Development Of Friction Materials Matched With Bionic Non-smooth Structure Brake Disc

Friction materials, which are the key part of brakes, clutches and friction gearings ofautomobile, high-speed railway and agricultural machinery, et al., directly relate to the thereliability and stability of the vehicle. Developed the friction materials with bettercomprehensive performances have an important significance and practical value to improvethe overall level of ground machinery in our country. With the high-speed development ofChina’s modernization construction, the demand for the car continues to rise year over year.However, the present domestic research for friction material is far behind the developedcountries, and it also focuses on the study of brake friction materials on light duty vehiclesand not in heavy duty truck.Early research had shown that heavy duty truck brake disc surface with bionicnonsmooth structure can significantly reduce bionic disk surface scratch and the resistanceto abrasion advances18.7%~50.5%. But at the same time, damage of braking frictionmaterial is serious and wear mass loss increase by4.0-15.3times. Those will greatly reducesafety and reliability of automobile running. On the base of the present situation of frictionmaterial and the early researches, the present study makes a preliminary research of thefriction and wear properties of friction material with bionic non-smooth structure. On theother hand, on the basis of bionic coupling principle, the present study formula compositionof the three reinforcing fiber of friction materials by the golden section method and theorthogonal experiment, and then system analyses the mechanical and physical properties,friction stability, wear resistance and wear mechanism of friction materials by the theory offuzzy comprehensive evaluation method and the relevance theory. We select three kinds ofbrake friction materials with different comprehensive performance after considered thecomprehensive evaluation value and the mechanical and physical properties of frictionmaterials, and then study the match performance of brake disc with the bionic non-smoothstructure and above friction materials along with purchased friction material. Troughpresent research, we obtained a new friction material which has better matchingperformance with the bionic brake disc than that of purchased friction material. The mainresearch contents and conclusions of this study are as follows: Preliminary researched of the friction and wear properties of friction material withbionic non-smooth structure show that the existence of the bionic non-smooth structure canimprove the tribological performance of friction materials and its wear resistance.Three reinforcing fibers of friction materials are optimized by the golden sectionmethod, and fabricate9kinds of friction materials, and then system analyzes thetribological performances of friction materials by the theory of fuzzy comprehensiveevaluation method and the relevance theory. The research results show that frictioncoefficient of friction materials increases with the increase of test temperature, and appeardifferent levels of heat recession. Compared with other specimens, specimen FM5(12.36wt.%glass fiber,12.36wt.%rock cotton fiber and7.64wt.%steel fiber), specimen FM7(7.64wt.%glass fiber,20wt.%rock cotton fiber and7.64wt.%steel fiber) and specimenFM9(7.64wt.%glass fiber,7.64wt.%rock cotton fiber and12.36wt.%steel fiber) havegood performance of heat fading resistance and excellent recovery performance. SpecimenFM7has a lower wear rate and its worn surface is relatively smooth, meanwhile, there issome friction film in the local area. It means there is a good hybrid effect between threekinds of reinforced fibers, which could improve the wear resistance property of frictionmaterial. This study could provide the reference value for the formulation of reinforcedfibers of friction materials.The match performance of the bionic brake disc and three optimized friction materialsalong with purchased friction material is studied. The results showed that specimen FC2(12.36wt.%glass fiber,7.64wt.%rock cotton fiber and20wt.%steel fiber) can matchwith three bionic non-smooth structure brake disc, and the dot brake disc can match withthe above four kinds of friction material. Finally, we obtained a new friction material whichhas better matching performance with the bionic brake disc than that of purchased frictionmaterial, and which also can reduce the damage for brake disc. Those can provide thetheoretical support and practical reference for developing the friction materials which cangood match with bionic brake disc with preferable wear-resisting property.