Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第14卷    第2期    总第59期    2004年2月

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文章编号:1004-0609(2004)02-0199-05
激光熔覆纳米Al2O3等离子喷涂陶瓷涂层
花国然1, 2, 黄因慧1, 赵剑峰1, 王  蕾1, 
田宗军1,张建华1, 张永康3

(1. 南京航空航天大学 机电学院, 南京 210016;
 2. 南通工学院 机械工程系, 南通 226007;
3. 江苏大学 机械工程学院, 镇江 210013
)

摘 要: 采用X射线衍射仪、 扫描电镜和显微硬度计研究了45#钢表面激光熔覆纳米Al2O3改性Al2O3+13%TiO2(质量分数)陶瓷涂层的相组成、微观结构和显微硬度, 同时对涂层的磨损特性进行了考察。 结果表明, 激光重熔区亚稳相γ-Al2O3转变成稳定相α-Al2O3, 熔覆层由粗颗粒α-Al2O3和TiO2以及纳米α-Al2O颗粒组成, 在激光的作用下, 等离子喷涂层的片层状结构得以消除;纳米Al2O3颗粒仍然保持在纳米尺度,填充在涂层的大颗粒之间, 使涂层致密化程度得以提高, 因此纳米Al2O3改性涂层的显微硬度较高,且其耐磨性能明显优于等离子喷涂层。

 

关键字: 纳米Al2O3颗粒; Al2O3; TiO2; 等离子喷涂;复合陶瓷涂层; 激光熔覆

Plasma-sprayed ceramic coating by laser cladding of 
Al2O3 nano-particles
HUA Guo-ran1, 2, HUANG Yin-hui1, ZHAO Jian-feng1, WANG Lei1
TIAN Zong-jun1, ZHANG Jian-hua1, ZHANG Yong-kang3

1. College of Mechanical and Electrical Engineering,
Nanjing University of Aeronautics and Astronautics, 
Nanjing 210016, China; 
2. Department of Mechanical Engineering, 
Nantong Institute of Technology, Nantong 226007, China;
3. College of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China

Abstract: The phase constitution, microstructure and microhardness of Al2O3+13%TiO2(mass fraction) composite ceramic coatings laser-claded by Al2O3 nano-particles on 45# steel were investigated using X-ray diffractometry, scanning electron microscopy and microhardness measurement. Also, wear behavior of the coatings was studied. The results show that the metastable γ-Al2O3 phases in the cladding area transfer into stable phase of α-Al2O3, composite ceramic coating consists of α-Al2O3 and TiO2, and lamellar structure of plasma-sprayed coatings is eliminated after the laser-cladding. A large number of Al2O3 nano-particles are found among the large particles of the ceramic coating and play an important role in improving the density of the ceramic coating. So laser-claded nano-Al2O3 ceramic coating has higher hardness and better wear resistance than plasma sprayed Al2O3+13%TiO2 coating does.

 

Key words: Al2O3 nano-particle; alumina; titania; plasma spraying; composite ceramic coating; laser cladding

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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