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A kind of preparation method of low-expansion zirconium tungstate/aluminum composite material

A composite material and low-expansion technology, which is applied in the field of preparation of low-expansion ZrW2O8/Al composite materials, can solve the problems of large thermal expansion coefficient of composite materials, reduce internal stress, realize industrialized production and application, and achieve rapid and efficient preparation. Effect

Active Publication Date: 2022-08-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is in order to solve the ZrW that existing method prepares 2 o 8 Excessive content of γ-ZrW in Al composites 2 o 8 As a result, the thermal expansion coefficient of composite materials is relatively large, and a low-expansion ZrW 2 o 8 / Al composite material preparation method

Method used

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  • A kind of preparation method of low-expansion zirconium tungstate/aluminum composite material
  • A kind of preparation method of low-expansion zirconium tungstate/aluminum composite material
  • A kind of preparation method of low-expansion zirconium tungstate/aluminum composite material

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specific Embodiment approach 1

[0037] Embodiment 1: Low-expansion ZrW in this embodiment 2 O 8 The preparation method of / Al composite material is carried out according to the following steps:

[0038] 1. Weighing:

[0039] Weigh 50%~95% ZrW by volume fraction 2 O 8 powder and 5% to 50% aluminum matrix;

[0040] 2. ZrW 2 O 8 Preparation of preforms:

[0041] ZrW 2 O 8 The powder is placed in a molding die and pre-compressed, and then demolded to obtain a pre-compressed block. The pre-compressed block is sintered at high temperature, and then quenched and cooled to room temperature to obtain ZrW 2 O 8 prefab;

[0042] The pressure of the pre-compression molding is 60MPa-150MPa;

[0043] The temperature of the high-temperature sintering is 650°C-750°C, and the time is 10-18 hours; the high-temperature sintering temperature does not reach the destabilizing decomposition temperature, so ZrW can be avoided. 2 O 8 decomposition;

[0044] 3. Preheating and preparation of molten metal matrix:

[0045]...

specific Embodiment approach 2

[0059] Embodiment 2: The difference between this embodiment and Embodiment 1 is: the ZrW described in step 1 2 O 8 The average particle size of the powder is 0.5 to 200 μm.

specific Embodiment approach 3

[0060] Embodiment 3: This embodiment is different from Embodiment 1 or 2 in that: the aluminum matrix in step 1 is pure aluminum or aluminum alloy; the aluminum alloy is Al-Si alloy, Al-Si-Cu alloy, Al - One or a combination of Cu-Mg alloy, Al-Zn-Cu alloy, Al-Zn-Mg-Cu alloy, Al-Si-Cu-Mg alloy.

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Abstract

A preparation method of a low-expansion zirconium tungstate / aluminum composite material, relating to a low-expansion ZrW 2 O 8 / Al composite material preparation method. In order to solve the problem of excessive γ‑ZrW content in the zirconium tungstate / Al composite prepared by the existing method 2 O 8 This leads to the problem of a large thermal expansion coefficient of the composite material. Method: Weigh ZrW by volume fraction 2 O 8 powder and aluminum matrix; ZrW 2 O 8 The powder is placed in a molding die and pre-compressed, then sintered at high temperature and quenched to obtain ZrW 2 O 8 Preforms, impregnated with liquid aluminium. In the low-expansion zirconium tungstate / Al composite material prepared by the invention, the aluminum matrix and ZrW 2 O 8 The particles all have a continuous structure, which reduces the γ‑ZrW in the as-cast zirconium tungstate / Al composites 2 O 8 content. The internal stress is reduced by stress relief annealing treatment, thereby reducing the thermal expansion coefficient of zirconium tungstate / Al composites. The invention is suitable for preparing zirconium tungstate / aluminum composite material.

Description

technical field [0001] The present invention relates to a low expansion ZrW 2 O 8 / Al composite material preparation method. Background technique [0002] In electronic precision systems such as electronic packaging and microelectronics, the function of components is closely related to the shape accuracy and stress changes. If the thermal expansion coefficients of the components (such as Si, GaAs, etc.) and the packaging materials do not match, it will cause a great thermal mismatch force, which will greatly affect the size and functional failure. At present, problems such as structural changes and functional failures caused by mismatching thermal expansion coefficients in the fields of communication information and microelectronics limit the development of this field. [0003] Zirconium tungstate (ZrW 2 O 8 ) is a material with negative thermal expansion coefficient, which has isotropic negative expansion effect in the large temperature range of 0.3~1050K, and α-ZrW 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C1/03C22C29/12C22F1/00C21D1/26
CPCC22C1/1015C22C1/1036C22C29/12C22F1/00C21D1/26C22C1/1021C22C1/1073
Inventor 张强孟庆宇孙凯周畅武高辉陈国钦修子扬姜龙涛
Owner HARBIN INST OF TECH
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