A room temperature wide temperature range giant negative thermal expansion material and its preparation method

A technology of negative thermal expansion material and wide temperature range, applied in the field of negative thermal expansion material, can solve the problem that it is difficult to effectively widen the phase change temperature range

Inactive Publication Date: 2018-10-12
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing research results show that for the MnM’X system, it is difficult to effectively broaden the phase transition temperature range only by means of chemical doping, resulting in few reports on the negative thermal expansion properties of this type of compound.

Method used

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  • A room temperature wide temperature range giant negative thermal expansion material and its preparation method
  • A room temperature wide temperature range giant negative thermal expansion material and its preparation method
  • A room temperature wide temperature range giant negative thermal expansion material and its preparation method

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Effect test

Embodiment 1

[0035] The preparation method of the above-mentioned huge negative thermal expansion material in a wide temperature range at room temperature proposed by the present invention, mixes germanium powder, manganese powder and cobalt powder, grinds, compresses tablets, places in a quartz tube, and evacuates to 1.33×10 -3 Pa, and then sintered after the hydrogen-oxygen flame sealed the tube, the sintering temperature was 925°C, and the sintering time was 3 days, cooled to room temperature with the furnace, taken out, ground, pressed into tablets, placed in a quartz tube, and evacuated to 1.33×10 -3 Pa, and then sintered after the hydrogen-oxygen flame sealed the tube, the sintering temperature was 925°C, the sintering time was 3 days, and the block Mn was obtained by cooling to room temperature with the furnace. 0.98 CoGe; Mn 0.98 CoGe was placed in a quartz tube and evacuated to 1.33×10 -3 Pa, then oxyhydrogen flame seal the tube; will contain Mn 0.98 Place the CoGe quartz tube i...

Embodiment 2

[0037] The preparation method of the above-mentioned huge negative thermal expansion material in a wide temperature range at room temperature proposed by the present invention, mixes germanium powder, manganese powder and cobalt powder, grinds, compresses tablets, places in a quartz tube, and evacuates to 1.33×10 -3 Pa, and then sintered after the hydrogen-oxygen flame sealed the tube, the sintering temperature was 925°C, and the sintering time was 3 days, cooled to room temperature with the furnace, taken out, ground, pressed into tablets, placed in a quartz tube, and evacuated to 1.33×10 -3 Pa, and then sintered after the hydrogen-oxygen flame sealed the tube, the sintering temperature was 925°C, the sintering time was 3 days, and the block Mn was obtained by cooling to room temperature with the furnace. 0.98 CoGe; Mn 0.98 CoGe was placed in a quartz tube and evacuated to 1.33×10 -3 Pa, then oxyhydrogen flame seal the tube; will contain Mn 0.98 Place the CoGe quartz tube i...

Embodiment 3

[0039] The preparation method of the above-mentioned huge negative thermal expansion material in a wide temperature range at room temperature proposed by the present invention, mixes germanium powder, manganese powder and cobalt powder, grinds, compresses tablets, places in a quartz tube, and evacuates to 1.33×10 -3 Pa, and then sintered after the hydrogen-oxygen flame sealed the tube, the sintering temperature was 925°C, and the sintering time was 3 days, cooled to room temperature with the furnace, taken out, ground, pressed into tablets, placed in a quartz tube, and evacuated to 1.33×10 -3 Pa, and then sintered after the hydrogen-oxygen flame sealed the tube, the sintering temperature was 925°C, the sintering time was 3 days, and the block Mn was obtained by cooling to room temperature with the furnace. 0.98 CoGe; the bulk Mn 0.98 CoGe was ground in a mortar to obtain powdery Mn 0.98 CoGe; the powdered Mn 0.98 After mixing CoGe, grinding balls, and absolute ethanol at a w...

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Abstract

The invention discloses a room-temperature wide-temperature-zone giant negative thermal expansion material having the general formula of Mn1-xCoGe, wherein 0<x<=0.04. The invention also discloses a preparation method of the room-temperature wide-temperature-zone giant negative thermal expansion material, wherein the method comprises the steps: firstly, obtaining lump Mn1-xCoGe by a solid state reaction method, followed by, reducing the particle size and introducing the lattice internal stress and defects by a rapid thermal cycle method and the like, so as to broaden a martensitic phase-transformation temperature zone, and finally obtaining the room-temperature wide-temperature-zone giant negative thermal expansion material. The obtained material has extremely excellent negative thermal expansion performance, the properties of some embodiments are better than or close to a giant negative thermal expansion material BiNiO3 system (the BiNiO3 system is a system having most excellent comprehensive performance in giant negative thermal expansion systems, and has relatively wide [delta]T and great negative thermal expansion coefficient but is required to be synthesized under a condition of high pressure), and the preparation process is simpler and more easily available.

Description

technical field [0001] The invention relates to the technical field of negative thermal expansion materials, in particular to a room temperature wide temperature range giant negative thermal expansion material and a preparation method thereof. Background technique [0002] Due to the anharmonic vibration of the crystal lattice, most solid materials will experience the phenomenon of "thermal expansion and contraction" under the condition of constant external pressure. The phenomenon of thermal expansion and contraction has become one of the most common problems faced by many fields such as cryogenic engineering, aerospace, optics, electronics, communication and daily life. For example, in the field of cryogenic engineering, many key components of cryogenic equipment have to experience extreme temperature changes. If the expansion coefficients of the materials in the device cannot be well matched, the performance of the equipment will be greatly affected or even fail; in aeros...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C30/00
CPCC22C1/04C22C28/00C22C30/00
Inventor 林建超童鹏郭新格章魁蔺帅戴建明孙玉平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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