Refractory Metal Ceramic Matrix Composites for Oxidation-Resistant Edges
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Solution Overview
Problem
Current carbon-carbon composite materials used in high-velocity vehicles suffer from oxidation-induced ablation and are labor-intensive and expensive to produce, while refractory metals and ceramics face limitations in temperature resistance and brittle failure, necessitating a low-cost, high-strength, and easily fabricated ceramic composite material.
Innovation Solution
An interpenetrating phase composite is fabricated using additively manufactured refractory metal lattices infiltrated with a ceramic matrix through processes like polymer impregnation pyrolysis, reactive melt infiltration, and chemical vapor deposition, forming a lattice structure with alternating laminate layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If carbon-carbon composite materials are used for leading edges, then temperature resistance is improved, but material loss via oxidation occurs
Solution Approach 1:
The patent uses a composite material system consisting of a ceramic matrix (such as silicon carbide, silicon nitride, or boron nitride) combined with a carbon-based reinforcing phase. This composite structure provides both high-temperature resistance from the ceramic matrix and structural integrity from the carbon reinforcement, while the ceramic matrix protects against oxidation that would otherwise consume the carbon components.
2Reliability
If continuous fiber ceramic matrix composites are used, then damage tolerance is improved, but fabrication cost and labor intensity increase
Solution Approach 1:
The patent employs chopped ceramic fibers instead of expensive continuous fibers as the reinforcing phase. While chopped fibers are shorter and require more processing to achieve equivalent reinforcement, they are significantly cheaper and easier to handle, mix, and process. The ceramic matrix composite formulation uses these disposable-like short fibers to achieve adequate mechanical properties at reduced cost and with simplified manufacturing processes.
3Temperature
If refractory metals are used for leading edges, then melting temperature resistance is improved, but density increases
Solution Approach 1:
The patent creates a composite material where the ceramic phase (with high temperature resistance and low density) forms the continuous matrix, while the carbon-based reinforcing phase (which can be tailored for specific mechanical properties) is distributed throughout. This local arrangement allows each phase to contribute its superior properties: the ceramic matrix provides low density and high-temperature stability, while the carbon reinforcement provides structural strength, achieving an optimal balance that neither pure refractory metal nor pure ceramic could provide alone.
4Reliability
If ceramics are used for leading edges, then oxidation resistance is improved, but brittleness increases
Solution Approach 1:
The patent creates a composite material system where a ceramic matrix (such as silicon carbide, silicon nitride, or boron nitride) provides oxidation resistance and high-temperature stability, while a carbon-based reinforcing phase (such as carbon fibers or chopped carbon) provides tensile strength and toughness. The combination creates a material that exhibits both the oxidation resistance of ceramics and the damage tolerance of fiber-reinforced composites, overcoming the inherent brittleness of pure ceramics.
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 a cost-effective, high-temperature-resistant composite with improved mechanical properties, enabling easier and less expensive production of leading edges and control surfaces for high-velocity vehicles.
Implementation Method 1
introducing a matrix material to the reinforcing phase... polymer impregnation pyrolysis
Implementation Method 2
The method includes forming a reinforcing phase by additive manufacturing, depositing a ceramic slurry into the reinforcing phase, and filtering the ceramic slurry
Data Source
AI summary
A method of fabricating a refractory metal ceramic matrix interpenetrating phase harsh environment capable composite is provided. The method includes forming a reinforcing phase by additive manufacturing and introducing a matrix material to the reinforcing phase. The step of introducing the matrix material may be performed by additive manufacturing or a densification process. The reinforcing phase may be a lattice formed of metal or a ceramic, and the matrix material may be a ceramic or a metal. Alternatively, the reinforcing phase formed by additive manufacturing is a laminate layer, and the matrix material introduced to the reinforcing phase is a laminate layer deposited on the reinforcing phase by additive manufacturing in a plurality of alternating layers. A refractory metal ceramic matrix composite is also disclosed. The refractory metal ceramic matrix composite includes a lattice formed by additive manufacturing, and a matrix material deposited in the lattice.