电爆炸一步法制备Cu—Zn合金超细微粉

ONE-STEP PREPARATION OF ULTRAFINE Cu-Zn ALLOYPOWDERS BY ELECTRICAL EXPLOSION METHOD

利用电爆炸方法以Ｃｕ６０．２Ｚｎ３９．８石合金（α相）丝为原料一步制备出该合金的超细微粉Ｘ射线衍射测量结果表明，获得的合金超细微粉的晶体结构中主要是α相，并伴有β，γ和ε相，用透射电镜观察到粒子形貌大部分呈六边形，少量为正方形及球形粒子尺寸在３０到１８０ｎｍ之间（平均尺寸为８５ｎｍ）．ＥＤＸ测试表明，电爆炸产物Ｃｕ－Ｚｎ合金不同粒子中Ｚｎ的含量在６．９％到４５．２％（原子分数）之间变化，提出了超细微粉的形成机制．

Ultrafine powders of Cu-Zn alloy ranging from 30 to 180 urn in size and with a meanparticle size of 85 urn were prepared from or-Cu-Zn alloy wire containing 39.8% Zn (atomic fraction) by anelectrical explosion method. The particles were identified as a mixture of a, B,r and phases of Cu-Znalloy by X-ray powder diffraction (XRD). Most of the powders are hexagonal in shape, with only a smallpart being spherical and cubic. The composition of Zn in the explosion products varies from 6.9 to 45.2%(atomic fraction) in differemt particles as determined by Energy Dispersive X--ray spectometer (EDX). Apossible mechanism for the formation of the alloy nanoparticles was proposed.