燃烧合成AlN/Y_2O_3陶瓷及致密化机理分析

Raction Synthesis of Y_2O_3/AlN Ceramic and Mechanism of Densification

采用 SHS工艺 ,在 1 0 0 MPa的高压氮气下 ,制备了具有较高致密度的 Al N/Y2 O3陶瓷。结果显示 ,Al- N2 - Y2 O3体系的 SHS过程中 ,当反应温度升至 1 760℃时 ,Y2 O3与 Al2 O3形成共晶液相 Y3Al5O12 ,发生液相烧结。随着 Y2 O3含量的增加 ,液相烧结作用增强 ,产物致密度显著提高 ,抗弯强度及断裂韧性提高。Al- N2 - Y2 O3体系的 SHS致密化主要发生在燃烧波蔓延方向 ,具有明显的方向性。

WT5BZ]Compact AlN/Y 2O 3 ceramics were fabricated by combustion synthesis of Al particles in the super high pressure nitrogen (1000atm) In the SHS process of Al N 2 Y 2O 3 system, when the temperature was up to 1760℃ ,eutectic melt Y 3Al 5O 12 was formed from Y 2O 3 and Al 2O 3,then liquid sinter occurred With increasing of Y 2O 3 content in the original powder system, porosity of the products decreased, content of the plastic Al in the products increased, then bending strength and fracture toughness increased In Al N 2 Y 2O 3 system, SHS densification have apparent tropism, mainly occurred along the combustion front