NdFeB合金电场低温快速烧结致密化研究  

Study on Low Temperature Densification of NdFeB Alloy by Electric Field Rapid Sintering

作　　者：杨刚[1] 杨屹[1] 卢东[1] 刘颖[2] 

机构地区：[1]四川大学制造科学与工程学院,四川成都610065 [2]四川大学材料科学与工程学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2011年第5期213-217,共5页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(50945018)

摘　　要：为研究电场快速烧结致密化,将未经过脱氢和未彻底脱汽油预处理的NdFeB合金压坯在富Nd相的液相线温度下进行了电场烧结。研究发现,当压坯以500℃/s的预设升温速度升温并在600℃烧结5 min后,压坯即实现了烧结致密化。对压坯电场烧结过程中的温度场特性分析认为,未预处理的NdFeB合金压坯升温过程中在大电流电场作用下,压坯内出现的等离子体与焦耳热和场致发射共同作用产生的高温,使压坯内出现了大量的瞬时微区高温液相,富Nd液相加速扩散,从而使压坯能够在低的表观温度下实现快速烧结致密化。In order to study the densification of electric field rapid sintering,the incompletely disengaged hydrogen and gasoline pretreated NdFeB alloy compact was sintered by an electric field under the temperature of liquid Nd-rich phase.It was found that when the compact was heated with the heating rate of 500 ℃/s and sintered for 5 minutes at 600 ℃ by an electric field,the sintered compact finished densification.According to the analyses for the compact temperature characteristics of electric field sintering,it was suggested that in the course of temperature rising for the unpretreated NdFeB alloy compact,the high temperature caused by plasma,joule heat and field emission results in enormous instantaneous micro-zone high temperature fluid phases arising in the compact under the effect of huge current electric field,and rapid diffusion of the fluid Nd-rich phases,making the compact realize rapid sintering densification at low temperature.

关 键 词：NDFEB合金 电场烧结 预处理 瞬时微区液相 低温致密化 

分 类 号：TM271[一般工业技术—材料科学与工程]