Novel negative thermal expansion material Sm1-xSrxMnO3-sigma

A negative thermal expansion material, a new type of technology, applied in the field of inorganic non-metallic materials, can solve the problem of few materials, and achieve the effect of simple method, good scope of application, and good adaptability to popularization and application

Inactive Publication Date: 2014-12-10
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 Sm1-xSrxMnO3-sigma
  • Novel negative thermal expansion material Sm1-xSrxMnO3-sigma
  • Novel negative thermal expansion material Sm1-xSrxMnO3-sigma

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Embodiment 1

[0028] The new negative thermal expansion material Sm prepared in this embodiment 1-x Sr x MnO 3-σ , In Sm 2 O 3 , SrO, Mn 2 O 3 As a raw material, it is prepared by solid-phase synthesis, which specifically includes the following steps:

[0029] (1) Weigh the raw materials with the molar ratio Sm:Sr:Mn=(1-x):x:1, where x=0, that is, the raw materials used in this embodiment only include Sm 2 O 3 , Mn 2 O 3 , The molar ratio of the two is 1:1; mix and grind the raw materials for 0.5h, in order to make the mixing uniform, add an appropriate amount of absolute ethanol and continue to grind for 0.5h, then dry at 353K for 30min, continue to grind for a few minutes to mix the raw materials Evenly

[0030] (2) tableting the mixture in step (1); the tableting is compressed by a uniaxial tablet press at a pressure of 200 MPa for 2 to 3 minutes to form a cylindrical embryo with a diameter of 10 mm and a height of about 5 mm;

[0031] (3) Put the material after pressing in step (2) into a box ...

Embodiment 2

[0034] The steps of preparing the negative thermal expansion material in this embodiment are the same as in embodiment 1, only adjusting x=0.1, and adjusting the sintering parameters as follows: heat preservation at 1273K for 10 hours, and then continue to heat up to 1723K for sintering and heat preservation for 24 hours.

[0035] Prepared negative thermal expansion material Sm 0.9 Sr 0.1 MnO 2.95 The XRD spectrum phase analysis is as figure 2 . Analysis shows that the product mainly contains SmMnO 3 Phase (PDF No. 00-025-0747), SrMnO 3 Phase (PDF number 00-023-1413) and SmMn 2 O 5 (PDF number is 00-052-1096), Sr 2 MnO 4 Phase (PDF number is 01-089-4543), Mn 2 O 3 Phase (PDF number is 01-073-1826).

Embodiment 3

[0037] The steps for preparing the negative thermal expansion material in this embodiment are the same as in embodiment 1, only adjusting x=0.15, and adjusting the sintering parameters as follows: heat preservation at 1273K for 24h, then continue to heat up to 1623K for sintering and heat preservation for 24h.

[0038] Prepared negative thermal expansion material Sm 0.85 Sr 0.15 MnO 2.925 The XRD spectrum phase analysis is as image 3 . Analysis shows that the product mainly contains Sr 2 MnO 5 Phase (PDF number 01-070-3790), SmMnO 3 Phase (PDF number 00-025-0747) and SrMnO 2 . 5 (PDF number is 00-028-1232).

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Abstract

The invention belongs to the field of inorganic nonmetal materials and particularly relates to a novel negative thermal expansion material Sm1-xSrxMnO3-sigma oxide sosoloid and a preparation method thereof. The negative thermal expansion material is prepared by taking Sm2O3, SrO and Mn2O3 as raw materials through a solid-phase synthesis method. The preparation method of the negative thermal expansion material comprises the steps such as mixing, tabletting and sintering. The novel negative thermal expansion material Sm1-xSrxMnO3-sigma oxide sosoloid is relatively good in negative thermal expansion performance. Meanwhile, the negative thermal expansion performances of a sample can be directly regulated and controlled by regulating an element proportion according to the needs, and thus, the scope of application is relatively wide. The method for preparing the novel negative thermal expansion material Sm1-xSrxMnO3-sigma oxide sosoloid is relatively simple, short in period, available in raw materials, low in cost, environmentally friendly and pollution-free, and relatively good in popularization and application adaptability.

Description

Technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and specifically relates to a new type of negative thermal expansion material Sm 1-x Sr x MnO 3-σ Oxide solid solution and its preparation method. Background technique [0002] In the field of engineering technology, the difference in thermal expansion coefficients of different materials, and even the difference in thermal expansion caused by thermal gradients at different depths from the surface to the inside of the same material, often leads to thermal stress. These thermal stresses often cause deterioration of the performance indicators of materials or devices, such as system errors of thermal dilatometers, cracks or disconnections in high-temperature furnace tubes or furnaces, freezing and cracking of water pipes or water tanks in winter, and changes in the focal length of the space telescope due to temperature changes that cause imaging quality degradation , Anti-aircraft barrel de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622
Inventor 晁明举李玉成周文进肖潇刘亚明张牛梁二军李玉祥冯东省
Owner ZHENGZHOU UNIV
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