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含有石墨烯阵列的SiC基陶瓷材料的制备与力学性能OA北大核心CSTPCD

SiC-based Ceramic Materials Incorporating GNPs Array:Preparation and Mechanical Characterization

中文摘要英文摘要

碳化硅陶瓷是一种重要工程材料,但具有一定的脆性,这限制了其进一步应用.二维石墨烯具有诸多优良特性,可以作为第二相对碳化硅陶瓷材料进行性能改善.然而石墨烯在陶瓷基体中存在分散性较差等问题,难以发挥其对陶瓷基体的改性作用.为解决以上问题,本工作以陶瓷有机前驱体聚碳硅烷和工业可膨胀石墨为原料,通过前驱体-纳米插层技术制备了少层石墨烯纳米片(GNPs)的体积分数分别为1%、3%和5%的SiC/GNPs陶瓷基复合材料.GNPs在SiC陶瓷基体中呈阵列态平行排布,显示出极高的取向性;随着GNPs含量增加,阵列中GNPs的间距依次递减,表现出一定的微观组织拓扑可调节性;加入GNPs显著提高了SiC陶瓷的断裂韧性,当GNPs含量为 3%时,样品的相对密度为 98.5%,抗弯强度为445 MPa,断裂韧性达到最高值 5.67 MPa·m1/2,相比纯SiC陶瓷提高了 40%,由GNPs引发的裂纹偏转与桥连是主要的增韧机制.而进一步提高GNPs含量,断裂韧性下降至 4.37 MPa·m1/2.这种含有石墨烯阵列的复合材料可以用于新型"结构-功能一体化"SiC基陶瓷器件的设计与开发.

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.

孙川;何鹏飞;胡振峰;王荣;邢悦;张志彬;李竞龙;万春磊;梁秀兵

军事科学院 国防科技创新研究院,北京 100071清华大学 新型陶瓷与精细工艺国家重点实验室,北京 100084

化学工程

碳化硅石墨烯微观组织断裂韧性陶瓷增韧

silicon carbidegraphenemicrostructurefracture toughnessceramic toughening

《无机材料学报》 2024 (003)

耐高温高熵合金增材成形及高温使役性能研究

267-273 / 7

国家自然科学基金(51975582);北京市科技计划课题(Z211100002421003)National Natural Science Foundation of China(51975582);Beijing Municipal Science and Technology Project(Z211100002421003)

10.15541/jim20230259

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