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A kind of negative expansion material and solid phase sintering synthesis method thereof

A negative expansion material and solid-phase sintering technology, applied in the field of new negative-expansion materials and their solid-phase sintering synthesis, can solve problems such as loss of negative thermal expansion properties, and achieve the effects of cheap preparation of raw materials and simple sintering process

Active Publication Date: 2016-06-08
ZHENGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has recently been found that some fluorides also have negative thermal expansion properties, but most only show negative thermal expansion at very low temperatures, and our tests on some fluorides have shown that fluorides react with O in air when heated in an air environment , losing the negative thermal expansion property

Method used

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  • A kind of negative expansion material and solid phase sintering synthesis method thereof
  • A kind of negative expansion material and solid phase sintering synthesis method thereof
  • A kind of negative expansion material and solid phase sintering synthesis method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Will analyze the pure raw material ZrO 2 、Sc 2 o 3 、WO 3 and NH 4 h 2 PO 4 Weigh it according to the stoichiometric ratio Zr:Sc:W:P=1:1:2:1, put it in a mortar and grind it for about 2 hours. The powder was compressed into a cylinder with a diameter of 10 mm and a height of 10 mm with a uniaxial tablet press at a pressure of 300 MPa. Set up a high-temperature tube furnace to raise the temperature to a sintering temperature of 1200°C, put the corundum crucible containing the sample into the tube furnace at the sintering temperature, sinter in air at normal pressure for 5 hours, and cool naturally in air. For the phase analysis of the XRD pattern corresponding to the product, see figure 1 , compared with the XRD spectrum library, there are no raw material peaks and impurity peaks in the XRD spectrum, indicating that the prepared sample is a pure orthorhombic ZrScW 2 PO 12 .

Embodiment 2

[0017] The difference from Example 1 is that a high-temperature tube furnace is set to raise the temperature to a sintering temperature of 1300° C., and the sintering time is 3 hours. For the phase analysis of the XRD pattern corresponding to the product, see figure 2 , compared with the XRD spectrum library, there is no raw material peak and possible intermediate product ZrP in the XRD spectrum 2 o 7 and other impurity peaks, indicating that the prepared sample is pure orthorhombic ZrScW 2 PO 12 .

[0018] Linear thermal expansion test experiment

[0019] The ZrScW prepared in embodiment 2 2 PO 12 For the analysis of the change curve of the relative length of ceramics with the test temperature, see image 3 , it can be calculated that from room temperature to 400 °C, ZrScW 2 PO 12 The coefficient of linear expansion is about -2.03×10 -6 ℃ -1 , indicating that it exhibits negative thermal expansion properties.

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Abstract

The present invention is the field of inorganic non -metal materials technology. It is specially disclosed a new type of negative expansion material and its solid -phase fever combination.The molecular formula of the new negative expansion material is: ZRSCW2PO12.Taking ZRO2, SC2O3, WO3, and NH4H2PO4 as the raw material, the chemical measurement ratio of ZR: SC: w: p = 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1:Cooling the target product; wherein the sintering conditions are: the temperature is 1200-1300 ° C, the time is 3-5?H, the pressure is normal pressure, and the atmosphere is air.The present invention provides a new negative expansion material for the molecular formula for ZRSCW2PO12. It has negative thermal expansion properties in the wide temperature zone and has engineering application value; prepares low-cost raw materials and easy sintering process;Is 3-5?H, suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, in particular to a kind of molecular formula ZrScW 2 PO 12 A new type of negative expansion material and its solid-state sintering synthesis method. Background technique [0002] Most materials have thermal expansion and contraction properties, thermal stress or thermal shock caused by thermal expansion and contraction and expansion coefficient mismatch often lead to material or device fatigue, performance degradation, temporary or permanent failure, fracture and shedding, thus Cause a lot of waste and even catastrophic consequences of materials and devices, such as the cooling system to ensure the stable operation of high-power lasers, the complex structure design of the large telescope system to compensate the focal length change caused by temperature, the constant temperature system of the optical communication system to prevent the center wavelength drift of the fibe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 梁二军葛向红刘献省程永光晁明举
Owner ZHENGZHOU UNIV