贵金属Pd-X(X=Ag, Ni, Sn)体系的相图热力学研究

廖林; 刘树红; 杜勇

doi:10.19976/j.cnki.43-1448/TF.2022003

粉末冶金材料科学与工程 >

2022 , Vol. 27 >Issue 3: 246 - 256

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2022003

理论研究

贵金属Pd-X(X=Ag, Ni, Sn)体系的相图热力学研究

廖林 ,
刘树红 ,
杜勇

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中南大学粉末冶金国家重点实验室,长沙 410083

收稿日期: 2022-01-11

修回日期: 2022-03-12

网络出版日期: 2022-03-25

基金资助

云南省贵金属基因工程重大科技项目(Grant No.202002AB08001-1)

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Thermodynamic investigation on the Pd-X(X=Ag, Ni, Sn) systems of the precious metals

LIAO Lin ,
LIU Shuhong ,
DU Yong

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State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Received date: 2022-01-11

Revised date: 2022-03-12

Online published: 2022-03-25

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摘要

对贵金属Pd-X(X=Ag, Ni, Sn)体系的相图热力学文献数据进行严格评估的基础上,采用替代溶液模型描述该3个二元系中液相和FCC_A1相的吉布斯自由能,分别采用亚点阵模型(Pd,Sn)₁Sn₂、(Pd)_0.25(Pd,Sn)_0.75和(Pd)_0.2(Pd,Sn)_0.8描述PdSn₂、PdSn₃和PdSn₄相,通过CALPHAD(calculation of phasediagram)方法获得描述贵金属Pd-X (X=Ag, Ni, Sn)体系的热力学参数。相较于文献报道,本研究得到的热力学参数能更合理地描述Pd-X (X=Ag, Ni, Sn)体系的实验相图数据和热力学数据,尤其在Pd-Ag相图、Pd-Ag体系和Pd-Ni体系FCC_A1的混合焓及Pd-Sn相图富Sn端零变量反应的描述方面。计算结果与实验数据的比较表明本工作获得的热力学参数的准确性。

关键词： Pd-X (X=Ag,Ni,Sn); CALPHAD; 相图; 热力学性质

本文引用格式

廖林 , 刘树红 , 杜勇 . 贵金属Pd-X(X=Ag, Ni, Sn)体系的相图热力学研究[J]. 粉末冶金材料科学与工程, 2022 , 27(3) : 246 -256 . DOI: 10.19976/j.cnki.43-1448/TF.2022003

Abstract

Based on the critical re-assessment on the phase diagram and thermodynamic data available in literature of the Pd-X(X=Ag, Ni, Sn) systems, Gibbs energies of the liquid and FCC_A1 phases in three binary systems were described by the substitutional solution model. Three phase, PdSn₂, PdSn₃ and PdSn₄,were described by the sublattice model of (Pd,Sn)₁Sn₂, (Pd)_0.25(Pd,Sn)_0.75, and (Pd)_0.2(Pd,Sn)_0.8, respectively. Thermodynamic parameters for the Pd-X(X=Ag, Ni, Sn) systems were then obtained by the CALPHAD (calculation of phase diagram) approach. The presently obtained thermodynamic parameters can describe the measured phase diagram and thermodynamic properties more reasonably comparing with the previous reports, especially in the phase diagram of Pd-Ag system and enthalpies of mixing of FCC_A1 in both Pd-Ag and Pd-Ni systems, as well as the Sn-rich side of the phase diagram of the Pd-Sn system. Comprehensive comparisons between the calculated results and experimental data indicated the accuracy of the presently obtained thermodynamic parameters.

Key words： Pd-X (X=Ag,Ni,Sn); CALPHAD; phase diagrams; thermodynamic property

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