首页|Improving repair performance for damaged C/C composites via heat-treatment temperature optimization and surface pretreatment

Improving repair performance for damaged C/C composites via heat-treatment temperature optimization and surface pretreatment

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A Ni-based solder BNi-5 was adopted as the repair agent to repair the prefabricated defects on the car-bon/carbon(C/C)composites.The effects of different heat-treatment(HT)temperatures and pre-oxidation on the chemical composition,microstructure,and mechanical behavior of the repaired C/C composites were investigated,and the repair mechanism was studied by finite element analysis methods.The repair agent and C/C composites were tightly bonded through mechanical interlocking and chemical reactions,and the flexural properties of the damaged C/C composites were significantly improved after repair.The products at the interface formed a gradient distribution structure of the thermal expansion coefficient when the HT temperature was 1300 ℃,which is beneficial to relieve the residual thermal stress at the interface.Meanwhile,the porosity of the surface of the C/C composites was higher after pre-oxidation,which led to more diffusion channels for the repair agent and enhanced the interface bonding ability.The flexural strength was the highest with a recovery rate of 85.2％when the C/C composites were pre-oxidized at 600 ℃ and the HT temperature was 1300 ℃.This work provides a strategy for the engineering application of the damage repair of C/C composites.

Carbon/carbon compositesDamage repairBNi-5Flexural strength

Weiyan Wang、Qiangang Fu、Dou Hu、Tianyu Liu

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Shaanxi Province Key Laboratory of Fiber Reinforced Light Composite Materials,State Key Laboratory of Solidification Process,Northwestern Polytechnical University,Xi'an 710072,China

National Key R&D Program of ChinaNational Key R&D Program of ChinaScience Center for Gas Turbine ProjectNational Natural Science Foundation of China

2021YFA07158002021YFA0715803P2021-A-Ⅳ-003-00152125203

2024

10.1016/j.jmst.2023.09.053

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.183(16)