A high-aluminum bronze coating for volumetric damage repair and its preparation method

A high-aluminum bronze, damage repair technology, applied in coating, metal material coating process, fusion spraying and other directions, can solve the problems of large thermal stress, large coating thickness, high oxidation degree of high-aluminum bronze coating, and achieve Avoid the effects of oxidation and phase transitions

Active Publication Date: 2017-05-17
ACADEMY OF ARMORED FORCES ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to provide a low oxidation degree, thermal stress Smaller, thicker high-alumina bronze coatings for volumetric damage repair

Method used

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  • A high-aluminum bronze coating for volumetric damage repair and its preparation method
  • A high-aluminum bronze coating for volumetric damage repair and its preparation method
  • A high-aluminum bronze coating for volumetric damage repair and its preparation method

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Embodiment 1）

[0024] For the high-aluminum bronze coating used for volumetric damage repair in this embodiment, see Figure 7 , and its thickness is 3mm.

[0025] The preparation method of the high-alumina bronze coating for volume damage repair in this embodiment is as follows:

[0026] ① Use gas-atomized high-alumina bronze powder with a particle size of 15 μm to 45 μm as the spraying powder, and first place it in an oven at 120°C for 3 hours; set aside.

[0027] The chemical composition of the gas-atomized high-alumina bronze powder used in this example is as follows: Al: 13.30wt%, Fe: 4.93wt%, Mn: 1.62wt%, Zn: 0.33wt%, Ni: 0.31wt%, Co: 5.49wt%, Cu balance.

[0028] ② Degreasing, derusting, and sandblasting roughening pretreatment on the surface of the copper alloy substrate, and cleaning the surface of the substrate with acetone.

[0029] The copper alloy base material used in this embodiment is H62 brass, and the size is 20mm×20mm×10mm.

[0030] The sandblasting roughening process ...

Embodiment 2～ Embodiment 4）

[0035] Each embodiment is basically the same as Embodiment 1, except that the propane pressure, flame temperature and spray particle temperature are different, see Table 1 for details.

[0036] Table 1

[0037] Example 1 Example 2 Example 3 Example 4 propane pressure 68PSI 72PSI 76PSI 80PSI Flame temperature 630℃ 700℃ 780℃ 850℃ Spray particle temperature 350℃ 390℃ 430℃ 480℃

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Abstract

The invention discloses a high-alumina bronze coating for repairing volume damage and a preparation method of the high-alumina bronze coating. The thickness of the high-alumina bronze coating can reach 2.5-4mm, the high-alumina bronze coating is prepared by means of coating the surface of a copper alloy matrix by using gas-atomization high-alumina bronze powder through a low-temperature supersonic spraying technology, the temperature of flame flow in the low-temperature supersonic spraying technology is only 600-900 DEG C, dimethylmethane serves as main gas, compressed air serves as oxidant gas, hydrogen serves as reducing gas, and nitrogen serves as power conveying carrier gas; and technological parameters of coating include that air pressure is 90 PSI, the pressure of the dimethylmethane is 68-80PSI, the flow of the hydrogen is 40L/min, the flow of the nitrogen is 40L/min, and the spraying distance is 140mm. The prepared high-alumina bronze coating is low in oxidation degree, low in thermal stress and large in thickness; and large-sized volume damage caused by severe wear of aluminum alloy parts of equipment can be repaired.

Description

technical field [0001] The invention belongs to the technical field of supersonic spraying, and in particular relates to a high-aluminum bronze coating used for volume damage repair and a preparation method thereof. Background technique [0002] Aluminum bronze refers to a copper-based alloy with aluminum as the main additive element, and its aluminum content generally does not exceed 11.5%, while high-aluminum bronze refers to aluminum bronze with an aluminum content of more than 11.5% and less than 15%. [0003] Aluminum bronze has the advantages of high strength, corrosion resistance, wear resistance, and no sparks during impact. It can be applied to ship propellers, brake wheels and other parts that are easy to wear and tear. However, due to the physical and chemical characteristics of aluminum bronze itself, there are some technical bottlenecks in the processing and molding process. On the one hand, the solidification range of aluminum bronze is narrow and easy to form ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/01C23C4/08C23C4/129B22F1/00
Inventor 朱胜王晓明周超极刘玉欣赵阳韩国峰李华莹王启伟任智强
Owner ACADEMY OF ARMORED FORCES ENG PLA
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