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Method for preparing complex gradient material by using cold spraying technology

A gradient material, cold spray technology, applied in the field of metal surface treatment, can solve the problem of unsuitable coating, and achieve the effect of simple process principle, simplified production process and strong adaptability

Inactive Publication Date: 2011-09-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of using this method to prepare composite gradient materials, by adjusting the scanning parameters of the electron beam, a variety of metals, non-metals, and ceramic powder gradient materials can be prepared flexibly; however, this method is deposited under vacuum, which is not suitable for Prepare large-area coatings, and some defects caused by high temperature are inevitable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The metal powder selected in this embodiment is:

[0028] Powder A is pure Al powder, the purity is greater than 99wt.%, the particle diameter is less than 45 μm, and the shape is irregular;

[0029] Powder B is pure Al powder, the purity is greater than 99.5wt.%, the average particle diameter is 58.48 μm, the particle diameter distribution is 7-174 μm, and the shape is irregular;

[0030] Powder C is Mg 17 Al 12 The powder has a purity greater than 99.5wt.%, an average particle diameter of 58.95 μm, a particle diameter distribution of 29-117 μm, and a spherical shape.

[0031] The first spraying powder of the above powder composition is 25 at.% A+75 at.% C, the second spraying powder is 50 at.% A+50 at.% C, and the third spraying powder is 100 at.% B, wherein: Mix powder A and powder B mechanically for 10-30 minutes to ensure uniform distribution. The substrate selected in this embodiment is cast AZ91D magnesium alloy, and its surface is cleaned with acetone and dr...

Embodiment 2

[0037] The metal powders used in this embodiment are two kinds of commercial pure aluminum powders, and the other powder is ceramic powder SiC. Wherein the metal aluminum powder (A and B) is the same as in Example 1; the powder C is SiC powder, the purity is greater than 99.7wt.%, the average particle diameter is 29.4 μm, the particle diameter distribution is 25-32 μm, and the shape is irregular. Wherein the first spray powder is 60at.%A+40at.%C, the second spray powder is 80at.%A+20at.%C, the third spray powder is 90at.%A+10at.%C, powder 4 is 100at .%B. The first spray powder, the second spray powder and the third spray powder need to be mechanically mixed for 10-30 minutes before spraying. The substrate is Al6061 aluminum alloy in T6 state, and the surface is cleaned with acetone and dried before spraying.

[0038] The above-mentioned mixed first spraying powder, the second spraying powder and the third spraying powder are then carried out cold spraying. The spray guns use...

Embodiment 3

[0042] Using the same powder and spraying parameters as in Example 1, the selected substrate material is SUS303 stainless steel substrate. Before spraying, 20 mesh iron silicate particles are used for sand blasting, and the surface is cleaned with acetone and dried. According to the deposition steps in Example 1, the Al-Mg gradient material can be obtained on the stainless steel substrate. The thickness of the gradient material obtained in this embodiment is about 1.14mm, the porosity is less than 1.5%, the bonding strength of the coating is 18.9±1.7MPa, and the bonding strength of the coating itself is greater than the bonding strength of the coating and the substrate at the interface .

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Abstract

The invention relates to a method for preparing a complex gradient material by using cold spraying technology, belonging to the technical field of metal surface treatment. The method comprises the following steps: spraying first spray powder on the surface of a substrate for the first time by using a stainless steel convergent-divergent spray gun; after raising the stainless steel convergent-divergent spray gun, spraying second spray powder for the second time; and finally, spraying third spray powder for the third time by using a high-heat-resistant plastic convergent-divergent spray gun, thereby preparing the complex gradient material on the surface of the substrate. The thickness of the gradient material prepared by the method provided by the invention can be adjusted within a wide range; and meanwhile, the gradient material has the advantages of low porosity, high bonding strength and no environmental pollution.

Description

technical field [0001] The invention relates to a method in the technical field of metal surface treatment, in particular to a method for preparing composite gradient materials by cold spraying technology. Background technique [0002] With the development of science and technology and the deepening of the industrialization process, more stringent requirements are put forward for the performance of materials. Gradient material is a new type of composite material developed to meet the use of materials in extreme environments. It is a high-performance material with continuous changes in composition, structure, mechanical properties and physical and mechanical properties. Although the original development purpose of the gradient material is to develop ultra-high temperature heat-resistant materials and thermal barrier materials for the aerospace field, due to its special properties, it is widely used in machinery, chemical industry, nuclear energy, optoelectronics, aerospace an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04
Inventor 卜恒勇卢晨陈彬李晓玲
Owner SHANGHAI JIAO TONG UNIV
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