无机材料学报2024，Vol.39Issue(3)：267-273,7.DOI:10.15541/jim20230259
含有石墨烯阵列的SiC基陶瓷材料的制备与力学性能
SiC-based Ceramic Materials Incorporating GNPs Array:Preparation and Mechanical Characterization
摘要
Abstract
Silicon carbide ceramics are important engineering materials,but their application is limited by the inherent brittleness.Two-dimensional graphene,with its excellent properties,can be used as a second phase to improve the performance of silicon carbide ceramics.However,due to poor dispersion of graphene in the ceramic matrix,it is a challenge to fully exploit the modifying effect of graphene in composite materials.To address these challenges,SiC-based ceramic materials incorporating graphene nanosheets(GNPs)were synthesized using ceramic organic precursor polycarbosilane and industrial expandable graphite as starting materials.The precursor intercalation technique was employed to fabricate SiC/GNPs ceramic composites with GNPs volume fraction of 1%,3%,and 5%.The GNPs were uniformly arranged in an array-like parallel fashion in the SiC ceramic matrix,showing excellent orientation.With the GNPs content increasing,the spacing between GNPs within the array decreased,indicating tunable microstructural topology.The addition of GNPs greatly enhanced the fracture toughness of SiC ceramics.When the GNPs content was 3%,the relative density of the samples reached 98.5%,the bending strength reached 445 MPa,and the fracture toughness(KIC value)peaked at 5.67 MPa·m1/2,surpassing pure SiC ceramics by 40%,which was primarily attributed to crack deflection and bridging induced by the GNPs.However,further increase in GNPs content led to a decrease in fracture toughness to 4.37 MPa·m1/2.These SiC-based ceramic composites with a graphene array have potential application in design and development of novel"structure-function integration"SiC-based ceramic devices.关键词
碳化硅/石墨烯/微观组织/断裂韧性/陶瓷增韧Key words
silicon carbide/graphene/microstructure/fracture toughness/ceramic toughening分类
化学化工引用本文复制引用
孙川,何鹏飞,胡振峰,王荣,邢悦,张志彬,李竞龙,万春磊,梁秀兵..含有石墨烯阵列的SiC基陶瓷材料的制备与力学性能[J].无机材料学报,2024,39(3):267-273,7.基金项目
国家自然科学基金(51975582) （51975582）
北京市科技计划课题(Z211100002421003)National Natural Science Foundation of China(51975582) （Z211100002421003）
Beijing Municipal Science and Technology Project(Z211100002421003) （Z211100002421003）
