摘要
以铝灰、粉煤灰和碳黑为主要原料,采用碳热铝热复合还原氮化工艺制备了Sialon粉体。研究了原料组成(Si/Al比分别为1.5、1和0.27)、碳黑含量(分别为10%、17%、22%和27%)以及合成反应温度(分别为1400,1450,1500℃)对生成物相的影响。结果表明,合成温度为1450℃,可以得到较纯的物相;随着还原剂碳黑含量的增加,使还原氮化反应进行的更为充分;在原料中Si/Al比为1时,加入17%的碳黑可以得到主要物相为Si3Al3O3N5(β-Sialon,z=3)和SiAl4O2N4(15R)的产物;在原料中Si/Al比为1.5时,即加入80%的粉煤灰,在1450℃可以制备较纯的Si3Al3O3N5粉。
Sialon powders were synthesized using aluminium dross, fly ash and carbon black as main starting materials by the C-Al compound reduction and nitridation process. The effects of different factors on the phase of products were studied, such as the compositions of raw material （the proportion of Si/Al is 1.5, 1 and 0.27）, the content of carbon black （10%, 17%, 22% and 27%） and heating temperature （1400, 1450 and 1500℃）. The results show that the relatively pure Sialon powders can be obtained at 1450 ℃; the process of reduction-nitridation is effectively accelerated by the increase of the carbon black content. When the proportion of Si/Al is about 1, the main phases of products are Si3Al3O3Ns（β-Sialon, z=3） and SiAl4O2N4（15R） using 17% carbon black; at 1450℃, a nearly pure Sialon powder （ the main phase is Si3Al3O3Ns） can be obtained when the proportion of Si/Al is about 1.5 and the fly ash content is 80%.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第A02期44-47,共4页
Rare Metal Materials and Engineering
基金
国家杰出青年科学基金(50825401)
上海市科委资助项目(07dz12028
08xd14231)
关键词
铝灰
粉煤灰:SiMon
碳热还原氮化法
aluminium dross
fly ash
Sialon
carbothermal reduction nitridation
