摘要
运用激光熔覆技术在 40Cr钢表面制备了 (TiO2 +B2 O3+Al2 O3+TiB2 ) /NiCrAl金属陶瓷涂层 ,其中的TiB2 和Al2 O3 陶瓷颗粒在激光加工过程中原位反应生成 ;对熔覆层的组织、物相、元素分布和显微硬度分布特征进行了分析研究 ;熔覆层中的主相依次分别是γ Ni,γ′ ,Al2 O3 和TiB2 ,熔覆层的微观结构和硬度主要和激光处理参数和熔覆层化学组成有关[1～ 9] ;陶瓷相的原位生成和加入 ,大大改善了熔覆层的硬度和覆层 /基体界面的结合性能。
A (TiO 2+B 2O 3+Al 2O 3+TiB 2)/NiCrAl metal\|ceramic coating was fabricated on a steel (Chinese brand 40Cr) surface by laser. TiB 2, Al 2O 3 were introduced by an in\|situ reaction of Al, B 2O 3 and TiO 2 during laser cladding process. The microstructure, phase, element distribution and micro\|hardness were analyzed with the aid of microscope, X\|ray diffraction, electron probe and micro\|hardness tester. Experimental results show that the γ Ni,γ′, Al 2O 3 and TiB 2 are the dominant phases in the cladding zone. Laser processing parameters as well as the chemical composition of coatings determine the microstructure and hardness of the cladding layer. The hardness and the boundary strength are significantly enhanced due to the presence of ceramic in the coating. [
出处
《中国工程科学》
2001年第10期64-71,共8页
Strategic Study of CAE
基金
国家教委基金资助项目 ( 980 0 11)
