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Negative expansion material, and preparation method and application thereof

A technology of negative expansion materials and bulk materials, applied in the field of MnGe-based negative expansion materials, can solve the problems of low electrical/thermal conductivity, low mechanical properties, narrow working temperature range, etc., achieve excellent mechanical properties and overcome poor mechanical properties

Active Publication Date: 2016-06-01
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited NTE coefficient, narrow operating temperature range, low mechanical properties, and low electrical / thermal conductivity properties of these materials, only a few are used in practical applications.
For materials with high thermal expansion coefficients, such as organics, plastics, metals with high PTE, etc. (the PTE of organics and plastics is usually as high as 50-120ppm / K), there are almost no NTE materials available

Method used

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  • Negative expansion material, and preparation method and application thereof
  • Negative expansion material, and preparation method and application thereof
  • Negative expansion material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Preparation chemical formula is MnCoGe 1-x In x (x = 0.005, 0.01, 0.015, 0.020, 0.025), Mn 1-x In x CoGe (x = 0.01, 0.02, 0.025, 0.03) and MnCo 1-x In x Ge x (x = 0.005, 0.01, 0.015, 0.02, 0.03) negative expansion material.

[0050] 1) Weigh the raw materials according to the above chemical formula.

[0051] 2) Put the raw materials prepared in step 1) into the electric arc furnace and vacuumize to 3×10 -3 Pa or above, after cleaning twice with the usual high-purity argon (purity: 99.996% by weight) cleaning method, under the protection of 1 atmosphere of high-purity argon (purity: 99.996% by weight), the arc starts and the melting is repeated 3 times. The melting temperature is 2000°C. After the smelting, it is cooled in a copper crucible to obtain an as-cast alloy ingot.

[0052] 3) Wrap the alloy ingots prepared in step 2) with metal molybdenum sheets, and seal them in a vacuum quartz tube (vacuum degree is 1×10 -4 Pa), after annealing at 875℃ for 6 days, the quartz tube i...

Embodiment 2

[0059] Preparation of Mn 1-x CoGe (x = 0.03, 0.035, 0.045); MnCo 1-x Ge(x=0.01, 0.02; MnCoGe 1-x (x is 0.01, 0.02, 0.03, 0.04, respectively).

[0060] Prepare the material in the same way as in Example 1, except that the chemical formula of the material is Mn 1-x CoGe, MnCo 1-x Ge, MnCoGe 1-x , Where for the component Mn 0.97 CoGe, step 5) adopts two kinds of molding pressures (1152MPa and 845MPa) to compare the influence of different molding pressures on strain during the bonding process.

Embodiment 3-11

[0062] The materials of Examples 3-11 were prepared according to the same method as Example 1, except that the chemical formulas of the materials were as follows:

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Abstract

The invention provides a Mn (Co, Ni) Ge based negative expansion material. The material comprises alloy particles and an adhesive which can bond the alloy particles into a block material. The chemical general formula of the alloy particles is Mn1-xMxCoGe, MnCo1-xMxGe, MnCoGe1-xMx, Mn1-yAyNiGe, MnNi1-yAyGe or MnNiGe1-yAy, wherein M is holes, In, Cr, Ga, Al, P, Cu, Fe, V, Si, Sn or Sb, A is holes, Fe or Sn, x is larger than 0 but smaller than or equal to 0.3, and y is larger than 0 but smaller than or equal to 0.5. The negative expansion behavior of the material is adjustable along with the components and the process parameters, the maximum negative expansion coefficient exceeds most of already reported materials, and the negative expansion material can be used as a material for compensating a high heat expansion coefficient.

Description

Technical field [0001] The invention relates to a Mn(Co, Ni)Ge-based negative expansion material, a preparation method thereof and its application in controlling the thermal expansion of the material. Background technique [0002] Materials with negative expansion coefficient (Negative Thermal Expansion, NTE) have a wide range of practical applications in industry. It is known that most materials have a positive thermal expansion coefficient (Positive Thermal Expansion, PTE), and show positive thermal expansion as the temperature rises. However, in practical applications, materials are often required to have precise thermal expansion or even zero expansion coefficient, such as zero-expansion optical fibers, high-precision optical lenses, zero-expansion printed circuit boards, and mechanical parts with low temperature coefficients. In order to obtain an accurate coefficient of thermal expansion and even achieve zero expansion, it is necessary to develop and discover materials wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/16
Inventor 胡凤霞赵莹莹武荣荣王晶包立夫刘瑶沈斐然匡皓孙继荣沈保根
Owner INST OF PHYSICS - CHINESE ACAD OF SCI