Copper Fiber Reinforced Alkali-activated Slag Composite Friction Materials by Hot-pressing Method

Abstract

As the speeds of trains increase, higher demands are placed on brake materials. In order to overcome the thermal degradation phenomenon of brake pads during high-speed braking, we prepared copper fiber reinforced alkali-activated slag composite(AASC) friction materials by hot-pressing method, using slag as matrix, Na₂SiO₃·9H₂O as alkali excitant, copper fiber as reinforcement, and graphite as friction modifier. The results show that the AASC prepared by hot-pressing method has undergone alkali-activated reaction and has geopolymer amorphous characteristics as the conventional cast molding AASC by XRD analysis. The addition of copper fibers can improve the mechanical strength and toughness of the composites substantially, and the AASC has the highest flexural strength, compressive strength and impact toughness when the volume fraction of copper fibers reaches 25vol%. Toughening mechanisms such as drawing, bridging and crack deflection of copper fibers in composites were analyzed by SEM morphology. Addition of appropriate amount of graphite to AASC can effectively reduce the wear rate and improve the stability of the material friction coefficient. The coefficient of friction also remains stable in the high-speed friction experiments without thermal degradation. Therefore, copper fiber reinforced AASC friction materials prepared by hot-pressing method has good mechanical and friction properties.

Keywords

hot-pressing / alkali-activated slag / copper fiber / mechanical properties / tribological performance

References

[1] Fletcher DI, Corteen J, Wilby A. Rough Surface Rolling Contact Fatigue Crack Stress Intensity Factor Calculation for Modern Rail Steels. Wear, 2024, 540–541: 205 231 J]

[2] Sang H, Zeng J, Wang Q, et al. . Theoretical Study on Wheel Wear Mechanism of High-speed Train Under Different Braking Modes. Wear, 2024, 540–541: 205 262 J]

[3] Sellami A, Elleuch R. Effect of Cast-iron Disc Thickness on the Reliability of Tribological Data from Pin-on-disc Test: Case Study of Brake Friction Materials. Heliyon, 2024, 10(3): e25 345 J]

[4] Shin MW, Cho KH, Lee WK, et al. . Tribological Characteristics of Binder Resins for Brake Friction Materials at Elevated Temperatures. Tribology Letters, 2010, 38(2): 161-8 J]

[5] Faghihnejad A, Zeng H. Fundamentals of Surface Adhesion, Friction, and Lubrication[J]. Polymer Adhesion, Friction, and Lubrication, 2013: 1–57

[6] Xiao X, Yin Y, Bao J, et al. . Review on the Friction and Wear of Brake Materials. Advances in Mechanical Engineering, 2016, 8(5): 1-10 J]

[7] Nosko O, Borrajo-Pelaez R, Hedström P, et al. . Porosity and Shape of Airborne Wear Microparticles Generated by Sliding Contact between A Low-metallic Friction Material and a Cast Iron. Journal of Aerosol Science, 2017, 113: 130-140 J]

[8] Abbasi S, Teimourimanesh S, Vernersson T, et al. . Temperature and Thermoelastic Instability at Tread Braking Using Cast Iron Friction Material. Wear, 2014, 314(1–2): 171-180 J]

[9] Wang Y, Zhou YK, Nie HW. Study on the Friction Factor and High-Temperature Friction Resistance of Semi-Metal Frictional Materials. Key Engineering Materials, 2016, 693: 629-637 J]

[10] Xu Y, Wang X, Bai J, et al. . Performances and Failure Mechanism of Semi-metallic Friction Materials Doping Rare Earths. Journal of Rare Earths, 2010, 28: 464-468 J]

[11] Gomes J, Silva O, Silva C, et al. . The Effect of Sliding Speed and Temperature on the Tribological Behaviour of Carbon-carbon Composites. Wear, 2001, 249(3–4): 240-245 J]

[12] Kumar P, Srivastava VK. Tribological Behaviour of C/C-SiC Composites-A Review. Journal of Advanced Ceramics, 2016, 5(1): 1-12 J]

[13] Cai P, Wang Y, Wang T, et al. . Effect of Resins on Thermal, Mechanical and Tribological Properties of Friction Materials. Tribology International, 2015, 87: 1-10 J]

[14] Yao PP, Xiao YL, Deng JW. Study on Space Copper-Based Powder Metallurgy Friction Material and its Tribological Properties. Advanced Materials Research, 2011, 284–286: 479-87 J]

[15] Shoaei P, Ghassemi P, Ameri F, et al. . Comparative Study on the Effect of Fiber Type and Content on the Fire Resistance of Alkali-activated Slag Composites. Construction and Building Materials, 2021, 288: 123 136 J]

[16] Lao JC, Huang BT, Fang Y, et al. . Strain-hardening Alkali-activated Fly Ash/slag Composites With Ultra-high Compressive Strength and Ultra-high Tensile Ductility. Cement and Concrete Research, 2023, 165: 107 075 J]

