This study focuses on the investigation of the combustion kinetics and mechanisms, as well as the phase and structure formation processes, during elemental self-propagating high temperature synthesis of ceramics in Ta-Si-C system.

Thermodynamic and kinetic features of SHS are discussed. Thermodynamic calculations, time-resolved XRD and investigation of stopped combustion front suggest the following chemical reactions sequence in combustion wave for the Ta-Si-C system: Ta + Si_solid + C → TaC + Si_solid + C → TaC + SiC + Si_liquid + C → TaC + TaSi₂ + Ta₅Si₃ + SiC + Si_solid + C → TaSi₂ + SiC.

Significant microstructure refinement occurs due to the formation of SiC within the TaC, Ta₅Si₃ and TaSi₂ particles during the SHS. Combustion products consist of agglomerated SiC and TaSi₂ particles with the size of individual grains equal to 15–50 nm. Hot pressing of TaSi₂-SiC powders at 1600 °C produces the bulk nanocomposites with a relative density of 97%. In comparison to similar materials reported in the literature, bulk SHS composite TaSi₂-30%SiC exhibits superior hardness (19.1 GPa) as well as fracture toughness (6.7 MPa m^1/2) and shows a great potential for application as a structural material and as a precursor for ion-plasma deposition of high-temperature tribological coatings.

这项研究的重点是在Ta-Si-C系统中陶瓷的元素自蔓延高温合成过程中研究燃烧动力学和机理，以及相和结构形成过程。

讨论了SHS的热力学和动力学特征。热力学计算，时间分辨XRD和停止燃烧前沿的研究表明，Ta-Si-C系统燃烧波中的化学反应顺序如下：Ta + Si_固体 + C→TaC + Si_固体 + C→TaC + SiC + Si_液体 + C→TaC + TaSi ₂  + Ta ₅ Si ₃  + SiC +_固体Si  + C→TaSi ₂  + SiC。

在SHS期间，由于TaC，Ta ₅ Si ₃和TaSi ₂颗粒内形成SiC，从而显着改善了微结构。燃烧产物由凝聚的SiC和TaSi ₂颗粒组成，每个颗粒的大小等于15–50 nm。TaSi ₂ -SiC粉末在1600°C的温度下热压可生产相对密度为97％的块状纳米复合材料。与文献中报道的类似材料相比，块状SHS复合材料TaSi ₂ -30％SiC表现出优异的硬度（19.1 GPa）和断裂韧性（6.7 MPa m ^1/2）），并显示出作为结构材料和高温摩擦涂层的离子等离子体沉积前体的巨大潜力。