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由B4C和MAX阶段通过反应性烧结获得的UHTC陶
Dawid Kozień1, Adrian Graboś2, Katarzyna Pasiut3
1Faculty of Materials Science and Ceramics, Department of Ceramics and Refractory Materials, AGH University of Krakow, 30 Mickiewicz Av, 30-059, Krakow, Poland. kozien@agh.edu.pl.
Scientific reports
|September 29, 2025
概括
将Ti3SiC2等MAX相添加到碳化物复合材料中,可显著降低烧结温度并提高抗破裂性,对先进的超高温陶应用具有前景.
科学领域:
- 材料科学 材料科学 材料科学
- 陶工程 陶工程
- 复合材料 复合材料 复合材料
背景情况:
- 超高温陶 (UHTC) 对极端环境至关重要.
- 碳化物 (B4C) 是一种具有理想性质但高烧结温度的超高度碳化物.
- 马克斯相是一种具有独特性质的三元碳化物/化物.
研究的目的:
- 研究三种MAX相 (Ti3SiC2,Ti2AlC,Cr2AlC) 对UHTC复合材料密度和性能的影响.
- 评估MAX阶段在降低B4C基复合材料烧结温度方面的潜力.
- 分析由此产生的复合材料的相位组成和机械性能.
主要方法:
- 合成密的UHTC复合材料,其中包含不同的MAX相.
- 通过B4C和MAX相之间的化学反应分析相位形成.
- 机械性能的表征,包括断裂阻力 (KIC),维克尔硬度和模.
主要成果:
- 添加MAX阶段导致二次化物阶段形成.
- 与纯B4C相比,烧结温度降低了多达800°C.
- 骨折阻力 (KIC) 增加了33-100%.
- 添加Ti3SiC2保留了B4C的机械性能,而Ti2AlC和Cr2AlC降低了硬度和Young的模量.
结论:
- MAX阶段有效地降低了基于B4C的UHTC的烧结温度.
- 含有Ti3SiC2的复合材料由于其增强的断裂性,因此在UHTC应用中具有很好的潜力.
- 该研究强调了MAX阶段在定制先进陶复合材料的性能方面的作用.
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