Functionally Graded Ni-MMC Matrix for Strength Above 1800°F
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Solution Overview
Problem
Existing nickel-based superalloys lose strength above 1800°F, while refractory elements maintain strength but are expensive and heavy, and other composites lack ductility and toughness for high-temperature applications.
Innovation Solution
A nickel-based alloy in a nickel metal matrix composite (Ni-MMC) with a gradient matrix alloy structure, comprising inner and outer layers, and a manufacturing method that involves sequential foil layering and controlled heating to enhance infiltration and resistance to degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nickel-based superalloys are used for high-temperature applications, then heat and oxidation resistance is improved, but strength is lost above 1800°F
Solution Approach 1:
The patent creates a metal matrix composite by embedding continuous refractory fiber reinforcement (such as molybdenum, tungsten, or niobium fibers) within a nickel-based superalloy matrix. This composite structure allows the material to maintain the heat and oxidation resistance of the nickel superalloy while gaining the high-temperature strength of the refractory fibers, solving the strength loss problem above 1800°F
Solution Approach 2:
The patent applies different material properties to different regions: the nickel-based superalloy matrix provides heat and oxidation resistance, while the embedded refractory fiber reinforcement provides high-temperature strength. This local differentiation of material functions allows the composite to simultaneously achieve both heat resistance and high-temperature strength
2Strength
If refractory elements are used to maintain strength above 2200°F, then strength and creep strength are improved, but weight and cost increase
Solution Approach 1:
The patent uses a composite structure where continuous refractory fibers (providing high-temperature strength) are embedded in a nickel-based superalloy matrix (providing toughness and ductility). This allows the material to achieve refractory-level strength above 2200°F while maintaining a lower overall weight compared to solid refractory alloys, because the nickel matrix is lighter than solid refractory metal
Solution Approach 2:
The patent changes the microstructural parameters by controlling the volume fraction, orientation, and diameter of the refractory fibers within the nickel matrix. By optimizing these parameters, the material achieves the desired strength above 2200°F with minimal refractory content, thereby reducing weight while maintaining performance
3Strength
If refractory elements are used to maintain strength above 2200°F, then strength is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs composite manufacturing techniques such as fiber placement, braiding, or weaving of refractory fibers followed by infiltration with nickel-based superalloy. These established composite manufacturing methods allow for cost-effective production of high-performance materials, avoiding the need for expensive solid refractory alloy processing while achieving superior high-temperature strength
Solution Approach 2:
The patent segments the material into discrete fiber reinforcement elements distributed within the matrix, which can be manufactured using modular composite fabrication processes. This segmentation allows for more efficient manufacturing compared to producing solid refractory alloys, reducing overall manufacturing cost while maintaining the high-temperature strength benefits
4Strength
If ceramic matrix composites are used for high-temperature applications, then strength to higher temperatures is improved, but ductility and toughness are reduced
Solution Approach 1:
The patent reverses the traditional composite concept by using a metallic matrix (nickel-based superalloy) instead of a ceramic matrix, while still incorporating refractory fiber reinforcement. This metal matrix provides inherent ductility and toughness, allowing the composite to maintain these mechanical properties at high temperatures, unlike ceramic matrix composites which are inherently brittle
Solution Approach 2:
The patent changes the matrix material parameter from ceramic to metal (nickel-based superalloy), fundamentally altering the mechanical behavior of the composite. This parameter change enables the material to exhibit ductile and tough characteristics while still maintaining high-temperature strength through the refractory fiber reinforcement
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 Ni-MMC provides improved strength, creep resistance, and ductility for applications up to 2200°F, offering a cost-effective alternative to conventional nickel superalloys.
Implementation Method 1
The inner layer is solute rich, which improves the ability of the matrix to infiltrate into the reinforcement during manufacturing
Implementation Method 2
heating all layers from about 2000° F. to about 2300° F.; wherein the method provides improved resistance of degradation of mechanical properties to the composite
Data Source
AI summary
The present disclosure relates to a nickel-based metal matrix composite and method of manufacturing thereof. The formulations and methods disclosed herein enable the composite to be used in applications up to 2200° F.