Deformation as a Measure of the Ability of Polytetrafluoroethylene towards Product Forming in Solid Phase Processing
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NOLOGY OF POLYMERIC AND COMPOSITE MATERIALS
Deformation as a Measure of the Ability of Polytetrafluoroethylene towards Product Forming in Solid Phase Processing P. M. Bazhina, A. M. Stolina, *, and V. M. Buznikb aMerzhanov
Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia b All-Russian Scientific Research Institute of Aviation Materials, Moscow, 105005 Russia *e-mail: [email protected] Received August 9, 2018; revised September 12, 2018; accepted October 19, 2018
Abstract—The results of experimental studies into the regularities of the plastic deformation of F-4 polytetrafluoroethylene under free compression depending on the pressure and temperature of heating of the primary blank are given; their influence on the structural changes in the deformed material is shown. It is estimated that the moldability of F-4 polymer samples is observed starting from the heating temperature range of 60–100°C and compacting pressure of 1–1.5 MPa. A further increase in pressure and temperature does not lead to any significant enhancement of the moldability of the material. Keywords: molding, moldability, solid phase technologies, polytetrafluoroethylene, deformation, solid phase DOI: 10.1134/S004057952004003X
INTRODUCTION Polytetrafluoroethylene and composites based on it are actively and widely used in the different fields: medicine, atomic industry, aerospace technics, power engineering, construction, mechanical engineering, etc., due to its unique physical, chemical, and mechanical properties [1]. Several limitations exist in the traditional methods of polytetrafluoroethylene processing; in particular, energy-consuming technological operations requiring a temperature that is higher than the melting temperature (about 327°C) are used. Certain principal problems related to the heterogeneous space-time distribution of temperature emerge. The duration of these operations limits the overall performance of the processing equipment [2–4]. Therefore, the development of alternative ecologically safe and resource-saving technological processes of the solid phase technology that are free from the mentioned drawbacks is important. The general specific feature of these methods is that the initial components and the final products exist in the solid state; it allows directly obtaining the products of the desired shape and sizes from the powder materials or preliminarily formed solid blanks. Solid phase technologies are used to solve the problems of obtaining the products from materials characterized by the enhanced qualitative indicators due to the progress of plastic deformation of the material (close die forging, sheetmetal stamping, solid phase and hydrostatic extrusion, pressing, rolling, etc.) [5, 6].
The experimental studies of the regularities of the formation of F-4 polytetrafluoroethylene were performed in this research; the dependences of the deformation degree on the pressure and heating temperature of a blank were estimated and their influence o
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