What is nanocrystalline ceramics
Release time:
2024-10-12
Nanocrystalline ceramics is a new material with excellent mechanical and chemical properties. It can be used as wear-resistant structural materials in harsh environments such as high temperature, corrosion, and no lubrication, such as ceramic bearings, mechanical seals, textile ceramics, abrasives, pipes, valves, wear-resistant linings, and chemical fillers. It can improve the reliability and technical content of traditional structural ceramics, and promote machinery manufacturing, chemical industry, metallurgy The technological progress of energy and other related industries is of positive significance. At the same time, nano microcrystalline ceramics are also an excellent electronic structural ceramics, which can replace talc ceramics and alumina ceramics as various insulators, tube sockets, resistance substrates and sealing shells for electronic devices.
What is nanocrystalline ceramics?
Nanocrystalline ceramics is a new material with excellent mechanical and chemical properties. It can be used as wear-resistant structural materials in harsh environments such as high temperature, corrosion, and no lubrication, such as ceramic bearings, mechanical seals, textile ceramics, abrasives, pipes, valves, wear-resistant linings, and chemical fillers. It can improve the reliability and technical content of traditional structural ceramics, and promote machinery manufacturing, chemical industry, metallurgy The technological progress of energy and other related industries is of positive significance. At the same time, nano microcrystalline ceramics are also an excellent electronic structural ceramics, which can replace talc ceramics and alumina ceramics as various insulators, tube sockets, resistance substrates and sealing shells for electronic devices.
Its main advantages are low thermal conductivity, high hardness, compact and uniform structure, wear resistance and corrosion resistance. At the same time, it is an insulator at room temperature and has conductivity at high temperature. It is an excellent solid electrolyte.
History
As early as the 1920s, ZrO2 was used as a refractory for melting glass and smelting steel. After the 1970s, people discovered its crystal phase structural characteristics and electrochemical characteristics, gained a deeper understanding of ZrO2, and developed new structural materials and functional materials on this basis. At present, ZrO2 is applied in aerospace industry, automobile industry, machinery industry, power electronics industry, biomedical industry, building materials and decorative materials. You may have seen ceramic tools, medical teeth, ceramic bearings, engine cams and other parts. It is not a new material, but it has been gradually applied to some new fields in recent years.
Zirconia crystal phase structure and performance ZrO2 has three crystal systems: monoclinic system (m-ZrO2), tetragonal system (t-ZrO2), cubic system (c-ZrO2), and the three crystal systems can convert each other, which will produce a certain proportion of volume expansion and shear strain in the conversion process. Therefore, in the production process (cooling process from high temperature to room temperature) of pure ZrO2 products, cracks and even fragmentation often occur with volume changes.
Later, it was found that the toughness of ceramics can be improved by doping appropriate stabilizer in ZrO2, so the research and application of zirconia phase change toughened ceramics have been developed rapidly. At present, it is mainly used in three types: partially stabilized zirconia (PSZ), tetragonal zirconia polycrystal ceramics (TZP) and zirconia toughened ceramics (ZTC).
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