The synergistic effect of carbon materials on properties of copper-based friction materials

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Lin Xueyang ◽  
Liu Rutie ◽  
Wang Lin ◽  
Li Zhengzhou ◽  
Xiong Xiang ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Peer Review ◽  
Petroleum Coke ◽  
Carbon Materials ◽  
Metal Sulfide ◽  
Reduction Process ◽  
Friction Materials ◽  
Content Type ◽  
Braking Process ◽  
Friction Surfaces

Purpose This study aims to investigate the effect of combined use of granular graphite and petroleum coke on the properties of copper-based friction materials and the friction and wear mechanisms. Design/methodology/approach Copper-based friction materials with different proportions of petroleum coke and granular graphite were prepared by using powder metallurgy. The friction surfaces were analyzed. Findings Changing the ratio of petroleum coke/granular graphite affects the formation of oxides and sulfides on the surface of the materials. Increasing the petroleum coke promotes the production of metal sulfide and sulfate in the friction materials and reduces coefficient of friction (COF) and wear. Increasing petroleum coke also increases the amount of carbonic oxide (CO) released during the braking process and promotes the reduction process of iron oxide on the friction surface. Originality/value The synergistic effect of carbon materials on copper-based friction materials was studied in terms of the tribological chemical reaction. This research provides useful information for the selection of carbon materials in friction materials. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-02-2020-0075/

Synergistic effect of Steel Slag-Molybdenum disulfide particles on fade-recovery performances of non-asbestos organic friction material

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sundarrajan D. ◽  
Pitchipoo Pandian ◽  
Manoharan Sembian
Keyword(s):  
Synergistic Effect ◽  
Peer Review ◽  
Molybdenum Disulfide ◽  
Steel Slag ◽  
Friction Material ◽  
Mechanical And Thermal Properties ◽  
Friction Materials ◽  
Content Type ◽  
Brake Pads ◽  
Industrial Standards

Purpose This paper aims to deal with the synergistic effect of steel slag-molybdenum disulfide particles on fade-recovery performances of non-asbestos organic friction material. Design/methodology/approach The brake friction materials were developed by using steel slag and molybdenum disulfide particles as individual and combination in the formulation. The brake friction materials were developed in the form of standard brake pads as per the industrial practice. The physical, mechanical and thermal properties of the developed brake pads were tested as per the industrial standards. The tribological properties were analyzed using the Chase test as per IS2742-Part-4. Worn surface analysis was done using a scanning electron microscope. Findings The experimental results indicate that the brake pads filled with a combination of steel slag and molybdenum disulfide showed stable friction and less wear rate due to the synergetic nature of abrasive and lubricant. Originality/value This paper explains the influence of steel slag and molybdenum disulfide particles as individual and combined in brake pads formulation to enhance the tribological performance by producing stabilized friction with undulations. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-06-2020-0216/

Temperature dependence of friction coefficient and transfer film formation in organic friction materials containing different abrasive components

2020 ◽  
Vol 72 (4) ◽  
pp. 483-489
Author(s):  
Jin Oh Chung ◽  
Sang Ryul Go ◽  
Hee Bum Choi ◽  
Tae Kwan Son
Keyword(s):  
Temperature Dependence ◽  
Peer Review ◽  
High Performance ◽  
Film Formation ◽  
Friction Material ◽  
Transfer Film ◽  
Friction Coefficients ◽  
Friction Materials ◽  
Content Type ◽  
Friction Temperature

