Huayu Zhao
Chinese Academy of Sciences
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Publication
Featured researches published by Huayu Zhao.
Journal of Thermal Spray Technology | 2015
Dachuan Li; Huayu Zhao; Xinghua Zhong; Chenguang Liu; Liang Wang; Kai Yang; Shunyan Tao
In this work, yttria-stabilized zirconia splats deposited onto different bond coatings were characterized. The influence of both substrate topography and temperature on splat morphologies was investigated. The substrate surface was described using a method characterized by multi-level roughness. On non-heated substrate, the peak-valley structure in scale of micrometer contributed to the formation of crater-like holes on splats. The amount of such holes was reduced with the increase of substrate temperature. It was also observed that on micro-smooth surface, island-like fragments in the center of splat would warp and their edges could be detached from the underlying substrate, especially when the substrate was heated. The obtained results reveal that the influence of substrate pre-heating on the splat formation is realized via thinning the air film near substrate surface.
Journal of Applied Physics | 2015
X. Wang; X. Peng; Huayu Zhao; Zh. Guo; W. Li; F. Wang
Oxidation has been explained as one possibility for unacceptable and irreversible coercivity loss of 2:17 type SmCo-based magnets at high temperatures over 550 °C, but the question for how oxidation affects coercivity in the magnet has not been fundamentally answered. In this work, oxidation and its induced degradation of the magnetic phases of a Sm(CobalFe0.22Cu0.08Zr0.02)7.5 magnet in air at 600 °C have been investigated by using transmission electron microscopy and correlated with the demagnetization curves measured. It shows that the coercivity loss, which is significantly increased with oxidation time, is small and independent of time in the magnet unaffected by oxidation. The reason lies in that the 2:17 cell and 1:5 cell boundary, although they have been completely disintegrated in the oxidized part by external oxidation of Co, Fe, and Cu and internal oxidation of Sm, remains in the unoxidized part except that 1:5 boundary close to the oxidized part is decreased in thickness and Cu content.
Journal of Thermal Spray Technology | 2018
Jiasheng Yang; Huayu Zhao; Xinghua Zhong; Jinxing Ni; Yin Zhuang; Liang Wang; Shunyan Tao
Plasma spray-physical vapor deposition (PS-PVD) is an advanced technique to fabricate quasi-columnar structured thermal barrier coatings (TBCs) with excellent thermal cyclic lifetime. In this study, PS-PVD TBCs were investigated via burner rig test. The residual stresses in both of the topcoat layer and the thermally grown oxide (TGO) scale were measured non-destructively using Raman spectroscopy and Cr3+ photoluminescence piezo-spectroscopy, respectively. Evolution of the microstructures and distribution of residual stresses in such kind structured TBCs before and after thermal cycling test were investigated. The accumulated tensile stress in the as-sprayed ceramic topcoat changed to compressive state after 100 cycles and then gradually increased. In addition, the mapping compressive stresses in the TGO measured through the ceramic topcoat surface decreased rapidly and then essentially maintained at a relatively stable state with further testing. Moreover, the pre-heating of the bondcoat could significantly affect the stress distribution in the TGO, in contrast, no obviously influence on the stresses in the YSZ topcoat.
Journal of The European Ceramic Society | 2008
Ming Lei; Huayu Zhao; H. Yang; B. Song; W.H. Tang
Journal of The European Ceramic Society | 2010
Jianhua Yu; Huayu Zhao; Shunyan Tao; Xiaming Zhou; Chuanxian Ding
Surface & Coatings Technology | 2014
Yuexing Zhao; Dachuan Li; Xinghua Zhong; Huayu Zhao; Liang Wang; Fang Shao; Chenguang Liu; Shunyan Tao
Surface & Coatings Technology | 2011
Kai Yang; Xiaming Zhou; Huayu Zhao; Shunyan Tao
Surface & Coatings Technology | 2015
Fang Shao; Kai Yang; Huayu Zhao; Chenguang Liu; Liang Wang; Shunyan Tao
Journal of Alloys and Compounds | 2014
Xinghua Zhong; Huayu Zhao; Xiaming Zhou; Chenguang Liu; Liang Wang; Fang Shao; Kai Yang; Shunyan Tao; Chuanxian Ding
Journal of Alloys and Compounds | 2008
Ming Lei; Huayu Zhao; H. Yang; B. Song; L.Z. Cao; P.G. Li; W.H. Tang