Microstructure and surface amorphous phase formation induced by sliding wear of the Fe-Cr-B alloy thick film coatings fabricated by detonation gun process

摘要

Thermal spray coating layers were prepared on thecarbon steel plates with iron-chrome-boron alloy powders using adetonation gun under various fuel gas contents. The coating layerwas composed of Fe rich Fe-Cr solid solution and (Cr; Fe)xBparticles, which had relatively a low friction coefficient such as0.05 and showed high wear resistance. The transition fromcrystalline to amorphous phase occurred during the wear treatment.TEM observation revealed that Fe-Cr solid solution phase withsuper-saturated B and Si was one of the main contributors for thetransition. Oxide inclusions formed at an excess fuel gas conditionmay impede the crystalline to amorphous transition by loweringthe solute content in Fe-Cr solid solution phase.