Self-Healing and Thermal Stability of LaMgAl11O19-Ti3AlC2 Composites for High-Temperature Abradable Applications

Author:

Huang Jingqi1ORCID,Chen Wenbo1,Lü Kaiyue1,Xu Mingyi1,Deng Longhui1,Jiang Jianing1,Dong Shujuan1,Chen Meizhu1,Cao Xueqiang1

Affiliation:

1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China

Abstract

Defects such as interconnected pores and cracks can improve the abradability of ceramic-based abradable sealing coatings (ASCs) but may reduce the lifetime. Self-healing can potentially close cracks and transform interconnected pores into isolated ones through filling and sintering effects. Ti3AlC2 (TAC) was incorporated into LaMgAl11O19 (LMA) as both the self-healing agent and sintering aid, and plasma-sprayed LMA-based composite coatings were annealed at 1200 °C to assess their self-healing capabilities and then subjected to oxidation in air and corrosion in steam at 1300 °C to study their long-term stability. Results indicated that increasing TAC content significantly enhances self-healing effectiveness, evidenced by the closure of cracks and the isolation of pores. Oxidation and corrosion at 1300 °C led to significant grain growth and the formation of equiaxed grains with an aspect ratio of approximately 3, which may impair the toughening mechanism. Meanwhile, due to the preferential volatilization of Al in a steam environment, LTA decomposed into α-La2/3TiO3 and La4Ti3O12 phases, and the accelerated mass transfer also resulted in grain coarsening. Interestingly, the L20T composite coating with a porosity of 32.17 ± 0.94% and a hardness of 74.88 ± 1.55 HR15Y showed great potential for abradable applications due to its stable phase composition and uniform pore distribution.

Funder

National Natural Science Foundation of China

Major Program (JD) of Hubei Province

Key Research and Development Program of Hubei Province

Publisher

MDPI AG

Reference59 articles.

1. Sporer, D., Wilson, S., Giovannetti, I., Refke, A., and Giannozzi, M. (2007, January 11–13). On The Potential of Metal and Ceramic Based Abradables in Turbine Seal Applications. Proceedings of the Thirty-Sixth Turbomachinery Symposium, College Station, Texas, USA.

2. Development and Investigation on New Composite and Ceramic Coatings as Possible Abradable Seals;Bardi;J. Therm. Spray Technol.,2008

3. A Perspective on Thermally Sprayed Thermal Barrier Coatings: Current Status and Trends;Bakan;J. Therm. Spray Technol.,2022

4. YSZ-Polyester Abradable Coatings Manufactured by APS;Aussavy;J. Therm. Spray Technol.,2016

5. Sporer, D.R., Taeck, U., Dorfman, M.R., Nicoll, A.R., Giannozzi, M., and Giovannetti, I. (2006, January 8–11). Novel Ceramic Abradable Coatings with Enhanced Performance. Proceedings of the ASME Turbo Expo 2006: Power for Land, Sea, and Air, Barcelona, Spain.

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3