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用电弧离子镀技术在W18Cr4V高速钢试样上制备了CrN涂层,采用X射线衍射仪、扫描电镜、能谱议、显微硬度仪、磨损试验机等对涂层的表面形貌、相结构、硬度和耐磨性进行了分析。对比研究了经工艺优化后的CrN涂层和TiN、TiAlN涂层以及未涂层钻头干式钻削7075铝合金的切削性能,得出了最佳的沉积偏压和切削转速。结果表明,偏压为-50~-150 V时,涂层均由Cr2N相和CrN相组成,随偏压增加,涂层表面粗糙度降低,硬度和耐磨性增强;偏压过高,涂层的微观质量和性能反而下降。偏压为-100 V时,涂层的硬度和耐磨性最佳。CrN涂层可显著提高高速钢刀具的切削性能,减小刀具磨损,延长刀具寿命。其钻削性能优于TiN、TiAlN涂层,明显优于未涂层。2 230 r/min为CrN涂层的最佳切削转速,经工艺优化后的CrN涂层钻头平均寿命约为未涂层钻头的5倍,其破损机制属于粘着磨损。
The CrN coating was prepared on the W18Cr4V high-speed steel by arc ion plating. The surface morphology and phase structure of the coating were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, microhardness tester and wear tester. , Hardness and wear resistance were analyzed. The cutting performance of dry-process 7075 aluminum alloy with CrN coating, TiN, TiAlN coating and uncoated drill bit was optimized and compared. The optimum deposition bias and cutting speed were obtained. The results show that the coatings are composed of Cr2N phase and CrN phase at a bias voltage of -50 ~ -150 V. With the increase of bias voltage, the surface roughness of the coating decreases, and the hardness and wear resistance increase. The micro-layer quality and performance decline. At -100 V bias, the coating has the best hardness and wear resistance. CrN coating can significantly improve high-speed steel cutting tool cutting performance, reduce tool wear and prolong tool life. The drilling performance is better than TiN, TiAlN coating, significantly better than the uncoated. 2 230 r / min is the best cutting speed of CrN coating. The optimized CrN coating drill bit life expectancy is about 5 times that of uncoated drill bit, and the damage mechanism is adhesive wear.