成型工艺对多孔PI材料摩擦学及力学性能的影响  

Effect of molding process on tribologyand mechanical properties ofporous PI materials

作　　者：叶锦宗 李锦棒 周宁宁[2] 曹均 卿涛[2] 蒋世宇 于爱兵[1] YE Jin-zong;LI Jin-bang;ZHOU Ning-ning;CAO Jun;QING Tao;JIANG Shi-yu;YU Ai-bing(Faculty of Mechanical Engineering and Mechanics,Ningbo University,Ningbo 315211,Zhejiang,China;Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms,Beijing Institute of Control Engineering,Beijing 100094,China)

机构地区：[1]宁波大学机械工程与力学学院,浙江宁波315211 [2]北京控制工程研究所精密转动和传动机构长寿命技术北京市重点实验室,北京100094

出　　处：《材料工程》2020年第9期144-151,共8页Journal of Materials Engineering

基　　金：宁波市科技创新2025重大专项(2018B10004);国家自然科学基金面上项目(51875294);精密转动和传动机构长寿命技术北京市重点实验室开放基金(BZ0388201803)。

摘　　要：为探索冷压定容烧结成型工艺对多孔聚酰亚胺(PI)材料摩擦性能和力学性能的影响,采用正交实验设计方法,研究了密度、烧结温度、保温时间对多孔PI材料含油性能、摩擦因数、拉伸强度和冲击强度的影响。通过综合考虑甩油后摩擦因数和冲击强度,优化了多孔PI材料的成型工艺。实验结果表明:随着密度的减小,材料表面孔洞增大,内部孔洞支架变稀疏,含油率明显增大,但含油保持率较低,摩擦因数相对较高,拉伸强度和冲击强度显著下降;当烧结温度为350℃时,冲击强度较高;保温60 min即可保证不同密度多孔PI材料的强度;优化制备工艺后,材料含油率为12.0%,离心甩油2 h后摩擦因数为0.092,冲击强度为105.9 kJ/m 2,拉伸强度为74.2 MPa。In order to explore the influence of cold-pressing and constant-volume sintering molding process on the friction and mechanical properties of porous polyimide(PI)materials,the effects of density,sintering temperature and holding time on the oil content,friction coefficient,tensile strength and impact strength of porous PI materials were studied by orthogonal experimental design method.By comprehensively considering the friction coefficient and impact strength after centrifuging oil,the molding process of the porous PI material was optimized.The experimental results show that as the density decreases,the surface holes of the material increase,the internal hole brackets become rarefied,and the oil content significantly increases,but the oil retention becomes lower,the friction coefficient becomes relatively high,the tensile strength and impact strength are significantly reduced.When the sintering temperature is 350℃,the impact strength is high;the strength of porous PI materials with different densities can be guaranteed by holding for 60 minutes.After optimizing the preparation process,the oil content of the material is 12.0%,and the friction coefficient is 0.092 after centrifuging oil for two hours.The impact strength is 105.9 kJ/m 2 and the tensile strength is 74.2 MPa.

关 键 词：多孔PI 成型工艺 含油摩擦 冲击强度 

分 类 号：TH145.4[一般工业技术—材料科学与工程]