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A kind of negative expansion material and its preparation method and application

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., and achieve the effect of overcoming poor mechanical properties and excellent mechanical properties

Active Publication Date: 2017-08-01
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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  • A kind of negative expansion material and its preparation method and application
  • A kind of negative expansion material and its preparation method and application
  • A kind of negative expansion material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The 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 materials.

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

[0051] 2) Put the raw materials prepared in step 1) into the electric arc furnace respectively, and vacuumize to 3×10 -3 Above Pa, after cleaning twice with the usual high-purity argon (purity 99.996wt%) cleaning method, under the protection of 1 atmospheric pressure of high-purity argon (purity 99.996wt%), the arc is started and the melting is repeated 3 times. The melting temperature is 2000°C. After the smelting is finished, it is cooled in a copper crucible to obtain a cast alloy ingot.

[0052] 3) Wrap the alloy ingots prepared in step 2) with metal molybdenum sheets respectively, and seal them in a vacuum quartz tube (vacuum degree is 1×10 -4 Pa...

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 are 0.01, 0.02, 0.03, 0.04, respectively).

[0060] Prepare the material according to the same method as in Example 1, the difference is 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 Two kinds of molding pressures (1152MPa and 845MPa) were used in CoGe, step 5), and the effects of different molding pressures on strain during the bonding process were compared.

Embodiment 3-11

[0062] Prepare the material of embodiment 3-11 according to the same method as embodiment 1, the difference is that the chemical formula of the material is as follows respectively:

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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, its preparation method and its application in controlling the thermal expansion of the material. Background technique [0002] Materials with negative thermal expansion (NTE) have a wide range of practical applications in industry. It is known that most materials have a positive coefficient of thermal expansion (Positive Thermal Expansion, PTE), showing positive thermal expansion as the temperature rises. However, in practical applications, materials with precise thermal expansion or even zero expansion coefficient are often required, such as: zero-expansion optical fiber, high-precision optical lens, zero-expansion printed circuit board, mechanical parts with low temperature coefficient, etc. In order to obtain accurate thermal expansion coefficient or even achieve zero expansion, it is necessary to develop and discover materials with negative expansion, and to achieve high-pre...

Claims

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Application Information

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Patent Type & Authority Patents(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