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Novel negative thermal expansion material SrEr2O4-NiO-SrO and preparation method thereof

A srer2o4-nio-sro, negative thermal expansion material technology, applied in the field of inorganic non-metallic materials, can solve the problem of few materials, achieve low cost, good industrial application prospects, and wide temperature range

Inactive Publication Date: 2014-06-25
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on negative expansion materials is still in the stage of experimental exploration. Considering the preparation conditions and environmental protection, there are few materials available for wide application.

Method used

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  • Novel negative thermal expansion material SrEr2O4-NiO-SrO and preparation method thereof
  • Novel negative thermal expansion material SrEr2O4-NiO-SrO and preparation method thereof
  • Novel negative thermal expansion material SrEr2O4-NiO-SrO and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Er 2 o 3 , SrCO 3 、Ni 2 o 3 Weigh them separately according to the atomic molar ratio Er:Sr:Ni=0.7:0.3:1, mix them, and grind for about 0.5h, then add absolute ethanol (in order to make the grinding more fully and uniformly) continue grinding for about 1h, and then grind at 80°C Dry for 30 minutes, continue to grind for a few minutes to mix the raw materials evenly. Use a uniaxial tablet press with a pressure of 200MPa to press into a cylindrical embryo with a diameter of 10mm and a height of about 5mm (depending on the shape of the mold). Set up a high-temperature tube furnace to raise the temperature to 900°C, sinter for 2 hours, then continue to raise the temperature to 1350°C for 10 hours, and cool down naturally in the furnace.

[0031] For the phase analysis of the XRD pattern corresponding to the product, see figure 1 , the analysis shows that the product phase is mainly NiO phase (PDF No. 00-004-0835), SrEr 2 o 4 Phase (PDF No. 00-046-0132) and SrO (PDF ...

Embodiment 2

[0033] Er 2 o 3 , SrO, Ni 2 o 3 Weigh them separately according to the atomic molar ratio Er:Sr:Ni=0.3:0.7:1, and the rest of the steps are the same as in Example 1. The first sintering temperature is 900°C for 2 hours, and the second sintering temperature is 1200°C for 6 hours.

[0034] The X-ray diffraction (XRD) spectrum phase analysis of the prepared product is as follows: figure 2 . Analysis shows that the product mainly contains NiO phase, SrEr2 o 4 phase and SrO.

Embodiment 3

[0036] Er 2 o 3 , Sr(NO 3 ) 2 、Ni 2 o 3 Weigh them separately according to the atomic molar ratio Er:Sr:Ni=0.3:0.7:1, and the rest of the steps are the same as in Example 1. The first sintering temperature is 1000°C for 4 hours, and the second sintering temperature is 1300°C for 6 hours.

[0037] The X-ray diffraction (XRD) pattern of the prepared product is as follows image 3 . The product mainly contains NiO phase, SrEr 2 o 4 phase and SrO.

[0038] The scanning electron microscope (SEM) pictures of the prepared products are as follows: Figure 8 As shown, the magnifications of (a), (b) and (c) are 1000, 5000 and 20000 times respectively.

[0039] The thermal analysis-thermogravimetric curve (DSC-TG) test of the prepared product is as follows: Figure 9 shown, from Figure 9 It can be seen that in the temperature range where negative expansion occurs, there is a large endothermic peak accompanied by weight loss.

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Abstract

The invention belongs to the field of inorganic non-metal materials and relates to a negative thermal expansion material SrEr2O4-NiO-SrO and a preparation method thereof. The invention provides a novel negative thermal expansion material SrEr2O4-NiO-SrO which is synthesized by sintering Er2O3, Sr2O3 / SrO / Sr(NO3)2, and Ni2O3 as raw materials through adopting a solid phase method according to the mole ratio of Er:Sr:Ni being (1-x):x:1, wherein x is more than 0 and smaller than 1, preferably 0.7-0.9. The invention also provides a preparation method of the novel negative thermal expansion material SrEr2O4-NiO-SrO. The prepared novel negative thermal expansion material is large in negative thermal expansion coefficient and has a wide temperature zone; the raw materials are easily available and low in cost; the preparation method is simple, short in period, and pollution-free; the negative thermal expansion property can be regulated by adjusting the sintering temperature and raw material proportion, and the novel negative thermal expansion material SrEr2O4-NiO-SrO has good industrialization application prospects.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to a negative thermal expansion material and a preparation method thereof. Background technique [0002] In the field of engineering technology, the difference in thermal expansion coefficient of different materials, or even the difference in thermal expansion caused by the existence of thermal gradients at different depths from the surface to the interior of the same material, often leads to thermal stress. These thermal stresses often lead to deterioration of the performance indicators of materials or devices, such as systematic errors of thermal dilatometers, cracks or disconnections in high-temperature furnace tubes or furnaces, cracks in water pipes or water tanks in winter, and image quality degradation caused by changes in the focal length of space telescopes with temperature , The deformation of the anti-aircraft gun barrel reduces the hit rate of the shell, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/50C04B35/622
Inventor 晁明举付林杰陈贺梁二军刘献省刘亚明
Owner ZHENGZHOU UNIV