Key Applications of PEEK in Turbocompressors

In modern industry, compressors are often called the “heart of industry.” Turbocompressors—especially high-speed centrifugal compressors—are core rotating equipment in petrochemicals, refrigeration and air-conditioning, hydrogen storage, and other critical sectors. As requirements for speed, pressure, and efficiency continue to rise, conventional metallic materials are beginning to encounter new performance limits.

PEEK (polyether ether ketone), often described as the “king of specialty engineering plastics,” combines high-temperature resistance, high strength, self-lubrication, electrical insulation, and dimensional stability, enabling it to play an irreplaceable role in turbocompressors.

PEEK’s use in compressors did not happen overnight. It was first used in discharge limit plates and valve reeds in reciprocating refrigeration compressors, where its lower natural frequency significantly reduced impact noise while improving efficiency. In diaphragm compressors, PEEK valve reeds extended replacement intervals thanks to excellent fatigue and high-temperature resistance. These mature applications laid a solid foundation for PEEK’s entry into the more demanding turbocompressor field.

Pinion shafts in integrally geared centrifugal compressors typically operate at 15,000–70,000 rpm and at temperatures above 200°C, while continuously enduring alternating loads, chemical attack from lubricating oil, and electrostatic-discharge risks. Conventional metal thrust bearings are prone to adhesive wear, surface fatigue spalling, and even electrical erosion caused by shaft voltage; ordinary polymers struggle to meet high-strength, creep resistance, and low-friction requirements simultaneously.

Published patent literature shows that PEEK can be deposited on the base surface of a high-speed centrifugal-compressor thrust bearing to form a series of tilting pads. This upgrades the material from an “auxiliary sealing component” to a “core power-transmission component.”

PEEK is also widely used for sealing rings, piston rings, and thrust washers inside compressors. Comparative studies indicate that PEEK offers the best balance of strength and wear resistance for high-speed, medium-to-high-load service. Filled PTFE is suitable for special applications requiring extremely low wear rates, but its load-carrying capacity is lower than that of PEEK.

PEEK can take on critical duties in turbocompressors because of its unique combination of properties:

Carbon-fiber-reinforced PEEK (CF/PEEK) has been successfully used to manufacture impellers for hydrogen centrifugal compressors. Its specific strength is far higher than that of titanium alloys, allowing impeller tip speeds up to 688 m/s, compared with approximately 350–400 m/s for conventional metallic impellers. These ultrahigh speeds can raise the single-stage pressure ratio from 1.2–1.5 to above 2.5, significantly reducing the number of stages and lowering equipment cost.

As compressor technology continues to evolve, the application envelope of PEEK and its composites is still expanding.

From quieter valve plates to high-speed bearings and ultra-high-speed impellers, the evolution of PEEK in turbo compressors shows what becomes possible when materials science meets practical engineering. When friction, wear, electrical insulation, or weight becomes the performance bottleneck, a well-designed PEEK solution may be the key to breaking through it.