含孔隙摩擦材料的冷压制备工艺研究

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1、华东理工大学硕士学位论文第I页含孔隙摩擦材料的冷压制备工艺研究摘要本文研究了含孔隙摩擦材料的冷压制备工艺，研究结果表明:提高树脂的乌洛托品含量、降低酚醛树脂含量、提高多孔人造石墨和石油焦含量、增加丙烯睛纤维含最、延长混料时间、减少热处理预紧力大小和降低夹具卸载温度都能提高摩擦材料的孔隙率;当孔隙率大于10%时，冷压摩擦材料的高温摩擦系数稳定;当孔隙军小于10%时，随着孔隙率降低，高温摩擦系数衰退性增加;对于孔隙率高达28%的无约束摩擦材料和孔隙率高达17%的有约束摩擦材料，依然具有良好的摩擦磨损性能;提高多孔人造石墨、石油焦和丙烯精纤维含量还具有降低高温磨损量的优

2、点。体文还对保温吸油法、真空吸水法和煮沸吸水法等孔隙率测量方法进行了分析和研究，并在此基础上提出减压煮沸吸水法。试验表明:该测量方法是一种准确、易行的摩擦材料孔隙率测量方法。见必~~关键词:摩擦材料;孔隙率夕冷压制备工艺i摩擦磨损性能i双组份酚醛树脂i第II页华东理工大学硕士学位论文ResearchonCold-pressProcessesofPorousFrictionMaterialsAbstractInthepaper,cold-pressprocessesofporousfrictionmaterialsareinvestigated.Itisindica

3、tedthatthehighporosityforfrictionmaterialscanbegainedbymeansofincreasingthecontentsofhexa,porousartificalgraphite,petroleumcokeandpolyacrylonitrilefiber,reducingthecontentofphenolicresin,prolongingmixingtime,decreasingclampingforceincuringtreatmentaswellasloweringthetemperatureatwhich

4、theclampisunloaded.Itisshowedbytestresultsthatfrictioncoefficientofthefrictionmaterialsathightemperatureisstablewhentheporosityisbeyondabout10percent,howeverheatdampingoffrictioncoeficientathightemperaturebecomesevidentalongwiththeporositydecreasingwhentheporosityisbelowabout10percent

5、;thatsatisfactorypropertyoffrictionandwearcanbemaintainedfornonrestraintfrictionmaterialswiththeporosityupto28percentandforrestraintfrictionmaterialswiththeporosityupto17percent;andthatthewearofthefrictionmaterialscanbeloweredbyincreasingthecontentofporousartificalgraphite,petroleumco

6、keandpolyacrylonitrilefiber.Researchisalsocarriedonthemethodofmeasuringtheporosityoffrictionmaterials,suchasmethodsofimbibingoilatcertaintemperature,ofabsorbingwateraftervacuumizingandofabsorbingwaterduringboiling.Onthebases,anewmeasuringmethodofabsorbingwaterduringboilingindecompress

7、ionisputforward,whichisprovedmoreexactandeasierforfrictionmaterialsbytheexperiments.Keywords:frictionmaterialsporositycold-pressprocessthepropertyoffrictionandweartwo-componentphenolicresin作者声明我郑重声明:本人悟守学术道德，崇尚严谨学风。所呈交的学位论文，是本人在导师的指导下，独立进行研究工作所取得的结果。除文中明确注明和引用的内容外，本论文不包含任何他人己经发表或撰写过的内

8、容。论文为