Decomposition of solid alumina in the presence of carbon in vacuum

作者：Feng, Yuebin^*; Hou, Hailan; Yang, Baomin; Yang, Bin; Zi, Futing

来源：Vacuum, 2017, 145: 169-173.

DOI：10.1016/j.vacuum.2017.08.043

• Al2O3
• Decomposition
• Al4O4C
• Al4C3
• Vacuum

The decomposition of solid Al2O3 in the presence of C was researched at 1873 K-2073 K in vacuum, using alpha-Al2O3 powders as the raw materials and the graphite crucible as C source. There was no direct contact between the Al2O3 and the C. The results showed that the Al2O3 decomposed into gaseous species, and the C making up the graphite crucible was reacted to form CO. The coupled reaction was proposed: Al2O3 decomposed into gaseous Al-containing species (mainly Al and Al2O) and O-2, and then C reacted with O-2 to form CO to maintain low O-2 partial pressure, making the decomposition of solid Al2O3 in vacuum possible. With a decrease in temperature, the gaseous products Al, Al2O and CO formed the condensates containing a lot of fibrous materials. The condensates mainly consisted of Al4O4C, Al4C3, Al2O3 and Al, and the content of Al4O4C was the highest.

• 出版日期2017-11
• 单位昆明理工大学