摘要
利用相图计算技术（ＣＡＬＰＨＡＤ）对Ｆｅ－Ｔｉ－Ｃ燃烧合成反应体系进行热力学分析，着重研究Ｆｅ含量和Ｃ／Ｔｉ原子比对体系绝热燃烧温度Ｔａｄ和平衡相组成的影响．研究结果表明，Ｆｅ含量对 Ｆｅ－Ｔｉ－Ｃ三元系的平衡相组成影响不大，但对绝热燃烧温度的影响非常大．当保持Ｃ／Ｔｉ原子比接近１．０时，不管Ｆｅ含量如何变化；在２９８Ｋ下均会得到理想的平衡相组织ＴｉＣ＋Ｆｅ 随Ｆｅ含量增加，体系的绝热燃烧温度大致呈线性降低．Ｆｅ－Ｔｉ－Ｃ体系发生ＳＨＳ反应的热力学条件之一（Ｔａｄ＞１８００Ｋ）是Ｆｅ＜５５ｗｔ％．而 Ｃ／Ｔｉ原子比对绝热燃烧温度的影响比较小，但对平衡相组成影响非常大，主要表现在两个方面：①石墨相的析出温度不同．随Ｃ／Ｔｉ原子比降低，析出温度也随之降低．②在各温区石墨相的含量不同．当 Ｃ／Ｔｉ在１．０～１．４变化时，石墨相含量在低温区由１％提高到１６％．
The thermodynamics of Fe-Ti-C system was calculated by the calculation of phase diagram (CALPHAD) method to investigate the influences of Fe content and C/Ti atomic ratio on the adiabatic temperature (T-ad) and equilibrium phases. It is revealed that Fe content has more effects on the adiabatic temperature than on equilibrium phases. The desired equilibrium phases (TiC+Fe) can be obtained no matter how Fe content value varies when C/Ti (atomic ratio) is fixed as about 1.0. The combustion synthesis reaction of Fe-Ti-C system can be ignited thermodynamically with Fe weight content up to 55%. C/Ti atomic ratio has more effects on the equilibrium phases than on adiabatic temperature, The temperature of graphite appearing decreases when C/Ti (atomic ratio) reduces. And the graphite content varies from about 1% to 16% when C/Ti (atomic ratio) varies from 1.0 to 1.4 at low combustion temperature.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第2期288-292,共5页
Journal of Inorganic Materials
基金
国家863计划资助项目(715-009-0130)
