Ceramic Brake Matrix Pyrolysis Catalyst Bonding
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Solution Overview
Problem
The existing pyrolysis technique for producing ceramic matrix materials for brake friction components requires long processing times due to low heating speeds, which leads to thermal stresses and potential material failures, and cannot directly bond the ceramic matrix material with metal support plates without causing deformations.
Innovation Solution
A method involving a mixture of siliconic ceramic precursors, abrasives, lubricants, and metal materials, with a catalyst for accelerated reticulation during hot-pressing, allowing pyrolysis at temperatures below 800°C, which enables direct bonding of the ceramic matrix material with a metal support plate and reduces processing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low heating speed is used during pyrolysis to limit thermal stresses, then material reliability is improved, but processing time increases significantly
Solution Approach 1:
The patent changes the heating speed parameter during pyrolysis, using higher heating speeds (0.5-5°C/min) compared to conventional methods (0.1-0.5°C/min), while controlling the maximum temperature to remain below 800°C. This parameter change allows faster processing without causing excessive thermal stresses that would compromise material reliability.
Solution Approach 2:
The patent applies preliminary hot-pressing treatment before pyrolysis to densify the green body and reduce porosity. This preliminary action strengthens the material structure in advance, making it more resistant to thermal stresses during subsequent high-speed heating, thus enabling faster processing while maintaining reliability.
2Productivity
If high heating speed is used during pyrolysis to reduce processing time, then productivity is improved, but thermal stresses increase causing material failure
Solution Approach 1:
The patent applies preliminary hot-pressing treatment before pyrolysis to densify the green body and reduce porosity. This preliminary action strengthens the material structure in advance, making it more resistant to thermal stresses during subsequent high-speed heating, thus enabling faster processing while maintaining reliability.
Solution Approach 2:
The patent dynamically adjusts the heating speed during pyrolysis based on the material's state and temperature stage. The heating speed varies between 0.5-5°C/min depending on the specific temperature range and material response, allowing optimized productivity while preventing thermal stress accumulation that would cause failure.
3Quantity of substance
If pyrolysis temperature is increased to above 800°C to complete ceramic transformation, then ceramic yield is improved, but metal support plate deformation occurs
Solution Approach 1:
The patent changes the pyrolysis temperature parameter to remain below 800°C (specifically 600-800°C) rather than exceeding it. This temperature control ensures complete ceramic transformation and sufficient ceramic yield while preventing thermal deformation of the metal support plate, as temperatures above 800°C cause unacceptable deformations.
Solution Approach 2:
The patent creates a composite structure where the ceramic matrix material is intimately mixed with metal particles (steel wool, iron powder, copper powder, brass powder) before hot-pressing. This composite approach allows the ceramic matrix to bond with the metal support plate at lower temperatures, achieving sufficient ceramic transformation without exposing the metal plate to deforming temperatures.
4Quantity of substance
If conventional pyrolysis method is used, then ceramic matrix material is produced, but direct bonding with metal support plate cannot be achieved
Solution Approach 1:
The patent merges the ceramic matrix material production with the metal support plate bonding process into a single integrated operation. Metal particles are mixed with the ceramic precursor and binder before hot-pressing, so that during pyrolysis the ceramic matrix forms and simultaneously bonds with the metal support plate, eliminating the need for separate bonding operations.
Solution Approach 2:
The patent creates a composite structure where the ceramic matrix material is intimately mixed with metal particles before hot-pressing. This composite approach allows the ceramic matrix to bond with the metal support plate at lower temperatures through direct contact and chemical interaction, achieving both ceramic formation and bonding in one process.
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
This method significantly reduces processing time, enhances friction coefficient stability, and improves wear resistance, allowing for direct bonding with metal support plates without deformation, resulting in ceramic matrix materials with superior friction and wear performance compared to traditional materials.
Implementation Method 1
The mixture comprises a catalyst suitable for favouring reticulation of the ceramic precursor during the hot-pressing phase
Implementation Method 2
subject the green body to a process of pyrolysis in order to obtain ceramisation of the preceramic binder
Data Source
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AI summary
Method for making a ceramic matrix material for brake friction components, in particular disc brakes, consisting of the following operational phases: a) prepare a mixture of at least one siliconic type ceramic precursor, particles of hard materials suitable as abrasives, particles of substances suitable as lubricants and particles of metal materials; b) hot-press the mixture to obtain a green body; c) submit the green body to a process of pyrolysis in order to achieve ceramisation of the preceramic binder, thus obtaining a ceramic matrix material. The invention is distinguished by the fact that the mixture includes a catalyst suitable for favouring reticulation of the ceramic precursor during the hot-pressing phase and by the fact that the pyrolysis process is carried out at temperatures below 800°C, more precisely between 400°C and 600°C.