及其耐腐蝕性能
趙劍峰2, 田宗軍2， 王 蕾2，張永康3
( 1. 南通工學(xué)院 機(jī)械工程系, 南通 226007;
2. 南京航空航天大學(xué) 機(jī)電工程學(xué)院, 南京 210016;
3. 江蘇大學(xué) 機(jī)械工程學(xué)院, 鎮(zhèn)江 210013)
摘 要: 以納米Al2O3粉末為填料, 采用激光重熔等離子噴涂陶瓷涂層技術(shù), 在45號(hào)鋼表面制備了納米改性Al2O3+13%（質(zhì)量分?jǐn)?shù)）TiO2/nano-Al2O3復(fù)合陶瓷涂層。用X射線衍射儀、 掃描電鏡研究了納米Al2O3改性后的陶瓷涂層的組織及涂層的耐腐蝕性能。結(jié)果表明, 在激光的作用下, 原等離子噴涂層Al2O3+13%TiO2的片層狀組織得以消除；激光重熔區(qū)亞穩(wěn)相 γ-Al2O3轉(zhuǎn)變?yōu)榉�(wěn)定相α-Al2O3, 重熔層由α-Al2O3和TiO2組成。 與等離子噴涂Al2O3及Al2O3+13%TiO2陶瓷涂層相比, 納米Al2O3改性后的Al2O3+13%TiO2/nano-Al2O3陶瓷涂層致密化程度明顯提高, 耐腐蝕性能也得到了明顯的改善。
關(guān)鍵字: 納米Al2O3顆粒; TiO2; 等離子噴涂; 激光重熔; 微觀組織; 腐蝕
ZHAO Jian-feng2, TIAN Zong-jun2,
WAN Lei2, ZHANG Yong-kang3
（ 1. Department of Mechanical Engineering,
Nantong Institute of Technology,
Nantong 226007, China;
2. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and
Astronautics, Nanjing 210016, China;
3. College of Mechanical Engineering,
Jiangsu University, Zhenjiang 212013, China）
Abstract: Using nano-Al2O3 powder material as the coating stuff, laser was employed to remelt the plasma spraying coating. Composite ceramic coating of Al2O3＋13%TiO2/nano-Al2O3 was formed on 45# steel surface. The microstructure of laser-remelting nano-Al2O3 composite ceramic coating was investigated by using X-ray diffraction and scanning electronmicroscopy, and the corrosion behavior of the coatings was studied. The results show that lamella structure characteristic of plasma-sprayed coatings is eliminated after the laser-remelting. The metastable γ-Al2O3 in the remelting area transfers into stable phase of α-Al2O3 and composite ceramic coating consists of α-Al2O3 and TiO2 on Al2O3+13%TiO2/ nano-Al2O3 coatings. So laser-remelting nano-Al2O3 ceramic coating has higher densification and better corrosion resistance than plasma sprayed Al2O3 and Al2O3+13%TiO2 coatings does.
Key words: nano-Al2O3 particle; titania; plasma-spraying; laser remelting; microstructure; corrosion behavior
