摘要
热力学计算表明 ,在Al2 O3-SiO2 -ZnO三元系中 ,硅酸锌 (Zn2 SiO4 )和锌铝尖晶石 (ZnAl2 O4 )的吉布斯生成自由能在温度为 16 0 0K以下为负值 ,莫来石 (3Al2 O3·2SiO2 )的吉布斯生成自由能则在温度为 70 0K以上时为负值 ;在系统中Al2 O3富存的条件下 ,Al2 O3可与Zn2 SiO4 反应生成锌铝尖晶石。X射线衍射 (XRD)分析及扫描电子显微镜 (SEM)观察证实 ,通过一定的组成控制和工艺条件 ,能够合成出不含硅酸锌相的刚玉 -莫来石 -锌铝尖晶石复相材料。
The thermodynamic calculation results indicate that in Al 2O 3-SiO 2-ZnO ternary system, the Gibbs free energies of willemite(Zn 2SiO 4) and gahnite(ZnAl 2O 4) are both minus below 1600 K and the Gibbs free energy of mullite(3Al 2O 3·2SiO 2) is minus only above the temperature of 700 K,and keeping Al 2O 3 content enrich in the system,Al 2O 3 will react with Zn 2SiO 4 forming ZnAl 2O 4 and eliminating the Zn 2SiO 4 phase from the system. The investigations of X-ray diffraction (XRD) and scan electron microscope (SEM) confirmed the thermodynamic analysis results.The experimental results indicate that the willemite-free corundum-mullite-gahnite multiphase materials can be synthesized by controlling process factors such as raw materials composition,firing temperature,etc.
出处
《耐火材料》
CAS
北大核心
2004年第2期63-65,69,共4页
Refractories
基金
湖北省自然科学基金 (2 0 0 2AB0 71)
湖北省高温陶瓷与耐火材料重点实验室开放基金资助项目
