AgCu_4Ni_(0.3)合金的内氧化动力学、组织结构和性能的研究

Oxidation Kinetics,Structure and Properties of AgCu_4Ni_(0.3) Alloys

内氧化Ag基合金由于具有优良的导电性和导热性而成为一种重要的电接触材料。利用X射线衍射仪(XRD)、光学显微镜(OM)和显微硬度仪对AgCu4Ni0.3合金在大气条件下,700℃时的内氧化行为、组织结构以及性能进行研究,并从热力学和动力学的角度对合金的内氧化机制进行了分析。研究结果表明,在700℃氧化8.5 h后,AgCu4Ni0.3合金的氧化层主要由CuO以及NiO所组成,并没有明显的Ag的氧化物形成。Cu,Ni元素在合金中发生了明显的选择性氧化。横截面形貌表明厚度为0.8 mm的AgCu4Ni0.3合金在大气退火8.5 h后已完全氧化,CuO和NiO颗粒均匀弥散分布于氧化层基体中。内氧化后合金的硬度值(HV)高达126,远高于退火态初始合金的硬度。综上结果表明AgCu4Ni0.3合金在大气条件下的内氧化是可行的,且其内氧化动力学符合抛物线规律。这与AgCuNi合金的内氧化热力学计算结果完全一致,为AgCuNi合金的内氧化生产提供了可靠的理论和实验依据。

The internal oxidized Ag-based alloys were widely used in the electrical contact field for their excellent electrical and thermal conductivities.The internal oxidation behavior,microstructure and properties of AgCu4Ni0.3 alloys under oxygen condition at 700 ℃ were investigated,and the oxidation mechanism was studied in terms of thermodynamics and kinetics.The results showed that after oxidized at 700 ℃ for 8.5 h,the oxidized layer was composed of CuO and NiO,and no Ag oxides were found,which implied that th...