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Nickel-plating boron carbide/aluminum composite coating as well as preparation method and application

A boron carbide and aluminum composite technology, which is applied in the field of materials, can solve the problems of increased spraying cost, poor wettability, and inability to prepare high-boron carbide composite coatings, and achieves the goals of reducing spraying costs, reducing costs, and good electron radiation absorption performance Effect

Inactive Publication Date: 2010-03-31
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high melting point of boron carbide, high-density coatings cannot be obtained even with plasma spraying technology. To obtain high-density sprayed boron carbide coatings, some additional devices must be added, such as high-voltage equipment, electromagnetic Acceleration equipment, the existence of these additional mechanisms will greatly increase the cost of spraying
In addition, due to the poor wettability between boron carbide and aluminum, it is impossible to prepare a composite coating with high boron carbide content by directly mixing boron carbide particles with aluminum powder for spraying.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: 2300g of raw material boron carbide (particle size 150 mesh) is subjected to pre-plating treatment (oxidation at 500°C for 0.5h); then electroless nickel plating is used, and the plating solution formula is: NiSO 4 2H 2 O 35g / L, NaH 2 PO 2 ·H 2 O 28g / L, NH 4 Cl 30g / L and Na 3 C 6 h 5 o 7 2H 2 O 20g / L. The pH value of the plating solution is 11, the plating time is 9min, the plating temperature is 60±1°C, the thickness of the plating layer is 8μm, and the total weight is 2500g. After preparing nickel-plated boron carbide particles and 2130g aluminum powder (particle size: 160 mesh), use absolute ethanol as the medium, put it on a magnetic stirrer to stir evenly, stir for 1h, filter, and place the mixed powder in the air Naturally air-dried to obtain the coating of the present invention. Finally, the nickel-plated boron carbide / aluminum composite coating of the present invention is sprayed onto a 1 mm aluminum substrate by plasma spraying technology ...

Embodiment 2

[0030] Example 2: 1840g of raw material boron carbide (250 meshes in particle size) is subjected to pre-plating treatment (oxidized for 1h at 700°C); then electroless nickel plating is used, and the plating solution formula is: NiSO 4 2H 2 O 45g / L, NaH 2 PO 2 ·H 2 O 35g / L, NH 4 Cl 45g / L and Na 3 C 6 h 5 o 7 2H 2 O 27g / L. The pH value of the plating solution is 10, the plating time is 8min, the plating temperature is 80±1°C, the thickness of the plating layer is 6μm, and the total weight is 2000g. After preparing nickel-plated boron carbide particles and 530g aluminum powder (grain size: 250 mesh), use absolute ethanol as the medium, put it on a magnetic stirrer to stir evenly, stir for 2 hours, filter, and place the mixed powder in the air naturally Air-dried to obtain the coating of the present invention. Finally, the nickel-plated boron carbide / aluminum composite coating of the present invention is sprayed onto a 1mm aluminum substrate by plasma spraying technolog...

Embodiment 3

[0033] Example 3: 1610g of raw material boron carbide (200 meshes in particle size) is subjected to pre-plating treatment (oxidized for 1h at 600°C); then electroless nickel plating is used, and the plating solution formula is: NiSO 4 2H 2 O 40g / L, NaH 2 PO 2 ·H 2 O 32g / L, NH 4 Cl 40g / L and Na 3 C 6 h 5 o 7 2H 2 O 24g / L. The pH value of the plating solution is 9, the plating time is 7min, the plating temperature is 70±1°C, the thickness of the plating layer is 5μm, and the total weight is 1710g. After preparing nickel-plated boron carbide particles and 805g aluminum powder (particle size 200 mesh), use absolute ethanol as the medium, put it on a magnetic stirrer to stir evenly, stir for 1.5h, filter, and place the mixed powder in the air Naturally air-dried to obtain the coating of the present invention. Finally, the nickel-plated boron carbide / aluminum composite coating of the present invention is sprayed onto a 1mm aluminum substrate by plasma spraying technology ...

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Abstract

The invention provides a nickel-plating boron carbide / aluminum composite coating, comprising the components of 54-79 percent by weight of nickel-plating boron carbide particles and 21-46 percent by weight of aluminum powder. The invention also provides a preparation method, which comprises the steps of mixing the nickel-plating boron carbide particles and the aluminum powder through pre-treating the nickel-plating boron carbide particles and carrying out chemical nickel-plating surface modification to obtain the nickel-plating boron carbide / aluminum composite coating; and the invention furtherrelates to the application of the nickel-plating boron carbide / aluminum composite coating sprayed on a matrix and used as a space protective coating layer to manufacture a novel space protective material with the nickel-plating boron carbide / aluminum composite coating. The invention has the advantages that a coating layer with the high boron carbide content is prepared by means of normal flame spraying or plasma spraying through carrying out surface modification treatment on the boron carbide particles, therefore, the spraying cost is greatly reduced, and the nickel-plating boron carbide / aluminum composite coating has light characteristic and favorable electron radiation absorption performance.

Description

technical field [0001] The invention relates to the field of materials, in particular to a nickel-plated boron carbide / aluminum composite coating, its preparation method, its application as a space protection coating and a space protection material with the coating. Background technique [0002] The low earth orbit is 100km-1000km from the ground, and it is the operating area of ​​spacecraft such as earth observation satellites, meteorological satellites, and space stations. The space environment in this orbital area is very harsh, and there are many factors that damage the spacecraft, such as the corrosion of the surface of materials by atomic oxygen; the degradation of organic materials by space electrons and proton radiation; the radiation damage of materials and electronic devices caused by cosmic rays; the radiation damage of the earth With electrical interference to spacecraft, etc. With the increasing development and utilization of space resources, higher requirement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/32C23C18/36C23C4/04G21F1/00
Inventor 马欣新唐光泽郭光伟
Owner HARBIN INST OF TECH
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