多孔聚酰亚胺保持架材料微孔性能的影响因素  

Factors Influencing Microporous Properties of Porous Polyimide Cage Materials

作　　者：时连卫[1,2] 董胤喆 李建星 韩涛[1,2] 张弘毅 SHI Lianwei;DONG Yinzhe;LI Jianxing;HAN Tao;ZHANG Hongyi(Luoyang Bearing Research Institute Co.,Ltd.,Luoyang 471039,China;Henan Key Laboratory of High Performance Bearing Technology,Luoyang 471039,China)

机构地区：[1]洛阳轴承研究所有限公司,河南洛阳471039 [2]河南省高性能轴承技术重点实验室,河南洛阳471039

出　　处：《轴承》2023年第4期45-48,共4页Bearing

基　　金：国家重点研发计划资助项目(2018YFB2000602)。

摘　　要：采用冷压-烧结成型工艺制备多孔聚酰亚胺保持架材料,利用高压孔隙结构仪测试多孔材料微孔参数,研究原材料、聚四氟乙烯含量、压制成型工艺及烧结成型工艺等不同因素对多孔材料微孔性能的影响,结果表明:聚酰亚胺粉粒径减小,材料微孔直径减小,孔隙率增大;聚酰亚胺粉平均分子量增大,材料微孔直径和孔隙率均减小;聚四氟乙烯含量增加,材料微孔直径和孔隙率先增大后减小,当聚四氟乙烯含量为20%时,材料微孔直径和孔隙率达到最大值;单位面积成型压力增大,材料微孔直径、孔隙率急剧减小,成型压力大于20 MPa后减小缓慢;随保温时间增加,材料微孔直径先减小后增大,孔隙率先增大后减小,可选择合适的保温时间,使材料微孔直径及孔隙率达到最佳。The porous polyimide cage materials are prepared by cold pressing and sintering molding processes.The microporous parameters of porous materials are measured by using a high pressure pore structure instrument.The effects of different factors such as raw material,PTFE content,pressing and sintering molding processes on microporous properties of porous materials are studied.The results show that:with the decrease of particle size of polyimide powder,the micropore diameter of materials decreases,and the porosity increases;with the increase of average molecular weight of polyimide powder,the micropore diameter and porosity of materials decrease;with the increase of PTFE content,the micropore diameter and porosity of materials increase first and then decrease,the materials with 20%PTFE having maximum micropore diameter and porosity;with the increase of molding pressure per unit area,the micropore diameter and porosity of materials decrease sharply,and then decrease slowly when the molding pressure is greater than 20 MPa;with the extension of holding time,the micropore diameter of materials decreases first and then increases,and the porosity increases first and then decreases,the appropriate holding time can be selected to optimize the micropore diameter and porosity of materials.

关 键 词：滚动轴承 保持架 聚酰亚胺 微孔材料 孔隙率 

分 类 号：TH133.33[机械工程—机械制造及自动化] TQ323.7[化学工程—合成树脂塑料工业]