Mechanical alloying derived SiBCN-Ta4HfC5 composite ceramics: study on amorphous transformation mechanism
Source abstract
Abstract
In order to study the amorphization transformation process of SiBCN-Ta 4HfC 5 ceramic during mechanical alloying, SiBCN-Ta 4HfC 5 amorphous-nanocrystalline powders were prepared and the evolution of phase, chemical valence bond and morphology of the samples during mechanical alloying were analyzed by XRD, FT-IR, Raman, XPS, SEM and TEM. In addition, the mechanism of amorphous transformation of SiBCN-Ta 4HfC 5 was revealed. The results show that h-BN and graphite are preferentially transformed into amorphous state, while c-Si is finally amorphized. The amorphous process of c-Si was accelerated by the introduction of nano-Ta 4HfC 5. The mechanical alloying process is accompanied by the formation of chemical bonds such as B-C-N, N-C and Si-C. However, Ta 4HfC 5 is still distributed in amorphous SiBCN in the form of nanocrystals.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · MXene and MAX Phase Materials · Advanced materials and composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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