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Protection Mechanism Study of Enamel-Based Composite Coatings Under the Simulated Combusting Gas Shock
Guo Cean1,2,3; Chen Minghui4; Liao Yimin4; Su Bei1; Xie Dongbai5; Zhu Shenglong2; Wang Fuhui4
Corresponding AuthorChen Minghui(mhchen@mail.neu.edu.cn)
2018-12-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume54Issue:12Pages:1825-1832
AbstractHigh-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.
Keywordenamel-based composite coating high-temperature corrosion Al2O3 NiCrAlY thermal shock
Funding OrganizationNational Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; National Science Foundation of Liaoning Province of China
DOI10.11900/0412.1961.2018.00230
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000454455600013
PublisherSCIENCE PRESS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/131072
Collection中国科学院金属研究所
Corresponding AuthorChen Minghui
Affiliation1.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
Recommended Citation
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.
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