本文介绍一种自制环境等温型高温量热计,其原理基于差热分析。在1300K下所测纯铁等相变热与文献值吻合甚好,证明仪器可靠。应用此仪器系统测量了Fe-Cr-V三元系九种不同成份的α-合金生成焓,以及它们的α-α相变焓。为该体系的热力学研究提供了一些必要的热化学数据。 This article describes a home-made isothermal high temperature calorimeter, the principle based on differential thermal analysis. The measured phase transformation heat of pure iron at 1300K is in good agreement with the literature values, which proves that the instrument is reliable. Using this instrument system, the formation enthalpies of α-alloys of nine different Fe-Cr-V ternary systems and their α-α phase transition enthalpies were measured. It provides some necessary thermochemical data for the thermodynamic study of this system.