What are the categories of industrial ceramics?

What are the categories of industrial ceramics?
1. Common ceramics
Ordinary ceramics refer to clay ceramics, which are fired from clay, feldspar and quartz in proportion. Its performance depends on the purity, particle size and proportion of the three raw materials. Generally, it is hard, corrosion-resistant, non-oxidizing, non-conductive, able to withstand certain high temperatures and has good processing formability.
2. Alumina ceramics
The ceramic is mainly composed of AL2O3 (the mass fraction of AL2O3 is more than 45%). According to the different main crystal phases in the ceramic body, it can be divided into corundum porcelain, corundum-mullite porcelain and mullite porcelain, etc; It can also be divided into 75 porcelain, 95 porcelain and 99 porcelain according to the mass fraction of AL2O3.
3. Silicon carbide ceramics
Silicon carbide ceramics are characterized by high temperature strength, high thermal conductivity, high wear resistance, corrosion resistance and creep resistance. They are often used as high-temperature sintered materials in the fields of national defense, aerospace and other scientific and technological fields, that is, for manufacturing nozzle of rocket tail nozzle, nozzle for pouring metal, thermocouple sleeve, furnace tube and other high-temperature parts.
4. Lithium oxide ceramics
The main crystalline phases of lithium oxide ceramic products are nepheline (Li2O · Al2O3 · 2SiO2) and spodumene (Li2O · Al2O3 · 4SiO2), which are characterized by low thermal expansion coefficient (-0.03 in the range of 100~1000 ℃ × 10/℃~ 4.08 × 10/℃), good thermal shock resistance. Li2O is a kind of oxide outside the network, which can strengthen the glass network and effectively improve the chemical stability of the glass.