材料科学
维氏硬度试验
粒度
抗弯强度
陶瓷
石墨
弹性模量
晶粒生长
碳化物
烧结
堆积密度
复合材料
分析化学(期刊)
矿物学
微观结构
化学
土壤科学
土壤水分
色谱法
环境科学
作者
Duo Yu,Buhao Zhang,Jie Yin,Yichen Wang,Xuejian Liu,Michael J. Reece,Zhengren Huang
摘要
Abstract A pressureless two‐step sintering method was used to densify high‐entropy carbide (Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 )C, with high density and good mechanical performance. The material was heated up to 2200°C and subsequently soaked at 1900°C for 2–8 h with the incorporation of 2–4 wt.% phenolic resin. With increasing resin content, the large‐sized pores disappeared, and the average grain size decreased. However, with increased holding time from 2 to 8 h, the average grain and pore size did not change significantly, the density increased up to 96.2%, and evident grain growth of graphite was observed. The mechanical properties of (Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 )C with 4 wt.% phenolic resin addition and 8 h soaking at 1900°C were measured as follows: flexural strength 361±28 MPa, Vickers hardness 16.0±0.3 GPa, and elastic modulus 426±2 GPa.
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