Abstract

In the present work, we investigated the effectiveness of microwave processing and thermal spraying for developing tungsten carbide (WC)-based erosion-resistant claddings. The microwave cladding showed a columnar structure with a well-bonded interface compared to discrete splat morphology and discontinuous interface of the thermal spray coating. The cladding showed a lower hardness (800 HV) compared to thermal spray coating (1,300 HV) and a two times higher fracture toughness due to the absence of splat boundaries and pores. The microwave cladding also showed 14 times and 10 times higher cavitation erosion resistance than thermal spray coating and SS316L substrate steel, respectively. The improved cavitation erosion resistance of the microwave cladding is explained on the basis of the optimized combination of hardness and fracture toughness. The surface of eroded cladding showed plastically deformed micropits compared to the thermal spray coatings, which showed large craters. Results show that microwave claddings can help improve the durability of engineering systems.

摘要

在目前的工作中，我们研究了微波处理和热喷涂在开发碳化钨 (WC) 基耐腐蚀覆层方面的有效性。与热喷涂涂层的离散碎片形态和不连续界面相比，微波熔覆显示出具有良好结合界面的柱状结构。与热喷涂涂层 (1,300 HV) 相比，该覆层显示出较低的硬度 (800 HV)，并且由于不存在板状边界和孔隙，因此断裂韧性高出两倍。微波熔覆还表现出比热喷涂涂层和 SS316L 基材钢分别高 14 倍和 10 倍的抗空蚀性。基于硬度和断裂韧性的优化组合解释了微波熔覆层抗空蚀性能的提高。与热喷涂涂层相比，侵蚀包层的表面显示出塑性变形的微坑，后者显示出大坑。结果表明，微波覆层有助于提高工程系统的耐用性。