Views:7 Author:Site Editor Publish Time: 2020-05-24 Origin:Site
Alumina has high melting point and boiling point, high hardness, insulator at room temperature and conductivity at high temperature. Alumina has been used as refractory for melting glass and steel since the 1920s. Zirconia ceramics are widely used in structural ceramics because of their high toughness, flexural strength, wear resistance, excellent thermal insulation and even their thermal expansion coefficient close to metal. In this paper, the important properties and mechanism of zirconia ceramics and its application in various fields are introduced.
What is zirconia ceramics?
Important properties and mechanism of zirconia ceramics
Application of zirconia ceramics
Zirconium dioxide is the main oxide of zirconium. Usually, it is a white, tasteless and tasteless crystal, insoluble in water, hydrochloric acid and dilute sulfuric acid. It usually contains a small amount of hafnium dioxide. Chemical properties are inactive, with high melting point, high resistivity, high refractive index and low thermal expansion coefficient. Therefore, zirconia ceramics made of zirconia have excellent toughness, impact resistance, high-speed operation without damage, excellent wear resistance, higher density than other ceramic grinding media, higher efficiency than the main natural grinding. Based on the above excellent quality, zirconia ceramics can be said to be a very "suitable" grinding medium. As a new type of ceramic material, zirconia has excellent physical and chemical properties. It is an important raw material for refractories, high temperature structural materials, biological materials and electronic materials. It is also widely used in industrial production.
1. Melting point
The melting point of zirconia is 2715 C. High melting point and chemical inertia make zirconia a a better refractory.
2. High hardness and good wear resistance
They are widely used in cold forming tools and drawing dies because of their high strength and good wear resistance.
3. Strength and tenacity
They have greater strength, toughness and some metals have larger gap, but compared with other ceramic materials, zirconia ceramics in the "ceramic ring" are outstanding.
4. Low thermal conductivity and high thermal expansion coefficient
The thermal conductivity of zirconia is the lowest in common ceramics, and its thermal expansion coefficient is close to that of metal. Therefore, zirconia ceramics are suitable for structural ceramics.
Among structural ceramics, zirconia ceramics are widely used in structural ceramics because of their high toughness, high flexural strength, high wear resistance, excellent insulation and thermal expansion coefficient close to steel. The main parts are: Y-TZP grinding ball, dispersed grinding medium, nozzle, ball seat, zirconia mould, micro-fan shaft, optical fiber plug-in, optical fiber sleeve, wire drawing die and cutting tool, wear-resistant cutter, case and strap, bracelet and pendant, ball bearing, light golf ball rod and other room temperature wear-resistant parts.
In functional ceramics, its excellent high temperature resistance is used as induction heating tubes, refractories and heating elements. They have sensitive electrical properties and are mainly used in oxygen sensors, solid oxide fuel cells and high temperature heaters. ZrO 2 has high refractive index. By adding some coloring elements to the ultrafine zirconia powder, it can be made into polychromatic translucent polycrystalline ZrO 2 material, which shines like natural gemstones and can be made into various decorations. In addition, zirconia is widely used in thermal insulation coatings, catalyst carriers, medical, health care, refractories, textiles and other fields.
Zirconia ceramics are widely used in aerospace industry, mechanical engineering, communications, electronics, automobile, metallurgy, energy, chemical industry and other industries because of their unique electrical properties, such as high temperature resistance, corrosion resistance, wear resistance and metals. Industry, biology and other fields, is an industrial technology, especially cutting-edge technology. The indispensable key material is the main direction of the development of modern materials. With the improvement of people's living standard, the market scope of zirconia ceramics will continue to expand. Therefore, if you want to know more about zirconia ceramics and other related products, please consult us in time.