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Material with negative thermal expansion performance and preparation method thereof

A negative thermal expansion and mold technology, applied in the field of negative thermal expansion materials, can solve the problems of insufficient negative thermal expansion performance and weakened NTE effect, and achieve the effects of enhanced negative thermal expansion, widened negative thermal expansion temperature zone, and enhanced ferroelectricity.

Inactive Publication Date: 2019-04-16
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PbTiO 3 The negative thermal expansion performance of the material is not enough to make it widely used, and most of the existing modification methods will make PbTiO 3 The NTE effect weakens

Method used

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  • Material with negative thermal expansion performance and preparation method thereof
  • Material with negative thermal expansion performance and preparation method thereof
  • Material with negative thermal expansion performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment provides a material with strong negative thermal expansion and a preparation method thereof. The chemical formula of the material with strong negative thermal expansion described in this embodiment is (1-x)PbTiO 3 -xBiCoO 3 (0.0≤x≤1.0); the specific steps of the preparation method are:

[0042] Step 1: According to PbO:TiO 2 : Bi 2 o 3 :Co 3 o 4 The ratio of the amount of the substance of the sample is 6(1-x): 6(1-x): 3x: 2x batching, mixing, followed by pretreatment, and heat preservation at a temperature of 300-800°C for 0.5-10h;

[0043] The second step: put the mixed sample into an Au or Pt cylinder crucible with a diameter of Φ (2-10mm) and a height of h (2-10mm), and add KClO 4 As an oxidant, the Au / Pt cylinder crucible containing the mixed sample was then placed into a closed mold including pyrophyllite, BN, graphite, Mo flakes, ceramic tubes, and thermocouples;

[0044] Step 3: Place the mold in such as figure 1 In the high-pressure synt...

Embodiment 2

[0051] This embodiment provides a material with strong negative thermal expansion and a preparation method thereof. The chemical formula of the material with strong negative thermal expansion described in this embodiment is (1-x)PbTiO 3 -xBiCoO 3 (0.0≤x≤1.0); the specific steps of the preparation method are:

[0052] Step 1: According to PbO:TiO 2 : Bi 2 o 3 :Co 3 o 4 The ratio of the amount of the substance of the sample is 6(1-x): 6(1-x): 3x: 2x batching, mixing, followed by pretreatment, and heat preservation at a temperature of 300-800°C for 0.5-10h;

[0053] The second step: put the mixed sample into an Au or Pt cylinder crucible with a diameter of Φ (2-10mm) and a height of h (2-10mm), and add KClO 4 As an oxidant, the Au / Pt cylinder crucible containing the mixed sample was then placed into a closed mold including pyrophyllite, BN, graphite, Mo flakes, ceramic tubes, and thermocouples;

[0054] Step 3: Place the mold in such as figure 1 In the high-pressure synt...

Embodiment 3

[0061] This embodiment provides a material with strong negative thermal expansion and a preparation method thereof. The chemical formula of the material with strong negative thermal expansion described in this embodiment is (1-x)PbTiO 3 -xBiCoO 3 (0.0≤x≤1.0); the specific steps of the preparation method are:

[0062] Step 1: According to PbO:TiO 2 : Bi 2 o 3 :Co 3 o 4 The ratio of the amount of the substance of the sample is 6(1-x): 6(1-x): 3x: 2x batching, mixing, followed by pretreatment, and heat preservation at a temperature of 300-800°C for 0.5-10h;

[0063] The second step: put the mixed sample into an Au or Pt cylinder crucible with a diameter of Φ (2-10mm) and a height of h (2-10mm), and add KClO 4 As an oxidant, the Au / Pt cylinder crucible containing the mixed sample was then placed into a closed mold including pyrophyllite, BN, graphite, Mo flakes, ceramic tubes, and thermocouples;

[0064] Step 3: Put the mold in the high-pressure synthesis equipment, and at...

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Abstract

The invention relates to a material with negative thermal expansion performance and a preparation method thereof. The method is characterized by comprising the steps that 1, PbO, TiO2, Bi2O3 and Co3O4samples are mixed and blended uniformly according to a preset ratio, and pre-processing is conducted; 2, the mixed samples are added to a tube crucible, an antioxidant is added, and the tube cruciblecontaining the mixed samples is placed into a sealed mold; 3, the sealed mold is placed in high-pressure synthesis equipment, temperature and pressure are increased, heat and pressure preserving areconducted, and the temperature and the pressure are reduced to a room temperature and normal pressure; 4, the processed samples are taken out and demolded, the processed samples are washed, the samples are dried, and the novel material (1-x)PbTiO3-xBiCoO3 with the negative thermal expansion performance is obtained, wherein 0.0<=x<=1.0. Compared with a traditional material with the negative thermalexpansion performance, the material, with the negative thermal expansion performance, prepared through the method has high purity, high repeatability, significantly enhanced negative thermal expansion performance and broadened negative expansion temperature zone, and therefore the material has wide scientific researching and practical value.

Description

technical field [0001] The invention belongs to the technical field of negative thermal expansion materials. It specifically relates to a material with negative thermal expansion and a preparation method thereof. Background technique [0002] "Expansion with heat and contraction with cold" is a general thermal property that most substances in nature have. Thermal expansion is one of the most common problems faced by the fields of machinery, electronics, optics and structural materials. Due to the mismatch of thermal expansion coefficients of materials, Poor thermal shock resistance results in shortened service life or even failure of materials and devices. In a certain temperature range, the macroscopic volume of the negative thermal expansion material will "shrink with heat and expand with cold" as the temperature changes, that is, the negative thermal expansion (Negative Thermal Expansion, NTE) effect. The materials with NTE effect and conventional positive expansion mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/472C04B35/622C04B35/645
CPCC04B35/472C04B35/622C04B35/645C04B2235/3201C04B2235/3275C04B2235/3298C04B2235/444C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/768C04B2235/9607
Inventor 潘昭陈骏邢献然樊希安李光强李亚伟
Owner WUHAN UNIV OF SCI & TECH
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