求高手分析一张TG-DSC图

应助达人

无定形的氧化铝是用啥方法合成的？它会有很多结构性脱水、相变，你可以单独做一个无定形的氧化铝的，可能会有助于你对样品的分析。900-1000度的峰可以和失重对上。

无定形的氧化铝是买的。我就想知道900-1000℃吸热峰和失重最可能的是什么？

应助达人

贴篇文摘供你参考，还是建议你做一个无定形氧化铝作对比。还有，气氛也是有影响的。
Surface oxidation of Al2O3/SiC nanocomposite: Phase transformation and microstructure
作者: Cai, S (Cai, S); Peng, ZZ (Peng, ZZ); Feng, J (Feng, J); Lu, F (Lu, F)
来源出版物: JOURNAL OF RARE EARTHS 卷: 23 期: 4 页: 429-432 文献号: PII 1002-0721(2005)04-0429-04 出版年: AUG 2005

摘要: The surface oxidation behavior of pressureless sintered Al2O3/SiC nanocomposite was studied from 1000 to 1400 degrees C for more than 10 h in air. Weight gain during the process of heat treatment was measured by TG analysis. Phase transformation and microstructure changes of these specimens due to oxidation were investigated with X-ray diffraction (XRD), SEM and EDX technology. Thermogravimetric analysis show that the weight gain as a result of oxidation of SiC become significant above 1200 degrees C. In the range of 1000 - 1300 degrees C, the SiC grits are usually coated with a layer of amorphous silica after oxidation. Above 1300 degrees C, the amorphous silica reacted with alumina matrix and formed mullite or crystallized into cristobalite. The rate of oxidation depends on the formation of dense cristobalite film. Large amount of needle-like mullite and alumina crystals are formed on the surface after oxidation at 1400 degrees C.