含铁铜基陶瓷复合材料高温氧化行为与耐磨性研究

在25,250,350和450℃高温摩擦磨损实验条件下,对两种不同铁含量的Cu基摩擦材料进行高温氧化行为及耐磨性研究。结果表明:Fe在Cu基体中的尺寸、分布影响Cu基摩擦材料的高温抗氧化性和耐磨性,随实验温度升高,Cu基摩擦材料试样中Cu氧化产物为Cu2O,Fe从Fe2O3转变为Fe3O4,金属氧化膜厚度逐渐增加;Fe以小尺寸、均匀分布于Cu基体时,更有利于提高Cu基体整体的抗氧化性能,在350~450℃可形成稳定的氧化膜降低粘着磨损,展现出了较好的高温耐磨性能;而Fe以较大尺寸分布在Cu基体中时,则使Cu基体出现氧化不均匀现象,不利于高温耐磨性能的提高。

High-temperature Oxidation Behavior and Wear Resistance of Copper-based Composites with Reinforcers of C,ZrSiO4 and Fe

Composites of Cu matrix with reinforcers of graphite,ZrSiO4 and Fe were prepared via powder metallurgy,then their high temperature oxidation behavior and wear performance were assessed in air at 25,250,350 and 450℃.The results show that the size and distribution of Fe particles in Cu-matrix affect the oxidation resistance and wear resistance of Cu-based friction materials.With the increasing temperature,the formed oxidation product of Cu on the surface of copper-based friction materials is Cu2O,but that of Fe changed from Fe2O3 to Fe3O4,and the thickness of oxide scale increased gradually.When Fe particles of small size distribute uniformly in the Cu-matrix,it is more conducive to improving the overall oxidation resistance of the Cu-matrix,in the range of 350~450℃,the formation of stable oxide scale was beneficial to reduce the adhesive wear,demonstrating better high-temperature wear resistance.However,when the Fe particles in the Cu-matrix were of large size,the phenomenon of heterogeneous oxidation can be observed,which is not conducive to improving the high-temperature wear resistance.