(湖南大學(xué) 材料科學(xué)與工程學(xué)院， 長(zhǎng)沙 410082)
摘 要: 采用高壓氮?dú)鉃闅庀囔F化介質(zhì)，分別以NaCl顆粒和Fe粉為固相霧化介質(zhì)， 對(duì)Al-Si合金、 金屬Zn進(jìn)行固氣兩相流霧化實(shí)驗(yàn)， 系統(tǒng)研究了工藝參數(shù)對(duì)粉末平均粒度和形貌的影響規(guī)律。結(jié)果表明， 固氣兩相流霧化存在最佳的固/氣流率比，采用的固體介質(zhì)顆粒只有既達(dá)到較高的濃度又具有較高速度， 才能極大地提高霧化效果。 同時(shí)， 較高密度的固體介質(zhì)、 低金屬液流量有利于獲得平均粒度細(xì)小、 形貌復(fù)雜、粒度分布更集中的金屬粉末。
關(guān)鍵字: Al-Si合金； 鋅； 霧化； 粉末； 介質(zhì)
（ College of Materials Science and Engineering,
Hunan University, Changsha 410082, China）
Abstract: Al-Si alloy and metal zinc were selected as the samples to study the effects of atomization parameters on mean particle size, particle size distribution and particle morphology of the as-atomized powder with N2 employed as the gas atomization medium and NaCl, Fe particle as solid atomization medium respectively. The results show that the metal powder with finer mean particle size and narrow particle size distribution can be produced under the conditions of proper mass flow rate of solid to gas in atomization medium, higher density of solid medium and lower metal mass flow rate.
Key words: Al-Si alloy; Zinc; atomization； powder； medium
