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Nitriding study of titanium silicide intermetallics obtained by mechanical alloying

机译：机械合金化制备硅化钛金属间化合物的氮化研究

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摘要

Titanium and silicon powder blends were ball-milled under an inert atmosphere and subsequently annealed in a nitrogen atmosphere. Ti_(62.5)Si_(37.5), Ti_(55.6)Si_(44.4), and TisoSiso mixtures suffered a mechanically induced self-propagating reaction during milling. The products of the combustion were Ti_5Si_3 for the Ti_(62.5)Si_(37.5) mixture and a combination of intermetallic phases for the Ti_(55.6)Si_(44.4) and Ti_(50)Si_(50) mixtures. The Ti_(33.3)Si_(66.7) blend did not show an MSR process, but prolonged milling allowed the formation of a mixture of stable C54-TiSi_2 and metastable C49-TiSi2 by a diffusion reaction. The nitriding study showed a different behaviour for C54-TiSi_2 and Ti_5Si_3. C54-TiSi_2 nitriding took place in a two-step process: the first corresponded to the formation of TiN and Si and the second to the silicon nitriding leading to the formation of a- and beta-Si_3N_4. However, silicon and titanium nitriding primarily occurred simultaneously during the annealing of Ti_5Si_3, and the final product was a mixture of TiN and alpha-Si_3N_4.
机译：将钛和硅粉末混合物在惰性气氛下进行球磨，然后在氮气气氛中进行退火。 Ti_（62.5）Si_（37.5），Ti_（55.6）Si_（44.4）和TisoSiso混合物在研磨过程中发生机械诱导的自蔓延反应。对于Ti_（62.5）Si_（37.5）混合物，燃烧产物是Ti_5Si_3，对于Ti_（55.6）Si_（44.4）和Ti_（50）Si_（50）混合物，燃烧产物是金属间相的组合。 Ti_（33.3）Si_（66.7）共混物未显示MSR过程，但长时间研磨可通过扩散反应形成稳定的C54-TiSi_2和亚稳态C49-TiSi2的混合物。渗氮研究表明，C54-TiSi_2和Ti_5Si_3的行为不同。 C54-TiSi_2氮化过程分两步进行：第一步对应于TiN和Si的形成，第二步对应于硅氮化，导致a-和β-Si_3N_4的形成。但是，氮化硅和钛主要在Ti_5Si_3的退火过程中同时发生，最终产物是TiN和α-Si_3N_4的混合物。

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