What is Industrial Ceramics

Industrial ceramics refer to ceramics used in industrial production and industrial products. It is a type of fine ceramics that can perform mechanical, thermal, chemical, and other functions in applications. Due to a series of advantages such as high temperature resistance, corrosion resistance, wear resistance, and erosion resistance, industrial ceramics can replace metal materials and organic polymer materials for harsh working environments. It has become an essential and important material in traditional industrial transformation, emerging industries, and high-tech industries, and has a very broad application prospect in fields such as energy, aerospace, machinery, automotive, electronics, and chemical engineering. Utilize corrosion-resistant and chemically stable ceramics in contact with biological enzymes to produce crucibles, heat exchangers, biological materials such as dental artificial paint joints for smelting metals, and use unique ceramics that capture and absorb neutrons to produce various nuclear reactor structural materials.

Industrial ceramics refer to ceramic products used in various industries. Industrial ceramics can be divided into two categories: ordinary ceramics and special ceramics.

1) Ordinary ceramics

Ordinary ceramics refer to clay ceramics, which are fired in a ratio of clay, feldspar, and quartz. Their performance depends on the purity, particle size, and ratio of the three raw materials. Generally, the texture is hard, corrosion-resistant, non oxidizing, non conductive, and can withstand certain high temperatures with good processing formability.

Application:

In industry, ordinary ceramics are mainly used for electrical ceramics for insulation, chemical ceramics with high requirements for acid and alkali, and ceramics for structural parts with low load-bearing requirements, such as insulators, corrosion-resistant containers, pipelines, and decorative ceramics and tableware in daily life.

2) Alumina ceramics

This ceramic is mainly composed of AL2O3 (with a mass fraction of AL2O3 greater 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; It can also be divided into 75 porcelain, 95 porcelain, and 99 porcelain according to the mass fraction of AL2O3.

Application:

Aluminum oxide ceramics have high melting point, high hardness, high strength, and good resistance to chemical corrosion and dielectric properties. However, due to its high brittleness, poor impact resistance, and thermal shock resistance, it cannot withstand drastic changes in environmental temperature. It can be used to manufacture high-temperature furnace tubes, furnace linings, spark plugs for internal combustion engines, etc. It can also be used to manufacture high hardness cutting tools, and is a good material for manufacturing thermocouple insulation sleeves.

3) Silicon carbide ceramics

The biggest characteristic of silicon carbide ceramics is its high temperature strength, high thermal conductivity, wear resistance, corrosion resistance, and creep resistance. It is often used as a high-temperature sintered material in the fields of national defense, aerospace, and other technological fields, that is, for manufacturing nozzles for rocket tail nozzles, throat nozzles for pouring metal, thermocouple sleeves, furnace tubes, and other high-temperature parts.

Application:

Due to its high thermal conductivity, it can also be used to manufacture high-temperature strength parts such as blades and bearings of gas turbines, as well as materials used as high-temperature heat exchangers and nuclear fuel encapsulation materials.

4) Lithium oxide ceramics

The main crystalline phases of lithium oxide ceramic products are lithium nepheline (Li2O · Al2O3 · 2SiO2) and spodumene (Li2O · Al2O3 · 4SiO2), characterized by low thermal expansion coefficient (-0.03 in the range of 100-1000 ℃) × 10/℃~4.08 × 10/℃), with good thermal shock resistance. Li2O is an external oxide of the network, which has the effect of strengthening the glass network and effectively improving the chemical stability of the glass.