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       Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. Alumina coatings can be used as low-stress abrasive wear at ambient temperatures, hard surface wear, resistance to various chemical media and chemical gas corrosion, and cavitation resistance. And erosion coatings, also for high temperature resistant gas cavitation, thermal barriers, high temperature abradable coatings and high temperature emissive coatings. Zirconia ceramics have high toughness, high flexural strength and high wear resistance, excellent thermal insulation properties, thermal expansion coefficient close to that of steel, zirconia in thermal barrier coating, catalyst carrier, medical, health care, refractory, textile Other fields are being widely used.