Purpose This paper aims to investigate the temperature dependence of transfer film formation and friction coefficients in NAO friction materials with four different abrasive components, ZrO2, ZrSiO4, Al2O3 and Fe3O4. Design/methodology/approach 8.5% SnS2 was added as a lubricating component to friction materials. Friction tests comprised 100 times of consecutive braking application for each friction material under constant temperature of 300°C, 400°C, 500°C and 600°C. After the friction tests, the friction surfaces of the counterpart disks were examined by scanning electron microscope to access the formation of transfer film. Findings Coefficients of friction depended on not only friction temperature but also friction history which is related to development of transfer film. The effect of the transfer film formation was to reduce the friction coefficients for most friction materials. Quantities of the transfer film formation varied with friction materials; at low temperature below 400° the transfer film formation was most active in the Fe3O4 materials, while at 600° it was the most active in the Al2O3 material. The effect of the lubricating component SnS2 was to suppress the formation of transfer film, thus enhancing friction coefficients. Social implications The enhancement of friction coefficients with addition of small amount of lubricating components such as SnS2 is expected to open a new approach in developing high performance-brake pads. Originality/value Temperature was the controlling parameter in the present test. Under these test modes, transfer film could be fully developed to access the role of the transfer film. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-10-2019-0427/

Influence of premixed dual metal sulfides on the tribological performance of copper-free brake friction materials

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Vijay R. ◽  
Manoharan S. ◽  
Nagarajan S. ◽  
Lenin Singaravelu D.
Keyword(s):  
Thermal Stability ◽  
Peer Review ◽  
Tribological Performance ◽  
Metal Sulfides ◽  
Mechanical And Thermal Properties ◽  
Friction Materials ◽  
Content Type ◽  
Good Thermal Stability ◽  
Brake Pads ◽  
Dual Metal

Purpose The purpose of this study is to deals with the effect of premixed dual metal sulfides (tin disulfide + iron disulfide) as a replacement for antimony trisulfide on the tribological performance of brake friction materials. Design/methodology/approach In this study, brake friction materials were developed by using premixed dual metal sulfides as a replacement for antimony trisulfide in the formulation. The brake friction materials were developed in the form of standard brake pads as per the industrial practice. Thermal stability was measured for varying ingredients and developed brake pads using thermogravimetric analysis. The physical, mechanical and thermal properties of the developed brake pads were tested as per the industrial standards. The tribological properties were analyzed using the Chase test as per SAE J661. Worn surface analysis was done using a scanning electron microscope. Findings The experimental results indicate that the brake pads filled with premixed dual metal sulfides had good thermal stability, physical, chemical and mechanical properties with stable friction and less wear rate due to better lubrication preventing friction undulations. Originality/value This paper explains the influence of premixed dual metal sulfides as a replacement for antimony trisulfide in brake pads formulation to enhance the tribological performance by preventing friction undulations. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-04-2020-0144/

Multi-metal sulfide pre-blend combination on the tribological performance of the brake friction material

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sathickbasha K. ◽  
Selvakumar A.S. ◽  
Surya Rajan Balachandran ◽  
Hariharasakthisudhan P.
Keyword(s):  
Peer Review ◽  
Test Procedure ◽  
Metal Sulfide ◽  
Solid Lubricants ◽  
Tribological Performance ◽  
Maximum Temperature ◽  
Brake Pad ◽  
Wear Performance ◽  
Content Type ◽  
Brake Pads

Purpose The purpose of this study is the influence of various combinations of metal sulfides on the tribological performance of brake pads. Design/methodology/approach Three brake pads were prepared using the possible combination of any two of the solid lubricants from Bismuth trisulfide (Bi2S3); Tin disulfide (SnS2) and Antimony trisulfide (Sb2S3) are chosen and blended with molybdenum disulfide and graphite. The tribological performance was compared with the brake pad containing aftermarket sulfide mixture. The tribological performance parameters such as performance coefficient of friction, fade percent, recovery percent, wear thickness loss, time is taken to reach the maximum temperature and fluctuation of friction were investigated using Chase tribometer adopting IS 2742 Part-4 (1994) test procedure. Findings The friction stability of the brake pad with 4Wt% of MoS2, Bi2S3 and SnS2 was observed to be better, but it showed poor wear performance and aggressive towards the rotor, whereas the brake pad contained 4Wt% of MoS2, Bi2S3 and Sb2S3 exhibited improved wear performance. Originality/value This paper explains the influence of the combination of multiple metal sulfide in the tribological performance of the copper-free brake friction composite. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0249/

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