چکیده مقاله
Brake pad specimens were fabricated using powder technology combined with positive molding to investigate the tribological performance of copper free friction materials compared with conventional copper based formulations Six compositions were prepared by varying mica iron oxide MIO and steel fiber contents, alongside one copper reference sample Tribological evaluation was conducted using a pin on disc POD method under controlled braking cycles, while worn surfaces were analyzed via SEM/EDXS to elucidate microstructural mechanisms governing fade–recovery behavior This study examines the fade–recovery behavior, disc temperature response, and worn surface microstructure of low steel brake pads incorporating varying proportions of steel fibers, copper/brass, and MIO Fade and recovery rates %FR and %RR were used as key indicators of performance, with higher values reflecting superior stability Among the tested samples, C9B6 exhibited the highest fade resistance and recovery, attributed to the high thermal conductivity of copper and zinc and the formation of a stable lubricating friction film Increasing MIO content initially improved fade resistance up to 6 wt % M6S9 , but excessive levels reduced stability due to weakened platelet support and premature wear particle detachment Recovery rates generally exceeded fade rates, with M0S15 and M3S12 showing the most favorable values, though excessive MIO 12 wt % caused a marked decline Disc temperature analysis confirmed that copper–brass pads dissipated heat more effectively, while higher MIO content led to elevated temperatures and accelerated degradation of heat sensitive constituents Microstructural observations revealed that steel fibers stabilized wear debris and promoted dense secondary platelets, whereas excessive MIO favored larger, less stable type II platelets Overall, the performance ranking was C9B6 > M6S9 > M3S12 > M0S15 > M9S6 > M12S3, underscoring the importance of balanced composition for optimal tribological behavior
کلیدواژهها
نویسندگان
Milad Kazemi
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran
Ali Mohammad Hadian
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran
شیوه ارجاع
Kazemi, Milad and Mohammad Hadian, Ali,1403,Pin-on-disc for investigating the tribological properties of brake pad friction materials produced by positive molding,25th National Conference on Electrical, Computer and Mechanical Engineering,Shirvan
ارائهشده در
مجموعه مقالات بیست و پنجمین کنفرانس ملی مهندسی برق ،کامپیوتر و مکانیک21 اسفند 1403 · شیروان