(北京科技大學(xué) 特陶中心，北京 100083)
摘 要: 提出了一種制備具有遞變電阻及高熔點差功能梯度材料的新方法—超高壓梯度燒結(jié)法，并成功制備出了相對密度達到96%的W/Cu梯度功能材料。推導(dǎo)了通電燒結(jié)過程中梯度材料內(nèi)部的溫度分布，表明溫度場與電流密度及材料的厚度大致成平方的梯度分布模式；考察了不同的燒結(jié)助劑對W/Cu梯度材料致密化的影響，發(fā)現(xiàn)Ni比V和Zr有更好的致密化效果；觀察了W/Cu梯度材料顯微結(jié)構(gòu)并對梯度燒結(jié)的過程機理進行了初步討。
關(guān)鍵字: 梯度功能材料； 復(fù)合材料； W； Cu； 燒結(jié)
graded sintering under ultrahigh pressure
LI Jiang-tao， YANG Da-zheng， GE Chang-chUn
（University of Science and Technology Beijing，
Beijing 100083， P.R.China）
Abstract: A new approach termed graded sintering under ultrahigh pressure (GSUHP) for fabricating functionally gradient material (FGM) that possesses escalated resistance distribution and large melting point difference was proposed and by which a 96% theoretical density of W/Cu FGM was successfully fabricated. The temperature profile of FGM was simply deduced through energy equation and a graded temperature pattern which is proportional to current density and thickness of FGM squared was obtained. The influence of different binders on densification of W/Cu FGM was investigated， it was found that Ni has better sintering effect than Zr and V have. Microstructures of W/Cu FGM were observed and the mechanism was also preliminarily discussed.
Key words: functionally gradient material (FGM)； composite； tungsten； copper； sintering
