| SiC纳米线增强反应烧结碳化硅陶瓷的性能研究 |
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| 引用本文： | 曾凡,陈建军,姜敏,方宁象.SiC纳米线增强反应烧结碳化硅陶瓷的性能研究[J].硅酸盐通报,2018,37(2):586-590. |
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| 作者姓名： | 曾凡 陈建军 姜敏 方宁象 |
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| 作者单位： | 浙江理工大学机械与自动控制学院,杭州,310018;浙江理工大学材料与纺织、丝绸学院,杭州,310018;浙江立泰复合材料股份有限公司,湖州,313000 |
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| 基金项目： | 国家自然科学基金(51572243) |
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| 摘 要： | 以单晶SiC纳米线作为增强体,碳化硅-碳为陶瓷基体,在1550℃下,采用反应烧结制备碳化硅基陶瓷复合材料(SiCnf/SiC).结合X射线衍射、万能试验机和扫描电镜等检测和分析,研究SiC纳米线对复合材料的微结构和力学性能的影响.研究表明:与未加入SiC纳米线的反应烧结碳化硅陶瓷相比,添加SiC纳米线的复合陶瓷的抗弯强度和断裂韧性都得到显著的提高,抗弯强度提高了52％,达到320 MPa(SiC纳米线含量为12wt％),断裂韧性提高了40.6％,达到4.5 MPa· m1/2(SiC纳米线含量为15wt％);反应后的SiC纳米线仍然可以保持原有的竹节状结构,且随着SiC纳米线的加入,复合陶瓷的断口可以观察到SiC纳米线拔出现象.但由于SiC纳米线“架桥”的现象,添加过量的纳米线会降低复合陶瓷的密度和限制复合陶瓷力学性能的提高.同时还讨论了SiCnf/SiC的增强机理.
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| 关 键 词： | 碳化硅复合陶瓷 SiC纳米线 反应烧结 |
Properties of Reaction Bonded Silicon Carbide Ceramics Reinforced by SiC Nanowires |
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| ZENG Fan,CHEN Jian-jun,JIANG Min,FANG Ning-xiang.Properties of Reaction Bonded Silicon Carbide Ceramics Reinforced by SiC Nanowires[J].Bulletin of the Chinese Ceramic Society,2018,37(2):586-590. |
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| Authors: | ZENG Fan CHEN Jian-jun JIANG Min FANG Ning-xiang |
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| Abstract: | The composite of reaction bonded silicon carbide reinforced by SiC nanowires was prepared.At 1550 ℃,the effect of SiC nanowires on the structure and mechanical properties of the materials was studied by X ray diffraction,universal testing machine,density tester and scanning electron microscope (SEM).The results show that compared with the materials without silicon carbide nanowires,the flexural strength and fracture toughness of the composite ceramics with SiC nanowires are improved remarkably,the flexural strength is up to 320 MPa improved by 52％ (12wt％ SiC nanowires),fracture toughness is up to 4.5 MPa · m1/2 increased by 40.6％ (15wt％ SiC nanowire);the SiC nanowires can still maintain the original bamboo-like structure under high sintering temperature;with the addition of SiC nanowires,SiC nanowires pull-outs occure on the fracture surface.Excessive nanowires reduce the density of materials and limited the mechanical properties of the material when the nanowires fraction increases due to the bridging effect of nanowires.The enhancement mechanism of SiCnf/SiC is also discussed. |
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| Keywords: | silicon carbide composite ceramic SiC nanowire reaction bonded |
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