CAJ | 학술논문

超音速火焰喷涂过程中产生的残余应力会限制涂层的厚度。在研究中，为了获得高质量WC-Co厚涂层，在超音速火焰喷涂过程中采用了干冰冲击技术，这主要是由于干冰冲击对涂层产生了高效冷却和机械锤平。本研究采用X射线衍射，扫描电镜和能谱能对粉末和涂层得微观结构和相分布进行表征。此外，本文对涂层的硬度、抗滑动摩擦等性能也进行了研究。最后我们得出结论，干冰冲击能有效地细化晶粒尺寸，提高涂层硬度，致密度和抗滑动摩擦性能。本研究采用超音速火焰喷涂和干冰冲击联合的工艺方法喷涂WC-Co粉末，以提高冷却效率和喷涂过程中的类喷丸效应。该方法也可以用来制备厚的WC-Co涂层。本文还研究了涂层的微观组织、相组成和摩擦磨损性能。
초음속화염분도과정중산생적잔여응력회한제도층적후도。재연구중，위료획득고질량WC-Co후도층，재초음속화염분도과정중채용료간빙충격기술，저주요시유우간빙충격대도층산생료고효냉각화궤계추평。본연구채용X사선연사，소묘전경화능보능대분말화도층득미관결구화상분포진행표정。차외，본문대도층적경도、항활동마찰등성능야진행료연구。최후아문득출결론，간빙충격능유효지세화정립척촌，제고도층경도，치밀도화항활동마찰성능。본연구채용초음속화염분도화간빙충격연합적공예방법분도WC-Co분말，이제고냉각효솔화분도과정중적류분환효응。해방법야가이용래제비후적WC-Co도층。본문환연구료도층적미관조직、상조성화마찰마손성능。
The residual stresses arising during High Velocity Oxy-Fuel(HVOF) thermal-spraying process usually limit the building up of thick coatings. In this work, dry-ice blasting was combined to HVOF process to deposit high quality thick WC-Co coatings, since it induces to efficient cooling and mechanical peening, etc. Several techniques, including X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy, were used to characterize the microstructures and phase distribution of the powders and coatings. In addition, mechanical properties such as hardness and sliding wear resistance were investigated. HVOF sprayed WC-Co coating using dry-ice blasting is characterized by compact construction, grain refinement, high hardness as well as outstanding sliding wear resistance.