Influence of additive silica on the laser melting of the ceramic coatings

IMR OpenIR

	Influence of additive silica on the laser melting of the ceramic coatings; Influence of additive silica on the laser melting of the ceramic coatings
	Y. Z. Yang; X. J. Bai; Z. W. Xie; T. C. Kuang; Z. Y. Liu; Y. Z. Zhuang; B. Y. Tong; Y. Liang
	2003 ; 2003
发表期刊	Journal of Materials Science & Technology ; Journal of Materials Science & Technology
ISSN	1005-0302 ; 1005-0302
卷号	19 期号:1 页码:33-36
摘要	The influence of additive silica on the microstructure of plasma sprayed Al2O3 and Al2O3+13 wt pct TiO2 ceramic coatings at laser melting has been investigated in this study. At the laser melting, additive silica in Al2O3 ceramic coating can reduce the stress of cooling shrinkage generated during solidification. Moreover, silica can render finer size of grains of the melting layer and form continuous glassy matter around the grain boundaries so as to reduce further the cooling stresses and to suppress the formation and spreading of cracks. On the other hand, at the laser melting, TiO2 reacts with Al2O3 and transforms into TiAl2O5. The latter new phase has great and anisotropic coefficients of thermal expansion leading to big and asymmetrical stresses and thus to form cracks in the melting layer of Al2O3+13 wt pct TiO2 coating. Due to the fact that the influence of additive silica on the suppression of the formation of cracks is rather limited and cannot counterbalance the negative effect of TiAl2O5, thus the melting layer of Al2O3+13 wt pct TiO2 coating doped with 3 wt pct SiO2 cracks also. Nevertheless, TiO2 can greatly develop the wear resistance of the ceramic coating as sprayed or laser melted.; The influence of additive silica on the microstructure of plasma sprayed Al2O3 and Al2O3+13 wt pct TiO2 ceramic coatings at laser melting has been investigated in this study. At the laser melting, additive silica in Al2O3 ceramic coating can reduce the stress of cooling shrinkage generated during solidification. Moreover, silica can render finer size of grains of the melting layer and form continuous glassy matter around the grain boundaries so as to reduce further the cooling stresses and to suppress the formation and spreading of cracks. On the other hand, at the laser melting, TiO2 reacts with Al2O3 and transforms into TiAl2O5. The latter new phase has great and anisotropic coefficients of thermal expansion leading to big and asymmetrical stresses and thus to form cracks in the melting layer of Al2O3+13 wt pct TiO2 coating. Due to the fact that the influence of additive silica on the suppression of the formation of cracks is rather limited and cannot counterbalance the negative effect of TiAl2O5, thus the melting layer of Al2O3+13 wt pct TiO2 coating doped with 3 wt pct SiO2 cracks also. Nevertheless, TiO2 can greatly develop the wear resistance of the ceramic coating as sprayed or laser melted.
部门归属	guangdong univ technol, fac mat & energy, guangzhou 510643, peoples r china. s china univ technol, dept elect mech engn, guangzhou 510641, peoples r china. chinese acad sci, inst met res, shenyang 110016, peoples r china.;yang, yz (reprint author), guangdong univ technol, fac mat & energy, guangzhou 510643, peoples r china ; guangdong univ technol, fac mat & energy, guangzhou 510643, peoples r china. s china univ technol, dept elect mech engn, guangzhou 510641, peoples r china. chinese acad sci, inst met res, shenyang 110016, peoples r china.;yang, yz (reprint author), guangdong univ technol, fac mat & energy, guangzhou 510643, peoples r china
关键词	Plasma Spraying Plasma Spraying Laser Remelting Laser Remelting Additive Silica Additive Silica Stress Stress Crack Crack
URL	查看原文 ; 查看原文
WOS记录号	WOS:000180691100010 ; WOS:000180691100010
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/36123
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. Z. Yang,X. J. Bai,Z. W. Xie,et al. Influence of additive silica on the laser melting of the ceramic coatings, Influence of additive silica on the laser melting of the ceramic coatings[J]. Journal of Materials Science & Technology, Journal of Materials Science & Technology,2003, 2003,19, 19(1):33-36, 33-36.
APA	Y. Z. Yang.,X. J. Bai.,Z. W. Xie.,T. C. Kuang.,Z. Y. Liu.,...&Y. Liang.(2003).Influence of additive silica on the laser melting of the ceramic coatings.Journal of Materials Science & Technology,19(1),33-36.
MLA	Y. Z. Yang,et al."Influence of additive silica on the laser melting of the ceramic coatings".Journal of Materials Science & Technology 19.1(2003):33-36.