Adjustable and controllable Al-based composite coating with wear resistance, shock absorption and ablation resistance and cold spraying preparation method thereof

Abstract

The invention relates to an adjustable Al-based composite coating with wear resistance, shock absorption and ablation resistance and a cold spraying preparation method thereof. The composite coating comprises the following chemical components in percentage by volume: 3-15% of Al2O3, 10-25% of Cr2AlC and the balance of Al, and the sum of all the components is 100%. Raw material powder of the composite coating comprises the following chemical components in percentage by volume: 5-20% of Al2O3, 15-30% of Cr2AlC and the balance of Al powder, and the sum of the three components is 100%. In addition, the particle size of raw material powder of the composite coating is Al powder; the aluminum oxide accounts for 15-45 mu m, the Al2O3 accounts for 15-45 mu m, and the Cr2AlC accounts for 15-45 mu m. The preparation method comprises the following steps: weighing Al2O3, Cr2AlC and Al powder according to a required ratio; putting the raw material powder into a planetary ball mill for ball milling and full mixing; the steel plate base body is placed in a muffle furnace to be preheated to 100 DEG C after being cleaned, dried and subjected to sand blasting, and heat preservation is conducted for 5 min; and the composite raw material powder is placed on a powder feeder of cold spraying equipment, the preheated steel plate base body is fixed to the cold spraying equipment through a clamp, proper spraying parameters are selected, cold spraying preparation is conducted, and finally the composite coating is obtained.

Description

TECHNICAL FIELD

[0001] The application relates to an Al-based composite coating with wear resistance, shock resistance, ablation resistance and controllability and a cold spraying preparation method thereof. BACKGROUND

[0002] With the continuous updating of shipboard aircraft models and the continuous improvement of performance, more stringent requirements are put forward for the performance of the ship flight deck. Due to the particularity and complexity of the marine environment, the deck surface is subjected to salt spray, wave scouring, dry-wet cycling and the like. In addition, the shipboard aircraft take-off and landing area also needs to withstand high-temperature flame ablation and scouring and the like extreme working conditions. Therefore, the deck surface needs to have good wear resistance and anti-skid performance, and the deck surface needs to be corrosion-resistant, and the heavy equipment placed on the deck surface needs to be prevented from sliding even in harsh sea conditions. Even if it is severely worn, it still needs to have high friction resistance and shock resistance. In addition, the shipboard aircraft take-off and landing area also needs to withstand high-temperature flame ablation and scouring and the like extreme working conditions. With the development of shipboard aircraft, higher performance requirements are put forward for the take-off and landing area deck. Therefore, the deck surface needs to have excellent comprehensive performance, including anti-skid, wear resistance, ablation resistance and the like.

[0003] It is a feasible method to use a coating to improve the friction, shock resistance and ablation resistance, and relevant research has been highly concerned by the state. At present, surface manufacturing technologies such as roll coating and thermal spraying are mainly used to strengthen and protect the deck surface to improve its anti-skid, corrosion resistance, wear resistance and ablation resistance and the like. At present, the deck surface mainly uses a polymer-based anti-skid coating, which has good adhesion, good wear resistance and corrosion resistance. Therefore, the ship deck surface must have a longer service life and higher reliability.

[0004] At present, the polymer-based coating still has the shortcomings of short service life, poor adhesion, poor corrosion resistance and poor high and low temperature resistance during service, and harmful gases are generated after aging and decomposition. Especially in the special areas such as the take-off area, the landing area, the deflector and the vertical take-off and landing area of the ship deck, the polymer-based coating is prone to have a sharp decrease in the friction coefficient, surface ablation damage and large-area peeling and the like. Al is a material with low density, high electrical conductivity and high thermal conductivity, and is widely used in coatings. However, pure Al is soft, and it is difficult to improve the wear resistance of the deck, the friction coefficient is difficult to meet the requirements, and the adhesion strength is low. Therefore, ceramic is added to form a composite material to improve its performance. Al2O3 ceramic has high hardness and high melting point, and can significantly improve the hardness of the coating, improve the friction resistance of the coating and reduce the wear rate of the coating. The density of Al2O3 is 3.92-3.98 g / cm 3 , the Young's modulus is 300-380 GPa, and the room temperature fracture toughness is 3-4 MPa·m 1 / 2The new ternary layered MAX phase ceramic is a good damage tolerance ceramic material with high strength and high toughness and excellent conductive performance of metal-like, high heat resistance, excellent wear resistance, self-lubricating performance, and good combination with a metal matrix. Typical materials are Ti2AlC, Ti3AlC2 and Ti3SiC2, with a density of 4-5 g / cm 3 , a Young's modulus of 280-340 GPa, and a room temperature fracture toughness of 6.0-7.88 MPa·m 1 / 2 . The focus of the patent is to regulate the content of Al2O3 and Cr2AlC in the Al-based coating and the cold spraying process parameters. SUMMARY The Al-based composite coating has the characteristics that the chemical composition of the composite coating is as follows: Al2O3: 3-15%, Cr2AlC: 10-25%, and the rest is Al, and the sum of the components is 100%.

