A method for high-speed laser cladding TiO2 / graphene surface dual-phase reinforced ZL101

Abstract

The present invention relates to a method for high-speed laser cladding TiO2 / graphene surface dual-phase reinforced ZL101, belonging to the technical field of aluminum-based composite material preparation. The method comprises the following steps: step one, preparation of TiO2 / graphene composite material; step two, ultrasonically cleaning ZL101 powder and TiO2 / graphene composite material in a mixed solution of acetone and anhydrous ethanol respectively, filtering and vacuum drying; then fully ball-milling and mixing the treated ZL101 powder and TiO2 / graphene composite material in a vacuum ball mill; step three, high-speed laser cladding forming. The method adopts high-speed laser cladding technology, which can not only form quickly and accurately, but also generate two reinforcing phases through the reaction of laser high thermal energy to enhance the surface of ZL101 matrix. The method can realize dual-phase reinforced ZL101 matrix, improve the friction and wear performance of the surface of the aluminum-based material, and increase the service life of parts.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum-based composite material preparation, and specifically relates to a method for preparing a TiO2 composite material by high-speed laser cladding. 2 / graphene to form a dual phase and enhance the surface of ZL101 substrate. Background Art

[0002] As a new type of surface modification technology, laser cladding technology plays an important role in production and life. High-speed laser cladding technology has low heat input, high working efficiency, green and pollution-free, and is a metallurgical bonding method, which is favored. ZL101 is widely used in complex parts with medium loads due to its low density and good corrosion resistance. With the development of social science and technology, the surface of ZL101 matrix cannot meet the requirements of mechanical properties, and high-performance aluminum-based composite materials must be further explored. As the particle reinforcement phase of ZL101, such as TiC, WC, TiB 2 , Al 2 O 3 The addition of TiC can effectively form a dispersed strengthening phase, hinder the movement of dislocations, and strengthen the ZL101 matrix; while Al 2 O 3 As a reinforcing phase, it can also effectively improve the mechanical properties of the ZL101 matrix, such as wear resistance and strength. The addition of particle phase includes in-situ reaction generation and external addition. For the strengthening research of this aluminum-based composite material, many researchers have added different reinforcing particles, including TiC and Al 2 O 3 Reinforcement phase. However, the reinforcement phase generated by the in-situ reaction nucleates and grows inside the metal matrix, there is no pollution inside the reinforcement, and the particles are nanometer-level, with good compatibility with the matrix and high interface bonding strength. This is achieved by adding TiC and Al 2 O 3 Particles cannot compare. Summary of the invention

[0003] The purpose of the present invention is to provide a high-speed laser cladding TiO 2 / The method of graphene surface dual-phase enhancement ZL101, which adopts high-speed laser cladding technology, can not only form quickly and accurately, but also generate two enhanced phases, namely 3TiO 2 +4Al+3C=2Al 2 O 3 +3TiC (under high temperature) to strengthen the surface of ZL101 matrix. This method can achieve dual-phase reinforcement of ZL101 matrix, improve the friction and wear performance of the aluminum-based material surface, and increase the service life of parts.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A high-speed laser cladding TiO 2 / The method for graphene surface dual-phase enhancement ZL101 comprises the following steps:

[0006] Step 1, TiO 2 Preparation of graphene composite materials

[0007] The first step is to configure HNO in a certain proportion 3 , a mixed solution of anhydrous ethanol and deionized water;

[0008] In the second step, the graphene powder was placed in a beaker containing a mixture of anhydrous ethanol and glacial acetic acid in a certain proportion, and stirred with a glass rod. At room temperature, Ti(OC 4 H 9 ) 4 ;

[0009] The third step is to add the mixed solution prepared in the first step dropwise into the solution prepared in the second step, and continue stirring to allow the hydrolyzed TiO 2 Coated on the graphene surface;

[0010] Step 2: Mix ZL101 powder and TiO 2 The ZL101 / graphene composites were ultrasonically cleaned in a mixed solution of acetone and anhydrous ethanol, filtered and vacuum dried; then the treated ZL101 powder and TiO 2 The graphene composite material is fully ball-milled and mixed in a vacuum ball mill;

[0011] Step 3: High-speed laser cladding forming

[0012] (1) Adjust the laser power, powder feeding amount and powder feeding speed;

[0013] (2) Set the laser scanning path and set the overlap rate between layers to 50%.

[0014] Further, in step 1, HNO 3 , anhydrous ethanol, and deionized water in a volume ratio of 1:17:2.

[0015] Furthermore, in step 1, anhydrous ethanol, Ti(OC 4 H 9 ) 4 , and glacial acetic acid is 14:5:1.

[0016] Furthermore, in step 2, the volume ratio of acetone to anhydrous ethanol in the mixed solution is 1:5.

[0017] Further, in step 2, TiO 2 / graphene composite materials account for 0.1wt%~0.5wt% in the mixed powder.

