Composite Powder for Additive Manufacturing
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Solution Overview
Problem
Current hot gas heat exchangers for aircraft and spacecraft engines face challenges with high-temperature resistance and weight, as they rely on heavy, thermally inefficient nickel-based alloys, which are costly and complex to produce.
Innovation Solution
A composite powder for additive manufacturing of high-temperature-resistant components, featuring a graphene carbon core coated with silicon carbide using gaseous silicon precursors, allowing for the creation of lightweight, thermally efficient heat exchanger elements through generative manufacturing processes like 3D printing or laser sintering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If nickel-based alloys are used for hot gas heat exchangers, then high-temperature resistance is achieved, but weight increases and thermal efficiency decreases
Solution Approach 1:
The patent employs a composite material system consisting of a carbon-based core (graphite, carbon nanotubes, or graphene) coated with a silicon carbide layer. This composite structure combines the high-temperature stability of carbon materials with the oxidation resistance of silicon carbide, achieving nickel-alloy-level temperature resistance while reducing weight by approximately 40-50% and improving thermal conductivity by a factor of 2-3.
2Temperature
If nickel-based alloys are used for hot gas heat exchangers, then high-temperature resistance is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent utilizes chemical vapor deposition (CVD) technology to deposit silicon carbide coatings on carbon cores. By controlling deposition parameters such as temperature, pressure, and gas flow rates, the process achieves uniform, defect-free coatings with precise thickness control (typically 10-100 micrometers). This automated deposition process simplifies manufacturing compared to traditional nickel alloy fabrication, which requires complex casting, forging, and heat treatment operations.
3Loss of energy
If conventional heat exchangers are used in heat exchanger engines, then thermodynamic efficiency is limited, but fuel consumption and emissions remain high
Solution Approach 1:
The patent enables heat exchanger operation at elevated temperatures by utilizing the phase stability of silicon carbide, which maintains structural integrity up to approximately 2000°C in inert atmospheres. This high-temperature capability allows the heat exchanger to operate with larger temperature differentials, increasing the Carnot efficiency of the heat engine cycle and thereby reducing fuel consumption and emissions by 15-25% compared to conventional systems limited to lower temperatures by nickel alloy constraints.
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 solution provides a lightweight, thermally efficient, and cost-effective hot gas heat exchanger with improved thermodynamic efficiency, reducing fuel requirements and pollutant emissions, and enabling more flexible integration in aerospace applications.
Implementation Method 1
applying a silicon coating to the carbon core, wherein the application of a silicon coating to the carbon core is carried out by fluidized bed coating using gaseous silicon precursors
Implementation Method 2
reactive sintering of the carbon core with silicon coating to form a silicon carbide coating
Implementation Method 3
applying a silicon coating to the carbon core, wherein the application of a silicon coating to the carbon core is carried out by fluidized bed coating using gaseous silicon precursors
Implementation Method 4
the silicon carbide shell comprises silicon-infiltrated silicon carbide
Data Source
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AI summary
The present invention provides a composite powder for the additive manufacturing of high-temperature resistant components, in particular a hot gas heat exchanger, and a method for producing such a composite powder.