Modified PEEK-based self-lubricating three-layer composite material and forming method thereof

Abstract

The invention discloses a modified PEEK-based self-lubricating three-layer composite material and a forming method thereof. The forming method comprises the following steps: (1) preparation of a substrate: preparing a bimetallic ball powder plate; (2) preparation of pug: a, burdening: measuring raw materials of PEEK resin, an additive and a plastic pug forming agent; b, powder mixing: mixing the PEEK resin and the powder additive into a powder mixture; c, mixing: mixing the plastic pug forming agent, the powder mixture and a liquid additive, and stirring to prepare a uniform mixture; and d, demulsification: adding alcohol into the mixture for demulsification to obtain plastic pug; and (3) forming: paving and rolling the pug on the bimetal ball powder plate, and carrying out drying, intermediate rolling, plasticizing and hot rolling to obtain a three-layer composite plate. According to the preparation method, the working procedure is simple; and by using the stretching network structure of polytetrafluoroethylene in polytetrafluoroethylene emulsion, the PEEK resin and the additive are mixed and demulsified with the polytetrafluoroethylene emulsion to form the pug with high plasticity, and the pug is good in processability and is easily embedded into a copper powder plate in a rolling mode to form extremely strong combination with a copper powder layer.

Description

technical field [0001] The invention relates to the technical field of self-lubricating materials, in particular to a modified PEEK-based self-lubricating three-layer composite material and a forming method thereof. Background technique [0002] Polyetheretherketone (PEEK) is a special engineering plastic with high temperature resistance, acid and alkali resistance, and high strength. It is commonly used in electronics, medical, automobile, machinery manufacturing and other fields. When it is used in the field of mechanical equipment such as gears and bearings, its application is limited by the disadvantages of large friction coefficient, poor anti-wear ability, and difficulty in dissipating frictional heat. In order to ensure the stable performance of PEEK in long-term applications, PEEK is often doped with some polytetrafluoroethylene (PTFE), graphite, molybdenum disulfide (MoS 2 ) Such self-lubricating additives will also add rigid inorganic particles such as titanium di...

AI Technical Summary

Problems solved by technology

[0003] At present, high temperature resistant self-lubricating bearings and their production methods (CN200610047340.5), a three-layer composite self-lubricating material and its continuous production process (CN201911012265.2) and the production process of PEEK coated high-performance sliding bearings (CN200910153447.1) Both adopt extrusion method to make PEEK three-layer composite self-lubricating sheet, but add PTFE, graphite, MoS 2 Such PEEK modified materials have high melt viscosity, which makes extrusion of the material difficult and the melt processing performance is not good.

In addition, when the extruded modified PEEK is coated on the porous copper powder composite board, there is a time difference between the two times before and after, resulting in a temperature difference between the two successive times. Due to the change of process temperature, the PEEK interface has insufficient melting and mutual The problem of poor bonding force between bearing materials will cause inconsistencies in the density, mechanical strength, load capacity, PV value, fatigue strength and dimensional accuracy of the bearing material, resulting in a decline in overall performance

Moreover, in the process of preparing modified PEEK, in order to mix the raw materials evenly, the mixture needs to be granulated multiple times, which requires many equipment and complicated procedures.

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