(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: 以噴霧干燥−氫還原W-10%Cu(質(zhì)量分?jǐn)?shù))、W-20%Cu、W-30%Cu細(xì)晶復(fù)合粉末為原料，制備工字型拉伸樣，并對(duì)粉末成分、燒結(jié)溫度、保溫時(shí)間對(duì)電導(dǎo)率的影響進(jìn)行研究。結(jié)果表明：3種合金中，在1 420 ℃時(shí)W-10%Cu和W-20%Cu的相對(duì)密度較大，達(dá)99.1%；在1 380 ℃時(shí)W-30%Cu出現(xiàn)明顯的致密化，相對(duì)密度最大，達(dá)98.7%。1 420 ℃燒結(jié)1.5 h后材料電導(dǎo)率達(dá)到最大，W-10%Cu、W-20%Cu、W-30%Cu的導(dǎo)電率分別為19、25、30 MS/m，分別超過(guò)GB/T 8320—2003的21.8%、27.2%、23.6%。
關(guān)鍵字: 超細(xì)W-Cu合金；電導(dǎo)率；致密化；微觀組織
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Ultrafine W-10%Cu (mass fraction), W-20%Cu and W-30%Cu composite powders were synthesized by sol-spray drying and subsequent hydrogen reduction process, and then the obtained powders were die-pressed into I-shaped compacts. The effects of powder composition, sintering temperature and holding time on the electric conductivity were investigated. The results show that among the three alloys, the higher relative densities of the W-10%Cu and W-20%Cu compacts can be obtained at 1 420 ℃ and both the values are 99.1%; significant densification occurs at 1 380 ℃ for the W-30%Cu compact and the maximum relative density is approximately 98.7%. When sintered at 1 420 ℃ for 1.5 h, the electric conductivities of W-10%Cu, W-20%Cu and W-30%Cu compacts reach the maximums of 19, 25 and 30 MS/m, which are 21.8%, 27.2% and 23.6% higher than those of GB/T 8320—2003, respectively.
Key words: ultrafine W-Cu alloy; electric conductivity; densification; microstructure
