Influence of Isostatic Press on the Pore Properties of Porous Oil-containing Polyimide Retainer

doi:10.3901/JME.2022.16.178

Abstract

Abstract: In order to meet the requirements of isostatic pressing for porous polyimide retainer used in high precision bearing, the forming process of porous polyimide material prepared by isostatic pressing of molding powder is studied. The effect of structural factors and technological factors of cold and hot isostatic press on the pore properties of porous polyimide materials are studied systematically, from the point of view of polyimide structural property, the softness and hardness of package, and hot isostatic pressing process control (temperature, pressure, time). The main densification mechanism of polyimide molding powder in cold isostatic pressing process is particle approaching and rearrangement in the early stage, and shear deformation in the middle and late stage. In the hot isostatic pressing process, the main densification mechanism is shear deformation and plastic deformation under high temperature and high pressure at the same time. The expansion of sealed gas in the pores lead to the enlargement of pore diameter. The results show that the increase of the maximum temperature and holding time of hot isostatic pressing is beneficial to obtain larger pore size, and the effect of cold isostatic pressing process on the pore properties of porous polyimide is more fundamental. This study provides a scientific basis for the subsequent preparation of porous oil-bearing retainer materials by isostatic pressing and the precise regulation of pore properties according to the application conditions.

Key words: polyimide, bearing retainer, cold isostatic press, hot isostatic press, pore property

CLC Number:

TH133

XU Mingkun, GUO Lihe, ZHOU Ningning, WANG Chao, WANG Tingmei, QING Tao, ZHANG Jiyang, TAO Liming, WANG Qihua. Influence of Isostatic Press on the Pore Properties of Porous Oil-containing Polyimide Retainer[J]. Journal of Mechanical Engineering, 2022, 58(16): 178-188.

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