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Ultra-high temperature ceramic (UHTC) coatings are used to protect the hot-end components of hypervelocity aerocrafts from thermal ablation. This study provides a new approach to fabricate UHTC coatings with high speed laser cladding (HSLC) technology, and places more emphasis on investigating the formation mechanism, phase compositions, and mechanical properties of HSLC-UHTC coatings. Results show that a well-bonded interface between the coating and the tantalum alloy substrate can be formed. The coating is mainly composed of (Zr,Ta)C ceramic solid solution phase with a content of higher than 90% by volume and Ta(W) metal solid solution phase. At a relatively high powder feeding rate, the ZrC ceramic phase appears in the coating while a dense ZrC UHTC top layer with a thickness of up to ~50 μm is successfully fabricated. As for the mechanical properties of the HSLC coatings, the fracture toughness of the coating decreases with the increase of powder feeding rate. The increase of carbide solid solution phase can significantly improve the high temperature microhardness (552.7±1.8 HV0.5@1000 ℃). The innovative design of HSLC ZrC-based coatings on refractory alloys accomplishes continuous transitions on microstructure and properties from the substrate to the UHTC top layer, which is a very promising candidate scheme for thermal protection coating.


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High speed laser cladding as a new approach to prepare ultra-high temperature ceramic coatings

Show Author's information Qiyao Deng1Pengfei He2( )Chuan Sun2Yang Li1,3( )Yue Xing2Yujie Wang4Jinglong Li2Xiubing Liang2( )Xin Wang2Yujie Zhou3Yujun Cai1,3
National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die & Mould, Tianjin University of Technology and Education, Tianjin 300222, China
Defense Innovation Institute, Academy of Military Science, Beijing 100071, China
School of mechanical engineering, Tianjin University of Technology and Education, Tianjin 300222, China
Scientific and Technological Innovation Center, Beijing 100012, China

Abstract

Ultra-high temperature ceramic (UHTC) coatings are used to protect the hot-end components of hypervelocity aerocrafts from thermal ablation. This study provides a new approach to fabricate UHTC coatings with high speed laser cladding (HSLC) technology, and places more emphasis on investigating the formation mechanism, phase compositions, and mechanical properties of HSLC-UHTC coatings. Results show that a well-bonded interface between the coating and the tantalum alloy substrate can be formed. The coating is mainly composed of (Zr,Ta)C ceramic solid solution phase with a content of higher than 90% by volume and Ta(W) metal solid solution phase. At a relatively high powder feeding rate, the ZrC ceramic phase appears in the coating while a dense ZrC UHTC top layer with a thickness of up to ~50 μm is successfully fabricated. As for the mechanical properties of the HSLC coatings, the fracture toughness of the coating decreases with the increase of powder feeding rate. The increase of carbide solid solution phase can significantly improve the high temperature microhardness (552.7±1.8 HV0.5@1000 ℃). The innovative design of HSLC ZrC-based coatings on refractory alloys accomplishes continuous transitions on microstructure and properties from the substrate to the UHTC top layer, which is a very promising candidate scheme for thermal protection coating.

Keywords: microstructure, mechanical properties, ultra-high temperature ceramic (UHTC), thermal protection coating, high speed laser cladding (HSLC)

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Received: 30 August 2023
Revised: 29 October 2023
Accepted: 14 November 2023
Published: 08 March 2024
Issue date: February 2024

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© The Author(s) 2024.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 52105233 and 52275366) and the Tianjin Science and Technology Plan Project (No. 22JCYBJC01590).

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This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).

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