CAJ | 학술논문

为探究硼改性酚醛树脂与丁腈橡胶的质量比（BPF/NBR）对复合摩擦材料力学性能、耐热性能和摩擦磨损性能的影响，采用不同比例的丁腈橡胶和硼改性酚醛树脂作为复合摩擦材料基体，添加碳纤维、钢纤维、石墨、氧化铝粉和沉淀硫酸钡制成复合摩擦材料。对复合摩擦材料的密度、硬度、压缩强度和摩擦磨损性能进行了测试，用变焦距体视显微镜观察磨损表面，并分析其磨损机理。用差分扫描量热仪对摩擦材料进行耐热性分析。结果表明：BPF/NBR质量比对复合摩擦材料的力学性能、耐磨及耐热性影响较大；当硼改性酚醛树脂与丁腈橡胶质量比为6∶1时，复合摩擦材料有最高的密度、硬度和压缩强度，分别为1.933 g/cm3、105 HRL和134 MPa；当硼改性酚醛树脂与丁腈橡胶质量比为5∶1时，摩擦材料的磨损量最小；随着BPF/NBR比例增大，复合摩擦材料表面抗犁削作用增强，黏着转移减弱。利用丁腈橡胶二次改性硼改性酚醛树脂能显著提高硼改性酚醛树脂的耐热性能，且硼改性酚醛树脂与丁腈橡胶的最佳比例介于4∶1和5∶1之间。
위탐구붕개성분철수지여정정상효적질량비（BPF/NBR）대복합마찰재료역학성능、내열성능화마찰마손성능적영향，채용불동비례적정정상효화붕개성분철수지작위복합마찰재료기체，첨가탄섬유、강섬유、석묵、양화려분화침정류산패제성복합마찰재료。대복합마찰재료적밀도、경도、압축강도화마찰마손성능진행료측시，용변초거체시현미경관찰마손표면，병분석기마손궤리。용차분소묘량열의대마찰재료진행내열성분석。결과표명：BPF/NBR질량비대복합마찰재료적역학성능、내마급내열성영향교대；당붕개성분철수지여정정상효질량비위6∶1시，복합마찰재료유최고적밀도、경도화압축강도，분별위1.933 g/cm3、105 HRL화134 MPa；당붕개성분철수지여정정상효질량비위5∶1시，마찰재료적마손량최소；수착BPF/NBR비례증대，복합마찰재료표면항리삭작용증강，점착전이감약。이용정정상효이차개성붕개성분철수지능현저제고붕개성분철수지적내열성능，차붕개성분철수지여정정상효적최가비례개우4∶1화5∶1지간。
Phenolic resin, epoxy resin, styrene butadiene rubber and polytetrafluoroethylene can be used as friction material matrix. Due to poor wear resistance, heat resistance and adhesive properties of epoxy resin, styrene butadiene rubber and polytetrafluoroethylene, their applications in friction materials are limited. The advantages of phenolic resin on the heat resistance, adhesive property, mechanical properties, processing properties and lower cost make it become the most commonly used in adhesive base material of composite friction material. However, the pure phenolic resins are brittle, poor toughness, high hardness, poor heat resistance, low strength and large noise during using stage, so modification is an effective method to improve the comprehensive performance. The effects of different ratio of boron modified phenolic resin (BPF) and nitrile butadiene rubber (NBR) on mechanical properties, thermal stability, friction and wear properties of the friction material were investigated. Filled with carbon fibers, steel fibers, graphite particles, Al2O3 particles and deposit BaSO4 particles, the friction material was prepared with different ratios of boron modified phenolic resin with NBR, which was used as the matrix material. The friction material was formed by die pressing in the temperature of 160℃ and in the load of 10 MPa. The density of the friction material was tested by DH-300 electronic densimeter, the hardness of the friction material was tested by XHR-150 plastic Rockwell hardness tester, the compression strength of the friction material was tested by CSS-44100 electronic universal material testing machine, and the friction and wear properties of the friction material was tested by M-2000A friction and wear testing machine in the loads of 100, 150 and 200 N. The thermal stability of the friction material was analyzed by SMZ1000 zoom stereo microscope. The results showed that the BPF/NBR ratio affected the mechanical properties, wear resistance and heat resistance of the friction material considerably. When BPF/NBR ratio was 6:1, the friction material has the highest density, hardness and compression strength,which are 1.933 g/cm3、105 HRL and 134 MPa respectively . When BPF/NBR ratio was 5:1, the friction material has the least wear lost. With the increasing of BPF/NBR ratio, the plowing resistance of the friction material was enhanced and the adhesive transfer was weakened. The thermal stability of the BPF was enhanced when modified again by NBR, and the best ratio was between 4:1 and 5:1.