CN102995005B - Method for strengthening laser induced metal surface layer composite TiCN by using TiO2, isopropylamine, carbon black, methanol and nitrogen as components - Google Patents

Abstract

The invention discloses a method for strengthening a laser induced metal surface layer composite TiCN by using TiO2, isopropylamine, carbon black, methanol and nitrogen as components, and relates to the technical field of strengthening treatment on metal surfaces. A mixture of the TiO2, the isopropylamine and carbon black is applied to the metal surface, and the metal surface applied with the mixture is scanned by a laser beam in a co-existence of the methanol and the nitrogen. By adopting the method, TiCN is generated by in-situ compounding of the metal surface layer, so that the strengthening to the metal surface and the abrasion resistance are realized.

Description

Laser-induced Metal Surface Composite TiCN Strengthening Method Using TiO2, Isopropylamine, Carbon Black, Methane, and Nitrogen as Components

technical field

The invention relates to the technical field of metal surface strengthening treatment.

Background technique

Titanium carbide nitride (TiCN) is a non-oxide material with excellent performance and wide application. It is also a coating material with excellent performance. It is an infinite solid solution of titanium carbide and titanium nitride. It has both titanium carbide and titanium nitride. It has the advantages of high hardness, wear resistance, corrosion resistance, oxidation resistance, etc., and has good thermal conductivity, electrical conductivity and chemical stability. It is widely used in cutting tools, powder metallurgy and cermet products. It is the current research and development One of the most widely used thin film materials.

The preparation technologies of TiCN coating are mainly chemical vapor deposition (CVD) and physical vapor deposition (PVD). The deposition temperature of the CVD method is high, which exceeds the heat treatment temperature of most steel materials, and CVD uses chlorides as raw materials, and requires a set of equipment for preparing Ti-containing halide gases. The process is complicated and the cost is high, which is different from the currently advocated green industry contradict. The PVD method has a lower formation temperature, a thinner coating, and a lower bonding strength with the substrate. The coating is easy to peel off from the substrate, and the coating is poor.

Regardless of the CVD or PVD method, the TiCN coating obtained is relatively thin, with a thickness of only a few microns (μm), and the coating is mechanically bonded to the substrate, and the strength of the bonding surface is low, and the coating is prone to peeling off during use.

Contents of the invention

The purpose of the present invention is to provide a laser-induced metal surface composite TiCN strengthening method with TiO ₂ , isopropylamine, carbon black, methane, and nitrogen as components, which can make the metal surface layer composite in situ to generate TiCN, thereby strengthening the metal surface. Strengthen and improve wear resistance.

The present invention is achieved through the following technical solutions:

A mixture of TiO ₂ , isopropylamine and carbon black is coated on the metal surface, and a laser beam is used to scan the metal surface coated with the mixture under the coexistence of methane and nitrogen.

Through the present invention, TiCN can be compounded and generated in situ on the metal surface, so as to realize the strengthening of the metal surface and improve the wear resistance.

The present invention has the following advantages:

1. TiCN is compounded in situ on the metal surface, rather than deposited on the surface, so there is no problem of bonding between the coating and the substrate;

2. The thickness of the metal surface compounded with TiCN in situ can reach 500 microns, and the microhardness can reach more than HV2600. Therefore, even if the surface is slightly worn during use, it still has good hardness and wear resistance.

_The TiO of the present invention is industrial pure _TiO and isopropylamine, and the mixing mass ratio of the industrial pure _TiO to isopropylamine and carbon black is 9:5:3.

According to different metal materials, the following parameters can also be selected to achieve the best results:

The thickness of the coating of the mixture is 1.5-2 mm.

The flow rate of the methane is 9-10 L/min, and the flow rate of the nitrogen gas is 7-8 L/min.

The scanning speed of the laser beam is 400-600 mm/min, the power is 700-1200 W, the wavelength is 1.06 μm or 10.6 μm, and the spot diameter is 2-3 mm.

Detailed ways

1. Surface treatment of Q235A, 20 steel, 40 steel, 45 steel, 20G, 20Mn, 40Mn and 60Mn carbon structural steel:

1. Apply a mixture of industrially pure TiO ₂ and isopropylamine and carbon black on the surface of carbon structural steel, with a mass ratio of 9:5:3 and a thickness of 1.5 mm;

2. As the laser spot moves, a mixed gas of methane and nitrogen is passed through, and the flow rates of methane and nitrogen are 9L/min and 7L/min respectively;

3. The laser beam scans at a speed of 500mm/min, the laser power is 900W, the laser wavelength is 1.06μm, and the spot diameter is 2mm.

