Abstract The boiler tubes, steam and gas turbines are commonly affected by severe high-temperature erosion wear due to impingement of solid particles entrained in the stream of fluid. The investigation focuses on the applicability of thermal sprayed WC based coatings for turbines and boiler tubes by improving the erosion resistance of the base material. The present work includes high-temperature solid particle erosion behaviour of WC-Cr3C2–Ni coatings deposited by atmospheric plasma spray (APS) and high-velocity oxy-fuel (HVOF) processes. The effects of temperature and impact angle on erosion performance of uncoated and coated specimens were comparatively studied using air-jet erosion tester (ASTM G76 ). The eroded surface morphology was analysed using a scanning electron microscope (SEM). Uncoated steel exhibit ductile mechanisms; however, both coated specimens follow the mixed mode of material removal under the same operating conditions. Erosion resistance of APS and HVOF coatings is approximately two and three times higher than uncoated specimens at higher temperatures under 30° and 90° impact angles. The HVOF coating offers higher erosion resistance than APS coating due to lower porosity, greater splat adhesion, a lower degree of decarburisation and higher inter-splat sintering at elevated temperatures.

中文翻译：

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SS 316L 和热喷涂 WC-Cr3C2-Ni 涂层的高温固体颗粒侵蚀行为

摘要 锅炉管、蒸汽轮机和燃气轮机由于流体流中夹带的固体颗粒的撞击，通常会受到严重的高温冲蚀磨损的影响。研究的重点是通过提高基材的抗侵蚀性，热喷涂 WC 基涂层在涡轮机和锅炉管上的适用性。目前的工作包括通过大气等离子喷涂 (APS) 和高速氧燃料 (HVOF) 工艺沉积的 WC-Cr3C2-Ni 涂层的高温固体颗粒侵蚀行为。使用空气喷射侵蚀试验机（ASTM G76）比较了温度和冲击角对未涂层和涂层试样侵蚀性能的影响。使用扫描电子显微镜（SEM）分析侵蚀的表面形态。无涂层钢表现出延展性机制；然而，在相同的操作条件下，两种涂层试样都遵循材料去除的混合模式。在 30° 和 90° 冲击角下，在较高温度下，APS 和 HVOF 涂层的抗腐蚀性能大约是未涂层试样的两倍和三倍。HVOF 涂层比 APS 涂层具有更高的耐腐蚀性，因为它具有更低的孔隙率、更大的飞溅附着力、更低的脱碳程度和更高的高温下飞溅间烧结。