[0005] The Al2O3-Cr2AlC-Al-based composite coating of the application has the following raw material powder composition: The chemical composition of the composite coating raw powder is as follows: Al2O3: 5-20%, Cr2AlC: 15-30%, and the rest is Al powder, and the sum of the three components is 100%. In addition, the particle size of the composite coating raw powder is as follows: Al powder: 15-45 μm, Al2O3: 15-45 μm, and Cr2AlC: 15-45 μm.

[0006] The Al2O3-Cr2AlC-Al-based composite coating of the application has the following mechanical properties: The microhardness of the composite coating is 45-52 HV, and the tensile interfacial bonding strength of the composite coating is 40-45 MPa.

[0007] The application has the following beneficial effects: The application can be used on the deck surface to improve the frictional resistance, shock absorption characteristics and anti-ablation performance of the deck surface. The service life of the deck surface coating can be improved, the maintenance frequency can be reduced, and the use cost can be reduced.

[0008] The preparation method of the application comprises the following steps: Step 1: The composite coating raw powder is prepared according to the ratio and particle size of claim 2, including Al2O3, Cr2AlC and pure Al raw powder, and all of which are commercial powders. The above three kinds of raw powder are placed in a planetary ball mill for ball milling for 6-8 h to achieve full mixing. Step 2, the composite coating of claim 1 uses a steel plate as a substrate, the substrate is deoiled with acetone and is subjected to surface activation treatment by sand blasting, the substrate is preheated to 100 DEG C in a muffle furnace and is kept for 5 min; Step 3, the powder of claim 2 should be subjected to drying treatment at 70 DEG C before use, and the drying time is not less than 30 min; Step 4, the composite raw material powder of claim 2 is placed in a powder feeder of a cold spraying device, the preheated steel plate substrate is fixed on the cold spraying device by a clamp, and then cold spraying composite coating preparation is carried out, and the specific spraying parameters are as follows: gun chamber pressure 5 MPa, gun chamber temperature 450 DEG C, powder feeding speed 5 r / min, gun walking speed 300 cm / min, and scanning interval 1 mm; Step 5, the final composite coating has a thickness of 0.4-1.5 mm. BRIEF DESCRIPTION OF DRAWINGS Figure 1 4vol.%Al2O3 / 15 vol.% Cr2AlC / 81 vol.% Al composite coating scanning electron microscope image Figure 2 7vol.%Al2O3 / 16 vol.% Cr2AlC / 77 vol.% Al composite coating scanning electron microscope image Figure 3 9vol.%Al2O3 / 18 vol.% Cr2AlC / 74 vol.% Al composite coating scanning electron microscope image The application is implemented by the following technical solutions The application provides an Al-based composite coating with wear resistance, shock resistance, ablation resistance and controllability and a cold spraying preparation method thereof, and the application is described in detail below with reference to the drawings and examples, but the application is not limited thereto Example 1 According to the mass percentage of the composite coating raw material powder, Al2O3 is 10%, Cr2AlC is 20%, and Al powder is 70%, and the sum of the three components is 100%, and the required powder is weighed; the above three raw material powders are placed in a planetary ball mill for 8 h to achieve full mixing; the steel plate substrate is cleaned with acetone and is subjected to surface sand blasting and is then placed in a muffle furnace and is preheated to 100 DEG C and is kept for 5 min; the mixed powder is dried for 30 min, and then the preheated steel plate substrate is fixed on the cold spraying device by a clamp, and then cold spraying is carried out according to the cold spraying parameter range of claim 5, and the appropriate cold spraying parameters are selected, and finally the composite coating is obtained, as shown in Figure 1 .

