A novel low temperature synthesis technique of sol-gel derived nanocrystalline alumina abrasive

作者：Li, Zicheng^*; Zhang, Aiju; Li, Zhihong; Zhu, Yumei; Liu, Liangjun; Xiang, Huiqiang

来源：Journal of Sol-Gel Science and Technology, 2011, 57(1): 24-30.

DOI：10.1007/s10971-010-2319-1

• Synthesis
• Alumina abrasive
• Ball milling
• Co-doped seed
• Two step sintering

The effect of ball milling process, co-doped seed and two step sintering technique on the properties of sol-gel derived alumina abrasive sintered at low temperature was investigated. The results showed that ball milling time with 10 h can be effective in enhancing the activity of the precursor and the microstructural uniformity of sintered alumina abrasive. A small amount of Al(2)O(3)-(NH(4))(3)AlF(6) co-doped seed addition had potential synergistic effects for reducing alpha-Al(2)O(3) phase transformation temperature and improving the mechanical property of alumina abrasive. A remarkable suppression of grain growth was achieved by controlling sintering temperature with two-step sintering method. Therefore, by using ball milling process, co-doping alpha-Al(2)O(3)-(NH(4))(3)AlF(6) seed and two-step sintering technique, the sol-gel derived uniform nanocrystalline alumina abrasive is easily achieved at low temperature. Nanocrystalline alumina abrasive prepared at these conditions exhibited excellent mechanical properties and wear resistance compared to fused corundum abrasive and those sol-gel derived corundum abrasive with conventional sintering methods.

• 出版日期2011-1
• 单位石家庄铁道大学; 天津大学