(西安交通大學(xué) 金屬材料強度國家重點實驗室, 西安 710049)
摘 要: 采用真空高溫?zé)釅喝蹪B燒結(jié)工藝制備出密度為99.5%的納米晶W-Ｃu電觸頭材料。 其組織結(jié)構(gòu)和晶粒大小采用SEM, TEM和XRD觀察。 同時就納米晶W-Cu電觸頭材料的硬度、 電導(dǎo)率、 耐電壓強度和抗電弧燒蝕性與傳統(tǒng)粉末冶金工藝制備的進行了對比分析。 結(jié)果表明， 納米晶W-Cu電觸頭材料的硬度、 抗電弧燒蝕性及耐電壓穩(wěn)定性遠(yuǎn)優(yōu)于傳統(tǒng)熔滲法的W-Cu合金，而電導(dǎo)率兩者相差不大。
關(guān)鍵字: 機械合金化； 納米晶材料； W-Cu電觸頭； 熱壓燒結(jié)
（State Key Laboratory of Metal Material Strength,
Xi′an JiaoTong University, Xi′an 710049, China）
Abstract:Nanostructured (NS) W-Cu composite powder is prepared by the high energy ball milling or mechanical alloying(MA), and W-Cu electrical contact material is fabricated by hot pressed sintering in the vacuum, and nanostructural evolution with milling time is analyzed by SEM, XRD and TEM. The MA NS W-Cu powder compacts sintered at 1200℃ show the high sinterability, resulting in a nearly full density. The microstructure uniformity, hardness, electric erosion and stability of breakdown voltage for NS W-Cu electrical contact material excel that of conventional PM W-Cu alloy, but the electric conductivity is equivalent.
Key words: mechanical alloying; nanostructured materials; hot-press sintering; W-Cu alloy
