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Low-expansion wear-resistant composite coating on the surface of aluminum-based composite materials and its preparation method

An aluminum-based composite material and composite coating technology, which is applied in the direction of metal material coating process, coating, liquid chemical plating, etc., can solve problems such as unstable compressor life, abrasive particles scratching the rotor, and nickel coating blistering , to achieve good wear resistance, prolong service life and enhance durability

Active Publication Date: 2018-03-16
有研金属复材技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The coatings of existing aluminum-based blades mostly use high hardness (HV 0.1 1500) nickel coating to achieve wear resistance, but the expansion coefficient of the nickel coating itself (generally 1.5X10 -6 / K) and aluminum matrix composite material (1.1X10 -6 The expansion coefficient of / K) does not match, so the nickel coating is prone to foaming; at the same time, the internal stress and high hardness of the nickel coating itself cannot be completely released, so that the nickel coating is easily broken during the work of the aluminum matrix composite material, and the formed abrasive particles are often Scratch the rotor, resulting in unstable life of the compressor

Method used

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  • Low-expansion wear-resistant composite coating on the surface of aluminum-based composite materials and its preparation method
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Embodiment 1

[0028] 1. Preparation of chemical plating solution: according to nickel chloride 10g / L, cobalt chloride 10g / L, sodium hypophosphite 20g / L, potassium sodium tartrate 10g / L, sodium citrate 20g / L, ammonium chloride 30g / L, The ratio of cerium sulfate 1g / L and saccharin 0.01g / L was used to prepare the electroless plating solution, and its pH value was adjusted to 10.

[0029] 2. Preparation of wear-resistant particle slurry: Take 10 g of silicon nitride with a particle size of 0.2 μm, add 100 mL of water, and stir ultrasonically for 30 min.

[0030] 3. Plating: Take the silicon-aluminum composite material with a silicon content of 10% as a sample, firstly treat the silicon-aluminum composite material sample after degreasing, pickling roughening, two-step zinc dipping, etc., and then immerse it in a temperature of 95 React in the electroless plating solution at ℃, 30s after the reaction starts, add 30ml / L of wear-resistant particle slurry to form a plating solution; every 15min, adj...

Embodiment 2

[0033] 1. Preparation of chemical plating solution: nickel sulfate 50g / L, cobalt sulfate 50g / L, sodium hypophosphite 50g / L, sodium citrate 70g / L, potassium sodium tartrate 30g / L, ammonium sulfate 100g / L, cerium sulfate 10g / L, the proportioning of thiourea 0.05g / L prepares electroless plating solution, adjusts its pH value to be 10.

[0034] 2. Preparation of wear-resistant particle slurry: take 20 g of silicon nitride with a particle size of 5 μm, add 100 mL of water, and stir ultrasonically for 30 min.

[0035] 3. Plating: Take the silicon-aluminum composite material with a silicon content of 50% as the sample, firstly degrease the silicon-aluminum composite material sample, pickle roughening, two-step zinc dipping, etc., and then immerse the sample in a temperature of 75 React in the electroless plating solution at ℃. After 60 seconds of the reaction, add 50ml / L of wear-resistant particle slurry to form a plating solution; Composite coating of 20μm. Scanning electron micr...

Embodiment 3

[0038] 1. Prepare chemical plating solution: prepare chemical plating solution according to the proportion of nickel sulfate 25g / L, cobalt sulfate 25g / L, sodium hypophosphite 30g / L, sodium citrate 60g / L, ammonium sulfate 50g / L, adjust its The pH value is 10.

[0039] 2. Preparation of wear-resistant particle slurry: Take 100 g of silicon nitride with a particle size of 0.8 μm, add 100 mL of water, and stir ultrasonically for 30 min.

[0040] 3. Plating: Taking the silicon-aluminum composite material with a silicon content of 20% as a sample, the silicon-aluminum composite material sample is firstly treated by degreasing, pickling roughening, two-step zinc dipping, etc., and then dipped in a temperature of 90 React in an electroless plating solution at ℃. After 30 seconds of the reaction, add 100ml / L of wear-resistant particle slurry to form a plating solution. Adjust the pH value of the plating solution to 9-10 every 15 minutes, and apply plating for 1 hour to obtain the thick...

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Abstract

The invention discloses low-expansion abrasion-resistant composite plating on the surface of an aluminum-based composite material and a preparation method of the low-expansion abrasion-resistant composite plating and belongs to the technical field of metal surface treatment. The thickness of the composite plating is 10 to 20 [mu]m and the composite plating is composed of, 20 wt.%-75 wt.% of nickel, 20 wt.%-70 wt.% of cobalt, 0.5 wt.%-5 wt.% of phosphorus, 1 wt.%-8 wt.% of abrasion-resistant particles and 0-8 wt.% of rare earth metal. The aluminum-based composite material is plated in a plating solution formed by mixing a prepared chemical plating solution and abrasion-resistant particle slurry to obtain the composite plating. The composite plating has good abrasion resistance, corrosion resistance and low expansibility, the effect that an aluminum-based composite material blade has good binding force with the composite plating during operation of a compressor is ensured, and the phenomena of cracking, swelling and falling of the composite plating do not occur, so that the durability of the aluminum-based composite material blade is improved and the service life of the aluminum-alloy revolving-blade type compressor for an automobile air conditioner is prolonged.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a low-expansion wear-resistant composite coating on the surface of an aluminum-based composite material and a preparation method thereof. Background technique [0002] The rotary vane compressor is mainly composed of cylinder, rotor piston, blade and main shaft. During the working process of the rotary vane compressor, the blades are constantly rubbing against the surface of the rotor gap and the surface of the cavity, so the materials of the rotor and the blades must have good wear resistance; at the same time, the operating temperature of the compressor is generally kept at 100-200°C, so the rotor and blade materials are required to have good dimensional thermal stability, that is, low expansion coefficient; in addition, during the operation of the compressor, water is easily brought into the system and combined with the refrigerant to form A medium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/48C23C18/50
CPCC23C18/48C23C18/50
Inventor 赵月红聂俊辉刘彦强郝心想樊建中马自力魏少华左涛
Owner 有研金属复材技术有限公司