Abstract

Alumina (α-Al₂O₃) -an advanced ceramic with high mechanical strength, chemical stability and biocompatibility- can be effectively produced via the sol-gel technique. Seeding approach can be an alternative way to further improve the properties of sol-gel derived α-Al₂O₃ by promoting nucleation and growth. This work concentrates on the chemical/physical, microstructural, and mechanical characteristics of the sol-gel derived and seeded α-Al₂O₃ powders, and pellets. Seeding was applied by using commercial α-Al₂O₃ powders with wt.0%, 3%, 6%, and 10% of the precursor. As the seeding agent amount increased, bulk density values of the pellets also increased. However, the highest bulk density increase was observed for the samples heat treated at 1300 °C. Likewise, the compression strength enhanced but the best results were determined for the samples heat treated at 1300 °C. As the heat treatment temperature increased, heterogeneous grain growth occurred depending on the formation of large pores, and this situation reduced the compression strength.

摘要

氧化铝 (α-Al ₂ O ₃ ) - 一种具有高机械强度、化学稳定性和生物相容性的先进陶瓷 - 可以通过溶胶-凝胶技术有效地生产。播种方法可以是通过促进成核和生长进一步改善溶胶-凝胶衍生的α-Al ₂ O _{3的性质的替代方法。这项工作集中于溶胶-凝胶衍生和晶种 α-Al 2} O ₃粉末和颗粒的化学/物理、微观结构和机械特性。通过使用商业α-Al ₂ O _{3施加晶种}具有 wt.0%、3%、6% 和 10% 前体的粉末。随着晶种剂用量的增加，颗粒的堆积密度值也增加。然而，在 1300 °C 下热处理的样品观察到最高的体积密度增加。同样，抗压强度提高，但最好的结果是在 1300 °C 下热处理的样品。随着热处理温度的升高，大孔的形成导致晶粒不均匀生长，从而降低了抗压强度。