Al-Cu-Fe-B多晶准晶材料的摩擦特性

Friction Behavior of Al-Cu-Fe-B Polycrystalline Quasicrystals

在不同摩擦试验条件下 ,准晶材料Al59Cu2 5 5Fe1 2 5B3与类金刚石 (DLC)涂层在自制的摩擦仪进行了干摩擦试验。研究了温度、摩擦速度、载荷和气氛四种参数对准晶材料摩擦特性的影响 ;采用扫描电镜 (SEM)、X射线衍射仪(XRD)及表面分析仪等对准晶材料的晶体结构、表面形貌和磨屑进行了观察与分析。结果表明 :所有参数均对摩擦系数、表面形貌和表面粗糙度有影响 ,温度的影响尤为显著。随着载荷和摩擦速度的增加 ,摩擦系数减小。准晶材料35 0℃时的磨损机制主要为剥落磨损 ,表面形成了裂纹。此外在 35 0℃时摩擦条件下 。

Dry sliding friction between the polycrystalline Al59Cu25.5Fe12.5B3 quasicrystals (QCs) and the coating of diamond-like carbon (DLC) was carried out by self-made tribometer under different conditions. The influences of four parameters (temperature, sliding velocity, applied load, atmosphere) on friction of quasicrystal surface were studied. Microstructure of the quasicrystal, morphology of worn surface, and wear debris were observed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results show that the friction coefficient and roughness of worn surface for QCs, are influenced by the parameters, especially by temperature. With increasing the applied load and sliding velocity, the friction coefficients decrease. The dominant wear mechanism at 350°C is delamination for QCs. The cracks form on the worn surface during the friction. Moreover, phase transformation is not observed on worn surface of QCs at 350°C.