汽轮机末级叶片用SP-700钛合金AlCrN涂层结构与性能研究  

Study on Structure and Properties of AlCrN Coating on SP-700 Titanium Alloy for Last Stage Blades in a Steam Turbine

作　　者：李聪[1] 聂冰悦 任延杰[1] 李微[1] 陈维 周立波 陈荐 LI Cong;NIE Bingyue;REN Yanjie;LI Wei;CHEN Wei;ZHOU Libo;CHEN Jian(School of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学能源与动力工程学院,长沙410114

出　　处：《动力工程学报》2023年第12期1549-1556,1584,共9页Journal of Chinese Society of Power Engineering

基　　金：湖南省自然科学基金资助项目(2022JJ30597);国家自然科学基金资助项目(51775055)。

摘　　要：为了探究基体负偏压对离子镀涂层结构与性能的影响,采用3种不同工艺在SP-700钛合金表面沉积了AlCrN薄膜。利用扫描电子显微镜(SEM)、光学显微镜、X射线衍射仪(XRD)、维氏显微硬度计、往复摩擦磨损实验仪、白光干涉三维表面轮廓仪和电化学工作站测试了涂层的形貌、物相组成、显微硬度、耐磨性能及电化学腐蚀性能;通过浸泡腐蚀方法测定了涂层在质量分数为5%的HF溶液中的腐蚀行为。结果表明:离子镀涂层表面致密,主要由立方(Cr, Al)N相和立方Al相组成,显微硬度较高;摩擦磨损过程中,涂层摩擦因数低,工艺2样品的磨损量最小,相对耐磨性可达902.26;AlCrN涂层在质量分数为3.5%的NaCl溶液中的电化学腐蚀性能与钛合金基体相近;AlCrN涂层在HF溶液中具有更好的耐腐蚀性能。In order to investigate the effect of substrate negative bias voltage on the structure and properties of the ion plating coatings,AlCrN films were deposited on SP-700 titanium alloy by three different ion plating processes.The morphology,phase composition,micro-hardness,wear resistance and electrochemical corrosion resistance of the coatings were measured by means of scanning electron microscopy(SEM),X-ray diffraction(XRD),Vickers microhardness tester,reciprocating friction and wear tester,white light interference 3D surface profiler and electrochemical workstation.The corrosion behavior of the coating in HF solution with mass fraction of 5%was measured by immersion corrosion method.Results show that the surface of the ion plating coating is compact,mainly composed of cubic(Cr,Al)N phase and cubic Al phase,and its microhardness is high,the friction coefficients of the coatings are lower during friction and wear process,the wear mass loss of the specimen in the process 2 is the smallest,and the relative wear resistance reaches 902.26.The corrosion resistance of AlCrN coating in NaCl solution with mass fraction of 3.5%is similar to that of titanium alloy substrate.The corrosion resistance of AlCrN coating in HF solution is better.

关 键 词：SP-700钛合金 AlCrN涂层 摩擦磨损 耐腐蚀性能 

分 类 号：TK265[动力工程及工程热物理—动力机械及工程]