(1. 哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱 150001；
2. 沈陽工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院， 沈陽 110023)
摘 要: 在傳統(tǒng)平面流鑄技術(shù)的基礎(chǔ)上，研究出一種新的金屬粉末制取技術(shù) 改性平面流鑄粉末化技術(shù)。 將改性平面流鑄粉末化工藝過程分為平面液流的形成、平面液流的破碎和金屬粉末的形成3個主要階段，對這3個階段建立了完整的數(shù)學(xué)模型，并對Sn60Pb40合金粉末化過程進行了數(shù)值計算。計算了平面液流形成過程動態(tài)熔潭中熔融金屬液的溫度場和流場，以及所得金屬粉末的尺寸，計算結(jié)果與實驗結(jié)果相吻合。考察了噴嘴幾何尺寸、霧化室氣氛氣體密度等主要工藝參數(shù)對改性平面流鑄粉末化工藝的影響。
關(guān)鍵字: 粉末冶金； 平面流鑄； 金屬霧化； 數(shù)學(xué)模型； 數(shù)值計算
modified planar flow casting atomization
（1. School of Materials Science and Engineering,
Harbin Institute of Technology,Harbin 150001， P.R.China;
2. School of Materials Science and Engineering,
Shenyang University of Technology, Shenyang 110023, P.R.China）
Abstract:Based on the traditional planar flow casting technique, a new powder process named modified planar flow casting atomization was developed. The whole atomization process can be divided into three main stages, namely, the formation of a thin liquid metal ribbon, the disintegration of the molten metal ribbon and the obtaining of metal powder. A complete mathematical model for these three stages was established, and numerical computation of the modified planar flow casting atomization process for Sn60Pb40 alloy was carried out. The flow field and temperature field of molten metal in the dynamic puddle between the nozzle and wheel gap were simulated during the course of liquid metal ribbon formation, and the sizes of metal powder produced were numerically computed. It was found that the computed results agreed well with the experimental ones. The effects of main technological parameters, such as nozzle size, air density in the atomization box, on the modified planar flow casting atomization process were discussed.
Key words: powder metallurgy; planar flow casting; metal atomization, mathematical model; numerical computation
