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Zirconia resistant ceramic tube
The world's proven zirconium resource is about 19 million tons, and zirconia is usually made from zirconium ore purification. There are three crystals of pure ZrO2 at atmospheric pressure: monoclinic (Monoclinic) zirconia (m-ZrO2), tetragonal zirconia (t-ZrO2) and cubic (Cubic) zirconia (c-ZrO2). The above three crystal forms exist in different temperature ranges and can be converted into each other.
Zirconia ceramic production requirements of high purity, good dispersion performance, particle ultrafine, narrow size distribution of powder, the method of the preparation of many, zirconia purification mainly has chlorination and thermal decomposition, alkali metal oxidation decomposition, lime melting method, plasma arc method, precipitation method, colloid method, hydrolysis method, spray pyrolysis method, etc. The powder processing methods include coprecipitation method, sol-gel method, evaporation method, supercritical synthesis method, microemulsion method, hydrothermal synthesis method and vapor deposition method.
In terms of structural ceramics, zirconia ceramics are widely used in the field of structural ceramics because of their advantages of high toughness, high bending strength and high wear resistance, excellent heat insulation performance and thermal expansion coefficient close to steel. Mainly include: Y-TZP ball grinding, dispersion and grinding medium, nozzle, ball valve seat, zirconia mold, micro fan shaft, optical fiber pin, fiber sleeve, drawing mold and cutting tools, wear-resistant tools, clothing buttons, case and watch band, bracelet and pendant, ball bearing, golf ball light ball bat and other room temperature wear-resistant devices, etc.
In terms of functional ceramics, its excellent high temperature resistance is used as an induction heating tube, refractory material and heating element. Zirconia ceramics have sensitive electrical performance parameters, mainly used in oxygen sensor, solid oxide fuel cell (Solid Oxide Fuel Cell, SOFC) and high temperature heating body. ZrO2 Has a high refractive index (N-21 ^ 22), in the ultra-fine zirconia powder added a certain coloring elements (V2O5, MoO3, Fe2O3, etc.), it can be made into colorful translucent polycrystalline ZrO2 material, like natural gems flashing with colorful light, can be made into a variety of decorations. In addition, zirconia is widely used in thermal barrier coating, catalyst carrier, medical care, health care, refractory materials, textile and other fields.
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