(1. 云南省貴金屬新材料控股集團(tuán)有限公司，昆明 650106；
2. 昆明貴金屬研究所 稀貴金屬綜合利用新技術(shù)國家重點(diǎn)實(shí)驗(yàn)室，昆明 650106)
摘 要: Au-Pt-Ni體系在燃料電池催化劑領(lǐng)域具有較強(qiáng)的應(yīng)用背景，然而關(guān)于體系合金相圖的研究較少，制約了該體系催化劑的設(shè)計(jì)、開發(fā)及應(yīng)用。通過研究Au-Pt-Ni合金體系的相圖，明確多元合金催化劑在催化反應(yīng)過程中的相平衡關(guān)系，以及合金相的形成對(duì)催化劑性能的改善作用等，有利于尋找改善催化劑性能以及設(shè)計(jì)新型催化材料的新方法。本文分別采用合金法和擴(kuò)散偶法對(duì)Au-Pt-Ni體系進(jìn)行實(shí)驗(yàn)研究；采用合金法研究了體系的450 ℃等溫截面，采用擴(kuò)散偶法研究了體系的900 ℃等溫截面。結(jié)果表明：450 ℃時(shí)Au20Pt10Ni70、Au20Pt30Ni50和Au20Pt50Ni30合金存在三種物相，Au20Pt20Ni60合金存在兩種物相；900 ℃時(shí)體系存在(Au)和(Pt,Ni)兩種固溶體。對(duì)比實(shí)驗(yàn)結(jié)果與計(jì)算相圖發(fā)現(xiàn)，實(shí)驗(yàn)結(jié)果與計(jì)算相圖吻合較好。
關(guān)鍵字: Au-Pt-Ni體系；相圖；合金法；擴(kuò)散偶；鉑基催化劑；貴金屬合金
（1. Sino-Precious Metals Holding Co., Ltd., Kunming 650106, China;
2. State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China）
Abstract:Au-Pt-Ni system has a strong application background in the field of fuel cell catalyst. However, the research on the phase diagram of this system is quite rare, which restricts the design, development and application of this catalyst system. By studying the phase diagram of Au-Pt-Ni system, we can make clear the phase equilibrium of multi alloy catalyst in the process of catalytic reaction, and which phases can improve the performance of catalyst. So as to find new ways to improve the catalyst performance and design the new catalytic materials. The Au-Pt-Ni system was studied by alloying method and diffusion couple method respectively. The isothermal section of Au-Pt-Ni system at 450 ℃ was studied by alloying method. The result shows that there are three phases in Au20Pt10Ni70, Au20Pt30Ni50 and Au20Pt50Ni30 alloys, and two phases in Au20Pt20Ni60 alloy at 450 ℃; The isothermal section of the system at 900 ℃ was studied by diffusion couple method. The result shows that there are (Au) and (Pt,Ni) solid solution phases at 900 ℃. The experimental results are compared with the calculated phase diagram, and it is found that the experimental results are in good agreement with the calculated phase diagram.
Key words: Au-Pt-Ni system; phase diagram; alloying method; diffusion couple; platinum-based catalysts; precious metal alloy
