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Negative thermal expansion material, composite material, and method for producing negative thermal expansion material
US11970396B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11970396-B2 |
| Application number | US-201916976041-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 26, 2019 |
| Priority date | Feb 27, 2018 |
| Publication date | Apr 30, 2024 |
| Grant date | Apr 30, 2024 |
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Abstract
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A negative thermal expansion material having a negative thermal expansion coefficient according to the present invention is represented by Zr 2−a M a S x P 2 O 12+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.
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The invention claimed is: 1. A negative thermal expansion material having a negative thermal expansion coefficient and represented by Zr 2−a M a S x P 2 O 12+δ , wherein M is Sn; a is 0<a≤1; x is 0.4≤x≤1; and δ is a value defined so as to satisfy a charge neutral condition. 2. The negative thermal expansion material according to claim 1 , wherein x is 0.4≤x≤0.48. 3. A composite material comprising the negative thermal expansion material according to claim 2 and a metal material having a positive thermal expansion coefficient. 4. A composite material comprising the negative thermal expansion material according to claim 1 and a material having a positive thermal expansion coefficient. 5. A negative thermal expansion material having a negative thermal expansion coefficient and represented by Zr 2−a M a S x P 2 O 12+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 so as to satisfy a charge neutral condition, wherein part of S site is substituted by Mo or W. 6. A negative thermal expansion material comprising: a composite material represented by Zr 2−a M a S x P 2 O 12+δ where M is at least one selected from Ti, Ce, Sn, and Mn; a is 0≤a≤2; x is 0.48≤x≤0.9 and δ is a value defined so as to satisfy a charge neutral condition, wherein the composite material has a negative thermal expansion coefficient. 7. The negative thermal expansion material according to claim 6 , wherein an absolute value of volume expansion coefficient of the negative thermal expansion material at a temperature of 100 to 180° C. is larger than an absolute value of volume expansion coefficient of the negative thermal expansion material at a temperature of larger than 180° C. 8. A composite material comprising the negative thermal expansion material according to claim 6 and a resin material having a positive thermal expansion coefficient. 9. A method for producing the negative thermal expansion material of claim 8 , comprising: a step of hydrothermally treating a mixture containing zirconium oxychloride octahydrate, ammonium phosphate, sulfuric acid and an additive containing element M at a temperature of 130° C. or more, and a step of baking the mixture hydrothermally treated, at a temperature of 450° C. or more to form the negative thermal expansion material. 10. The method for producing the negative thermal expansion material according to claim 9 , wherein the value of x is controlled by controlling a temperature for baking the mixture hydrothermally treated. 11. The method for producing the negative thermal expansion material according to claim 9 , wherein the temperature for the hydrothermal treatment is 180° C. or more. 12. The method for producing the negative thermal expansion material according to claim 9 , wherein the temperature for baking the mixture hydrothermally treated is 450° C. or more to 900° C. or less.
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- What does patent US11970396B2 cover?
- A negative thermal expansion material having a negative thermal expansion coefficient according to the present invention is represented by Zr 2−a M a S x P 2 O 12+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 negati…
- Who is the assignee on this patent?
- Tokyo Inst Tech, Mitsui Mining & Smelting Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C01B25/45. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 30 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).