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A New Type of Negative Thermal Expansion Ceramics zr 2 w 2 p 2 o 15 and its sintering synthesis method

A technology of negative thermal expansion and synthesis method, which is applied in the field of novel negative thermal expansion ceramic Zr2W2P2O15 and its sintering synthesis, can solve the problems of poor mechanical properties, etc., and achieve the effect of simple sintering process and cheap raw materials

Inactive Publication Date: 2017-09-01
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorption and release of water of crystallization simultaneously cause huge shrinkage and expansion of the material, which deteriorates its mechanical properties and restricts its application (E. J. Liang, Negative thermal expansion materials and their applications: a survey of recent patents, Rec. Pat. Mater. Sci. 3 (2010) 106-28)

Method used

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  • A New Type of Negative Thermal Expansion Ceramics zr <sub>2</sub> w <sub>2</sub> p <sub>2</sub> o <sub>15</sub> and its sintering synthesis method
  • A New Type of Negative Thermal Expansion Ceramics zr <sub>2</sub> w <sub>2</sub> p <sub>2</sub> o <sub>15</sub> and its sintering synthesis method
  • A New Type of Negative Thermal Expansion Ceramics zr <sub>2</sub> w <sub>2</sub> p <sub>2</sub> o <sub>15</sub> and its sintering synthesis method

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Will analyze the pure raw material ZrO 2 、WO 3 and NH 4 h 2 PO 4 Weigh it according to the molar ratio Zr:W:P=1:1:1, put it into the mortar and grind it for about 2 hours. The powder was compressed into a cylindrical sample with a diameter of 10 mm and a height of 10 mm under a pressure of 300 MPa with a uniaxial tablet press. Set up a high-temperature tube furnace to heat up to the sintering temperature of 1400 °C, put the corundum crucible with the sample into the tube furnace at the sintering temperature, and sinter in normal pressure air for 10 min for the first time, then take it out and put it into room temperature water for quenching, grinding, and then Press it into a cylinder with a diameter of 10 mm and a height of 10 mm under a pressure of 300 MPa, put it into a corundum crucible again, put it into a tube furnace, and re-sinter at 1400 °C for 3 h in atmospheric air to obtain the target product. For the phase analysis of the XRD pattern corresponding to t...

Embodiment 2

[0017] The implementation process of embodiment 2 is basically the same as that of embodiment 1, the difference is that both the first sintering and re-sintering temperatures are adjusted to 1420°C. The corresponding XRD pattern phase analysis of the product and figure 1 same, indicating that the prepared product is a pure phase of Zr 2 W 2 P 2 o 15 .

[0018] Linear thermal expansion test experiment (measured with a thermal dilatometer)

[0019] Ceramic Zr prepared in Example 1 (1400°C) and Example 2 (1420°C) 2 W 2 P2 o 15 In the temperature range of 30-600 ℃, the relative length change curve with temperature is shown in figure 2 , in the -135-400°C temperature range, the relative length change curve with temperature is shown in image 3 .

[0020] from figure 2 with image 3 Can calculate: the ceramic Zr that embodiment 1 prepares 2 W 2 P 2 o 15 The coefficient of linear expansion from -120°C to 400°C is -3.25×10 -6 ℃ -1 , the coefficient of linear expans...

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Abstract

The invention belongs to the field of inorganic non-metallic materials, and particularly discloses a novel negative thermal expansion ceramic and a sintering synthesis method thereof. Its molecular formula is: Zr2W2P2O15. Use ZrO2, WO3 and NH4H2PO4 as raw materials, weigh the raw materials according to the stoichiometric molar ratio of Zr:W:P in the target product Zr2W2P2O15, mix and grind evenly, sinter for 5-30min for the first time directly or after tableting, take it out and put it in water at room temperature for quenching, Grind evenly, and re-sinter for 2-5 hours directly or after tableting to obtain the target product; among them, the first sintering and re-sintering are all sintered at 1350-1450°C in normal pressure air. The beneficial effects of the present invention are as follows: 1. The novel negative thermal expansion ceramics of the present invention have negative thermal expansion properties in a wide temperature range and have engineering application value. 2. The preparation of raw materials is cheap, and the sintering process is simple; sintering at 1350-1450°C in normal pressure air, the sintering time is 2-5 h, suitable for mass production.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a novel negative thermal expansion ceramic Zr 2 W 2 P 2 o 15 and its 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 fiber Bragg grating, The constant ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/447C04B35/495C04B35/622
Inventor 梁二军袁保合程永光葛向红陈冬霞晁明举
Owner ZHENGZHOU UNIV