Preheating Chamber Layout for One-Step C/C Brake Densification
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Solution Overview
Problem
Existing processes for manufacturing carbon/carbon (C/C) composite friction parts, such as aircraft brake discs, are complex and time-consuming due to the need for multiple stages of densification and the introduction of ceramic phases, which increases costs and facility size.
Innovation Solution
A thermochemical treatment facility with a preheating chamber partitioned into independent gas circulation paths allows for the simultaneous deposition of oxide and/or oxycarbide phases into preforms without removing them from the reaction chamber, simplifying the manufacturing process and reducing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an external chlorinator is used to produce Zr-O-C deposits by CVI, then the preform can be processed directly in the CVI facility, but condensation phenomena occur in the connecting pipes requiring high temperature maintenance and complex sealing valves
Solution Approach 1:
The patent merges the chlorinator and preheating chamber into a single integrated unit located inside the reaction chamber. This eliminates the need for external chlorinators and connecting pipes, thereby preventing condensation issues while reducing facility complexity. The integrated design combines multiple functions (chlorination and preheating) in one compact component.
2Ease of manufacture
If an external chlorinator is used to produce Zr-O-C deposits by CVI, then the preform can be processed directly in the CVI facility, but the overall size of the facility increases
Solution Approach 1:
The patent combines the chlorinator and preheating chamber into a single integrated unit inside the reaction chamber. This merging of functions into one compact component avoids the need for separate external equipment and connecting infrastructure, thereby reducing the overall facility size while maintaining direct processing capability.
3Reliability
If multiple stages of densification and ceramic phase introduction are used to manufacture C/C composite friction parts, then good performance is achieved, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The patent merges the ceramic phase introduction process with the densification process by introducing ceramic-containing gases during the CVI densification stages. This integration allows both densification and ceramic incorporation to occur simultaneously in the same reaction chamber without requiring separate processing stages, thereby maintaining performance while improving manufacturing efficiency.
Solution Approach 2:
The patent enables continuous densification and ceramic phase incorporation in a single uninterrupted CVI process. By introducing ceramic-containing gases during the densification stages, the process maintains continuous useful action without requiring intermediate steps such as discharge, immersion in precursor sol, drying, and separate heat treatment, thereby significantly reducing manufacturing time.
4Adaptability or versatility
If ZrCl4 is used as precursor for CVI deposition, then oxide and oxycarbide deposits can be produced, but condensation phenomena occur in the connecting pipes
Solution Approach 1:
The patent extracts the chlorinator from the external piping system and relocates it inside the reaction chamber as part of an integrated preheating unit. This extraction from the vulnerable piping system eliminates the condensation problem in connecting pipes while maintaining the ability to produce oxide and oxycarbide deposits using ZrCl4 as precursor.
Solution Approach 2:
The patent changes the temperature parameter along the gas path by implementing a preheating chamber that heats the gas before it reaches the reaction chamber. This temperature parameter change prevents condensation of ZrCl4 in the delivery system while maintaining the chemical reactivity needed for oxide and oxycarbide deposit formation.
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 approach simplifies the manufacturing process, reduces production time, and eliminates issues like ZrCl4 condensation, thereby reducing complexity and costs while maintaining performance.
Implementation Method 1
a first gas circulation path between a first gas inlet (1110) and the reaction chamber (140)
Implementation Method 2
the second matrix phase being formed by chemical vapor infiltration from a second gaseous precursor obtained by reaction between a reactive gas introduced into the second compartment (1120) of the preheating chamber (110) and the metal precursor in solid form present in the second compartment (1120)
Implementation Method 3
densification of the fibrous preform(s) by a matrix comprising at least a first phase and a second phase, the first matrix phase being formed by chemical vapor infiltration from a first gaseous precursor introduced into the first compartment (1110) of the preheating chamber (110)
Data Source
AI summary
A thermochemical treatment facility includes a reaction chamber and a preheating chamber including a first compartment defining a first gas circulation path between a first gas inlet and the reaction chamber. The preheating chamber further includes at least one second compartment independent of the first compartment defining a second gas circulation path between a second gas inlet and the reaction chamber, the second compartment containing a solid metal or metalloid precursor present in the second gas circulation path.