Scholarlink

<p>High-purity Ti<sub>2</sub>AlC MAX-phase was synthesized using stoichiometric elemental powder mixture of Ti/Al/C in 2:1:1 molar ratio through pressure-less synthesis technique at 1470&#xa0;°C temperature under flowing Argon atmosphere. The product showed ~ 50% theoretical density, which results in easy pulverization into powders. The formation temperature of Ti<sub>2</sub>AlC MAX-phase was identified through high-temperature differential scanning calorimetry (HTDSC) by heating the starting powder mixture up to 1550&#xa0;°C. X-ray diffraction and scanning electron microscopic analysis confirmed the formation of phase-pure Ti<sub>2</sub>AlC MAX-phase after pressure-less synthesis at 1470&#xa0;°C for 1&#xa0;h. The fractured surface of the product revealed nano-layered structure, a typical characteristic to MAX-phases. The oxidation behaviour of the porous Ti<sub>2</sub>AlC MAX-phase product was studied at 1200&#xa0;°C for 1, 5 and 10&#xa0;h in static air. Oxidized specimens revealed progressive increase in mass gain due to a multi-layer oxide scale formation on the surface. A porous TiO<sub>2</sub> layer was found to form at the outer surface followed by relatively dense Al<sub>2</sub>O<sub>3</sub> layer towards the inner Ti<sub>2</sub>AlC MAX-phase. The total thickness of oxide layer was found to increase from ~ 300 to ~ 1300&#xa0;µm with the progress of time from 1 to 10&#xa0;h, while oxidation at 1200&#xa0;°C.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Ti2AlC MAX-phase: Pressure-less synthesis and its oxidation

  • 期刊论文

  • 发表日期：

    2026年4月24日

查看全文
  • Rakesh Kumar,
  • Mohammad Yunus,
  • Bikas C. Maji

摘要

High-purity Ti2AlC MAX-phase was synthesized using stoichiometric elemental powder mixture of Ti/Al/C in 2:1:1 molar ratio through pressure-less synthesis technique at 1470 °C temperature under flowing Argon atmosphere. The product showed ~ 50% theoretical density, which results in easy pulverization into powders. The formation temperature of Ti2AlC MAX-phase was identified through high-temperature differential scanning calorimetry (HTDSC) by heating the starting powder mixture up to 1550 °C. X-ray diffraction and scanning electron microscopic analysis confirmed the formation of phase-pure Ti2AlC MAX-phase after pressure-less synthesis at 1470 °C for 1 h. The fractured surface of the product revealed nano-layered structure, a typical characteristic to MAX-phases. The oxidation behaviour of the porous Ti2AlC MAX-phase product was studied at 1200 °C for 1, 5 and 10 h in static air. Oxidized specimens revealed progressive increase in mass gain due to a multi-layer oxide scale formation on the surface. A porous TiO2 layer was found to form at the outer surface followed by relatively dense Al2O3 layer towards the inner Ti2AlC MAX-phase. The total thickness of oxide layer was found to increase from ~ 300 to ~ 1300 µm with the progress of time from 1 to 10 h, while oxidation at 1200 °C.