Perfluoroalkoxy (PFA) is a type of fluoropolymer with properties similar to polytetrafluoroethlene (PTFE). It is a kind of perfect self-lubncating material due to its very low friction coefficient, good high-temperature stability and chemical stability. Yet, it cannot be used as anti-wear materials alone because of its poor mechanical properties, bad thermal conductivity and high wear rate. Multiwall carbon nano-fiber (MWCNF) is expected to be a new functional material having high electrical conductivity, thermal conductivity, chemical stability and mechanical strength. It is widely used as fillers in composite materials, particularly lightweight polymer-matrix composites. PFA reinforced MWCNF composite coating is expected to be used in applications requiring low friction and wear situations. In this study, mechanical alloying technique using mechanochemical reaction was applied to prepare the thermal spraying powder of PFA resin matrix composite covered with MWCNF. The composite powder containing 0, 1, 3 and 5 mass% MWCNF was deposited on mild steel substrate by the powder flame spraying. Influence of the MWCNF content and difference of the powder flame spraying conditions, such as preheating temperature of substrate, on the microstructure and friction coefficients are examined. Experimental results revealed that reduced wear of the MWCNF-PFA composite coating compered to PFA coating.