[0018] Furthermore, in the step 2, the ball-to-material ratio during ball milling is 8:1, the ball milling speed is 240-300 r / min, the ball milling is 20 min, and the pause is 10 min. The total ball milling time is 1.5-2 h, and the powder particle size after ball milling is 45-90 μm.

[0019] Furthermore, in step three, the laser uses a continuous cylindrical laser beam, and its energy is considered to be uniformly distributed; the laser power is 500~2000W, the laser spot diameter is 1mm, the scanning speed is 25m / min-50m / min, and the powder feeding amount is 20g / min~40g / min.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The invention has a short preparation cycle, saves a lot of time and resources, adopts laser powder sintering for rapid forming, has high precision, stable quality and flexible forming method.

[0022] 2. The present invention can theoretically obtain the desired surface high-performance aluminum-based composite material by setting appropriate process parameters, and generate two reinforcing phases, namely 3TiO 2 +4Al+3C=2Al 2 O 3 +3TiC (under high temperature) strengthens the surface of ZL101 matrix.

[0023] 3. Under the action of laser, the reinforcing phase particles generated by in-situ reaction are small in size, have good compatibility with the matrix, and have high interface bonding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the high-speed laser cladding method. DETAILED DESCRIPTION

[0025] The technical solution and effects of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto. Example

[0026] A method for laser dual-phase strengthening of a ZL101 matrix, the method steps comprising:

[0027] Step 1, TiO 2 Preparation of graphene composite materials

[0028] Step 1: Press HNO 3, anhydrous ethanol, and deionized water in a mixing ratio of 1:17:2 to prepare a mixed solution;

[0029] In the second step, the graphene powder was placed in a beaker containing a mixture of anhydrous ethanol and glacial acetic acid in a certain proportion, and stirred with a glass rod. At room temperature, Ti(OC 4 H 9 ) 4 , among which anhydrous ethanol, Ti(OC 4 H 9 ) 4 , the volume mixing ratio of glacial acetic acid is 14:5:1;

[0030] In the third step, the mixed solution prepared in the first step is added dropwise to the mixed liquid prepared in the second step, and stirring is continued to allow the hydrolyzed TiO 2 Coated on the graphene surface;

[0031] In this step, TiO 2 In TiO 2 / The mass loading ratio in the graphene composite material is 5% to 10%; in this embodiment, 5% is preferred;

[0032] Step 2: Mix ZL101 powder and 0.2wt% TiO 2 The ZL101 / graphene composite powders were ultrasonically cleaned in a mixed solution of acetone and anhydrous ethanol in a volume ratio of 1:5, filtered and vacuum dried; then the treated ZL101 powder and TiO 2 The graphene composite material was fully milled and mixed in a vacuum ball mill. The ball-to-material ratio was 8:1, the ball milling speed was 240 r / min, the ball milling time was 20 min, the pause time was 10 min, the total ball milling time was 1.5 h, and the powder particle size after ball milling was 50 μm.

[0033] Step 3: High-speed laser cladding forming

[0034] (1) Adjust the laser power, powder feeding amount, powder feeding speed and other parameters. The laser power is 600W, the laser spot diameter is 1mm, the scanning speed is 30m / min, and the powder feeding amount is 25g / min.

[0035] (2) Set the laser scanning path and set the overlap rate between layers to 50%. Example

[0036] A method for laser dual-phase strengthening of a ZL101 matrix, the method steps comprising:

[0037] Step 1, TiO 2 Preparation of graphene composite materials

[0038] Step 1: Press HNO3 , anhydrous ethanol, and deionized water in a mixing ratio of 1:17:2 to prepare a mixed solution;

[0039] In the second step, the graphene powder was placed in a beaker containing a mixture of anhydrous ethanol and glacial acetic acid in a certain proportion, and stirred with a glass rod. At room temperature, Ti(OC 4 H 9 ) 4 , among which anhydrous ethanol, Ti(OC 4 H 9 ) 4 , the volume mixing ratio of glacial acetic acid is 14:5:1;

[0040] In the third step, the mixed solution prepared in the first step is added dropwise to the mixed liquid prepared in the second step, and stirring is continued to allow the hydrolyzed TiO 2 Coated on the graphene surface;

[0041] In this step, TiO 2 In TiO 2 / The mass loading ratio in the graphene composite material is 5% to 10%; in this embodiment, it is preferably 8%;

[0042] Step 2: Mix ZL101 powder and 0.2wt% TiO 2 The ZL101 / graphene composite powders were ultrasonically cleaned in a mixed solution of acetone and anhydrous ethanol in a volume ratio of 1:5, filtered and vacuum dried; then the treated ZL101 powder and TiO 2 The graphene composite material was fully milled and mixed in a vacuum ball mill. The ball-to-material ratio was 8:1, the ball milling speed was 280 r / min, the ball milling time was 20 min, and the pause time was 10 min. The total ball milling time was 2 h, and the powder particle size after ball milling was 80 μm.

