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基于重力分离SHS法制备陶瓷内衬复合弯管 ,研究了氧化铁粉末化学组成对SHS复合弯管内衬陶瓷的影响。研究发现 :在加入相同质量分数铝热剂条件下 ,存在于工业原料Fe2 O3粉末中的杂质对燃烧过程的稀释效应比SiO2 添加剂更为强烈 ;在工业原料Fe2 O3+Al体系中加入适量的Fe3O4+Al体系 ,使燃烧温度、蔓延速率及SHS反应转化率均有所提高 ;但加入过量的Fe3O4+Al体系 ,虽可使蔓延速率进一步增大 ,却引起燃烧温度和SHS反应转化率有所下降。实验表明 ,在工业原料Fe2 O3+Al体系中加入 15%的Fe3O4+Al体系 ,可使复合弯管内衬陶瓷性能达到并超过用分析纯Fe2 O3+Al体系所制备的复合弯管内衬陶瓷性能。
Based on the gravity separation SHS method, a ceramic-lined composite pipe was prepared and the effect of the chemical composition of the iron oxide powder on the SHS composite pipe-lined ceramic was investigated. It is found that the dilution effect of the impurities existing in industrial raw material Fe2O3 powder on the combustion process is more intense than that of the SiO2 additive under the condition of adding thermite with the same mass fraction; adding appropriate amount of Fe3O4 in the industrial raw material Fe2O3 + Al system + Al system, the combustion temperature, the spreading rate and the conversion rate of SHS reaction were all increased. However, the addition of excessive Fe3O4 + Al system could increase the propagation rate but decrease the combustion temperature and SHS reaction conversion rate . Experiments show that adding 15% Fe3O4 + Al system to the industrial raw material Fe2O3 + Al system can make the ceramic performance of the composite elbow reach and exceed the composite elbow-lined ceramic prepared by the analytical Fe2O3 + Al system performance.