СПОСОБ ИЗГОТОВЛЕНИЯ ИЗДЕЛИЙ ИЗ КОМПОЗИЦИОННЫХ МАТЕРИАЛОВ НА ОСНОВЕ ПОЛИТЕТРАФТОРЭТИЛЕНА

摘要

FIELD: technological processes. ^ SUBSTANCE: invention is related to the field of materials science, in particular, to polymer composite materials (PCM) based on polytetrafluorinethylene (PTFE) and may be used for making parts of metal polymer friction units of different equipment. Technical result is achieved by using energy of ultrasonic vibrations with frequency of 20±3 KHz and vibrations amplitude within the range of 8-12 microns during pressing of composite mixture. At that vibrations continuously affect the pressing puncheon during 2/3 minutes. Preliminarily mixture powders are mixed in the mixer with knives rotation frequency of at least 2800 min-1. Cold pressing of composition is made in closed mould under the pressure of 50±5 MPa. Pressed stock is heated in the furnace up to the temperature of 360±5°C with the rate of 1.5-2.0 degrees/min. Then it is soaked at this temperature for 8/9 min per 1 mm of item wall thickness and cooled down to 327°C with the rate of 0.3-0.4 degrees/min and then from 327°C down to room temperature together with the furnace. ^ EFFECT: improves mechanical and tribotechnical properties of composite material and increases economy of technological process of items production. ^ 2 cl, 2 tbl