[0043] Step 3: High-speed laser cladding forming

[0044] (1) Adjust the laser power, powder feeding amount, powder feeding speed and other parameters. The laser power is 1000W, the laser spot diameter is 1mm, the scanning speed is 40m / min, and the powder feeding amount is 35g / min.

[0045] (2) Set the laser scanning path and set the overlap rate between layers to 50%. Example

[0046] A method for laser dual-phase strengthening of a ZL101 matrix, the method steps comprising:

[0047] Step 1, TiO 2 Preparation of graphene composite materials

[0048] Step 1: Press HNO3 , anhydrous ethanol, and deionized water in a mixing ratio of 1:17:2 to prepare a mixed solution;

[0049] In the second step, the graphene powder was placed in a beaker containing a mixture of anhydrous ethanol and glacial acetic acid in a certain proportion, and stirred with a glass rod. At room temperature, Ti(OC 4 H 9 ) 4 , among which anhydrous ethanol, Ti(OC 4 H 9 ) 4 , the volume mixing ratio of glacial acetic acid is 14:5:1;

[0050] In the third step, the mixed solution prepared in the first step is added dropwise to the mixed liquid prepared in the second step, and stirring is continued to allow the hydrolyzed TiO 2 Coated on the graphene surface;

[0051] In this step, TiO 2 In TiO 2 / The mass loading ratio in the graphene composite material is 5% to 10%; in this embodiment, 10% is preferred;

[0052] Step 2: Mix ZL101 powder and 0.2wt% TiO 2 The ZL101 / graphene composite powders were ultrasonically cleaned in a mixed solution of acetone and anhydrous ethanol in a volume ratio of 1:5, filtered and vacuum dried; then the treated ZL101 powder and TiO 2 The graphene composite material was fully milled and mixed in a vacuum ball mill. The ball-to-material ratio was 8:1, the ball milling speed was 300 r / min, the ball milling time was 20 min, and the pause time was 10 min. The total ball milling time was 2 h. The powder particle size after ball milling was 90 μm.

[0053] Step 3: High-speed laser cladding forming

[0054] (1) Adjust the laser power, powder feeding amount, powder feeding speed and other parameters. The laser power is 2000W, the laser spot diameter is 1mm, the scanning speed is 50m / min, and the powder feeding amount is 40g / min.

[0055] (2) Set the laser scanning path and set the overlap rate between layers to 50%.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for high-speed laser cladding TiO2 / graphene surface dual-phase enhanced ZL101, characterized in that: The method comprises the following steps: Step 1: Preparation of TiO2 / graphene composite materials The first step is to prepare a mixed solution of HNO3, anhydrous ethanol and deionized water in a certain proportion; In the second step, the graphene powder is placed in a beaker containing a mixture of anhydrous ethanol and glacial acetic acid in a certain proportion, and stirred with a glass rod. At room temperature, Ti(OC4H9)4 solution is added dropwise; The third step is to add the mixed solution prepared in the first step dropwise into the solution prepared in the second step, and continue stirring so that the hydrolyzed TiO2 is coated on the surface of the graphene; Step 2: ultrasonically clean the ZL101 powder and the TiO2 / graphene composite material in a mixed solution of acetone and anhydrous ethanol, filter and vacuum dry; then fully ball-mill and mix the treated ZL101 powder and the TiO2 / graphene composite material in a vacuum ball mill; Step 3: High-speed laser cladding forming (1) Adjust the laser power, powder feeding amount and powder feeding speed; (2) Setting the laser scanning path and setting the overlap rate between layers to 50%; In the step 1, the volume ratio of HNO3, anhydrous ethanol and deionized water is 1:17:2; In the step 1, the volume ratio of anhydrous ethanol, Ti(OC4H9)4 and glacial acetic acid is 14:5:1; In the step 1, the mass loading ratio of TiO2 in the TiO2 / graphene composite material is 5% to 10%; In the step 2, the TiO2 / graphene composite material accounts for 0.1wt% to 0.5wt% in the mixed powder; In the step three, the laser uses a continuous cylindrical laser beam, and its energy is considered to be uniformly distributed; the laser power is 500-2000W, the laser spot diameter is 1mm, the scanning speed is 25m / min-50m / min, and the powder feeding amount is 20g / min-40g / min.

2. The method of high-speed laser cladding TiO2 / graphene surface dual-phase enhanced ZL101 according to claim 1, characterized in that: In the step 2, the volume ratio of acetone to anhydrous ethanol in the mixed solution is 1:

5.

3. The method for high-speed laser cladding TiO2 / graphene surface dual-phase enhanced ZL101 according to claim 1, characterized in that: In the step 2, the ball-to-material ratio during ball milling is 8:1, the ball milling speed is 240-300 r / min, the ball milling is 20 min, and the pause is 10 min. The total ball milling time is 1.5-2 h, and the powder particle size after ball milling is 45-90 μm.

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