论文部分内容阅读
采用等离子喷涂技术在45钢基体上制备10%Ni-AT13复合涂层,利用QG-700型球-盘式摩擦磨损试验机在室温干摩擦条件下对其进行了摩擦磨损试验;利用显微硬度计、万能拉伸试验机、扫描电镜(SEM)及X射线衍射仪(XRD)等对涂层的力学性能、微观组织进行了表征分析,并研究了去应力退火(300℃保温3 h)对10%Ni-AT13涂层性能的影响。结果表明:涂层呈典型的层片状结构分布,由熔融区和半熔区组成,涂层与基体之间的结合良好;XRD结果显示涂层有新相Al_2TiO_5和Ni_2O_3生成,退火对涂层的组织成分无影响;与退火前相比,涂层的力学性能得到明显的提高,其中结合强度提高了78.7%、显微硬度提高了43.6%、断裂韧性提高了64.1%;退火后,在摩擦过程中摩擦系数高低变化不大,但波动性减小;涂层的磨损率比退火前小,耐磨性得到了提高。
A 10% Ni-AT13 composite coating was prepared on a 45 steel substrate by plasma spray technique. The friction and wear tests were carried out on a QG-700 ball-and-disk friction and wear tester at room temperature under dry friction. The microhardness Mechanical properties and microstructure of the coatings were characterized and analyzed by SEM, X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray diffraction (XRD) Effect of 10% Ni-AT13 Coating Performance. The results show that the coating is a typical lamellar structure, composed of the molten zone and the semi-molten zone, and the bonding between the coating and the matrix is good. The XRD results show that the coating has a new phase of Al_2TiO_5 and Ni_2O_3, Compared with that before annealing, the mechanical properties of the coating were significantly improved. The bonding strength increased by 78.7%, the microhardness increased by 43.6% and the fracture toughness increased by 64.1%. After annealing, During the process, the friction coefficient does not change much, but the volatility decreases. The wear rate of the coating is smaller than before annealing and the wear resistance is improved.