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首页> 外文期刊>Surface & Coatings Technology >Influence of chemical composition, grain size, and spray condition on cavitation erosion resistance of high-velocity oxygen fuel thermal-sprayed WC cermet coatings
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Influence of chemical composition, grain size, and spray condition on cavitation erosion resistance of high-velocity oxygen fuel thermal-sprayed WC cermet coatings

机译：化学成分，晶粒尺寸和喷涂条件对高速氧燃料热喷涂WC金属陶瓷涂料的空化蚀阻的影响

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摘要

In hydroelectric power station, cavitation erosion (CE) and slurry erosion (SE) damage often occurs in components such as turbine runners, guide vanes, and stay vanes. Such surface damage causes serious problems to the machine because it decreases the power generation efficiency. To protect against such damage, the parts are generally subjected to chromium plating. However, a thick coating is required to ensure long-term CE resistance, which needs more deposition time and is expensive. Recently, WC cermet coatings deposited by high-velocity oxygen fuel (HVOF) thermal-sprayed process have attracted attentions because such coatings provide good CE resistance and thicker coatings can be applied. These coatings have been applied to surfaces of abovementioned parts. Furthermore, WC cermet coatings improve CE resistance by optimizing microstructures. Few studies have been reported on the comprehensive CE characteristics of WC cermet coatings. In this study, the influence of chemical composition (WC-CrC-Ni and WC-CoCr), WC grain sizes, and spray conditions on CE resistance of WC cermet coatings was investigated via the change in volume loss with CE exposure time and SEM observation of damaged surfaces and cross sections. It was found that WC-CoCr coating deposited under higher combustion pressure of 0.8 MPa had superior CE resistance. CE damage mechanism derived on the basis of SEM results revealed that enhanced CE resistance could be achieved by increasing cohesive strength between WC grains (combustion pressure being higher) and by creating a dense microstructure.
机译：在水力发电站中，空化糜烂（CE）和浆料侵蚀（SE）损坏通常发生在涡轮跑道，导叶片等部件中，并保持叶片。这种表面损坏导致机器的严重问题，因为它降低了发电效率。为了防止这种损坏，零件通常对镀铬进行铬。然而，需要厚的涂层来确保长期CE阻力，这需要更多的沉积时间并且是昂贵的。最近，由高速氧气燃料（HVOF）沉积的WC金属陶瓷涂层热喷涂过程引起了护理，因为这种涂层提供了良好的Ce电阻和厚涂层。这些涂层已被施加到上述部分的表面。此外，WC Cermet涂层通过优化微结构来改善Ce阻力。据报道了关于WC Cermet涂料的综合CE特征的研究。在该研究中，通过CE暴露时间和SEM观察的变化，研究了化学成分（WC-CRC-Ni和WC-COCT），WC晶粒尺寸和喷射条件对WC金属陶瓷涂料的CE电阻的影响损坏的表面和横截面。发现沉积在较高燃烧压力下为0.8MPa的WC-COCR涂层具有优异的CE抗性。基于SEM结果的Ce损伤机制显示，通过增加WC晶粒（燃烧压力较高）之间的内聚强度和通过产生致密的微结构来实现增强的Ce阻力。

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