[0009] Example 2 Weigh the required powder according to the mass percentage of the composite coating raw material powder: Al2O3: 15%, Cr2AlC: 25%, Al powder: 60%, with the sum of the three components being 100%. Place the above three raw material powders in a planetary ball mill and ball mill for 8 hours to achieve thorough mixing. Clean the steel plate substrate with acetone and perform surface sandblasting, then preheat it to 100°C in a muffle furnace and hold for 5 minutes. Dry the above mixed powder for 30 minutes and place it in the powder feeder of a cold spraying equipment. Fix the preheated steel plate substrate onto the cold spraying equipment using clamps. Select appropriate cold spraying parameters according to the cold spraying parameter range described in claim 5, and then perform cold spraying to finally obtain the composite coating. Figure 2 As shown.

[0010] Example 3 Weigh the required powder according to the mass percentage of the composite coating raw material powder: Al2O3: 20%, Cr2AlC: 30%, Al powder: 50%, with the sum of the three components being 100%. Place the above three raw material powders in a planetary ball mill and ball mill for 8 hours to achieve thorough mixing. Clean the steel plate substrate with acetone and perform surface sandblasting, then preheat it to 100°C in a muffle furnace and hold for 5 minutes. Dry the above mixed powder for 30 minutes and place it in the powder feeder of a cold spraying equipment. Fix the preheated steel plate substrate onto the cold spraying equipment using clamps. Select appropriate cold spraying parameters according to the cold spraying parameter range described in claim 5, and then perform cold spraying to finally obtain the composite coating. Figure 3 As shown.

Claims

1. An Al-based composite coating that is wear-resistant, shock-absorbing, ablation-resistant, and adjustable, and its cold spray preparation method, characterized in that, The chemical composition of the composite coating is as follows (by mass percentage): Al2O3: 3-15%, Cr2AlC: 10-25%, with the remainder being Al, and the sum of all components is 100%.

2. The Al2O3-Cr2AlC-Al-based composite coating according to claim 1, characterized in that, The composite coating raw material powder contains three raw materials: Al2O3: 5-20%, Cr2AlC: 15-30%, and the remainder is Al powder. The sum of the three components is 100%. In addition, the particle size of the composite coating raw material powder is: Al powder: 15-45 μm, Al2O3: 15-45 μm, Cr2AlC: 15-45 μm.

3. The Al2O3-Cr2AlC-Al-based composite coating according to claim 1, characterized in that, The microhardness of the composite coating is 45-52 HV, and the tensile interfacial bonding strength of the composite coating is 40-45 MPa.

4. A method for preparing the Al2O3-Cr2AlC-Al-based composite coating as described in claim 1, characterized in that, The method includes the following steps: Step 1: Prepare composite coating raw material powder according to the ratio and particle size described in claim 2, including Al2O3, Cr2AlC and Al powder, all of which are commercial powders. Place the above three raw material powders in a planetary ball mill and ball mill for 6-8 hours to achieve full mixing. Step 2: The composite coating described in claim 1 uses a steel plate as the substrate. The substrate is degreased with acetone and surface active treatment is performed by sandblasting. The substrate is placed in a muffle furnace and preheated to 100°C and held for 5 minutes. Step 3: The powder described in claim 2 shall be dried at 70°C before use, and the drying time shall not be less than 30 min. Step 4: Place the composite raw material powder as described in claim 2 into the powder feeder of the cold spraying equipment, fix the preheated steel plate substrate onto the cold spraying equipment using a clamp, and then prepare the cold spraying composite coating. The specific spraying parameters are as follows: gun chamber pressure 5MPa, gun chamber temperature 450℃, powder feeding speed 5r / min, gun travel speed 300cm / min, scanning interval 1mm. Step 5, the final composite coating thickness is 0.4~1.5 mm.

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