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首页> 外文期刊>Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear >A comparative study on slurry and dry erosion behaviour of HVOF sprayed WC-CoCr coatings
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A comparative study on slurry and dry erosion behaviour of HVOF sprayed WC-CoCr coatings

机译：HVOF喷涂WC-CoCr涂层的浆液和干蚀行为的比较研究

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摘要

In the present study, slurry and dry erosion behavior of HVOF sprayed WC-CoCr cermet coatings has been studied. The coatings were developed using the powders feedstock having WC grains in conventional and fine structured sizes. The slurry erosion testing was performed using a laboratory made pot-type slurry erosion tester. The dry erosion testing was carried out using air-jet erosion test rig (ASTM G76-07), at an impact velocity of 60 m/s and 90° impact angle. The rate of dry erosion was significantly high as compared to that of slurry erosion and it was mainly due to the particle-target impact velocities and impact angle. The mechanism of material removal in slurry and dry erosion was studied and discussed on microstructural investigations and was found to be different in both the erosion conditions. The morphology of eroded surface shows crater, lip and groove formation in the binder matrix, carbide fracturing, chipping, and pullout as visible mechanism of material removal. It was observed that the cermet coating with fine WC grain exhibits higher erosion resistance as compared to conventional cermet coating due to its improved properties like micro-hardness and fracture toughness.
机译：在本研究中，已经研究了HVOF喷涂的WC-CoCr金属陶瓷涂层的浆液和干蚀行为。使用具有常规尺寸和精细结构尺寸的WC晶粒的粉末原料对涂层进行显影。使用实验室制造的罐式浆料侵蚀测试仪进行浆料侵蚀测试。使用空气侵蚀腐蚀试验机（ASTM G76-07）以60 m / s的撞击速度和90°的撞击角进行干法侵蚀试验。与泥浆侵蚀相比，干蚀速率显着较高，这主要是由于颗粒目标的撞击速度和撞击角度所致。在微观结构研究中研究并讨论了泥浆中物料去除和干法腐蚀的机理，发现这两种腐蚀条件都不同。腐蚀后的表面形态表明，粘合剂基体中形成了缩孔，唇部和凹槽，碳化物破裂，碎裂和拔出，这是材料去除的可见机制。观察到，由于具有改善的性能如显微硬度和断裂韧性，与常规的金属陶瓷涂层相比，具有细的WC晶粒的金属陶瓷涂层表现出更高的耐腐蚀性。

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