纳米AlN粉末的低温热压  

Hot press sintering of nano-sized AlN powders at low temperature

作　　者：张春祥[1] 骆俊廷[1] 李洪波[1] 

机构地区：[1]燕山大学机械工程学院,亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004

出　　处：《粉末冶金技术》2009年第5期369-372,共4页Powder Metallurgy Technology

基　　金：中国博士后科学基金资助项目(20060400787)

摘　　要：研究了纳米AlN陶瓷在1500～1700℃的低温热压行为和力学性能。热压温度为1600℃时，产物是β-AlN和β—Al2O3两相共存；当温度提高至1700℃后，热压过程中出现由β-AlN到α-AlN相的转变。随着热压温度的提高，断裂形式由沿晶断裂逐渐向穿晶断裂转变，致密度逐渐提高，晶粒尺寸长大；当热压温度达到1700℃时，相对密度为97．3％，晶粒平均直径为850nm，硬度值为15．54GPa，断裂韧度为3．5MPa-m^1/2。Uhrafine nano-sized AlN powders were hot pressed at low temperature of 1 500 -1 700℃ and mechanical properties were investigated. β-AlN and β-Al2O3 are detected when the hot pressing temperature is 1 600℃. The phase transition β-AlN to α-AlN was discovered at a 1 700℃ hot pressing temperature. Relative density and average grain size were increase with the increasing of hot pressing temperature, and fracture form is intererystalline crack at 1 500℃ and transerystalline crack at 1 700℃. Relative density of 97.3% , average grain size of 850nm. Vickers hardness of 15.54GPa and fracture toughness of 3.5MPa · m1/2 are obtained at 1 700℃.

关 键 词：纳米AlN 热压 力学性能 

分 类 号：TQ174.1[化学工程—陶瓷工业] TS653.5[化学工程—硅酸盐工业]