材料科学与工程学报2012，Vol.30Issue(2)：262-266,5.
Al_2O_3/B_4C的致密化机制
Densification of Al_2O_3/B_4C
摘要
Abstract
Al2O3/14%B4C powders with the initial grain sizes of 0.35μm and 7.0μm,respectively,were sintered at different temperatures.Constitutive laws for densification were employed to model the sintering process of Al2O3/B4C ceramics.Based on the constitutive laws employed and the experimental results obtained,the dominant densification mechanism was identified and the effect of grain size on dominant densification mechanism was discussed.The activation energy for densification was also evaluated.In the investigated sintering temperature range,interface reaction was identified as the controlling process in sintering of Al2O3/B4C powders.The activation energy for densification of the Al2O3/14%B4C ceramics was determined as 1820±60KJ.mol-1,which provided a strong support on the densification mechanism.关键词
致密化/晶粒尺寸/扩散/激活能Key words
densification/grain size/diffusion/activation energy分类
化学化工引用本文复制引用
吕延会,黄华伟,王晓敏,杨静,许奎..Al_2O_3/B_4C的致密化机制[J].材料科学与工程学报,2012,30(2):262-266,5.基金项目
国防预研基金资助项目 （）
