还原氧化石墨烯增强碳化硼陶瓷的制备与表征

人工晶体学报 ›› 2021, Vol. 50 ›› Issue (3): 572-577.

还原氧化石墨烯增强碳化硼陶瓷的制备与表征

许森¹, 方宁象², 张善伟¹, 张虹², 林文松¹

1.上海工程技术大学材料工程学院,上海 201620;
2.浙江立泰复合材料股份有限公司,湖州 313200

收稿日期:2020-10-30 出版日期:2021-03-15 发布日期:2021-04-15
通信作者: 林文松,博士,教授。E-mail:wslin@sues.edu.cn
作者简介:许森(1997—),男,河南省人,硕士研究生。E-mail:786614301@qq.com
基金资助:
浙江省科技计划(2017C54006)

Preparation and Characterization of Boron Carbide Ceramics Enhanced by Reduced GO

XU Sen¹, FANG Ningxiang², ZHANG Shanwei¹, ZHANG Hong², LIN Wensong¹

1. College of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;
2. Zhejiang Light-Tough Composite Materials Co., Ltd., Huzhou 313200, China

Received:2020-10-30 Online:2021-03-15 Published:2021-04-15

摘要/Abstract

摘要： 采用球磨混合、雾化造粒方法制备了氧化石墨烯/碳化硼(GO/B₄C)复合粉体,并将其在2 100 ℃和30 MPa压力下真空热压,得到了还原氧化石墨烯/碳化硼(rGO/B₄C)复合材料,使用扫描电镜(SEM)、热重分析(TG)和X射线衍射(XRD)等表征方法和三点弯曲法以及排水法等测试方法对复合材料进行表面相分析和力学性能表征,研究了GO添加量对rGO/B₄C复合材料的弯曲强度和断裂韧性等力学性能的影响。结果表明,将稳定分散的GO/水悬浮液逐步加入到球磨中的B₄C浆料中,可以得到混合均匀的GO/B₄C复合粉体。在粉末浆料中加入质量分数为1.5%的GO, rGO/B₄C复合材料的弯曲强度和断裂韧性分别为535 MPa和5.2 MPa·m^1/2,分别比B₄C陶瓷提高了72.6%和136%,有利于碳化硼陶瓷在军事防护领域的应用。并从石墨烯拔出、裂纹偏转和桥接等方面解释了rGO/B₄C复合材料的增韧机理。

关键词: 碳化硼, 氧化石墨烯, 陶瓷烧结, 热压, 断裂韧性, 增韧机理

Abstract: GO/Boron carbide (GO/B₄C) composite powders were prepared by ball-milling and atomizing granulation. Reduced GO/Boron carbide (rGO/B₄C) composites were obtained by vacuum hot pressing at 2 100 ℃ under the pressure of 30 MPa. The surface phase and mechanical properties of the composites were analyzed by SEM, TG and XRD, three-point bending method and drainage method. The effect of GO dosage on the bending strength and fracture toughness of rGO/B₄C composites was studied. The results show that the uniformly mixed GO/B₄C composite powder can be obtained by gradually adding the stable and dispersed GO/water suspension to the B₄C slurry during the ball milling process. The bending strength and fracture toughness of rGO/B₄C composites, in which the GO content is 1.5%, are 535 MPa and 5.2 MPa · m^1/2, respectively, 72.6% and 136% higher than those of B₄C ceramics. It is beneficial to the application of boron carbide ceramics in military protection field. The toughening mechanism of rGO/B₄C composites was explained from the aspects of graphene pulling, crack deflection and bridging. This will allow future researchers to further investigate the toughening effect of GO and it is also conducive to its large-scale industrial production.

Key words: boron carbide, graphene oxide, ceramics sintering, hot pressing, fracture toughness, toughening mechanism

中图分类号:

TQ174

许森, 方宁象, 张善伟, 张虹, 林文松. 还原氧化石墨烯增强碳化硼陶瓷的制备与表征[J]. 人工晶体学报, 2021, 50(3): 572-577.

XU Sen, FANG Ningxiang, ZHANG Shanwei, ZHANG Hong, LIN Wensong. Preparation and Characterization of Boron Carbide Ceramics Enhanced by Reduced GO[J]. Journal of Synthetic Crystals, 2021, 50(3): 572-577.

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