Corn Stalk Fiber Reinforced Brake Friction Material And Its Scaled Bench Test

With the rapid progress of the automotive industry,environmental issues arising from automotive brake friction materials are increasingly receiving attention.In the case where asbestos has been banned for brake friction materials,finding a suitable alternative is a problem that the brake pad industry must solve.Before that,steel fibers,copper fibers,glass fibers,aramid fibers,and carbon fibers have been widely used as reinforcement fibers in the production of brake friction materials.However,each of these reinforcing fibers has its own advantages and disadvantages.Jilin Province is a major agricultural province in China,and corn is its main economic crop.At present,there are three major methods for treating corn stalks in Jilin Province and even in the northeast region: the first is the return of straw to the field,the second is the feeding of grass animals,and the third is burning on the spot.None of the three treatment methods can effectively use corn stalks.The development and utilization of corn stalk resources,the use of it as reinforcement material to prepare corn stalk fiber and the strengthening of environmentally friendly automotive friction materials are not only one of the effective ways to solve the problem,but also have a profound impact on the development of ecological agriculture,and even the development of the entire rural economy.Generate meaning.The development of corn stalk fiber to enhance the environment-friendly low-resin automotive friction materials can reduce the environmental problems caused by the use of friction materials and the adverse effects of resource shortages.It also lays a good foundation for further accelerating environmentally friendly friction materials and achieving international advanced technology.basis.The corn stalk fiber was treated in a 1wt.% NaOH solution at a constant temperature water bath at 30°C for 20 min,and then treated with a 30% strength NaCl aqueous solution and a constant temperature water bath at a temperature of 30°C for 12 hours,and then washed with clean water and dried.In the oven at 105 °C thermostatic drying 10 h,it was modified to make the corn straw fiber tensile strength increased by 195.8%,the elastic modulus increased by 14.5%.When the corn stalk fiber content gradually increases,the density of the corn stalk fiber-reinforced friction material will decrease,the density of the non-corn stalk fiber-reinforced friction material is the largest,reaching 2.34 g/cm3,and the friction material density of the corn stalk fiber content reaches 8%.The minimum,2.17 g/cm3,shows that adding corn stover fiber to the friction material has less effect on its density.With the increase of corn stalk fiber content,the hardness of corn fiber reinforced brake friction material gradually decreased,the hardness of non-corn straw fiber reinforced friction material reached a maximum of 124.3 HV,and the friction material hardness of corn stalk fiber content of 8% was the lowest.51.36 HV.The hardness of the friction material added with corn stalk fiber will be reduced,and the reason for the decrease of the hardness of the friction material may be due to insufficient mixing of the corn stalk fiber and other raw material components of the friction material,resulting in a large difference in the local hardness of the friction material.As a result,the overall hardness of the friction material to which the corn stover fiber is added is reduced.Through experiments,it can be seen that the brake friction material added with corn stalk fiber has higher friction coefficient,wear,and thermal decay recovery than the brake friction material without corn stalk fiber added,and the corn stalk fiber content is 6wt.% The performance of the brake friction material(FC-4)is particularly evident in all aspects.A 1:5 electrical analog inertia ratio test bench was designed.It can simulate the conditions generated during the car braking process and can meet all the scenarios required by the SAE J2681 test standard,including initial performance measurement,running-in,cold braking,high-speed braking,high-temperature braking,speed-controlled braking,and Degradation performance test and recovery performance test,etc.,so 1:5 electrical analog inertia ratio test bench has good simulation of experimental conditions.The comparison test was carried out with a 1:1 gantry using a uniform standard brake pad.The experimental results show that the 1:5 ration experiment and the 1:1 rig experiment are fully comparable in the experimental results,and the dynamic trend of the test data is as well.The test results have a high degree of consistency.Therefore,the 1:5 electrical analog inertia ratio test bench has better experimental data consistency than the 1:1 inertial bench.On the 1:5 electric simulation inertia ratio test bench,the real situation of brake friction materials with different contents of corn stalk fiber was simulated.Adding a certain amount of corn stalk fiber to the brake friction material can improve the friction and wear properties of the brake friction material.With the increase of corn stalk fiber content,the friction coefficient of the brake friction material increases,and the wear rate decreases.When the addition amount was 6 wt%(FC-4 sample),both indicators reached the optimum value.When the content of added corn stalk fiber is continuously increased,the friction coefficient of the brake friction material decreases and the wear rate increases.