Protection Mechanism Study of Enamel-Based Composite Coatings Under the Simulated Combusting Gas Shock

doi:10.11900/0412.1961.2018.00230

IMR OpenIR

	Protection Mechanism Study of Enamel-Based Composite Coatings Under the Simulated Combusting Gas Shock
	Guo Cean 1,2,3; Chen Minghui 4; Liao Yimin 4; Su Bei 1; Xie Dongbai 5; Zhu Shenglong 2; Wang Fuhui 4
通讯作者	Chen Minghui(mhchen@mail.neu.edu.cn)
	2018-12-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	54 期号:12 页码:1825-1832
摘要	High-temperature-resistant enamel coatings have been reported to be applied in non-critical hot end components of aero-engine and gas turbine recently. Although the enamel with a series of excellent properties can be as high-temperature-resistant coating material under appropriate condition, its lower soft point and inherent brittleness limit their use in broader application under severe service condition. Enamel-based composite coatings (an enamel matrix with the addition of ceramic particles and/or metal platelets) can remarkably increase the properties of the enamel coating and their protection mechanism under dynamic thermal shock needs further investigation. In this work, two kinds of enamel-based composite coatings, 70%enamel+25%Al2O3 and 70%enamel + 20%Al2O3 + 10%NiCrAlY (mass fraction, %) abbreviated to E25A and E20A10M respectively, were designed and fired on K38G superalloy substrate, and their protection mechanism was comparatively studied at 900. under the simulated combusting gas shock. The thermal shock fire was produced by the mixture gas of C3H8+O-2 and its ejecting pressure on the coating surface was 0.4 MPa. After the temperature has been stable at 900 degrees C, samples were hold for 15 s and then cooling down in air for 120 s, constituting a thermal shock cycle. Results indicated that, after 150 cyc of thermal shock, both the coatings bond well with the alloy substrate, thus shows high resistance to spallation along interface. For the E25A coating, its microstructure had no obvious change after thermal shock and the surface is still intact. The addition of secondary phase Al2O3 increases the stability of enamel at high temperature. With regard to the E20A10M coating, holes and cracks form consecutively, and peeling off occurs at surface after thermal shock. Interfacial reaction between the NiCrAlY particles and enamel following Cr-(NiCrAlY) + ZnO(enamel)-> CrO(interface) + Zn up arrow results in the formation of enamel swelling, which then, under the synergistic effect of combusting gas shear stress and interface thermal stress, leads to the peeling off of enamel and metal inclusions at surface.
关键词	enamel-based composite coating high-temperature corrosion Al2O3 NiCrAlY thermal shock
资助者	National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; National Science Foundation of Liaoning Province of China
DOI	10.11900/0412.1961.2018.00230
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51471177] ; Fundamental Research Funds for the Central Universities[No.N160205001] ; National Science Foundation of Liaoning Province of China[201602643]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000454455600013
出版者	SCIENCE PRESS
引用统计	被引频次：2[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/321006/131072
专题	中国科学院金属研究所
通讯作者	Chen Minghui
作者单位	1.Shenyang Ligong Univ, Equipment Engn Sch, Shenyang 110159, Liaoning, Peoples R China 2.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 3.Chongqing Jianshe Ind Grp LLC, Chongqing 400054, Peoples R China 4.Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Liaoning, Peoples R China 5.Xinjiang Police Coll, Urumqi 830011, Peoples R China
推荐引用方式 GB/T 7714	Guo Cean,Chen Minghui,Liao Yimin,et al. Protection Mechanism Study of Enamel-Based Composite Coatings Under the Simulated Combusting Gas Shock[J]. ACTA METALLURGICA SINICA,2018,54(12):1825-1832.
APA	Guo Cean.,Chen Minghui.,Liao Yimin.,Su Bei.,Xie Dongbai.,...&Wang Fuhui.(2018).Protection Mechanism Study of Enamel-Based Composite Coatings Under the Simulated Combusting Gas Shock.ACTA METALLURGICA SINICA,54(12),1825-1832.
MLA	Guo Cean,et al."Protection Mechanism Study of Enamel-Based Composite Coatings Under the Simulated Combusting Gas Shock".ACTA METALLURGICA SINICA 54.12(2018):1825-1832.