摘要
在尖晶石材料中分别加入3%、5%和10%的MoSi2细粉,分别在1000℃、1200℃、1500℃下烧成,研究了MoSi2对尖晶石材料烧结性能的影响。结果表明:(1)在不含镁砂细粉的尖晶石试样中,添加剂MoSi2易发生氧化,生成膨胀系数较大的MoO3,试样容易破碎;(2)同时添加MoSi2和镁砂细粉的尖晶石试样能在较低温度下开始烧结,在1200℃下能达到一定程度的烧结,发生的反应方程式为:2MoSi2+7O2+2MgO=2MgMoO4+4SiO2,但MgMoO4在>1200℃时不稳定,易与Al2O3发生反应,反应方程式为:MgMoO4+Al2O3=MoO3+MgAl2O4;(3)过多MoSi细粉的加入会引起试样较大的体积膨胀。
The influence of MoSi2 on the sintering performance of spinel products was researched by adding 3%, 5% and 10% MoSi2 powder respectively in spinel material and firing the specimens at 1000°C, 1200°C and 1500°C respectively. The result shows that: (1) The spinel specimens without adding MgO powder is easily broken because MoO3 with high expansion coefficient formed in the specimen due to the oxidation of MoSi2; (2) The spinel specimens adding MgO powder and MoSi2 can be sintered at lower temperature, and can be sintered to a certain degree at 1200°C, the reaction equation is: 2MoSi2+7O2+2MgO = 2MgMoO4+4SiO2. At the temperature above 1200°C, MgMoO4 is unstable and easy to react with Al2O3: MgMoO4 + Al2O3 = MoO3+MgAl2O4. (3) Excessive MoSi2 powder will cause high expansion of the specimens.
出处
《耐火材料》
EI
CAS
北大核心
2005年第3期172-175,共4页
Refractories
