Mechanical Characterization of ZrB2-SiC Composites with Varying SiC Particle Sizes
Mechanical Characterization of ZrB2-SiC Composites with Varying SiC Particle Sizes
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DOI：
10.1111/j.1551-2916.2011.04885.x
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发表时间：
2011-12-01
影响因子：
3.9
通讯作者：
Fahrenholtz, William G.
中科院分区：
文献类型：
--
作者：
Watts, Jeremy;Hilmas, Greg;Fahrenholtz, William G.
弯曲强度、弹性模量和硬度用于表征含有不同 SiC 颗粒尺寸的 ZrB2-SiC 复合材料的机械性能。通过热压生产由 70 vol% ZrB2 和 30 vol% α-SiC 组成的致密 ZrB2-SiC 复合材料。该系列复合材料的最大SiC颗粒尺寸范围为4.4至18μm。机械性能与最大 SiC 颗粒尺寸成比例，而不是与 ZrB2 晶粒尺寸成比例。随着SiC颗粒最大尺寸从4.4μm时的1150MPa增加到18μm时的245MPa，弯曲强度下降，并且在接近11.5μm时强度突然下降。对于含有小于11.5μm的SiC颗粒的组合物，弹性模量保持恒定在大约530GPa，但随着SiC颗粒尺寸的增大而表现出降低。对于 SiC 颗粒尺寸的陶瓷，维氏硬度和努氏硬度分别为 21.4 和 17.2 GPa
Flexural strength, elastic modulus, and hardness were used to characterize the mechanical properties of ZrB2-SiC composites that contained varying SiC particle sizes. Dense ZrB2-SiC composites consisting of 70 vol% ZrB2 and 30 vol% alpha-SiC were produced via hot pressing. This series of composites had maximum SiC particle sizes that ranged from 4.4 to 18 mu m. The mechanical properties scaled with the maximum SiC particle size, not with ZrB2 grain size. Flexural strength decreased as the maximum size of SiC particles increased from 1150 MPa at 4.4 mu m to 245 MPa at 18 mu m with an abrupt decrease in strength at similar to 11.5 mu m. Elastic modulus remained constant at similar to 530 GPa for compositions containing SiC particles smaller than 11.5 mu m, but exhibited a decrease with larger SiC particle sizes. Vickers and Knoop hardness were 21.4 and 17.2 GPa, respectively, for ceramics with SiC particle sizes