霍达,李文生,冯力,胡春霞,胡伟.喷涂工艺对MoSi2-Al2O3涂层组织与性能的影响[J].表面技术,2018,47(4):267-273.
HUO Da,LI Wen-sheng,FENG Li,HU Chun-xia,HU Wei.Effects of Spraying Process on Microstructure and Properties of MoSi2-Al2O3 Coating[J].Surface Technology,2018,47(4):267-273
喷涂工艺对MoSi2-Al2O3涂层组织与性能的影响
Effects of Spraying Process on Microstructure and Properties of MoSi2-Al2O3 Coating
投稿时间:2017-10-29  修订日期:2018-04-20
DOI:10.16490/j.cnki.issn.1001-3660.2018.04.039
中文关键词:  MoSi2-Al2O3涂层  团聚烧结粉末  火焰喷涂  等离子喷涂  结合强度  高温抗氧化性能
英文关键词:MoSi2-Al2O3 coating  agglomerated and sintered powder  flame spraying  plasma spraying  bonding strength  high temperature oxidation resistance
基金项目:国家国际科技合作项目(2015DFR51090);国家自然科学基金(51674130);甘肃省自然科学基金(1508RJZA006)
作者单位
霍达 兰州理工大学,兰州 730050 
李文生 兰州理工大学,兰州 730050 
冯力 兰州理工大学,兰州 730050 
胡春霞 兰州理工大学,兰州 730050 
胡伟 兰州理工大学,兰州 730050 
AuthorInstitution
HUO Da Lanzhou University of Technology, Lanzhou 730050, China 
LI Wen-sheng Lanzhou University of Technology, Lanzhou 730050, China 
FENG Li Lanzhou University of Technology, Lanzhou 730050, China 
HU Chun-xia Lanzhou University of Technology, Lanzhou 730050, China 
HU Wei Lanzhou University of Technology, Lanzhou 730050, China 
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中文摘要:
      目的 在不锈钢表面制备一种可服役于高温富氧环境中的抗高温氧化防护涂层。方法 采用MoSi2-Al2O3团聚烧结粉末为喷涂原料,分别利用等离子喷涂和火焰喷涂两种工艺在310S不锈钢表面制备MoSi2-Al2O3抗高温氧化涂层。采用SEM、EDS、XRD和粗糙度测量仪分析涂层的组织结构,使用拉伸法检测涂层的结合强度,采用高温氧化实验表征涂层的抗高温氧化性能。结果 等离子喷涂涂层中的粉末熔化程度较火焰喷涂涂层更高,涂层呈现致密的堆叠结构且Si、O元素分布更为均匀。等离子喷涂涂层的结合强度为24.25 MPa,较火焰喷涂涂层提高了约68%。经1200 ℃高温氧化试验后,火焰喷涂涂层出现粉化,氧化剧烈并发生剥落,而等离子喷涂涂层未出现粉化现象,涂层结构完好。在高温氧化过程中,由于等离子喷涂涂层组织致密,可有效避免涂层粉化,均匀分布的Si元素在涂层氧化过程中更易产生SiO2并对涂层裂纹进行有效填补,阻碍了氧原子向涂层内部扩散,因此涂层抗高温氧化性优异。结论 采用等离子喷涂技术能够在310S不锈钢表面制备出组织结构、结合强度及高温性能更好的MoSi2-Al2O3涂层。
英文摘要:
      The work aims to prepare a protective coating which is resistant to high temperature oxidation and can be used in high temperature oxygen-enriched environment. With MoSi2-Al2O3 agglomerated and sintered powder as raw material for spraying, high temperature oxidation resistant MoSi2-Al2O3 coatings was prepared on the surface of 310S stainless steel by adopting process of flame spraying and plasma spraying. SEM, EDS, XRD and surface roughness tester were used to analyze structure of the coatings, bonding strength of the coatings was tested in tensile method, and high temperature oxidation resistance of the coatings was tested by performing high temperature oxidation experiment. Plasma spraying coating was superior to flame spraying coating in terms of powder melting degree, the coating exhibited more compact stacked structure, and distribution of Si, O element was more uniform. Bonding strength of plasma sprayed coating was 24.25 MPa, nearly 68% higher than that of flame sprayed coating. After high temperature oxidation test at 1200 ℃, the flame sprayed coating was subject to pulverization, severe oxidation and spalling while the plasma sprayed coating was not subject to pulverization (with intact coating structure). Coating pulverization could be prevented effectively in the process of high temperature oxidization due to compact structure of the plasma sprayed coating, uniformly distributed Si element was more likely to generate SiO2 and repair coating cracks in the process of coating oxidization, which prevented oxygen atoms from diffusing toward coating interior. Moreover, the coating exhibited excellent high temperature oxidization resistance. Plasma spraying technology can be used to prepare MoSi2-Al2O3 coatings exhibiting better microstructure, bonding strength and high temperature oxidation on the surface of 310S stainless steel.
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