cr2o3陶瓷涂层摩擦磨损性能分析word格式论文.docxVIP

摘要Cr2O3陶瓷涂层在摩擦过程中产生的热应力比较小，涂层不容易发生严重断 裂，具有孔隙率低、摩擦系数低、导热系数高、耐腐蚀性、高硬度等特性，适用 于高温、腐蚀和磨损等特殊工作环境，涂层在摩擦学领域具有广阔的应用前景。 因此，研究其工艺及摩擦磨损机理具有重要意义。本文所用喷涂粉末是将 Cr2O3 陶瓷粉末与玻璃釉料分别按质量比 65%，80%， 85%，95%,100%混合，烧结 900℃后球磨，过 200 目筛即可。采用 CP-3000 型 亚音速喷枪在 45 钢上分别喷涂各比例的 Cr2O3 陶瓷涂层，并在电阻炉中烧结 1066℃。在室温下对 Cr2O3 陶瓷涂层进行摩擦实验，结合扫描电镜(SEM)、体式 显微镜等手段，观察其磨损前后涂层的表面形貌，对摩擦磨损性能进行了分析和 研究。同时采用 ANSYS 软件模拟研究了热喷涂陶瓷涂层上不同扁平率的单个粒 子受到切向摩擦力时，界面的应力分布。实验结果表明:（1）喷涂距离为 150mm-300mm 时，Cr2O3 陶瓷涂层的摩擦磨损性能随喷涂 距离的增大而加强。热喷涂时最佳工艺参数为:压缩空气压力为 0.36MPa，氧气 压力为 0.5 MPa，乙炔压力为 0.05 MPa，预热温度为 400℃，喷涂距离为 150mm。（2）Cr2O3 陶瓷涂层的质量损失和质量损失比均随玻璃釉料的添加量而先减 后增。实验结果表明比例为 95%左右时 Cr2O3 陶瓷涂层的摩擦磨损性能最好。（3）Cr2O3 陶瓷涂层质量损失随着载荷的增大，先减后增，随时间的增加而 增大，且时间对 Cr2O3 陶瓷涂层质量损失的影响更大。（4）涂层上粒子的扁平化程度越好，Cr2O3 陶瓷涂层的摩擦磨损性能也就越 好。（5）Cr2O3陶瓷涂层的磨损机理为轻微的磨粒磨损和轻微的脆性剥落共同作 用。（6）当热喷涂Cr2O3陶瓷涂层受到切向力摩擦时，粒子扁平化良好的涂层界 面法向应力与剪切应力都较小，粒子不易出现剥落，涂层具有良好的耐磨性能。关键词: Cr2O3 陶瓷涂层；玻璃釉料；热喷涂；摩擦磨损；ANSYS 分析VStudy on the friction and wear performance of Cr2O3 coatingABSTRACTWith the excellent wear resistance, corrosion resistance, and high hardness characteristics, thermal spray Cr2O3 ceramic coatings apply to special work environment, such as high temperature, corrosion and wear . The thermal stress of coatings is small during the process of friction, and the coatings are not prone to serious fracture.So they have a broad application prospect in the field of tribologyand be used widely in aerospace, biological engineering, electronic information, building and other fields. In practical applications, the friction and wear is still one of the important factors leading to the invalid Cr2O3 ceramic coatings. Therefore, the processing technology of ceramic coating Cr2O3, friction and wear properties and mechanism is of great significance.The spraying powder used in this article was mixed powder,which is made by the Cr2O3 powder and glass ceramic glaze with the mass ratio of 65%, 80%, 85%, 95%,100%, sintered 900℃, ball milled, and sieved 200 mesh. The power was spraied onthe 45 steel, respectively by the CP - 300