Sintering synthesis method of metal-based ceramic material Al-Zr2P2WO12 having controllable thermal expansion coefficient

A technology of thermal expansion coefficient and ceramic materials, which is applied in the field of sintering synthesis of metal-based ceramic materials Al-Zr2P2WO12, to achieve the effects of low sintering temperature, fast speed and simple process

Active Publication Date: 2012-05-02
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, Al-Zr has not been seen at home and abroad 2 P 2 WO 12 Report on Composite Materials and Their Preparation Methods

Method used

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  • Sintering synthesis method of metal-based ceramic material Al-Zr2P2WO12 having controllable thermal expansion coefficient
  • Sintering synthesis method of metal-based ceramic material Al-Zr2P2WO12 having controllable thermal expansion coefficient
  • Sintering synthesis method of metal-based ceramic material Al-Zr2P2WO12 having controllable thermal expansion coefficient

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] To analyze pure ZrOCl 2 ·8H 2 O, 5(NH 4 ) 2 O·12WO 3 ·5H 2 O and NH 4 h 2 PO 4 Preparation of Zr as raw material 2 P 2 WO 12 Negative expansion ceramic powder. According to the target product Zr 2 P 2 WO 12 Medium stoichiometric ratio (molar ratio) Zr: P: W = 2: 2: 1 Weigh ZrOCl 2 ·8H 2 O, NH 4 h 2 PO 4 and 5(NH 4 ) 2 O·12WO 3 ·5H 2 O, respectively add water to dissolve and prepare the corresponding solution, mix NH 4 h 2 PO 4 solution and ZrOCl 2 ·8H 2 O solution was added dropwise to 5(NH 4 ) 2 O·12WO 3 ·5H 2 In the O solution, the mol ratio of Zr:P:W in the mixed solution is 2: 2: 1 to obtain a turbid solution. with HCl and NH 3 ·H 2 O adjust the pH value to 9, continue to stir for 3 hours until uniform, leave to stand and age for 4 hours, separate layers, remove the supernatant, and the precipitate is at 120 o C drying 5h, at 900 o C sintered for 6h to get Zr 2 P 2 WO 12 Negative expansion ceramic powder. For the phase analysis...

Embodiment 2

[0033] The Zr that embodiment 1 prepares 2 P 2 WO 12 Negative expansion ceramic powder mixed with commercial aluminum powder to prepare metal matrix composite ceramic Al-Zr with controllable coefficient of thermal expansion 2 P 2 WO 12 . Combining commercial Al powder with Zr 2 P 2 WO 12 The mass ratio of the ceramic powder is 0.1186, and the total mass is 2 g. Put it into a mortar and grind it for 1-3 h to mix evenly. Then press it into a cylinder with a diameter of 10 mm and a height of 15 mm with a tablet press at a pressure of 200 MPa. Placed in a low temperature box furnace to heat up to the sintering temperature of 840 o C, the sintering time is 1 h. figure 2 Is the product Al-Zr 2 P 2 WO 12 XRD pattern, XRD pattern with orthorhombic phase of Zr 2 P 2 WO 12 (PDF# 01-085-2239) corresponds exactly to the diffraction peak of elemental Al, indicating that the prepared material is Al-Zr 2 P 2 WO 12 metal matrix composite ceramics, no Zr 2 P 2 WO 12 break...

Embodiment 3

[0035] The difference with Example 2 is: the preparation of Zr 2 P 2 WO 12 During the negative expansion ceramic powder, the steps are basically the same as in Example 1, except that the sintering temperature is 950 o C, sintering time 5h. Commercial Al powder with Zr 2 P 2 WO 12 The mass ratio of the ceramic powder is 0.1286. Placed in a low temperature box furnace to heat up to the sintering temperature of 800 o C, the sintering time is 2 h. made of Al-Zr 2 P 2 WO 12 For the corresponding X-ray diffraction phase analysis see image 3 , XRD pattern with orthorhombic Zr 2 P 2 WO 12 (PDF# 01-085-2239) corresponds exactly to the diffraction peak of elemental Al, indicating that the prepared material is Al-Zr 2 P 2 WO 12 metal matrix composite ceramics, no Zr 2 P 2 WO 12 break down.

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Abstract

The invention belongs to the field of inorganic non-metallic materials, and discloses a sintering synthesis method of a metal-based ceramic material Al-Zr2P2WO12 having a controllable thermal expansion coefficient. The sintering synthesis method utilizes ZrOCl2.8H2O, 5(NH4)2O.12WO3.5H2O and NH4H2PO4 as raw materials. The raw materials are respectively prepared into solutions. The sintering synthesis method comprises the following steps of 1, orderly and dropwisely adding a NH4H2PO4 solution and a ZrOCl2.8H2O solution into a 5(NH4)2O.12WO3.5H2O solution with stirring, wherein a mole ratio of Zr, P to W in the mixed solution is 2: 2: 1, adjusting a pH value of the mixed solution to a pH value of 8 to 10, and continuously stirring well, 2, standing for layering, removing supernatant and drying precipitates to obtain a precursor, and 3, sintering the dried precursor at a temperature of 900 to 1000 DEG C for 4 to 6 hours to obtain Zr2P2WO12 ceramic powder having a negative expansion coefficient, mixing the Zr2P2WO12 ceramic powder having a negative expansion coefficient and aluminum powder, grinding uniformly, compacting the mixture into blocks, and sintering at a temperature of 660 to 840 DEG C for 1 to 4 hours. The sintering synthesis method has simple processes, does not produce pollution, allows a low sintering temperature and a low sintering speed, and is suitable for large-scale production. Through combination of the Zr2P2WO12 ceramic powder having a negative expansion coefficient and the aluminum powder, the sintering synthesis method realizes production of the metal-based ceramic material Al-Zr2P2WO12 having a controllable thermal expansion coefficient, wherein the controllable thermal expansion coefficient can be changed in a wide range by control.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a metal-based ceramic material Al-Zr with a controllable thermal expansion coefficient 2 P 2 WO 12 sintering synthesis method. Background technique [0002] Because different materials have different thermal expansion coefficients, the thermal stress caused by temperature changes often causes a series of problems such as material or device performance degradation, temporary or permanent failure, shedding and fracture, such as the center wavelength of fiber Bragg grating drifts with temperature, The focal length of the space telescope changes with the temperature, causing the image quality to decline, the thermal lens effect, and the insulation layer of the spacecraft to fall off, etc. Another example is the ceramic electrode of the solid oxide fuel cell (the general working temperature is 800-1000 o C) The connection with the external circuit will cause a serie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/12
Inventor 梁二军刘献省成福兴晁明举
Owner ZHENGZHOU UNIV
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