预氧化处理对反应烧结碳化硅微观结构和弯曲强度的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (8): 2889-2895.

预氧化处理对反应烧结碳化硅微观结构和弯曲强度的影响

郝鸿渐¹, 李海燕^1,2, 万德田^1,2,3, 包亦望^1,2,3, 李月明³

1.中国建筑材料科学研究总院有限公司,绿色建筑材料国家重点实验室,北京 100024;
2.中国国检测试控股集团股份有限公司,北京 100024;
3.景德镇陶瓷大学材料科学与工程学院,景德镇 333403

收稿日期:2022-03-29 修回日期:2022-05-10 出版日期:2022-08-15 发布日期:2022-08-30
通讯作者: 万德田,博士,教授。E-mail:dtwan@ctc.ac.cn
作者简介:郝鸿渐(1996—),男,硕士研究生。主要从事陶瓷性能测试的研究。E-mail:haohongjian1996@qq.com
基金资助:
国家自然科学基金重点基金(52032011);新型陶瓷与精细工艺国家重点实验室(KF202007)

Effect of Pre-Oxidation on Microstructure and Flexural Strength of Reaction Boned Silicon Carbide

HAO Hongjian¹, LI Haiyan^1,2, WAN Detian^1,2,3, BAO Yiwang^1,2,3, LI Yueming³

1. State Key Laboratory for Green Building Materials, China Building Materials Academy, Beijing 100024, China;
2. China Testing & Certification International Group Co., Ltd., Beijing 100024, China;
3. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China

Received:2022-03-29 Revised:2022-05-10 Online:2022-08-15 Published:2022-08-30

摘要/Abstract

摘要： 本文提出了一种简单有效的预氧化处理方法,用来强化反应烧结碳化硅(RBSC),研究了800~1 300 ℃预氧化处理对其微观结构和力学性能的影响,探究了含不同尺寸压痕裂纹的材料在氧化前后残余弯曲强度的变化规律。结果表明,随着氧化温度的升高,RBSC的室温强度和Weibull模数均存在先下降后上升,然后再下降的趋势,主要原因是不同温度氧化后的RBSC表面形貌不同。在1 200 ℃下预氧化2 h,RBSC的弯曲强度和Weibull模数都明显变大,强度提升了19.9%,Weibull模数由7.3提升到11.8。然而,800 ℃低温氧化不完全和1 300 ℃高温氧化反应过于强烈均会导致弯曲强度和Weibull模数下降。在最优氧化条件(1 200 ℃氧化2 h)下,含压痕裂纹(载荷20 N)的RBSC试样的残余弯曲强度在氧化后由201.1 MPa提高到324.2 MPa,强化机理是高温氧化生成的SiO₂能够消除材料表面缺陷和微裂纹。

关键词: 反应烧结碳化硅, 预氧化, 裂纹自愈合, 弯曲强度, Weibull模数, 维氏压痕

Abstract: In this paper, a simple and effective pre-oxidation treatment method is proposed to strengthen reaction boned silicon carbide (RBSC). The effects of different temperature oxidation treatments from 800 ℃ to 1 300 ℃ on its microstructure and mechanical properties were investigated. Changes of residual flexural strength of materials with different sizes of pre-cracks before and after oxidation were also investigated. The results show that with the increment of the oxidation temperature, the strength and Weibull modulus of RBSC have a tend to first decrease, then increase, and then decrease again, mainly due to the different surface morphologies after oxidized at different temperatures. The flexural strength and Weibull modulus of RBSC increase significantly after pre-oxidized at 1 200 ℃ for 2 h, the strength increase by 19.9%, and the Weibull modulus increase from 7.3 to 11.8. However, both the incomplete oxidation at low temperature of 800 ℃ and the excessively strong oxidation reaction at high temperature of 1 300 ℃ lead to the decrease of flexural strength and Weibull modulus. Under the optimal pre-oxidation condition at 1 200 ℃ for 2 h, the residual flexural strength of RBSC specimen with indentation cracks (load of 20 N) increase from 201.1 MPa to 324.2 MPa after oxidation. The strengthening mechanism is that the SiO₂ generated by high temperature oxidation eliminates the microcracks and defects of the material on the surface.

Key words: reaction boned silicon carbide, pre-oxidation, crack self-healing, flexural strength, Weibull modulus, Vickers indentation

中图分类号:

TQ174

郝鸿渐, 李海燕, 万德田, 包亦望, 李月明. 预氧化处理对反应烧结碳化硅微观结构和弯曲强度的影响[J]. 硅酸盐通报, 2022, 41(8): 2889-2895.

HAO Hongjian, LI Haiyan, WAN Detian, BAO Yiwang, LI Yueming. Effect of Pre-Oxidation on Microstructure and Flexural Strength of Reaction Boned Silicon Carbide[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2889-2895.

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