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Improved oxidation resistance of CoNiCrAlTaHfY/Co coating on C/C composites by vapor phase surface alloying

Published online by Cambridge University Press:  23 December 2019

Qi Guo ,
Tianxu Meng ,
Wenqiang Ding ,
Wen Xi ,
Naiming Lin ,
Shengwang Yu  and
Xiaoping Liu
Qi Guo
Affiliation:
Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China; and Taiyuan Heavy Industry Co., Ltd., Smelting & Casting Subco, Taiyuan 030024, China
Tianxu Meng
Affiliation:
Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Wenqiang Ding
Affiliation:
Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Wen Xi
Affiliation:
Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Naiming Lin
Affiliation:
Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Shengwang Yu
Affiliation:
Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Xiaoping Liu*
Affiliation:
Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A CoNiCrAlTaHfY/Co composite coating was prepared on the etched C/C composites by using duplex vapor phase surface alloying treatments, i.e., Co alloying and Co–Ni–Cr–Al–Ta–Hf–Y alloying. Microstructures and oxidation behavior of the coated C/C composites were analyzed by scanning electron microscopy, energy-dispersive spectroscopy, and X-ray diffraction. The result showed that the CoNiCrAlTaHfY/Co composite coating, 25 μm in thickness, was compact and composed of CrCoTa, AlCo2Ta, AlxCry, AlxNiy, and Co. The coating adhesion can be enhanced by microwave plasma chemical vapor deposition etching of matrix surface and adding a Co intermediate layer between the CoNiCrAlTaHfY top layer and C/C composites substrate. The honeycomb structure after etching was helpful to alloying element absorb and diffuse into substrate surface, and the composite coating continuation was improved by the Co buffer layer. After exposing in air for 180 min at 1000 °C, the bulk C/C composites volatilized while the loss rate of coated C/C composites was 0.82%, showing an improved oxidation resistance. Mixed oxides mainly containing Al2O3 and Cr2O3 were formed in the composite coating surface and protected the C/C composites from oxidation in air.

Keywords

coatingreactive ion etchingoxidation
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 5: Focus Issue: The Science and Technology of Vapor Phase Processing and Modification of Surfaces , 16 March 2020 , pp. 500 - 507
Copyright
Copyright © Materials Research Society 2019

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