(昆明理工大學(xué) 材料科學(xué)與工程學(xué)院，昆明 650093)
摘 要: 利用自行開(kāi)發(fā)研制的Gasar連鑄裝置，拉制d 15 mm×600 mm的藕狀多孔銅連鑄試樣，并研究氫氣壓力和試樣的下拉速率對(duì)藕狀多孔銅氣孔結(jié)構(gòu)的影響。結(jié)果表明：隨著氫氣壓力及下拉速率的增加，連鑄試樣中氣孔尺寸分布逐漸變得均勻；氣孔率隨氫氣壓力的增大而減小，而下拉速率對(duì)氣孔率的影響不大；隨下拉速率和氫氣壓力的增加，氣孔的形核率增大，氫氣向每個(gè)氣孔的擴(kuò)散量減少，導(dǎo)致氣孔平均孔徑減小及氣孔數(shù)密度增加。
關(guān)鍵字: 多孔材料；藕狀多孔Cu；Gasar連鑄工藝；氣孔率
（Faculty of Materials Science and Engineering, Kunming University of Science and Technology,
Kunming 650093, China）
Abstract:Lotus-type porous Cu specimens with size of d 15 mm×600 mm were fabricated by self-made continuous casting Gasar process. The effects of hydrogen gas pressure and withdraw rate on the pore structures of lotus-type porous Cu were investigated. The results show that the pore size distribution becomes homogeneous gradually with increasing the hydrogen gas pressure and withdraw rate. The porosity decreases with increasing the hydrogen gas pressure, while it is independent of the withdraw rate. With increasing the hydrogen gas pressure and withdraw rate, the hydrogen content diffused in each pore during solidification decreases with an increase in the pore nucleation rate, which leads to the decrease of the average pore diameter and the increase of the pore number density.
Key words: porous material; lotus-type porous Cu; continuous casting Gasar process; porosity
