在高温下氧化行为Ti-合SiOC陶的Ti-合SiOC陶
Xiumei Wu1, Xiaojuan Gong2, Yunping Li3
1National Key Laboratory of Science and Technology on High-Strength Structural Materials, Central South University, Changsha 410083, China.
Materials (Basel, Switzerland)
|January 28, 2026
概括
与 (Ti) 合氧化碳 (SiOC) 陶增强了耐高温氧化性能. 0.05的Ti-doping比改善了保护性氧化物层,减少了裂并改善了自我愈合.
科学领域:
- 材料科学 材料科学 材料科学
- 陶工程 陶工程
- 高温材料 高温材料
背景情况:
- 氧化碳 (SiOC) 陶在高温应用中由于热应力引起的裂而过早失效.
- 提高SiOC的氧化阻力对于苛刻的环境至关重要.
研究的目的:
- 研究 (Ti) 兴奋剂对SiOC陶在1500°C的氧化行为的影响.
- 为了确定最佳的Ti兴奋剂度,以提高氧化抵抗和结构完整性.
主要方法:
- 合成Ti-doped SiOC (SiTiOC) 陶,具有不同的Ti:Si摩尔比率.
- 在1500°C的空气中对SiTiOC进行32小时的氧化试验.
- 结果的氧化物层组成和微观结构的全面分析.
主要成果:
- 具有0.05的Ti:Si摩尔比率的SiTiOC表现出优越的氧化电阻.
- 保护性氧化物层包括SiO2和TiO2,在粒边界有TiO2和TiSiO4,抑制了裂的传播.
- 较高的Ti兴奋剂 (0.2比率) 导致毛孔,裂,并加剧了Ti扩散和TiC氧化.
结论:
- 兴奋剂通过形成强大的复合氧化物层,有效地提高了SiOC陶的氧化阻力.
- 最佳的Ti:Si摩尔比为0.05,产生密集的,自我修复的氧化物层,氧气透度低.
- 过度的Ti兴奋剂可以损害氧化物层的完整性,否定好处.
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