机械活化热压制备新型Cu／Cr2Nb触头材料的组织与性能  

The Microstructures and Properties of Novel-Type Cu/Cr_2Nb Contact Materials Fabricated Mechanically Activated Hot-Pressing

作　　者：鲁世强[1] 胡春文[1] 王克鲁[1] 李鑫[1] 肖璇[1] 贺跃辉[2] 

机构地区：[1]南昌航空大学,江西南昌330063 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《稀有金属材料与工程》2009年第5期842-846,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50474009);航空科学基金(05G56003);江西省自然科学基金(0350045);江西省材料科学与工程研究中心基金(ZX200401001)

摘　　要：将Cu、Cr、Nb元素粉经25h机械合金化活化处理后,在1000℃保温1h的工艺下通过真空热压来制备新型Cu/Cr2Nb触头材料,研究了不同成分Cu/Cr2Nb触头材料的组织和性能。结果表明,在机械合金化过程中未能合成出Cr2Nb,但在热压过程中得到了充分合成和析出,所制备的Cu/Cr2Nb触头材料的组织均匀细小,Cr2Nb相尺寸在几个微米。当Cr2Nb含量(质量分数)为25%～35%时,Cu/Cr2Nb触头材料的致密度与熔渗法和热压法制备的常规CuCr50触头材料相当,但前者的硬度和电导率却明显高于后者。Using Cu, Cr, Nb elemental powders activated by mechanical alloying （MA） for 25 h, the novel-type Cu/Cr2Nb contact materials were fabricated by vacuum hot-pressing at 1000℃ for 1 h. The microstructures and the properties of Cu/Cr2Nb contact materials with different compositions were investigated. The results show that Cr2Nb phase can not be synthesized during MA, but can be fully synthesized during vacuum hot-pressing. The prepared Cu/Cr2Nb contact materials have homogeneous and fine microstructures, and Cr2Nb phase sizes fall in several micro. The relative density of Cu/Cr2Nb contact materials with 25%-35% Cr2Nb is comparable with those of CuCr50 prepared by conventional or infiltrating process, but the hardness and conductivity of the former are obviously superior to those of the latter.

关 键 词：Cu/Cr2Nb触头材料:机械合金化 真空热压 组织与性能 

分 类 号：TB33[一般工业技术—材料科学与工程]