Microstructure and Mechanical Properties of the Reaction-Sintered Silicon Carbide Ceramics Modified by Carbon Fiber

doi:10.7652/xjtuxb201704010

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Microstructure and Mechanical Properties of the Reaction-Sintered Silicon Carbide Ceramics Modified by Carbon Fiber

更新时间：2025-07-09

- Microstructure and Mechanical Properties of the Reaction-Sintered Silicon Carbide Ceramics Modified by Carbon Fiber
- Vol. 51, Issue 4, Pages: 67-70+108(2017)
- 作者机构：
  
  西安交通大学金属材料强度国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201704010
  CLC： TB321
- Online First：10 April 2017，
  
  Published：2017
- 稿件说明：
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Microstructure and Mechanical Properties of the Reaction-Sintered Silicon Carbide Ceramics Modified by Carbon Fiber[J]. 2017, 51(4): 67-70+108.
DOI：

Microstructure and Mechanical Properties of the Reaction-Sintered Silicon Carbide Ceramics Modified by Carbon Fiber[J]. 2017, 51(4): 67-70+108. DOI： 10.7652/xjtuxb201704010.

摘要

针对传统反应烧结碳化硅陶瓷中由于残硅量过多而引起力学性能下降的问题

提出了一种有效降低组织中残硅量的方法。该方法使用不同体积分数的短碳纤维作为碳源

添加碳化硼促进液硅渗入

有效降低了组织中的残硅量

制备出一种力学性能优异的复合陶瓷。对碳纤维的反应机理、烧结体组织演变和力学性能变化进行了分析

实验结果表明:碳纤维作为碳源主要是以溶解-沉淀的形式与硅反应

最终组织中形成了纤维状残硅; 当生成的次生碳化硅堵塞渗硅通道后

硅与碳纤维以扩散形式反应; 在碳纤维自搭建的贯穿网状结构和碳化硼的双重作用下

当添加体积分数为30%的碳纤维时

抗弯强度最高为(482±12)MPa; 当添加体积分数为40%的碳纤维时

残硅体积分数为1.6%

残硅相尺寸仅为纳米级

断裂韧性最高为(5.82±0.37)MPa?m

1/2

。

Abstract

An effective method to reduce residual silicon content in reaction-sintered silicon carbide(RSSC)ceramics is presented to solve the problem that traditional RSSC ceramics have low mechanical properties for its high residual silicon content. The method helps to reduce the residual silicon content and to get composite ceramics with excellent mechanical properties by using short carbon fiber as carbon source and boron carbide to promote liquid silicon infiltration. The reaction mechanism of the carbon fiber

the microstructure evolution of the sintered body and the change of the mechanical properties are analyzed. Experimental results show that the carbon fiber reacts with silicon using dissolution-precipitation method

to form fiber-like silicon in the sintering body

then the resulting SiC blocks the capillary and the carbon fiber reacts with the silicon by diffusion. Under the dual fuction of the self-supporting interpenetrating network structure of the carbon fiber and the boron carbide

the flexural strength reaches a peak value of(482±12)MPa when 30% volume fraction of carbon fiber is added; while the residual silicon content decreases to 1.6% volume fraction

the silicon size is nanoscale and the fracture toughness reaches a peak value of(5.82±0.37)MPa?m

1/2

when 40% of carbon fiber is added.

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references

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