CF/PI/PEEK Composite for Marine Kinematic Pairs
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Solution Overview
Problem
Existing polymer materials used in marine engineering equipment, such as PEEK and CF modified PEEK, exhibit poor tribological performance under heavy loads and long-term high-speed operation, failing to meet the requirements for kinematic pairs in marine engineering equipment.
Innovation Solution
A friction-reducing and anti-wear composite material is developed by combining PEEK as a matrix material with high-strength chopped carbon fibers (CF) and polyimide (PI) through a hot pressing process, optimizing the synergistic effect for enhanced friction reduction and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If single-polymer material or CF modified PEEK composite material is used, then load-bearing performance or self-lubricating properties are improved, but tribological performance under heavy load deteriorates
Solution Approach 1:
The patent employs a composite material system comprising PEEK matrix, polyimide (PI) filler, and carbon fiber (CF) reinforcement. This multi-component composite structure combines the load-bearing capability of PEEK with the self-lubricating properties of PI and CF, achieving synergistic improvement in both strength and tribological performance under heavy load conditions.
Solution Approach 2:
The patent optimizes the weight ratios of PEEK, PI, and CF to achieve optimal tribological performance. By adjusting the composition parameters (specific ratios of matrix material to filler and reinforcement), the material achieves balanced load-bearing capacity and friction reduction, resolving the contradiction between strength and reliability.
2Strength
If polyimide PI-3 (P84) is used, then load-bearing capacity and abrasion resistance are improved, but friction reduction under seawater conditions deteriorates
Solution Approach 1:
The patent creates a composite where polyimide (PI) serves as a filler within a PEEK matrix, combined with carbon fiber reinforcement. This composite structure allows the material to maintain the load-bearing capacity of PI while incorporating the superior friction reduction properties of PEEK and CF, particularly under seawater lubrication conditions.
Solution Approach 2:
The patent distributes PI filler particles within the PEEK matrix at optimized concentrations (10-27 parts by weight per 70 parts PEEK). This local distribution of PI provides abrasion resistance where needed, while the PEEK matrix and CF reinforcement maintain overall friction reduction capabilities in the seawater environment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The CF/PI/PEEK composite material significantly improves friction reduction and abrasion resistance, offering the highest surface hardness, lowest water absorption, and smallest wear volume loss under seawater conditions, making it suitable for wading kinematic pairs in marine engineering.
Implementation Method 1
the PEEK material, the high-strength chopped fiber and the PI material are mixed followed by hot pressing to prepare the friction-reducing and anti-wear composite material
Implementation Method 2
the PEEK material, the high-strength chopped fiber and the PI material are wet-mixed in a volatile solvent
Implementation Method 3
the PEEK material, the high-strength chopped fiber and the PI material are wet-mixed in a volatile solvent for good interfacial compatibility between the filler and the matrix material
Implementation Method 4
the viscous mixture is dried at 140-160° C. for 3 h to obtain a powder mixture
Implementation Method 5
the mold is preheated to 145-155° C. at a rate of 90-110° C./h; a pressure of 30-40 MPa is applied on the mold; and the temperature is kept at 145-155° C. for 1-2 h
Implementation Method 6
a pressure of 30-40 MPa is applied on the mold; and the temperature is kept at 145-155° C. for 1-2 h
Data Source
AI summary
Disclosed is a friction-reducing and anti-wear composite material for a wading kinematic pair and a method of preparing the same. The friction-reducing and anti-wear composite material is prepared from carbon fiber (CF) among inorganic fillers, polyimide (PI) and polyether ether ketone (PEEK). These three materials are wet-mixed, dried and placed in a mold followed by curing by a heat press. The cured product is cooled and demolded to obtain the CF/PI/PEEK friction-reducing and anti-wear composite material for a wading kinematic pair. Tribological properties of the PEEK material are enhanced due to synergistic effect arising from hybrid organic-inorganic filling. The friction-reducing and anti-wear composite material provided in the invention has significantly reduced friction coefficient and wear volume loss under the seawater environment.