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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >TiC nanocrystal formation from carburization of laser-grown Ti/O/C nanopowders for nanostructured ceramics
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TiC nanocrystal formation from carburization of laser-grown Ti/O/C nanopowders for nanostructured ceramics

机译：激光生长的Ti / O / C纳米粉末用于纳米结构陶瓷的渗碳形成TiC纳米晶体

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摘要

Refractory carbide ceramics (TiC and ZrC) raise interest as promising materials for high-temperature applications such as structural materials for the future generation of nuclear reactors. In this context, nanostructured ceramics are expected to exhibit improved thermomechanical properties as well as better behavior under irradiation when compared to conventional materials. It is therefore necessary to synthesize carbide nanocrystals of such materials to elaborate the ceramics. We report here the formation study of TiC nanocrystals through the direct carburization of Ti/O/C nanopowders grown by laser pyrolysis. A spray of titanium tetraisopropoxide was laser pyrolyzed with ethylene as the sensitizer, leading to Ti/O/C nanopowders with various C contents controlled by the synthesis conditions. Annealing treatments performed on these nanopowders under an inert atmosphere without any C addition enabled the formation of TiC grains through the carburization of the oxide phase by free C incorporated during the synthesis. The powders were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The final TiC grain size was about 80 nm, and the grains were monocrystalline. The influence of the free C content on the grain growth during the annealing step, together with its effects on the densification of the ceramics after sintering by high-pressure flash sintering, was examined. A 93% densification was finally achieved.
机译：耐火碳化物陶瓷（TiC和ZrC）作为高温应用的有前途的材料引起了人们的兴趣，例如下一代核反应堆的结构材料。在这种情况下，与常规材料相比，纳米结构陶瓷有望表现出改进的热机械性能以及在辐射下的更好性能。因此，有必要合成这种材料的碳化物纳米晶体以精制陶瓷。我们在这里报告通过激光热解生长的Ti / O / C纳米粉末的直接渗碳对TiC纳米晶体的形成研究。用乙烯作为敏化剂对四异丙氧基钛喷雾进行激光热解，从而制得了具有受合成条件控制的各种C含量的Ti / O / C纳米粉。在不添加任何C的惰性气氛下，对这些纳米粉体进行的退火处理使合成过程中掺入的游离C通过氧化相的渗碳而形成TiC晶粒。通过X射线衍射，扫描电子显微镜和透射电子显微镜对粉末进行表征。最终的TiC晶粒尺寸约为80 nm，且晶粒为单晶。研究了自由C含量对退火步骤中晶粒生长的影响，以及其对高压闪蒸烧结后的陶瓷致密化的影响。最终实现了93％的致密化。

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