SiC涂层/三维碳纤维编织体的氧化动力学和机理研究

无机材料学报

SiC涂层/三维碳纤维编织体的氧化动力学和机理研究

高朋召; 王红洁; 金志浩

西安交通大学材料强度国家重点实验室, 西安 710049

收稿日期:2004-02-23 修回日期:2004-05-18 出版日期:2005-03-20 网络出版日期:2005-03-20

Oxidation Kinetics and Mechanism of SiC Coating/3-dimensional Carbon Fiber Braid

GAO Peng-Zhao; WANG Hong-Jie; JIN Zhi-Hao

State Key Laboratory for Mechanical Behavior of Materials; Xi an Jiaotong University; Xi an 710049; China

Received:2004-02-23 Revised:2004-05-18 Published:2005-03-20 Online:2005-03-20

摘要/Abstract

摘要： 采用原位反应法在三维碳纤维编织体(简称:RB)的纤维表面制得SiC涂层,通过 XRD、SEM、等温氧化失重和非等温热重分析等测试手段研究了制备方法对SiC涂层均匀性的影响,并对SiC涂层／碳纤维编织体(简称:CB)材料在等温和非等温条件下,氧化反应的动力学和反应机理进行了研究.结果表明:SiC涂层均匀、完整地涂覆于编织体内外各纤维表面;材料等温氧化反应的机理为第一阶段反应控制,第二阶段扩散和反应共同控制;材料的非等温氧化过程呈现自催化特征,氧化机理为随机成核,氧化动力学参数为:lgA=9.615min^-1; E_a=201.73kJ·mol^-1.

关键词: 原位反应法, 三维碳纤维编织体, 非等温热重分析, 氧化动力学和机理

Abstract: The in situ reaction method was used to prepare SiC coating on 3-D carbon fiber braid (RB). XRD, SEM, isothermal oxidation-weight loss and non-isothermal TG were used to
study the oxidation process and oxidation reaction mechanism of SiC coating/3-D carbon fiber braid (CB). The results showed that coating was
coated symmetrically and combined well with every fiber of braid. The oxidation process of CB in isothermal condition was reaction-controlled
in the first step, gas diffusion and reaction-controlled in the second step. The oxidation process of CB in non-isothermal condition exhibited a
self-catalytic characteristic, the oxidation mechanism was random nucleation, the kinetic parameters were: lgA=10.299min^-1; E_a=156.29kJ·mol^-1.

Key words: in situ reaction method, 3-D carbon fiber braid, non-isothermal TG, oxidation kinetics and mechanism

中图分类号:

TQ343

高朋召,王红洁,金志浩. SiC涂层/三维碳纤维编织体的氧化动力学和机理研究[J]. 无机材料学报.

GAO Peng-Zhao,WANG Hong-Jie,JIN Zhi-Hao. Oxidation Kinetics and Mechanism of SiC Coating/3-dimensional Carbon Fiber Braid[J]. Journal of Inorganic Materials.

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