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Negative thermal expansion material HfMnMo2PO12 and preparation method thereof

A negative thermal expansion material, hfmnmo2po12 technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problem of few negative thermal expansion materials, and achieve the effect of large negative thermal expansion coefficient, wide source and wide application range

Inactive Publication Date: 2014-10-22
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on negative thermal expansion materials is still in the exploratory stage. Considering factors such as preparation conditions and environmental protection, there are still few negative thermal expansion materials that are easy to industrialize and widely used.

Method used

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  • Negative thermal expansion material HfMnMo2PO12 and preparation method thereof
  • Negative thermal expansion material HfMnMo2PO12 and preparation method thereof
  • Negative thermal expansion material HfMnMo2PO12 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The negative thermal expansion material HfMnMo prepared in this embodiment 2 PO 12 , by HfO 2 , Mn 2 o 3 、MoO 3 , NH 4 h 2 PO 4 It is made by hot pressing and sintering, which specifically includes the following steps:

[0029] (1) In terms of molar ratio, the raw materials are divided into HfO 2 :Mn 2 o 3 :MoO 3 : NH 4 h 2 PO 4 =2:1:4:2, weighed, mixed evenly, and ground for 2 hours; in order to mix the raw materials evenly, add an appropriate amount of absolute ethanol during the mixing or grinding of the raw materials;

[0030] (2) After the raw materials in step (1) are dried, they are pressed into tablets to make embryos;

[0031] Dry at 80°C for half an hour;

[0032] Tablet pressing is to use a single-axis dry powder tablet press to make the powder into a cylindrical green body with a diameter of 10 mm and a height of about 5 mm under a pressure of 200 MPa;

[0033] (3) Place the embryo body in step (2) in a box-type furnace at a heating rate of ...

Embodiment 2

[0036] The preparation of this example is the same as that of Example 1, only the sintering temperature is adjusted to 800° C., and the holding time is 8 hours.

[0037] The negative thermal expansion material HfMnMo prepared in this embodiment 2 PO 12 Corresponding XRD pattern phase analysis see figure 2 , the analysis shows that the product phase is mainly an orthogonal structure, and its main diffraction peak is consistent with the PDF card number 00-051-0581, indicating that the prepared sample is a pure phase substance.

Embodiment 3

[0039] The preparation of this example is the same as that of Example 1, only the sintering temperature is adjusted to 900° C., and the holding time is 6 hours.

[0040] The negative thermal expansion material HfMnMo prepared in this embodiment 2 PO 12 Corresponding XRD pattern phase analysis see image 3 , the analysis shows that the product phase is mainly an orthogonal structure, and its main diffraction peak is consistent with the PDF card number 00-051-0581, indicating that the prepared sample is a pure phase substance.

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Abstract

The invention belongs to the technical field of inorganic nonmetallic materials and particularly relates to a negative thermal expansion material HfMnMo2PO12 and a preparation method thereof. The material is prepared by hot pressed sintering of HfO2, Mn2O3, MoO3 and NH4H2PO4. The preparation method comprises the steps of grinding, preparing a blank, sintering and the like. The negative thermal expansion material HfMnMo2PO12 provided by the invention has the advantages of large negative thermal expansion coefficient and wide temperature range so as to be wide in application range; raw materials for preparing the negative thermal expansion material HfMnMo2PO12 are wide in source and low in cost; the preparation method is simple, short in period and pollution-free so as to be suitable for industrial production and relatively high in popularization and application values.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, in particular to a negative thermal expansion material HfMnMo 2 PO 12 and its preparation method. Background technique [0002] Most materials in nature have the property of thermal expansion and contraction, thermal expansion and contraction of materials, and thermal expansion coefficient mismatch between materials often cause device fatigue, performance degradation or even temporary or permanent failure. With the development of advanced technologies such as aerospace and electronics, the thermal expansion and contraction of materials has increasingly become the focus of people's concern in the engineering field. [0003] The emergence of negative thermal expansion materials provides opportunities and possibilities to solve this problem. Designing and modulating controllable expansion and zero expansion materials has important application prospects in high-tech enginee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45
Inventor 晁明举张牛周文进刘亚明梁二军李玉祥冯东省
Owner ZHENGZHOU UNIV
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