia ceramics is a new type of high-tech ceramics. In addition to high strength, hardness, high temperature resistance, acid and alkali corrosion resistance and high chemical stability, it also has the characteristics of scratch resistance, no signal shielding, and excellent heat dissipation performance. , At the same time, it has strong machinability and good appearance, and is suitable for mass production. Pure ZrO2 is white, yellow or gray when it contains impurities, and generally contains HfO2, which is not easy to separate. The world's proven zirconium resources are about 19 million tons, and zirconia is usually obtained by purifying zirconium ore. Most of the ceramic materials for consumer electronics are zirconia ceramics due to their phase transformation toughening properties. At present, many ceramic plungers are made of zirconia.

Zirconia ceramics have high hardness and good wear resistance. Zirconia ceramics have high strength (up to 1500MPa). Although the toughness is far behind some metals, compared with other ceramic materials, zirconia ceramics are the best in the "ceramic circle" (1-35MPa). .m1/2). The thermal conductivity of zirconia is the lowest among common ceramic materials (1.6-2.03W/(m.k)), and the thermal expansion coefficient is close to that of metals. Therefore, zirconia ceramics are suitable for structural ceramic materials, such as zirconia ceramic mobile phone appearance structural parts. The dielectric constant of zirconia is 3 times that of sapphire, the signal is more sensitive, and it is more suitable for fingerprint identification patches. From the perspective of shielding efficiency, zirconia ceramics, as a non-metallic material, have no shielding effect on electromagnetic signals, and will not affect the internal antenna layout at all, and can be easily integrated into one body to adapt to the 5G era.