Metallic Material Processing for Directional Thermal Expansion Control
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Solution Overview
Problem
Existing materials lack the ability to accurately control, tailor, or achieve a zero coefficient of thermal expansion across one or more axes, limiting their suitability for various applications.
Innovation Solution
A method involving deformation of metallic materials to transform phases, such as martensite, and orienting them to achieve a controlled thermal expansion coefficient within a predetermined range and direction, using techniques like cold rolling, extrusion, and tensile loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional materials are used, then manufacturing is simple, but the coefficient of thermal expansion cannot be accurately controlled or tailored
Solution Approach 1:
The patent applies parameter changes by systematically varying material composition (alloying elements and their concentrations), microstructural parameters (phase distribution, grain size, texture), and processing parameters (deformation temperature, strain rate, heat treatment conditions) to precisely control the coefficient of thermal expansion. This enables tailoring CTE values to match specific application requirements, resolving the contradiction between manufacturing simplicity and thermal expansion control precision.
Solution Approach 2:
The patent employs composite material strategies by creating multi-phase metallic materials with specific phase combinations (e.g., martensite-austenite, precipitate-matrix structures) and controlled phase distributions. These composite microstructures enable independent optimization of mechanical properties and thermal expansion characteristics, achieving precise CTE control while maintaining structural integrity.
2Stability of the object's composition
If materials with zero thermal expansion are developed, then dimensional stability is improved, but material selection and processing become more difficult
Solution Approach 1:
The patent applies local quality by creating spatially varying microstructures with different phase distributions and orientations in different regions of the material. This enables different portions of the material to exhibit different thermal expansion characteristics, with specific regions engineered to provide zero or near-zero CTE while other regions maintain mechanical strength or provide complementary functions.
Solution Approach 2:
The patent employs dynamics by utilizing phase-transforming materials that can dynamically adjust their microstructure in response to thermal loading. The material's phase composition and distribution can change during service to maintain dimensional stability across varying temperature conditions, providing adaptive dimensional control rather than static properties.
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
Enables the production of metallic materials with tailored thermal expansion properties, allowing for customized expansion coefficients and zero expansion across axes, enhancing their applicability in diverse conditions.
Implementation Method 1
transforming, in response to the deforming, at least some of the first phase into a second phase, wherein the second phase comprises martensite
Implementation Method 2
a thermal expansion coefficient in a predetermined range
Implementation Method 3
comprises a negative coefficient of thermal expansion within a predetermined range
Data Source
AI summary
A controlled thermal coefficient product manufacturing system and method is disclosed. The disclosed product relates to the manufacture of metallic material product (MMP) having a thermal expansion coefficient (TEC) in a predetermined range. The disclosed system and method provides for a first material deformation (FMD) of the MMP that comprises at least some of a first material phase (FMP) wherein the FMP comprises martensite randomly oriented and a first thermal expansion coefficient (FTC). In response to the FMD at least some of the FMP is oriented in at least one predetermined orientation. Subsequent to deformation, the MMP comprises a second thermal expansion coefficient (STC) that is within a predetermined range and wherein the thermal expansion of the MMP is in at least one predetermined direction. The MMP may be comprised of a second material phase (SMP) that may or may not transform to the FMP in response to the FMD.