Microstructure and Wear Resistance of Electrodeposited RE–Ni–Mo–P–B 4 C–PTFE Composite Coatings

Abstract

The structure, hardness and wear resistance of RE–Ni–Mo–P–B₄C–PTFE composite coatings were studied using XRD, SEM, an MM2000 abrasion tester and an HX-1 microhardness tester. Results show that the structure of the composite coatings experiences a transformation process from amorphous to mixture and then to crystalline as the heat treatment temperature rises. The crystal particles of the coatings become increasingly fine with the addition of B₄C, B₄C+PTFE and B₄C+RE. The hardness and wear resistance of RE–Ni–Mo–P–B₄C–PTFE composite are raised with increasing heat treatment temperature, reaching peak values at 400°C and 300°C, respectively. The wear resistance of the composite coatings is greatly superior to that of other traditional coatings. SE/511