TaC对SiC涂层高温耐烧蚀性能的影响

罗骁; 陈晔松; 康盼; 方家; 杨鑫; 黄启忠

doi:10.19976/j.cnki.43-1448/TF.2022090

粉末冶金材料科学与工程 >

2023 , Vol. 28 >Issue 2: 120 - 128

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2022090

工艺技术

TaC对SiC涂层高温耐烧蚀性能的影响

罗骁 ,
陈晔松 ,
康盼 ,
方家 ,
杨鑫 ,
黄启忠

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中南大学粉末冶金国家重点实验室,长沙 430081

收稿日期: 2022-12-16

修回日期: 2023-02-16

网络出版日期: 2023-05-04

基金资助

湖南省自然科学基金面上项目(2021JJ30852)

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Effect of TaC on high temperature ablative resistance of SiC coatings

LUO Xiao ,
CHEN Yesong ,
KANG Pan ,
FANG Jia ,
YANG Xin ,
HUANG Qizhong

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State Key Laboratory of Powder Metallurgy, Central South University, Changsha 430081, China

Received date: 2022-12-16

Revised date: 2023-02-16

Online published: 2023-05-04

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摘要

以Si粉和Ta₂O₅粉为原料,采用包埋反应工艺在C/C复合材料表面制备SiC涂层和SiC-TaC复合涂层,通过X射线衍射、扫描电镜和高温等离子火焰(2 300 ℃左右)烧蚀实验,研究TaC对SiC涂层微观结构、高温耐烧蚀性能的影响和影响机理。结果表明：TaC可有效提升SiC涂层的高温耐烧蚀性能。经30 s等离子火焰烧蚀后,SiC涂层的质量烧蚀率和线烧蚀率分别为(0.189 2±0.080 0) mg/s和(1.386 7±0.120 0) μm/s,而SiC-TaC复合涂层的质量烧蚀率和线烧蚀率分别为(0.062 7±0.050 0) mg/s和(0.893 9±0.070 0) μm/s,比SiC涂层的质量烧蚀率和线烧蚀率分别降低66.86%和35.54%。SiC-TaC复合涂层的高温耐烧蚀性能提高主要与涂层的高温稳定性增强及烧蚀过程中熔融Ta₂O₅相的自愈合作用有关。

关键词： 包埋法; SiC涂层; SiC-TaC涂层; 耐烧蚀性能; C/C复合材料

本文引用格式

罗骁 , 陈晔松 , 康盼 , 方家 , 杨鑫 , 黄启忠 . TaC对SiC涂层高温耐烧蚀性能的影响[J]. 粉末冶金材料科学与工程, 2023 , 28(2) : 120 -128 . DOI: 10.19976/j.cnki.43-1448/TF.2022090

Abstract

SiC coating and SiC-TaC composite coating were prepared on the surface of C/C composites by embedding reaction process using Si and Ta₂O₅ powders as raw materials. The effects of TaC on the microstructure and high temperature ablation resistance of SiC coating were studied by X-ray diffraction, scanning electron microscopy and high temperature plasma flame (about 2 300 ℃) ablation experiments. The results show that addition of TaC can effectively improve the ablation resistance of SiC coating. After ablation under plasma flame for 30 s, the mass and linear ablation rates of SiC coating are (0.189 2±0.080 0) mg/s and (1.386 7±0.120 0) μm/s, respectively. With addition of TaC phase, the mass and linear ablation rates of SiC-TaC coating are (0.062 7± 0.050 0) mg/s and (0.893 9±0.070 0) μm/s, respectively, the mass and linear ablation rates of SiC-TaC coating are decreased by 66.86% and 35.54%, respectively. The improvement of high-temperature ablation resistance of SiC-TaC composite coating is mainly related to the enhancement of high-temperature stability of the coating and the self-healing cooperation of molten Ta₂O₅ phase during ablation.

Key words： pack cementation; SiC coating; SiC-TaC coating; ablation resistance; carbon/carbon composites

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