Physical characteristics of Atmospheric Plasma Sprayed (APS) Alumina coating and Low Pressure Plasma Sprayed (VPS) Alumina coating were investigated. High purity Alumina powder was used for thermal spraying in this test. As electrical properties, the volume resistivity, dielectric constant, and the dielectric breakdown voltage were measured at R.T. to 873K. And the coefficient of thermal expansion, and the thermal conductivity were measured at also R.T. to 873K, as thermal properties. Mechanical properties, such as the Young’s modulus, the bending strength, and the cross-sectional hardness value were measured at R.T. As a test result, the Alumina coatings using both APS and VPS have similar properties except for the cross-sectional hardness value that was higher when sprayed by VPS.

alumina coating, bending strength, coefficient of thermal expansion, dielectric breakdown voltage, dielectric constant, hardness, plasma spraying, thermal conductivity, volume resistivity, Young’s modulus
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Copyright © 2004 ASM International. All rights reserved.
2004
ASM International
Topics
Alumina ceramics Plasma spray coating Dielectric breakdown voltage Dielectric constant Bend strength Elastic modulus Hardness Thermal conductivity Coefficient of thermal expansion
Issue Section:
Characterization Methods for Coating Properties
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