Alumina ceramic is a very common and important ceramic material with Al2O3 as the main raw material. Al2O3 has a variety of isomorphous crystals. Common crystal forms include α, β, γ, θ, etc., but they will all be converted into α-Al2O3 at high temperatures.
Phase transformation of Al(OH)3 during heating
α-Al2O3 is the most stable crystal form of all Al2O3, and its stability is closely related to its crystal structure.
Crystal structure of α-Al2O3
α-Al2O3 has a series of excellent properties, so making α-Al2O3 into alumina ceramics has a very long history.
Typical properties of α-Al2O3
The excellent properties of alumina ceramics make it one of the most widely used ceramics, and it plays an important role in structural ceramics, refractory ceramics, optical ceramics, electronic ceramics, and bioceramics.
Typical properties of alumina ceramics
Functions and applications of alumina ceramics
Alumina ceramics have many practical properties and functions such as thermal stability, chemical stability, piezoelectricity, corrosion resistance, electrical insulation, chemical adsorption, biological adaptability and light transmittance.
Functions of alumina ceramics
Mechanical applications
Alumina ceramic sintered products can reach 270MPa, and hot-pressed sintered products can reach 480MPa. Because of their good anti-wear properties, they are widely used in ceramics, manufacturing cutting tools, grinding wheels, bearings and other industries. This is the case in Al2O3 ceramic cutting tools and industry The most widely used.
Electronics and Electricity Applications
It is the most widely used alumina transparent ceramic and substrate in electronics, electricity, alumina ceramic substrates, floors, transparent ceramics and various alumina ceramics, ceramic parts, electronic materials, magnetic materials, etc.
Chemical Engineering Applications
In chemical applications, alumina ceramics also have many uses, such as alumina ceramic corrosion-resistant coatings and chemical filler balls, among which alumina ceramic films and silicon steel grade coatings are researched and applied.
Medical applications
Alumina ceramics have good biocompatibility, bioinertness, stability, high hardness, and high wear resistance, and are often used in the preparation of artificial bones and artificial joint materials.
Applications in building sanitary ceramics
Alumina ballsGrinding media has good hardness, moderate density, wear resistance and low price, etc., so most of the raw materials used in the construction of sanitary ceramics are mechanical processing of alumina ball grinding media .
Other applications
In the gem industry, rubies and sapphires are aluminum oxide crystals containing trace amounts of impurities. Artificial gemstones can be used as a variety of wear-resistant components. Doped sapphires can also be used as optical activation components of solid-state lasers.
In particular, the functional properties of alumina ceramics such as light transmission, wave transmission, and laser have been increasingly used in high-tech fields such as energy, military industry, machinery, electronics, and medicine.
Research and application of alumina ceramic materials in the field of new energy
In recent years, due to the increasingly serious global energy shortage and environmental problems, all countries have increased their investment in new energy vehicles. It has almost become an inevitable trend for new energy vehicles to replace fuel vehicles. In 2018, the penetration rate of China's new energy vehicle industry was 3.73%, and the potential market space is huge.
Domestic new energy vehicle production continues to rise (10,000 units)
Data source: Compilation of public information
China’s new energy vehicle sales and penetration rate from 2010 to 2018
Data source: Compilation of public information
With the explosion of the new energy industry, especially new energy vehicles, alumina ceramic materials will surely make great strides in the new energy field with their excellent physical and chemical properties.
