Si3N4 coatings as a novel alternative to SiC for oxidation protection of C/C composites

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-09-01 DOI:10.1016/j.ceramint.2025.06.205

Song Zeng , Wenhao Du , Fanhao Zeng , Yafang Gao

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引用次数: 0

Abstract

Current research predominantly uses SiC as inner layers for C/C composites, this study introduces a novel Si₃N₄ coating for reduce thermal stress between the coating and C/C substrate and enhance oxidation resistance. The effects of silicon content, silicon practical size, and sintering temperature on the coating’s microstructure were investigated. The results showed that the dense Si₃N₄ coating can be obtained with the ratio of fine Si powder: α-Si₃N₄: Al₃O₂: Y₂O₃ = 50 : 40: 6 : 4 at a sintering temperature of 1673 K and holding time of 2–3 h and its bonding strength between substrate and coating was up to 6.88 ± 0.03 MPa. Oxidation tests at 1673 K for 70 h revealed a weight loss of 25.80 %, demonstrating superior performance over SiC coatings. Thermal stress analysis showed that Si₃N₄ coatings reduced tensile stress by 44 % compared to SiC coatings, indicating better stress mismatch. The protective SiO₂ layer formed during oxidation effectively delayed oxygen penetration, offering a promising choice for high-temperature applications of C/C composites.

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Si3N4涂层作为SiC的一种新型替代材料用于C/C复合材料的氧化防护

目前的研究主要采用SiC作为C/C复合材料的内层，本研究介绍了一种新型的Si3N4涂层，以减少涂层与C/C基体之间的热应力，提高抗氧化性。研究了硅含量、硅实用尺寸和烧结温度对涂层显微组织的影响。结果表明，在烧结温度为1673 K，保温时间为2 ~ 3 h时，细硅粉：α-Si3N4: Al3O2: Y2O3 = 50:40: 6:4的条件下，可以获得致密的Si3N4涂层，涂层与基体的结合强度可达6.88±0.03 MPa。在1673 K条件下氧化70 h，结果表明该涂层的重量减轻了25.80%，性能优于SiC涂层。热应力分析表明，与SiC涂层相比，Si3N4涂层的拉伸应力降低了44%，表明应力不匹配更好。氧化过程中形成的SiO2保护层有效地延缓了氧气的渗透，为C/C复合材料的高温应用提供了一个有希望的选择。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.