In this work, high velocity oxy fuel (HVOF) method based spray coatings namely Cr₃C₂-25NiCr and WC-10Co-4Cr have been deposited on AISI304 turbine steels. An attempt has been made to analyze the coatings under accelerated slurry erosion conditions by employing a laboratory-developed slurry erosion testing set-up. The testing has been performed under varied conditions of slurry concentration, impact velocity and impact angle using the Taguchi approach. The microstructure of coating powder, erodent particles and deposited coatings have been studied using a scanning electron microscope (SEM) analysis. Erosion tests indicated that HVOF-spray Cr₃C₂-25NiCr and WC-10Co-4Cr coatings have been deposited on AISI304 steel exhibited significant improvements in the erosion resistance of AISI304 steel. The possible reason for such behaviour could be higher microhardness of HVOF-spray coatings in comparison with AISI304 bare steel. From SEM images of the samples taken prior and post slurry erosion tests, it has been observed that Cr₃C₂-25NiCr coating exhibited mixed (ductile and brittle) behaviour, though the WC-10Co-4Cr coating mostly demonstrated ductile behavior under conditions for erosion from the slurry. Apart from that, an attempt has been made to develop a functional equation based on the regression approach which could be employed to assess the erosion wear rate under a set of conditions. The predicted erosion wear results under varied conditions are in close relationship to experimental values.

中文翻译：

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HVOF喷涂Cr3C2-25NiCr和WC-10Co-4Cr涂层涡轮钢在不同浆液腐蚀条件下的摩擦学研究

在这项工作中，基于高速氧燃料（HVOF）方法的喷涂层即Cr ₃ C ₂ -25NiCr和WC-10Co-4Cr已沉积在AISI304涡轮钢上。已经尝试通过使用实验室开发的浆料侵蚀测试装置来在加速的浆料侵蚀条件下分析涂层。使用田口方法在不同的泥浆浓度，撞击速度和撞击角度条件下进行了测试。涂层粉末，腐蚀颗粒和沉积涂层的微观结构已使用扫描电子显微镜（SEM）分析进行了研究。冲蚀测试表明，HVOF喷涂Cr ₃ C ₂-25NiCr和WC-10Co-4Cr涂层已沉积在AISI304钢上，显示出AISI304钢的耐蚀性显着提高。与AISI304裸钢相比，这种行为的可能原因可能是HVOF喷涂涂层的显微硬度更高。从在浆料侵蚀试验之前和之后获得的样品的SEM图像中，已经观察到Cr ₃ C ₂-25NiCr涂层表现出混合的（韧性和脆性）行为，尽管WC-10Co-4Cr涂层在从泥浆中侵蚀的条件下大多表现出韧性。除此之外，已经尝试开发基于回归方法的功能方程，该方程可用于评估一组条件下的侵蚀磨损率。在不同条件下的预计腐蚀磨损结果与实验值密切相关。