Improved mechanical and tribological properties of (TiZrHfNbTa)C with the addition of silicon carbide whiskers

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics Pub Date : 2024-10-05 DOI:10.1016/j.oceram.2024.100693

Lenka Ďaková , Alexandra Kovalčíková , Monika Hrubovčáková , Jana Andrejovská , František Kromka , Ján Dusza

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Abstract

Dense (Ti_0.2Zr_0.2Hf_0.2Nb_0.2Ta_0.2)C with up to 10 wt % SiC whisker were prepared by spark plasma sintering. The influence of SiC_w on the microstructure development, mechanical and tribological properties has been investigated. Nanohardness of HEC and SiC_w phases varied between 38 GPa and 40 GPa, and indentation modulus of elasticity was ∼605 GPa. The hardness of the composites increased from 22 GPa to 27 GPa and indentation fracture resistance from 3.55 MPa m^1/2 to 4.59 MPa m^1/2 with increasing SiC_w content. The main toughening mechanisms were crack deflection, crack branching, and crack bridging. The system HEC +5 wt% of SiC_w was found to possess the highest bending strength of 623 ± 25 MPa. The composites exhibited similar coefficients of frictions with around 0.3 and wear rates approximately 1.50 × 10⁻⁶ mm³/N⋅m at 5 N and 2.66 × 10⁻⁶ mm³/N⋅m at 25 N with positive influence of SiC phase on the wear mechanisms.

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添加碳化硅晶须后 (TiZrHfNbTa)C 的机械和摩擦学特性得到改善

通过火花等离子烧结法制备了含有高达 10 wt % SiC 晶须的致密（Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2）C。研究了 SiCw 对微结构发展、力学和摩擦学性能的影响。HEC 和 SiCw 相的纳米硬度介于 38 GPa 和 40 GPa 之间，压痕弹性模量为 605 GPa。随着 SiCw 含量的增加，复合材料的硬度从 22 GPa 增加到 27 GPa，抗压痕断裂性能从 3.55 MPa m1/2 增加到 4.59 MPa m1/2。主要的增韧机制是裂纹偏转、裂纹分支和裂纹桥接。研究发现，HEC +5 wt% SiCw 体系的弯曲强度最高，达到 623 ± 25 MPa。复合材料表现出相似的摩擦系数，约为 0.3，磨损率在 5 N 时约为 1.50 × 10-6 mm3/N-m，25 N 时约为 2.66 × 10-6 mm3/N-m，SiC 相对磨损机制有积极影响。

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来源期刊

Open Ceramics Materials Science-Materials Chemistry

CiteScore

4.20

自引率

0.00%

发文量

102

审稿时长

67 days