Mechanical alloying derived SiBCN-Ta4HfC5 composite ceramics: study on amorphous transformation mechanism

Wang, Bingzhu; Wang, Haiwang; Yang, Zhihua; Ye, Shuqun; Jia, Dechang; Guan, Jingyi; Zhou, Yu

doi:10.1016/j.jnoncrysol.2022.121543

Cited by 5 publications

(2 citation statements)

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“…Strong bands at around 1359 cm −1 (D band) and 1575 cm −1 (G band) can be attributed to the structural defects and graphitic carbon, respectively. Raman I D / I G ratio (where I G and I D are the G‐band and D‐band Raman intensity) is widely used to define the degree of defectiveness and disorder in the investigated carbons 42–44 . It can be seen from Figure 5–2 that I D / I G increases with the increase of heat treatment temperature, indicating that the defects in the crystal increase and the amorphous carbon content decreases.…”

Section: Resultsmentioning

confidence: 99%

“…Raman I D /I G ratio (where I G and I D are the Gband and D-band Raman intensity) is widely used to define the degree of defectiveness and disorder in the investigated carbons. [42][43][44] It can be seen from Figure 5-2 that I D /I G increases with the increase of heat treatment temperature, indicating that the defects in the crystal increase and the amorphous carbon content decreases. SEM images of powders after heating showed the particles were still in a nearly spherical hard agglomeration state as shown in Figure 5-3.…”

Section: Microstructures and Chemical Bonding Bondsmentioning

confidence: 99%

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Ta(B, C, N) and (Ta, Mi)(B, C, N) (Mi = Nb, W) ceramics by high‐energy ball milling: processing and solution mechanisms

Guan

Yang

et al. 2022

J Am Ceram Soc.

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In order to study the solid‐solution process between amorphous BCN and metal Ta, Ta(B, C, N), (Ta, Nb)(B, C, N), and (Ta, W)(B, C, N) ceramics were prepared by high‐energy ball milling, and their phase composition, microstructures, and binding bonds have been analyzed. The results show that all the three ceramics are hard agglomeration state, formed by stacking of nanoparticles. The mechanical alloying process is accompanied by the formation of chemical bonds, such as B–Ta, N–Ta, C–Ta, and O–Ta for Ta(B, C, N) ceramic, and the order of solid solution is C > N > B. When heated at 1500°C, a second diboride phase precipitates from (Ta, Nb)(B, C, N) ceramic, whereas the second phase of WC gradually dissolved from (Ta, W)(B, C, N) ceramic. This work provides theoretical and data supporting to analyze the solid‐solution process of Ta(B, C, N) ceramic.

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Section: Resultsmentioning

confidence: 99%

Section: Microstructures and Chemical Bonding Bondsmentioning

confidence: 99%