Friction Disk Manufacturing via Silicon Carbide and Carbon Fiber Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fiber-containing friction layers with higher mass fractions of fibers suffer from burnouts and surface defects during braking processes, leading to increased wear and unacceptable appearance, while lower fiber content results in a relaxed structure with large cracks.
Innovation Solution
A method involving a slip with a specific composition of silicon carbide, phenolic resin, and carbon fibers applied to a green compact in the CFRP state, followed by drying, hardening, and subsequent siliconization to form a friction disk with a fine crack pattern and improved thermal shock resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher mass fractions of fibers are used in the friction layer, then the tribological properties are improved, but fiber burnouts and surface defects occur during braking processes
Solution Approach 1:
The patent applies parameter changes by carefully controlling the mass fraction of carbon fibers within the specific range of 0.1% to 10%, and optimizing the particle size distribution of silicon carbide (50-120 μm average diameter). These parameter optimizations ensure adequate tribological performance while preventing fiber burnout and surface defects during braking operations.
Solution Approach 2:
The patent uses a composite material system consisting of carbon fibers reinforced in a silicon carbide matrix, bound with phenolic resin. This composite structure combines the high friction and heat resistance of carbon fibers with the thermal stability and structural integrity of silicon carbide, achieving reliable tribological properties without fiber burnout.
2Object-affected harmful factors
If lower mass fractions of fibers are used in the friction layer, then fiber burnouts are prevented, but the structure becomes relaxed with large cracks
Solution Approach 1:
The patent optimizes the fiber content parameter to a minimum of 0.1% mass fraction, which is sufficient to prevent the formation of large cracks and maintain structural stability during carbonization and service, while avoiding the fiber burnout problems associated with higher fiber contents.
Solution Approach 2:
The patent employs local quality by creating a fine crack pattern through controlled carbonization rather than allowing random large cracks. The silicon carbide matrix and phenolic resin binder work together to guide crack formation into a fine, controlled pattern that maintains structural integrity without requiring high fiber content.
3Object-affected harmful factors
If the fiber content is optimized to prevent burnouts, then a fine crack pattern is achieved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies preliminary action by incorporating phenolic resin as a binder in the green compact stage, which maintains structural integrity during handling and processing. The resin is then carbonized in a controlled manner to produce the desired fine crack pattern, avoiding the need for complex post-processing steps.
Solution Approach 2:
The patent simplifies the manufacturing process by optimizing the silicon carbide particle size distribution (50-120 μm average diameter) and fiber content parameters, which allow the friction layer to achieve the desired fine crack pattern through standard carbonization processes without requiring additional complex manufacturing steps.
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 method produces friction disks with optimal tribological properties, preventing fiber burnouts and achieving a finely branched crack pattern, along with enhanced thermal shock resistance and reduced wear.
Implementation Method 1
The binders are then carbonized in the moldings obtained by pressing or extrusion
Implementation Method 2
the support body and friction body are infiltrated separately from one another with liquid silicon, whereby this diffuses into the pores and at least partially reacts with at least some of the carbon to form silicon carbide
Implementation Method 3
liquid silicon, whereby this diffuses into the pores and at least partially reacts with at least some of the carbon to form silicon carbide
Implementation Method 4
A method involving a slip with a specific composition of silicon carbide, phenolic resin, and carbon fibers applied to a green compact in the CFRP state, followed by drying, hardening
Data Source
AI summary
The method involves manufacturing a friction layer from a silicon carbide-dross that dissolves additional phenolic resins in a solvent and has a mass fraction of 0.1 to 10 percentage of fibers or fiber bundles from carbon. The friction layer is applied on a carrier body in the form of a cylinder ring in a carbon fiber reinforced plastic-condition, hardened through heating to a temperature of 120 to 280 degree Celsius and subsequently carbonized and silconised. The fibers comprise a length of 1 to 10 millimeter measured in a fiber direction and breadth of 0.1 to 1 millimeter.