Negative Thermal Expansion Material Cost Reduction
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Solution Overview
Problem
Existing negative thermal expansion materials often contain precious metals, leading to high costs and densities, which have not been effectively reduced in previous technologies.
Innovation Solution
A negative thermal expansion material represented by Zr2−aMaSxP2O12+δ, where M is selected from Ti, Ce, Sn, Mn, Hf, Ir, Pb, Pd, and Cr, with a=0≤a<2, x=0.4≤x≤1, and δ satisfying a charge neutral condition, is produced through hydrothermal treatment and baking processes, resulting in a composite material with reduced cost and density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional negative thermal expansion materials containing precious metals are used, then the negative thermal expansion coefficient is achieved, but the cost and density increase
Solution Approach 1:
The patent changes the chemical composition parameters by substituting precious metals (W, Mo) with abundant, low-density metals (Ti, V, Nb, Ta) in the Zr2MxP2O12-δ material system. This parameter substitution maintains the negative thermal expansion coefficient while reducing both cost and density, directly resolving the contradiction between achieving negative thermal expansion and minimizing material cost/density
Solution Approach 2:
The patent replaces expensive precious metals with abundant, inexpensive metals (Ti, V, Nb, Ta) that are readily available. This substitution uses cheap materials to achieve the same functional effect (negative thermal expansion), thereby reducing material cost while maintaining the required thermal expansion properties
2Reliability
If conventional negative thermal expansion materials containing precious metals are used, then the negative thermal expansion coefficient is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent modifies the compositional parameters by replacing precious metals with abundant metals (Ti, V, Nb, Ta) in the Zr2MxP2O12-δ system. This parameter change maintains the negative thermal expansion coefficient while significantly reducing material cost, directly addressing the contradiction between achieving negative thermal expansion and minimizing manufacturing cost
Solution Approach 2:
The patent employs inexpensive, abundant metals (Ti, V, Nb, Ta) instead of expensive precious metals to achieve the negative thermal expansion effect. This use of cheap materials reduces manufacturing cost while maintaining the required functional performance
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 material achieves a significant reduction in cost and density while maintaining a negative thermal expansion coefficient, making it suitable for applications in electronic and optical devices, fuel cells, and sensors by effectively offsetting thermal expansion issues.
Implementation Method 1
a step of hydrothermally treating a mixture containing zirconium oxychloride octahydrate, ammonium phosphate and sulfuric acid at a temperature of 130° C. or more
Implementation Method 2
a step of baking the mixture hydrothermally treated, at a temperature of 450° C. or more to form a material represented by Zr2SxP2O12+δ
Implementation Method 3
a negative thermal expansion material having a negative thermal expansion coefficient... can effectively offset thermal expansion
Data Source
AI summary
A negative thermal expansion material having a negative thermal expansion coefficient according to the present invention is represented by Zr2−aMaSxP2O12+δ, where M is at least one selected from Ti, Ce, Sn, Mn, Hf, Ir, Pb, Pd, and Cr; a is 0≤a<2; x is 0.4≤x≤1; and δ is a value defined as to satisfy a charge neutral condition. The present invention makes it possible to provide a negative thermal expansion material, a composite material and a method for producing a negative thermal expansion material that can realize reduction in cost and density reduction.