Publication Date:
2014-03-08
Description:
AlPO 4 based coatings were prepared on Ti-6Al-2Zr-1Mo-1V titanium alloy using aluminum phosphate as a binder and Al 2 O 3 /Cr 2 O 3 based mixing particles as the fillers. The microstructure, phase and chemical composition of the coatings were analyzed by SEM, XRD and EDS techniques. The high temperature infrared emissivity values of coated and uncoated titanium samples were tested. The results show that the coating had a higher infrared emissivity value (〉0.8) than titanium substrate (0.15–0.3) in the wide wavelength range of 5–20 mm, which is attributed to the uniform dispersion of high emissivity Al 2 O 3 and Cr 2 O 3 particles in the AlPO 4 binder matrix. The coated titanium samples exhibited excellent oxidation resistance performance with significantly decreased oxidation rates at 600 and 800°C. The mass gain of the coated sample kept at a low and stable constant of 0.15 mg/cm 2 , significantly lower than that of titanium substrate (0.54 mg/cm 2 ) when oxidized at 600°C up to 100 h.
Print ISSN:
1546-542X
Electronic ISSN:
1744-7402
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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