关键词：钢铁;超音速火焰喷涂;侵蚀;扫描电子显微镜
摘 要：Erosion behavior of the high velocity oxy fuel (HVOF) deposited Cr_3C_2-NiCr and WC-Co coatings on boiler tube steels was evaluated. The solid particle erosion study was conducted, using an air jet erosion test rig at a velocity of 26 m/s and impingement angles of 30° and 90°, on uncoated as well as HVOF spray coated boiler tube steels at 250 ℃. The coatings are significantly harder than the substrate steel and less porous. Scanning electron microscopy (SEM) technique was used to analyze the eroded surface. Mass loss of the coatings was found higher than the boiler tube steel.