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Al-W composite material with gradient changing density and its preparation method

A composite material and density gradient technology, used in chemical instruments and methods, heating inorganic powder coating, layered products, etc. Increased density, uniform distribution and good repeatability

Inactive Publication Date: 2008-03-26
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the physical vapor deposition method can easily prepare the deposited film of multi-layer substances, but this method can only obtain thin deposited films, and the deposition speed is relatively slow and the efficiency is low; the powder metallurgy method is to press the prefabricated powder and then sinter The product is obtained with a simple process, but the sintering density of this method is not high enough and the porosity is high; spark plasma sintering is a new method developed in recent years, which uses a large pulse current to heat through a conductive mold and a sample to complete sintering. It has the characteristics of rapid heating and concentration, but the sintering process is not easy to control and may generate some unfavorable phases

Method used

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  • Al-W composite material with gradient changing density and its preparation method
  • Al-W composite material with gradient changing density and its preparation method
  • Al-W composite material with gradient changing density and its preparation method

Examples

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Effect test

preparation example Construction

[0023] A preparation method of an Al-W composite material with a density gradient change, comprising the following preparation steps:

[0024] Step 1: Prepare raw materials

[0025] Mix Al powder with a particle size of 10-50 μm and W powder with a particle size of less than 3 μm evenly according to different target components to obtain mixed powders with different W contents; then dry the mixed powders with different W contents in a vacuum oven at 50-85°C for 30- Raw materials with different target components were prepared after 90 minutes;

[0026] The second step: Spraying Al-W composite materials with different W content

[0027] Put the raw materials of different target components obtained in the first step into the powder feeder 2 of the spraying equipment, adjust the spraying process parameters, and prepare Al-W composite materials with different densities at room temperature of 18-25°C;

[0028] The process parameters of spraying the first layer are: the working temp...

Embodiment 1

[0044] Example 1: Fabrication of Al-W composites with three-layer structure

[0045] Referring to Fig. 2, the weight percentages of W content in the Al-W composite material with three-layer structure are 94.4%, 63.9%, and 35.5%, respectively. Its preparation process includes the following steps:

[0046] Step 1: Prepare raw materials

[0047] According to the target components with W weight percentage content of 94.4%, 63.9%, and 35.5%, the Al powder with a particle size of 10 μm and the W powder with a particle size of 3 μm are uniformly mixed to obtain a mixed powder with a W content of 94.4%, and a W powder with a W content of 63.9%. Mixed powder, mixed powder with a W content of 35.5%; then (the above mixed powder) mixed powder with a W content of 94.4%, mixed powder with a W content of 63.9%, and mixed powder with a W content of 35.5% are dried in a vacuum oven at 85°C After 30 minutes, raw materials containing 94.4% W, raw materials containing 63.9% W, and raw materia...

Embodiment 2

[0059] Example 2: Fabrication of Al-W composites with five-layer structure

[0060] Referring to Fig. 1, the weight percentages of W content in the five-layer Al-W composite material are 92.2%, 87.5%, 79.7%, 70.3%, and 48.8%, respectively. Its preparation process includes the following steps:

[0061] Step 1: Prepare raw materials

[0062] According to the W weight percentage content of 92.2%, 87.5%, 79.7%, 70.3%, 48.8% target components, the Al powder with a particle size of 50 μm and the W powder with a particle size of 1 μm are uniformly mixed to obtain a mixed powder with a W content of 92.2%, W Mixed powder with a content of 87.5%, mixed powder with a W content of 79.7%, mixed powder with a W content of 70.3%, and mixed powder with a W content of 48.8%; Mixed powder, mixed powder with W content of 79.7%, mixed powder with W content of 70.3%, and mixed powder with W content of 48.8% were dried in a vacuum oven at 50°C for 90 minutes to obtain a raw material with a W co...

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Abstract

The multilayer composite Al-W material with gradient density consists of N layers in densities of 12.0-13.9 g / cu cm, 10.0-12.0g / cu cm, 8.0-10.0g / cu cm, 5.5-8.0g / cu cm ... 2.9-5.5g / cu cm separately. It is prepared through spraying of mixture powder in different W contents, and the spraying process has no oxidation of Al and W, no generation of other phase, and controllability of the composite material density and thickness.

Description

technical field [0001] The invention relates to a composite material and a preparation method of the composite material, more particularly, to an Al-W composite material with a density gradient change, and a spraying preparation method of the Al-W composite material. Background technique [0002] Functionally graded materials (Functionally Graded Materials: FGM) refer to a class of heterogeneous composite materials whose properties are gradually changed corresponding to the changes in structure and composition through continuous or quasi-continuous changes in structure and composition. With the development of science and technology and modern industrial technology, people have higher and higher requirements for material performance. In order to make better use of the advantages of various materials, the research and preparation of new composite materials has become an important branch in the field of materials science and engineering. Gradient composite material means that ...

Claims

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Application Information

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IPC IPC(8): B32B5/14B32B15/01C23C24/08
Inventor 张涛田刚焦立波马朝利
Owner BEIHANG UNIV
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