EXCELLENT PERFORMANCE AT HIGH TEMPERATURES
This product is available in all of Europe
To overcome the above-mentioned limitations, EVONIK FIBRES GmbH is offering Polyimide P84®NT in powder or granulate form, which is processable by employing common sinter technologies such as hot compression moulding or direct forming. The high mechanical stability and the impact resistance of P84®NT parts ensure good machinability with standard tools.
LIFT YOUR PARTS TO THE NEXT LEVEL
Parts made of Polyimide P84®NT are excellent performers in thermally and mechanically stressed applications. This novel material features a high glass transition temperature of 337–364°C and a rigid structure (3705 MPa flexural modulus, 188 MPa strength in a three-point-bending experiment), combined with a high elongation at break of over 11 percent.
HOT COMPRESSION MOULDING
Big semi-finshed parts like plates, rods and tubes are produced by “Hot compression moulding” (HCM), applying high pressure and temperature above the glass transition point (Tg) for some hours. The manufacturing of precise components with high mechanical stability is done by machining these semi-finished parts. Processing parameters are 400kg/cm² pressure and 350-380°C temperature.
If a large quantity of small parts is to be produced cost efficiently and rapidly, Polyimide P84®NT powder can be processed by means of direct forming. This technology includes the production of “green parts” at extremely high pressure and ambient temperatures, with subsequent sintering in an external furnace. Processing is done at 3000kg/cm² pressure and 350-380°C temperature. The sintered parts can be manufactured with a high degree of precision and require little or no machining before they are used. High stroke rates of up to 40 parts per minute are possible.
Given the variability of its properties, the simple processing of the raw material, and the good machinability of parts with standard tools, Polyimide P84®NT is the right choice for applications where plastics are used for commercial or technical reasons and demands on temperature stability are high.
For example, bushings made of a polyimide-graphite compound are used as bearings for windscreen wipers — for a lifetime of oil- and grease-free lubrication. Spacer discs in gear boxes can be made by direct forming, including all the necessary notches, thus minimizing postprocessing and ensuring high-temperature stability and low wear. This new promising material is used in bushings, seals, bearings components, guides, gear wheels, and valve parts in the automotive and aerospace industries and in industrial equipment.
Polyimide P84®NT is available as neat polymer as well as blended with functional fillers. Standard compounds contain 15% or 40% graphite, 15% MoS2 or 15% graphite combined with 10% PTFE. Moreover, developing custom-tailored solutions with proprietary formulations are possible.
- Excellent performance at high temperatures: Polyimide P84®NT is used in applications where ordinary plastics would sooner melt or decompose.
- High heat deflection temperature: Polyimide P84®NT guarantees very good creep resistance even at elevated temperatures.
- High strength and excellent shape stability: Parts and components made of Polyimide P84®NT provide a rigid structure and can bear high mechanical stress and elongation.
- Very good impact resistance: The high impact strength of Polyimide P84®NT ensures easy machinability with standard tools and good quality of edges and surfaces.
- Processing by state-of-the art sinter technologies: Polyimide P84®NT is processable cost-efficiently by common sinter technologies such as hot compression moulding or direct forming.
- Powder or granules are commercially available: Commercially available polyimide raw material enables plastics processors to develop proprietary polyimide parts and compounds.
- Small particle size: Homogenous blending with functional fillers or other polymers can be achieved by employing powder grades with particle size less than 10μm.
- Low wear and friction behaviour: Tribological compounds with solid lubricants provide dry-lubricated solutions for demanding applications.
EVONIK Polyimide P84®NT is a registered trademark of EVONIK FIBRES® GmbH used under license by DOLDER AG.