This research presents the results of a comparative study to determine the friction and wear behavior of the high-velocity oxygen fuel (HVOF)-sprayed Cr₃C₂-25NiCr-coated brake disc. The friction and wear behavior of Cr₃C₂-25NiCr-coated brake disc (CD) and the sliding against the commercial brake pad were examined on a laboratory-scale disc-pad dynamometer and the findings were compared with those of reference brake disc (UCD). The coating was deposited by means of the HVOF process on a grey cast iron (GCI) substrate. Braking tests were performed according to the SAE-J2430 test standard. The as-sprayed coating was characterized for their microstructure and phase constitution by SEM/EDS and XRD. The results reveal that the coefficient of friction (COF) of CD and UCD varies between 0.42–0.57 and 0.44–0.62, respectively. The Cr₃C₂-25NiCr-coated brake disc was found to have exhibited a comparable COF and lower wear loss to the reference brake disc. The addition of a ceramic phase to the brake disc coating played an important role in reducing the COF to an acceptable range and improving the sliding wear resistance of the brake pair.

中文翻译：

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Cr3C2-25NiCr涂层制动盘的摩擦学行为研究

本研究介绍了一项比较研究的结果，以确定高速氧燃料 (HVOF) 喷涂的 Cr ₃ C ₂ -25NiCr 涂层制动盘的摩擦和磨损行为。_{Cr 3} C ₂的摩擦磨损行为-25NiCr 涂层制动盘 (CD) 和对商用制动片的滑动在实验室规模的盘片测功机上进行了检查，并将结果与​​参考制动盘 (UCD) 的结果进行了比较。涂层通过 HVOF 工艺沉积在灰口铸铁 (GCI) 基材上。制动测试根据 SAE-J2430 测试标准进行。通过 SEM/EDS 和 XRD 表征了喷涂涂层的微观结构和相组成。结果表明，CD 和 UCD 的摩擦系数 (COF) 分别在 0.42-0.57 和 0.44-0.62 之间变化。Cr ₃ C ₂发现 -25NiCr 涂层制动盘与参考制动盘具有可比的 COF 和更低的磨损损失。在制动盘涂层中添加陶瓷相在将 COF 降低到可接受的范围和提高制动副的滑动耐磨性方面发挥了重要作用。