金属热还原法制备钛铝中间合金

Preparation of TiAl Alloy by Metallothermic Reduction

摘要:

钛铝中间合金的低成本制备是当前研究的一个重要方向。本文以TiO₂为原料,KClO₃为发热剂,Al为还原剂和合金化剂,Ca为深度还原剂,通过金属热还原法制备钛铝中间合金,考察了单位质量热效应、造渣剂配比和还原剂加入量及组成对反应过程稳定性、合金成分及收率的关系。研究表明：用Ca和Al做还原剂时,体系绝热温度分别是2426 K和1806 K,反应制得的钛铝中间合金由TiAl、Ti₃Al和少量的Al₂O₃夹杂相组成,化学分析合金中Ti、Al、O含量分别为58.36%,40.19%和1.41%。

Abstract:

The low cost preparation of TiAl master alloy is an important direction of current research. In this paper, TiO2 as raw material, KClO3 as heating agent, Al as reducing agent and alloying agent, Ca as deep reducing agent were used for the preparation of TiAl master alloy by metallothermic reduction method. The heat effect per unit mass, the proportion of slag-making agent, the amount and composition of reducing agent on the stability of the reaction process, the composition and yield of alloy were investigated. The results showed that when Ca and Al were used as reducing agents, the adiabatic temperature of the system was 2426 K and 1806 K, respectively. The TiAl master alloy was composed of TiAl, Ti3Al and a small amount of Al2O3 inclusions. The contents of Ti, Al and O in the alloy were 58.36%, 40.19% and 1.41%, respectively.