Comparative Tribological Properties of Pd-, Pt-, and Zr-Based Bulk Metallic Glasses

Lubricants

Golden Kumar¹  ChandraS. Meduri¹  MehmetZ. Baykara²  MarcoA. Medina²  Anthony Rodriguez²  Ogulcan Acikgoz² 

[1] Department of Mechanical Engineering, The University of Texas at Dallas, Richardson, TX 75080, USA;Department of Mechanical Engineering, University of California Merced, Merced, CA 95343, USA;

关键词: bulk metallic glass;    tribology;    friction;    wear;    surfaces;    roughness;   

DOI  :  10.3390/lubricants8090085

来源: DOAJ

【 摘 要 】

We present a comparative study of the tribological properties of Pd-, Pt-, and Zr-based bulk metallic glasses (BMG-Pd, BMG-Pt, and BMG-Zr, respectively) under unlubricated conditions. In particular, micro-tribometry is utilized with a 52,100 steel ball, showing that BMG-Pt exhibits a significantly higher coefficient of friction (COF) (0.58 ± 0.08) when compared with BMG-Pd (0.30 ± 0.02) and BMG-Zr (0.20 ± 0.03). Topographical roughness on and off wear scars is characterized via atomic force microscopy (AFM), with results that do not correlate with the observed frictional behavior. On the other hand, scanning electron microscopy (SEM) is utilized to reveal contrasting wear mechanisms for the three samples: while BMG-Pd and BMG-Zr exhibit predominantly abrasive wear, there is evidence of adhesive wear on BMG-Pt. Consequently, the occurrence of adhesive wear emerges as a potential mechanism behind the observation of relatively high coefficients of friction on BMG-Pt, suggesting stronger interactions with steel when compared with the other BMG samples.

【 授权许可】

Unknown