文献类型：期刊文献

中文题名：二步煅烧法制备高热稳定性无定形SiO_(2)-Al_(2)O_(3)复合粉体

英文题名：Preparation of High Thermal Stability Amorphous SiO_(2)-Al_(2)O_(3) Composite Powder by Two-Step Calcination

作者：侯金麟[1];李蔚[1]

机构：[1]华东理工大学材料科学与工程学院,上海200237

年份：2024

卷号：50

期号：3

起止页码：360

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：;Scopus;北大核心:【北大核心2023】；CSCD:【CSCD_E2023_2024】；

语种：中文

中文关键词：无定形SiO_(2)-Al_(2)O_(3)复合粉体;二步煅烧法;热稳定性;硫酸铝铵;葡萄糖

外文关键词：amorphous SiO_(2)-Al_(2)O_(3)composite powder;two-step calcination;thermal stability;ammonium aluminium;glucose

摘要：采用二步煅烧法制备了高热稳定性无定形SiO_(2)-Al_(2)O_(3)复合粉体。首先以十二水合硫酸铝铵和葡萄糖为原料混合煅烧制备无定形Al_(2)O_(3)前驱体,然后以正硅酸乙酯形式向无定形Al_(2)O_(3)中引入适量的SiO_(2),煅烧后即可获得具有高热稳定性的无定形SiO_(2)-Al_(2)O_(3)复合粉体。当SiO_(2)引入量为26%(质量分数)时,粉体经950℃下煅烧4 h仍为无定形结构;对前驱体进行研磨后,粉体热稳定性进一步提升,在1 020℃下煅烧4 h仍为无定形结构。研究表明,SiO_(2)引入量和前驱体混合均匀性对复合粉体的高温热稳定性有明显影响。
Amorphous SiO_(2)-Al_(2)O_(3) composite powder with high thermal stability was prepared by two-step calcination method.Firstly,amorphous Al_(2)O_(3) precursor was prepared by mixed calcination of ammonium aluminum sulfate dodecahydrate and glucose,and then appropriate SiO_(2) was introduced into amorphous Al_(2)O_(3) in the form of ethyl orthosilicate.Amorphous SiO_(2)-Al_(2)O_(3) composite powder with high thermal stability can be obtained after calcination.When SiO_(2) introduction mass fraction is 26%,the powder remains amorphous structure after 4 h calcination at 950℃.After wet grinding of precursor,the thermal stability of the powder is further improved,and the powder remains amorphous structure after 4 h calcination at 1020℃.The results show that the amount of SiO_(2) and the mixing uniformity of precursors have obvious effects on the high temperature thermal stability of the composite powders.