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Study of Microstructure and Properties of Plasma Sprayed Nanostructured Zirconia Thermal Barrier Coatings before and after Laser Galzing

Author: HaoYunFei
Tutor: ChenHui
School: Southwest Jiaotong University
Course: Materials Processing Engineering
Keywords: Plasma spraying Nano zirconia thermal barrier coatings Laser remelting Organizational performance
CLC: TG174.442
Type: Master's thesis
Year: 2009
Downloads: 255
Quote: 1
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Abstract


With the development of the modern aerospace industry, conventional thermal barrier coatings can no longer meet the increasing performance requirements of high-temperature hot-end components. Research workers began to nanotechnology, laser remelted surface treatment technology and plasma spraying technique combined expect to get better performance thermal barrier coating. In this paper, the atmospheric plasma spraying nano-zirconia (ZrO 2 -8% Y 2 O 3 ) reunion powder preparation of nano-zirconia thermal barrier coating layer continuous CO 2 laser its remelting processing. As a comparison to conventional thermal barrier coating, a systematic study of the organizational structure of the nano-zirconia thermal barrier coatings and laser remelting coating phase composition and performance characteristics (thermal shock resistance, abrasion wear properties, high temperature stability performance). Nano zirconia thermal barrier coatings organizational structure and its performance test results analysis: the nano zirconia thermal barrier coatings exhibit unique nano - micron composite structure, mainly composed of columnar crystals and not molten or partially molten nanoparticles. Unbalanced tetragonal phase nano-zirconia thermal barrier coatings, the coating does not contain monoclinic phase. And compared to conventional thermal barrier coatings, nano zirconia thermal barrier coatings have better thermal shock resistance. This is mainly due to its relatively dense structure, as well as micro-cracks, the stress sustained release of the nanocrystals, small aperture pores. The nano zirconia thermal barrier coatings high temperature stability performance test results show that the coating grain size increases with increasing service temperature and time of service, but remained nanostructures; coating phase composition does not change with the change of the service environment . Therefore, the nano zirconia thermal barrier coatings have a very good high temperature stability. Nanostructured coating of high temperature friction and wear properties superior to conventional thermal barrier coatings. The laser remelting test results show that with the changes in the parameters of the laser remelting, remelting coating easily produce \However, by optimizing the parameters of laser remelting can get good quality, defect-free laser remelting coating. With the gradual increase of the laser than energy, coatings organizational structure of by single columnar crystals gradually becomes columnar grain and equiaxed composite structure. X-ray diffraction of the laser remelting coating results confirm the remelting coating tissue analysis results. The laser remelting surface treatment can significantly improve thermal barrier coatings thermal impact properties of the surface and equiaxed grains closed to external corrosion medium section columnar crystals and surface mesh microcracks heat stress release mechanism has a composite structure remelting coating show the main reason of the optimal thermal shock resistance. Can be drawn through the above test analysis, nanotechnology and laser remelted surface treatment technology combined with plasma spray technique is to improve the performance of thermal barrier coatings very promising process for preparation of thermal barrier coatings.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology > Metal complex layer of protection > Spraying method
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