Method for preparing porous zirconium/aluminum tungstate composite material by spark plasma sintering

A technology of discharge plasma and aluminum composite material, which is applied in the field of preparation of porous zirconium tungstate/aluminum composite material, can solve the problems of fluctuation of thermal expansion curve and high thermal expansion value, and achieves reduction of thermal mismatch force, reduction of γ-phase generation and guarantee The effect of crystal integrity

Inactive Publication Date: 2016-08-24
HARBIN INST OF TECH
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  • Summary
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  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the thermal expansion curve of the existing aluminum-based zirconium tungstate granular composite material fluctuates greatly, and the thermal expansion value is relatively high; and provide a method for preparing porous zirconium tungstate / aluminum composite material by spark plasma sintering method

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  • Method for preparing porous zirconium/aluminum tungstate composite material by spark plasma sintering
  • Method for preparing porous zirconium/aluminum tungstate composite material by spark plasma sintering
  • Method for preparing porous zirconium/aluminum tungstate composite material by spark plasma sintering

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specific Embodiment approach 1

[0025] Specific implementation mode 1: This implementation mode is a method for preparing porous zirconium tungstate / aluminum composite material by spark plasma sintering, which is specifically completed according to the following steps:

[0026] 1. Weighing: Weigh 50-60% zirconium tungstate powder and 40-50% aluminum powder according to the volume fraction;

[0027] 2. Ball mill mixing: Add the zirconium tungstate powder and aluminum powder weighed in step 1 into the polyethylene ball mill tank in turn, then add agate balls, the ball-to-material ratio is 1:(1.2~1.5), and finally add absolute ethanol. The volume ratio of the zirconium tungstate powder and dehydrated alcohol is 1:(1.5~2), and the sealed ball mill is mixed for 12h~24h to obtain the mixed material after the ball mill;

[0028] 3. Drying and sieving: the mixed material after ball milling is dried and sieved to obtain mixed powder;

[0029] 4. Spark plasma sintering: Put the mixed powder into the graphite mold, th...

specific Embodiment approach 2

[0034] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the purity of the zirconium tungstate powder described in step 1 is higher than 95%. Others are the same as the first embodiment. Others are the same as the specific embodiments 1 to 3.

specific Embodiment approach 3

[0035] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the purity of the aluminum powder in step 1 is higher than 99%. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for preparing a porous zirconium / aluminum tungstate composite material by spark plasma sintering, relates to a preparation method for a porous zirconium / aluminum tungstate composite material, and aims to solve the problems of large fluctuation of a thermal expansion curve of a conventional aluminum-base zirconium tungstate particle composite material and high thermal expansion value. The method comprises the following steps: 1, weighing 50 to 60 percent of zirconium tungstate powder and 40 to 50 percent of aluminum powder in volume fraction; 2, performing ball-milling mixing to obtain a ball-milled mixed material; 3, performing drying and sieving to obtain mixed powder; 4, performing spark plasma sintering to obtain the porous zirconium / aluminum tungstate composite material. The method has the advantages that 1, the crystal completeness of zirconium tungstate is guaranteed, and direct interface reaction between the zirconium tungstate and aluminum is effectively inhibited; 2, a sintering aid is not added; 3, generation of a gamma phase is greatly reduced; 4, the porosity is higher while the axial pressure is lower, and the thermal expansion value is smaller while the content of the gamma phase is lower. The method is mainly used for preparing the porous zirconium / aluminum tungstate composite material.

Description

technical field [0001] The invention relates to a preparation method of a porous zirconium tungstate / aluminum composite material. Background technique [0002] Aluminum alloys are widely used in the aerospace field, but aluminum alloys have a high coefficient of thermal expansion. When the aircraft is running in space, the temperature difference caused by the sun's irradiation and non-irradiation can reach 300°C. This can cause a huge thermal expansion mismatch at the joint, which can lead to loss of strength, failure of performance, and more. Therefore, low-expansion aluminum matrix composites have potential value in precision machining and electronic system applications. [0003] Zirconium tungstate (ZrW 2 o 8 ) is a commonly used negative expansion material, which has unique properties such as high negative expansion coefficient and wide temperature range. Zirconium tungstate can be prepared as a material alone, or it can be added to a metal matrix, such as copper or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C29/12
CPCB22F3/11B22F3/14C22C29/12
Inventor 张强周畅张孟孟武高辉
Owner HARBIN INST OF TECH
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