工程科学学报2016，Vol.38Issue(1)：102-107,6.DOI:10.13374/j.issn2095-9389.2016.01.014
凝胶注模制备的铝铜坯体脱脂过程及动力学
Thermal degradation mechanism and kinetics of aluminum-copper green bodies prepared by gelcasting
摘要
Abstract
Aluminum-copper green bodies were successfully prepared by a non-aqueous gelcasting system.Scanning electron microscopy observations showed that the powder particles were completely wrapped by the polymer before degreasing,and the polymer in the metal body was completely removed after degreasing.A three-dimensional network polymer structure was obtained by the reaction mechanism.The degreasing process of the metal body was investigated by means of differential scanning calorimetry,thermogravimetry-derivative thermogravimetry and thermogravimetry-Fourier transform infrared spectroscopy.The kinetic equations and parameters were gotten according to Coats-Redfern method for non-isothermal weight loss curves.The results indicate that at different heating rates the reaction order is 1,the activation energy and pre-exponential factor are ranging from 79.86 to 108.63 kJ·mol-1 and 106 to 107 min-1,respectively.The activation energy reaction is sensitive to temperature and dynamics.The degreasing process is divided into two stages:a slight weight loss over a wide temperature range of 240-350 ℃ is due to the random chain scission and the main weight loss around 380 to 425 ℃ is attributed to depolymerization of monomers from the main chains and decrosslinking of the network polymer.The emissions of CO2,CO,NO2 and H2O are identifled during the degreasing process.关键词
凝胶注模/铝铜合金/脱脂/动力学Key words
gelcasting/aluminum-copper alloys/degreasing/kinetics分类
矿业与冶金引用本文复制引用
袁海英,贾成厂,张新新,Bekouche Karima,王召利..凝胶注模制备的铝铜坯体脱脂过程及动力学[J].工程科学学报,2016,38(1):102-107,6.基金项目
国家自然科学基金资助项目(51274041) （51274041）
