SiC含量对机械合金化-热压制备B4C-SiC复合陶瓷的影响

doi:10.3724/SP.J.1077.2014.13521

无机材料学报 ›› 2014, Vol. 29 ›› Issue (7): 695-700.DOI: 10.3724/SP.J.1077.2014.13521 CSTR: 32189.14.SP.J.1077.2014.13521

SiC含量对机械合金化-热压制备B₄C-SiC复合陶瓷的影响

张志晓¹, 杜贤武¹, 邢伟宏², 王为民¹, 张金咏¹, 傅正义¹

(武汉理工大学 1. 材料复合新技术国家重点实验室; 2. 材料科学与工程学院武汉 430070)

收稿日期:2013-10-10 修回日期:2013-11-12 出版日期:2014-07-20 网络出版日期:2014-06-20
作者简介:张志晓(1988–), 男, 博士研究生. E-mail: zhixiao351@whut.edu.cn
基金资助:
中日韩A3前瞻计划项目(51161140399);国家自然科学基金(U12301013)

Effect of SiC Content on B₄C-SiC Composites Fabricated by Mechanical Alloying-hot Pressing

ZHANG Zhi-Xiao¹, DU Xian-Wu¹, XING Wei-Hong², WANG Wei-Min¹, ZHANG Jin-Yong¹, FU Zheng-Yi¹

(1. Key Laboratory of Advanced Technology for Materials Synthesis and Processing, 2. school of Materials science and Engineering, Wuhan University of Technology, Wuhan 430070, China)

Received:2013-10-10 Revised:2013-11-12 Published:2014-07-20 Online:2014-06-20
About author:ZHANG Zhi-Xiao. E-mail: zhixiao351@whut.edu.cn
Supported by:
Asia 3 Foresight program(51161140399);National Natural Science Foundation of China (U12301013)

摘要/Abstract

摘要：

以B₄C、SiC粗粉为原料, 采用机械合金化辅助热压烧结工艺, 在不添加任何助烧剂的情况下于1950℃制备出致密的B₄C-SiC复合陶瓷。通过对烧结样品进行相对密度、维氏硬度、抗弯强度和断裂韧性测试, 研究SiC含量对复合陶瓷力学性能的影响; 结合XRD、SEM和TEM对样品进行组分和微观结构分析, 研究其微观结构与力学性能之间的关系。结果表明: 复合陶瓷的相对密度和断裂韧性随SiC含量的增加而增大, 当SiC含量为50wt%时获得最大值为96.1%和4.6 MPa•m^1/2; 复合陶瓷的硬度和抗弯强度随SiC含量的增加呈先增大后减小的趋势, 在SiC含量为20wt%时获得最大值25.5 GPa和480 MPa。SiC相均匀分布在B₄C基体中使得复合陶瓷具有较高的强度; B₄C与SiC之间好的界面相容性以及SiC的高断裂韧性是该B₄C基复合陶瓷韧性得到显著提高的原因。

关键词: 复合陶瓷, 热压, 机械合金化, 力学性能, 微观结构

Abstract:

Dense B₄C-SiC composite ceramics were fabricated through mechanical alloying using coarser B₄C and SiC powders as starting powders, and subsequent hot pressing sintering at 1950℃ without any sintering aid. The influences of the content of SiC on mechanical properties of the composite ceramics were studied through determining relative density of composite ceramics, Vickers hardness, flexure strength and fracture toughness. Combined with the microstructure and component analysis technologies of XRD, SEM and TEM, the relationship between microstructure and mechanical properties of the composite ceramics was investigated. The results indicate that the relative density and fracture toughness of the composite ceramics are improved with increase of SiC content, and reach the maximum value at 96.1% and 4.6 MPa•m^1/2,respectively, with SiC content of 50wt%. However, with the increase of SiC, the Vickers hardness and flexure strength are enhanced firstly and then decreased. The maximum values are 25.5 GPa and 480 MPa, respectively, with SiC content of 20wt%. Homogeneous dispersion of SiC phase in B₄C matrix is one of the reasons why the composite ceramics possess higher flexure strength. Fracture toughness of the composite ceramics is significantly higher than that of monomeric B₄C. The main reasons are attributed to powerful interfacial bonding between B₄C and SiC as well as the higher fracture toughness of SiC.

Key words: composite ceramics, hot pressing, mechanical alloying, mechanical properties, microstructure

中图分类号:

TQ174

张志晓, 杜贤武, 邢伟宏, 王为民, 张金咏, 傅正义. SiC含量对机械合金化-热压制备B₄C-SiC复合陶瓷的影响[J]. 无机材料学报, 2014, 29(7): 695-700.

ZHANG Zhi-Xiao, DU Xian-Wu, XING Wei-Hong, WANG Wei-Min, ZHANG Jin-Yong, FU Zheng-Yi. Effect of SiC Content on B₄C-SiC Composites Fabricated by Mechanical Alloying-hot Pressing[J]. Journal of Inorganic Materials, 2014, 29(7): 695-700.

图/表 8

图1 原料粉体的SEM照片和粒度分布图

Fig. 1 SEM images and particle size distributions (insets) of raw materials

图2 球磨后不同SiC含量粉体的粒径分布曲线

Fig. 2 Particle size distributions of milled powders with different contents of SiC

图3 球磨前后粉体的XRD图谱及粉磨后粉体的SEM照片

Fig. 3 XRD patterns and SEM images of composite powders before and after milling

图4 不同SiC含量烧结样品的断面SEM照片

Fig. 4 Fractural surface SEM images of the sintered samples with different contents of SiC

图5 不同SiC含量样品的相对密度和维氏硬度

Fig. 5 Relative density and Vickers hardness of the sintered samples with different contents of SiC

图6 不同SiC含量样品的抗弯强度和断裂韧性

Fig. 6 Flexure strength and fracture toughness of sintered samples with different contents of SiC

图7 带有微裂纹的抛光表面的SEM照片

Fig. 7 SEM image of polished surface with crack

图8 B4C-20wt%SiC复合陶瓷的TEM照片

Fig. 8 TEM image of B4C-20wt%SiC composite

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SiC含量对机械合金化-热压制备B₄C-SiC复合陶瓷的影响

Effect of SiC Content on B₄C-SiC Composites Fabricated by Mechanical Alloying-hot Pressing

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