Structure and properties of electrodeposition RE-Ni-W-B-B₄C-PTFE composite coating

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ÎÄÕÂÒ³Â룺425 - 429

Key words£ºelectrodeposition£» RE-Ni-W-B-B4C-PTFE composite coating£» structure£» properties

Abstract: The components, surface and cross sectional morphologies, and the effects of heat treatment temperature on phase structure, hardness, abrasion resistance and oxidation resistance of pulse electrodeposition RE-Ni-W-B-B₄C-PTFE composite coatings, were all investigated. The results show that W and B contents increase in the RE-Ni-W-B composite coating by using pulse electrodeposition. RE, PTFE and B₄C particles can be co-deposited into the Ni-W-B composite coating, but the amount is very little. X-ray diffraction analysis displays that the RE-Ni-W-B-B₄C-PTFE composite coating is mainly amorphous, partially crystallized as-deposited, but it turns into crystalline state and PTFE in the coatings will decompose after the heat treatment temperature is higher than 400¤@¡æ. The hardness of the composite coating increases with increasing heat treatment temperature, it comes up to the highest value at 400¤@¡æ. The oxidized film mass of the composite coating increases slowly when the oxidation temperature is lower than 500¤@¡æ, but it increases linearly and sharply after the oxidation temperature is higher than 600¤@¡æ.

»ù½ðÐÅÏ¢£ºthe National Development and Reform Commission of China