碳纤维增强Al<sub>2</sub>O<sub>3</sub>-20% Ni金属陶瓷复合材料的制备及组织性能

王敏; 贾建刚; 郭铁明; 王海龙

doi:10.13801/j.cnki.fhclxb.20170310.001

碳纤维增强Al₂O₃-20% Ni金属陶瓷复合材料的制备及组织性能

1.
兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室, 兰州 730050;
2.
兰州理工大学材料科学与工程学院, 兰州 730050

基金项目: 国家自然科学基金（51461029）；兰州理工大学红柳青年教师培养计划（201203）

详细信息

通讯作者:
贾建刚,博士,副教授,硕士生导师,研究方向为金属硅化物结构材料E-mail:lzhjiajiangang@163.com

中图分类号: TB333
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出版历程
- 收稿日期: 2016-12-14
- 修回日期: 2017-01-20
- 刊出日期: 2017-12-14

Fabrication and properties of carbon fiber reinforced Al₂O₃-20% Ni metal-ceramic composites

1.
State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China;
2.
School of Materials Science and Engineering, Lanzhou University and Technology, Lanzhou 730050, China

摘要

摘要: 采用溶胶-凝胶+热压烧结法制备了碳纤维（CF）体积分数分别为0%、5%、10%、15%的CF/Al₂O₃-20% Ni金属陶瓷复合材料，采用XRD、SEM和EDS能谱分析了CF/Al₂O₃-20% Ni复合材料的物相组成、组织形貌及成分分布，并研究了CF含量对CF/Al₂O₃-20% Ni复合材料硬度、抗弯强度和EDS断裂韧性的影响，通过SEM分析了CF/Al₂O₃-20% Ni复合材料的断口形貌并探讨了断裂机制。结果表明：采用溶胶-凝胶法可获得CF分散良好、Ni颗粒分布均匀的CF/Al₂O₃-20% Ni复合材料，并且可在CF表面包覆一层α-Al₂O₃保护膜，从而防止CF在高温烧结过程中的烧损。随着CF体积分数的增加，CF/Al₂O₃-20% Ni复合材料的硬度降低，抗弯强度和断裂韧性都先升高后下降，当CF体积分数为10%时，抗弯强度和断裂韧性均达到峰值，相对不含CF试样分别提高了79%和134%，CF的加入使CF/Al₂O₃-20% Ni复合材料的强度和韧性得以改善。用此方法制备的CF/Al₂O₃-20% Ni复合材料的增韧机制为碳纤维的拔出、桥接及脱粘。
- 碳纤维 /
- Al₂O₃-Ni /
- 金属陶瓷 /
- 抗弯强度 /
- 断裂韧性
Abstract: The CF/Al₂O₃-20% Ni metal-ceramic composites with 0%, 5%, 10% and 15% volume fraction of carbon fiber (CF) were prepared by sol-gel method and hot-pressing sintering. The phase composition,surface and fracture morphology were analyzed by XRD, SEM and EDS. The effect of CF content on CF/Al₂O₃-20% Ni hardness, bending strength, fracture toughness was studied. The fracture morphology of composites was analyzed by SEM and its mechanism was discussed. The results show that CF/Al₂O₃-20% Ni composites with well dispersed CF and evenly distributed Ni particles was obtained, and can prevent the loss CF in the sintering process at high temperature by the formation of α-Al₂O₃ protective film layer on the CF surface. With the increase of volume fraction of CF, The hardness of the CF/Al₂O₃-20% Ni composites reduce, and its bending strength and fracture toughness first increase and then decrease. When the CF volume fraction is 10%, the bending strength and fracture toughness reach the maximum values, which increase by 79% and 134%, respectively, compared with the composites without CF. The addition of CF improves the strength and toughness of the CF/Al₂O₃-20% Ni composites. The toughening mechanism of CF/Al₂O₃-20% Ni is CF pull out, bridge and disbonding.
- carbon fiber /
- Al₂O₃-Ni /
- metal ceramics /
- bending strength /
- fracture toughness

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