[17] Liu F, Zheng M, Ye Y. Formulation and Properties of a Newly Developed Powder Geopolymer Grouting Material. Construction and Building Materials, 2020, 258: 120 304 J]

[18] Lach M, Kluska B, Janus D, et al. . Effect of Fiber Reinforcement on the Compression and Flexural Strength of Fiber-Reinforced Geopolymers. Applied Sciences, 2021, 11(21): 10 443 J]

[19] Siciliano UCCS, Zhao J, Constâncio TAC, et al. . Influence of Curing Temperature and Pressure on the Mechanical and Microstructural Development of Metakaolin-based Geopolymers. Construction and Building Materials, 2024, 424: 135 852 J]

[20] Rahier H, Wastiels J, Biesemans M, et al. . Reaction Mechanism, Kinetics and High Temperature Transformations of Geopolymers. Journal of Materials Science, 2006, 42(9): 2 982-2 996 J]

[21] Marvila MT, Azevedo A, Vieira CMF. Reaction Mechanisms of Alkali-activated Materials. Revista IBRACON de Estruturas e Materiais, 2021, 14(3): e14 309 J]

[22] Zhong M, Meng J, Ning B, et al. . Preparation and Alkali Excitation Mechanism of Coal Gangue-iron Ore Tailings Non-sintering Ceramsite. Constr. Build. Mater., 2024, 426: 136 209 J]

[23] Bai T, Liu B, Wu Y, et al. . Mechanical Properties of Metakaolin-based Geopolymer with Glass Fiber Reinforcement and Vibration Preparation. Journal of Non-Crystalline Solids, 2020, 544: 120 173 J]

[24] Sukontasukkul P, Chindaprasirt P, Pongsopha P, et al. . Effect of Fly Ash/Silica Fume Ratio and Curing Condition on Mechanical Properties of Fiber-reinforced Geopolymer. Journal of Sustainable Cement-Based Materials, 2020, 9(4): 218-232 J]

[25] Wang T, Fan X, Gao C, et al. . The Influence of Fiber on the Mechanical Properties of Geopolymer Concrete: A Review. Polymers, 2023, 15(4): 827 J]

[26] Ranjbar N, Zhang M. Fiber-reinforced Geopolymer Composites: A Review. Cement and Concrete Composites, 2020, 107: 103 498 J]

[27] Farhan KZ, Johari MAM, Demirboga R. Impact of Fiber Reinforcements on Properties of Geopolymer Composites: A Review. Journal of Building Engineering, 2021, 44: 102 628 J]

[28] Zhang P, Feng Z, Yuan W, et al. . Effect of PVA Fiber on Properties of Geopolymer Composites: A Comprehensive Review. Journal of Materials Research and Technology, 2024, 29: 4 086-4 101 J]

[29] Bhutta A, Farooq M, Banthia N. Matrix Hybridization Using Waste Fuel Ash and Slag in Alkali-activated Composites and Its Influence on Maturity of Fiber-Matrix Bond. Journal of Cleaner Production, 2018, 177: 857-867 J]

[30] Grance EGO, Paiva MDDM, Junior FGDS, et al. . Geopolymer: A Review of Structure, Applications and Properties of Fiber Reinforced Composites. Research & Development in Material Science, 2018, 7(4): 1-8[J]

[31] Guo G, Lv C, Liu J, et al. . Properties of Fiber-Reinforced One-Part Geopolymers: A Review. Polymers, 2022, 14(16): 3 333 J]

[32] He P, Jia D, Lin T, et al. . Effects of High-temperature Heat Treatment on the Mechanical Properties of Unidirectional Carbon Fiber Reinforced Geopolymer Composites. Ceramics International, 2010, 36(4): 1 447-1 453 J]

[33] Wang S, Xue Q, Ma W, et al. . Experimental Study on Mechanical Properties of Fiber-reinforced and Geopolymer-stabilized Clay Soil. Construction and Building Materials, 2021, 272: 121 914 J]

[34] Wang H, Li H, Yan F. Synthesis and Tribological Behavior of Metakaolinite-based Geopolymer Composites. Materials Letters, 2005, 59(29–30): 3 976-3 981 J]

[35] Ma X, Luan C, Fan S, et al. . Comparison of Braking Behaviors Between Iron- and Copper-based Powder Metallurgy Brake Pads That Used for C/C-SiC Disc. Tribology International, 2021, 154: 106 686 J]

[36] Zhao S, Yan Q, Peng T, et al. . The Braking Behaviors of Cu-Based Powder Metallurgy Brake Pads Mated with C/C-SiC Disk for High-speed Train. Wear, 2020, 448–449: 203 237 J]

[37] Fan ZY, Xiang ZY, Tang B, et al. . Effect of Surface Modification on the Tribological Properties of Friction Blocks in High-Speed Train Brake Systems. Tribology Letters, 2021, 69(1): 27 J]

[38] Li G, Yan Q. Comparison of Friction and Wear Behavior Between C/C, C/C-SiC and Metallic Composite Materials. Tribology Letters, 2015, 60(1): 15 J]

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