(華南理工大學(xué) 機械與汽車工程學(xué)院，廣州 510640)
摘 要: 利用高能球磨方法對Cu-10Cr-0.5Al2O3(質(zhì)量分數(shù)，%)混合粉末進行預(yù)處理，采用電場活化燒結(jié)技術(shù)對球磨粉末進行燒結(jié)，運用XRD、SEM、硬度、斷裂強度和電導(dǎo)率等測試方法, 研究球磨時間對Cu-10Cr-0.5Al2O3復(fù)合粉末燒結(jié)前后組織和性能的影響。結(jié)果表明：隨著球磨時間的增加，Cu晶粒更加細化，第二相分布更加彌散，以致燒結(jié)材料的強度和硬度逐漸增大，球磨20 h后，燒結(jié)樣品的強度和硬度分別達到952 MPa和285 HV；由于晶粒細化、高度彌散的第二相以及銅相的晶格畸變加強對電子的散射作用，燒結(jié)試樣的電導(dǎo)率也隨球磨時間的延長而逐漸下降，球磨20 h后,燒結(jié)樣品的電導(dǎo)率下降到51%(IACS)。
關(guān)鍵字: 銅基粉末；第二相；高能球磨；電場活化燒結(jié)
structure and performance of Cu-10Cr-0.5Al2O3
（School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China）
Abstract:Cu-10Cr-0.5Al2O3 (mass fraction, %) powder mixtures were pretreated by high-energy ball milling and subsequently sintered by electric field activated sintering technique. The influence of milling time on the structure and performance of Cu-10Cr-0.5Al2O3 before and after sintering was studied by XRD, SEM, hardness, rupture strength and conductivity test. The results show that, with increasing the milling time, the Cu grain size decreases and the distribution of the second phase becomes more uniform, consequently the strength and hardness of the sintered samples increase and reach 952 MPa and 285 HV, respectively, after powders milled for 20 h. Because of the grain refinement, the uniform distribution of second phase and the lattice distortion of Cu phase, the electron scattering in the sintered samples is enhanced, causing a decrease of conductivity. After 20 h milling, the conductivity of sintered samples decreases to 51%(IACS).
Key words: copper base powders; second phase; high-energy ball milling; electric field activated sintering
