武汉科技大学耐火材料与高温陶瓷国家重点实验室培育基地,武汉,430081
网络首发:2010-12-10,
纸质出版:2010
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卫迎锋, 邓承继, 祝洪喜, 等. 镁橄榄石和炭黑为原料合成MgO-SiC-C系复合粉体[J]. 西安交通大学学报, 2010,44(12):105-109.
Synthesizing MgO-SiC-C Refractory Composite Powder from Forsterite and Carbon Black[J]. 2010, 44(12): 105-109.
以湖北宜昌镁橄榄石细粉与炭黑为原料
分别以4种质量比混合均匀
以热固性酚醛树脂作为结合剂
在200 MPa压力下压制成20 mm×20 mm试样
置于110 ℃干燥箱中干燥24 h
然后在高温管式气氛炉中通入氩气作为保护气氛
分别在1 550 ℃、1 600 ℃、1 650 ℃和1 700 ℃保温3 h烧成.对烧成的试样分别进行X射线衍射和扫描电镜检测
结果表明:原料中Fe
2
O
3
杂质经高温烧成后转变为FeSi; 不同试样经不同温度烧成后都含有少量的MgAl
2
O
4
和SiO
2
; 烧成温度与炭黑含量是影响MgO-SiC-C复合粉体合成的重要控制因素
当烧成温度为1 600 ℃
镁橄榄石细粉与炭黑原料的质量分数分别为79.5%、20.5%和74.5%、25.5%时
能够比较好地合成MgO-SiC-C系复合粉体.
The MgO-SiC-C composite powders are prepared using forsterite(Yichang
Hubei province)and carbon black powders as raw materials. Forsterite and carbon black are uniformly mixed in 4 mass ratios with phenolic resin as the binder
and then cold pressed into the specimens with the size of 20 mm×20 mm. The samples are dried at 110 ℃ for 24 hours
and sintered at 1 550 ℃
1 600 ℃
1 650 ℃ and 1 700 ℃
respectively
by holding 3 hours in argon atmosphere. Test results for the sintered samples using XRD and SEM show that after high temperature sintering
Fe
2
O
3
is transformed into FeSi
a few MgAl
2
O
4
and SiO
2
phases exist in samples
and that the sintering temperature and the carbon black content are the key factors to
affect synthesizing of MgO-SiC-C composite powders. The MgO-SiC-C composite powders are synthesized well when the mass fractions of forsterite and carbon black are 79.5% and 20.5% or 74.5% and 25.5% at 1 600 ℃ or 1 650 ℃.
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