Ceramic Casting Core with Density Gradient for Aircraft Engine Parts
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Solution Overview
Problem
Precision metal casting cores made of ceramics for aircraft engines require higher mechanical strength and solubility in strong alkaline solutions, but existing porous structures with three-layer densities fail to meet the necessary three-point flexural strength of 40 MPa and efficient alkaline solution permeability.
Innovation Solution
A casting core design featuring a dense surface layer, a dense core, and an intermediate layer with a lower relative density, manufactured using additive manufacturing techniques such as infrared laser melting, allowing for controlled density adjustments and improved solubility through a lattice structure for efficient alkaline solution permeation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous material with three-layer density structure is used, then solubility in strong alkaline solutions is improved, but mechanical strength (three-point flexural strength) becomes insufficient
Solution Approach 1:
The casting core employs a three-layer density structure where each layer has different relative densities: the surface layer has the highest relative density for strength, the intermediate layer has medium density for balance, and the core has the lowest relative density for solubility. This local differentiation allows each region to optimize its function while the whole structure achieves both high strength and good solubility.
2Strength
If the relative density is increased to improve mechanical strength, then three-point flexural strength increases, but solubility in strong alkaline solutions deteriorates
Solution Approach 1:
The casting core employs a three-layer density structure where each layer has different relative densities: the surface layer has the highest relative density for strength, the intermediate layer has medium density for balance, and the core has the lowest relative density for solubility. This local differentiation allows each region to optimize its function while the whole structure achieves both high strength and good solubility.
3Strength
If a dense structure is used, then mechanical strength is improved, but solubility in strong alkaline solutions deteriorates
Solution Approach 1:
The casting core employs a three-layer density structure where each layer has different relative densities: the surface layer has the highest relative density for strength, the intermediate layer has medium density for balance, and the core has the lowest relative density for solubility. This local differentiation allows each region to optimize its function while the whole structure achieves both high strength and good solubility.
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 design enhances mechanical strength and solubility in alkaline solutions, enabling the casting core to withstand long casting processes and be efficiently dissolved, thus improving the manufacturing yield for aircraft engine parts.
Implementation Method 1
the intermediate layer has a lower relative density than the surface layer and the core... so that a strong alkaline solution can easily permeate therethrough
Data Source
AI summary
A casting core containing a ceramic and having sufficient mechanical strength to withstand a casting process over a long period of time and good solubility in alkaline solutions. The casting core includes a core, a surface layer, and an intermediate layer between the core and the surface layer. The intermediate layer has a lower relative density than the surface layer and the core.