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Influence of SiC Whiskers on Microstructure of APS YSZ Coating
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Affiliation:

1.School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130;2.Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin 300300;3.Engine Overhaul Department, AMECO, Beijing 100621

Clc Number:

TG174.45

Fund Project:

National Natural Science Foundation of China (51501222)

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    Abstract:

    Agglomerated YSZ (Y2O3 partially stabilized ZrO2) particles with 0wt%, 1wt%, 2wt% and 3wt% of whiskers (named as 0#,1#, 2# and 3# powders, respectively) were prepared by spray granulation technology. Four groups of coatings (0#, 1#, 2# and 3# coating) were prepared by APS (atmospheric plasma spraying). The dispersion and quantitative characterization of SiC whiskers, morphology of agglomerated particles and microstructure of the coatings were studied by SEM (scanning electron microscopy) and light-optical microscopy, and the forming process of the coating containing SiC whiskers was analyzed. The result shows that as the stirring time increases to 5 h, the whiskers show better dispersion and the corresponding area percentage of whiskers of the specimen is 11.03%. The particles containing whiskers are mainly “droplet shaped” and “spindle shaped”, and the percentage of these two streamlined particles in 1#, 2# and 3# powders is 16.5%, 22.7% and 39.3%, respectively. Due to the obstructing effect of non-horizontal state whiskers on impacting and spreading process of unmelted raw powders, the porosity increases as the whiskers content increases. The porosity of 0# coating is 3.89%, while the porosity of 1#, 2# and 3# coatings is 3.15, 4.17 and 7.52 times larger than that of 0# coating, respectively.

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[Cheng Taotao, Wang Zhiping, Dai Shijie, Ding Kunying, Ma Xiang. Influence of SiC Whiskers on Microstructure of APS YSZ Coating[J]. Rare Metal Materials and Engineering,2021,50(8):2700~2707.]
DOI:XX. XXXX/j. issn.1002-185X.2021.08.006

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History
  • Received:June 16,2020
  • Revised:June 29,2020
  • Adopted:July 21,2020
  • Online: September 07,2021
  • Published: August 31,2021