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A kind of perovskite-like structure negative expansion manganese carbon compound preparation method

A perovskite structure, negative expansion technology, applied in the field of negative expansion materials, to achieve the effect of high purity, cheap raw materials, and good thermal conductivity

Inactive Publication Date: 2016-01-20
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These are all related to the preparation method. The existing preparation method cannot provide a negative expansion manganese carbon compound with a perovskite-like structure with a wide enough temperature range, a constant expansion coefficient, and high purity.

Method used

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  • A kind of perovskite-like structure negative expansion manganese carbon compound preparation method
  • A kind of perovskite-like structure negative expansion manganese carbon compound preparation method
  • A kind of perovskite-like structure negative expansion manganese carbon compound preparation method

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Effect test

Embodiment 1

[0028] A perovskite-like structure with negative expansion of Mn 3 The preparation method of SnC solid comprises the following steps:

[0029] (1) According to the stoichiometric ratio Mn:Sn:C=3:1:1, take manganese powder, tin powder and graphite powder, the powder purity is 99.9% or above, and the powder particle size is 300 mesh;

[0030] (2) Grind the three kinds of powders in a mortar for more than 1 hour, and mix well;

[0031] (3) Take an appropriate amount of uniformly mixed powder, and use a stainless steel mold and a tablet press to compress the powder into a sheet, with a pressure of 20Mpa;

[0032] (4) Pack the sample that is compressed into a sheet into a quartz tube, then connect the quartz tube to the molecular pump and vacuumize it. When the vacuum reaches 10 -4 At Pa, use an oxyacetylene flame to melt the quartz tube for sealing;

[0033] (5) Put the vacuum quartz tube containing the sample into the sintering furnace, raise the temperature to 800°C at a rate...

Embodiment 2

[0042] A perovskite-like structure with negative expansion of Mn 3 The preparation method of SnC solid comprises the following steps:

[0043] (1) According to the stoichiometric ratio Mn:Sn:C=3:1:1, take a certain amount of manganese powder, tin powder and graphite powder, the powder purity is 99.9% or more, and the powder particle size is 300 mesh;

[0044] (2) Grind the three kinds of powders in a mortar for more than 1 hour, and mix well;

[0045] (3) Take an appropriate amount of uniformly mixed powder, and use a stainless steel mold and a tablet press to compress the powder into a sheet, with a pressure of 20Mpa;

[0046] (4) Pack the sample that is compressed into a sheet into a quartz tube, then connect the quartz tube to the molecular pump and vacuumize it. When the vacuum reaches 10 -4 At Pa, use an oxyacetylene flame to melt the quartz tube for sealing;

[0047] (5) Put the vacuum quartz tube with the sample into the sintering furnace, raise the temperature to 800°...

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Abstract

The invention discloses a method for preparing a negative-expansion Mn3SnC solid with a perovskite-like structure. The method mainly comprises the following steps: weighing manganese powder, tin powder and graphite powder according to the stoichiometric ratio that Mn: Sn: C= 3: 1: 1; grinding for more than 1 hour in a mortar; pressing the ground powder into flakes; loading to a quartz tube, vacuumizing and sealing; putting into a sintering furnace, heating to the temperature of 800 DEG C at the rate of 10 DEG C per minute, carrying out heat preservation on the temperature for 100 hours, and carrying out furnace cooling; taking an intermediate product sample out of the quartz tube, and crushing the intermediate product sample; putting the crushed intermediate product sample in an agate mortar, and grinding for more than 1 hour; pressing the ground powder into flakes; loading to a quartz tube, vacuumizing and sealing; putting into a sintering furnace, heating to the temperature of 800 DEG C at the rate of 10 DEG C per minute, carrying out heat preservation on the temperature for 72 hours, and carrying out furnace cooling; taking the sample out of the quartz tube, thereby obtaining the required negative-expansion Mn3SnC with the perovskite-like structure.

Description

technical field [0001] The invention belongs to the technical field of negative expansion materials, and in particular relates to a preparation method of a perovskite-like structure negative expansion manganese-carbon compound. Background technique [0002] Generally, solid materials have the characteristics of thermal expansion and cold contraction. However, in some special cases, it is desired that the material has special physical properties of negative expansion or zero expansion. Therefore, negative expansion materials are one of the hot topics in current material science research. The so-called negative expansion performance refers to that within a certain temperature range, as the temperature increases, the length or volume of the material decreases. Because this kind of material can be used to adjust the expansion coefficient of some key components, it has high research and practical application value. With the development of science and technology, materials with t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/30C04B35/56C04B35/622C01B32/90
Inventor 温永春王聪聂曼孙莹禇立华
Owner YANCHENG INST OF TECH