Welcome to Journal of Synthetic Crystals! Today is Jul. 14, 2025 Share:

JOURNAL OF SYNTHETIC CRYSTALS ›› 2022, Vol. 51 ›› Issue (6): 1092-1098.

• Research Articles • Previous Articles     Next Articles

Graphitization of Amorphous Carbon During Synthesis of AlN Powder with Urea as Nitrogen Source

LEI Jun, HUANG Haoxian, XI Xinxin, CHENG Yanling, LIN Huatay   

  1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China
  • Received:2022-03-17 Online:2022-06-15 Published:2022-07-18

Abstract: The residual carbon and carbides were typical phenomenon in the ceramic powder synthesis by a chemical way. The carbon removal process is commonly used, but there were few articles referred to the structure and morphology of residual carbon. In this paper, a precursor salt system with high urea content was adopted to prepare AlN powder by calcination in a nitrogen protective atmosphere. The structure and morphology of the products obtained by calcination in the temperature range from 850 ℃ to 1 500 ℃ were characterized by X-ray diffraction, infrared and Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy. Meanwhile, the changes in the structure and morphology of carbon-containing products during the synthesis of AlN, and the interdependent growth relationship between AlN and carbon-containing products were analyzed. The results show that the graphitization transformation of amorphous carbon is accompanied by the growth of AlN, and the morphology of AlN particles is also affected by the morphology of carbon-containing residual products.

Key words: amorphous carbon, powder synthesis, AlN powder, nitrogen source, urea, residual carbon, graphitization

CLC Number: