(中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室， 長(zhǎng)沙 410083)
摘 要: 采用真空燒結(jié)和氮?dú)鈿夥毡Ｗo(hù)燒結(jié)制備了Cu-ZnO(10)復(fù)合材料，測(cè)定了其密度、 硬度、 抗彎強(qiáng)度及電阻率， 采用SEM和金相顯微技術(shù)分析了材料的顯微組織， 并將所制得的Cu-ZnO(10)復(fù)合材料的性能與銀氧化物觸頭材料進(jìn)行對(duì)比。 結(jié)果表明： 由于在氮?dú)鈿夥障掠?60 ℃燒結(jié)時(shí)， 燒結(jié)進(jìn)程不徹底， ZnO揮發(fā)帶較窄及ZnO相在基體Cu內(nèi)形成了網(wǎng)絡(luò)分布，使其所制備試樣的抗彎強(qiáng)度低于真空氣氛燒結(jié)試樣的； 在所制備的Cu-ZnO(10)材料中， Cu和ZnO兩相間存在明顯的界面， 產(chǎn)生相互擴(kuò)散， 且兩相結(jié)合良好； 在真空氣氛下960 ℃燒結(jié)（保溫時(shí)間1 h）的Cu-ZnO(10)復(fù)合材料的綜合性能最好，是制備Cu-ZnO(10)復(fù)合材料的較好工藝， 所制得的Cu-ZnO(10)的相對(duì)密度大于98%， 電阻率小于2.70 μΩ·cm， 硬度大于670 MPa， 與銀氧化物觸頭材料的物理性能相當(dāng)。
關(guān)鍵字: Cu-ZnO(10)復(fù)合材料； 微觀結(jié)構(gòu)； 燒結(jié)氣氛
Cu-ZnO(10) composite material
ZOU Jian-peng, WAN Qian
（ State Key Laboratory of Powder Metallurgy,
Central South University, Changsha 410083, China）
Abstract: The Cu-ZnO(10) composite materials were successfully fabricated by vacuum sintering and N2-protecting sintering. The density, hardness, bending strength and resistivity of the Cu-ZnO(10) materials were tested. The component and microstructure were analyzed by SEM and metallographic analysis technology. Furthermore, the properties of Cu-ZnO(10) and silver-oxide contact materials were compared. The results show that the bending strength of samples sintered in N2 atmosphere is lower than that of samples sintered in vacuum atmosphere because sintering process of samples are not complete at 960 ℃ in N2 atmosphere, the volatile area of ZnO in samples sintered in N2 atmosphere is narrower than that of samples sintered in vacuum atmosphere, ZnO distributes meshyly in Cu matrix. There exists obvious interface between the two phases of Cu and ZnO in the Cu-ZnO(10) material, and the two phases diffuse each other. Moreover, sintering in vacuum atmosphere and heat preserving for 1 h are the preferable technics to prepare Cu-ZnO(10) material. Cu-ZnO(10) material has the best integrative properties such as the two phases of Cu and ZnO combining firmly, the relative density over 98%, the resistivity below 2.70 μΩ·cm and the rigidity over 670 MPa. Altogether, the physical properties of Cu-ZnO(10) material are close to that of silver-oxide material.
Key words: Cu-ZnO(10) composite material; microstructure; sintering atmosphere