4. According to the test results, a TiCN layer with a thickness of up to 600 microns is formed in situ on the surface of carbon structural steel, and the microhardness can reach above HV2600.

2. Surface treatment of 20MnV, 40Cr, 35CrMoV and 20CrMnSi alloy structural steel respectively:

1. Coat the surface of the alloy structural steel with a mixture of industrially pure TiO ₂ , dimethylamine and carbon black, with a mass ratio of 9:5:3 and a thickness of 1.5 mm;

2. As the laser spot moves, a mixed gas of methane and nitrogen is passed through, and the flow rates of methane and nitrogen are 9L/min and 7L/min respectively;

3. The laser beam scans at a speed of 400mm/min, the laser power is 700W, the laser wavelength is 1.06μm, and the spot diameter is 2mm.

4. According to the test results, a TiCN layer with a thickness of up to 500 microns is formed in situ on the surface of the alloy structural steel, and the microhardness can reach above HV2650.

3. Surface treatment of 65Mn, 60Si2Mn and 50CrVA spring steel respectively:

1. Coat the surface of the spring steel with a mixture of commercially pure TiO ₂ and isopropylamine and carbon black, with a mass ratio of 9:5:3 and a thickness of 2 mm;

2. As the laser spot moves, a mixed gas of methane and nitrogen is passed through, and the flow rates of methane and nitrogen are 10L/min and 8L/min respectively;

3. The laser beam scans at a speed of 600mm/min, the laser power is 800W, the laser wavelength is 1.06μm, and the spot diameter is 3mm.

4. According to the test results, a TiCN layer with a thickness of up to 500 microns is formed in situ on the surface of the spring steel, and the microhardness can reach above HV2700.

4. Surface treatment of T8A, T9A, T10A, T11A, 9SiCr, Cr12MoV and 3Cr2Mo tool steels respectively:

1. Coat the surface of the tool steel with a mixture of industrially pure TiO ₂ and isopropylamine and carbon black, with a mass ratio of 9:5:3 and a thickness of 1.5 mm;

2. As the laser spot moves, a mixed gas of methane and nitrogen is passed through, and the flow rates of methane and nitrogen are 9L/min and 7L/min respectively;

3. The laser beam scans at a speed of 400mm/min, the laser power is 1000W, the laser wavelength is 10.6μm, and the spot diameter is 3mm.

4. According to the test results, a TiCN layer with a thickness of up to 600 microns is formed in situ on the surface of the tool steel, and the microhardness can reach above HV2700.

5. Surface treatment of W18Cr4V, W6Mo5Cr4V2 and W6Mo5Cr4V2Al high-speed steel:

1. Coat the surface of the high-speed steel with a mixture of industrially pure TiO ₂ and isopropylamine and carbon black, with a mass ratio of 9:5:3 and a thickness of 1.5 mm;

2. As the laser spot moves, a mixed gas of methane and nitrogen is passed through, and the flow rates of methane and nitrogen are 10L/min and 8L/min respectively;

3. The laser beam is scanned at a speed of 500mm/min, the laser power is 1100W, the laser wavelength is 10.6μm, and the spot diameter is 2mm.

4. According to the test results, a TiCN layer with a thickness of up to 500 microns is formed in situ on the surface of the high-speed steel, and the microhardness can reach above HV2700.

6. Surface treatment of YG3X, YG6X, YK15, YG20, YT15, YS25, YW1, YW2 and YL10 cemented carbide respectively:

1. Apply industrial pure TiO ₂ and isopropylamine, carbon black mixture on the surface of the cemented carbide, the mass ratio is 9:5:3, and the thickness is 2 mm;

2. As the laser spot moves, a mixed gas of methane and nitrogen is passed through, and the flow rates of methane and nitrogen are 10L/min and 8L/min respectively;

3. The laser beam is scanned at a speed of 600mm/min, the laser power is 1200W, the laser wavelength is 10.6μm, and the spot diameter is 3mm.

4. According to the test results, a TiCN layer with a thickness of up to 600 microns is formed in situ on the surface of the cemented carbide, and the microhardness can reach above HV2700.

Claims (2)

1. with TiO ₂, Isopropylamine, carbon black and methane, the nitrogen induced with laser metal surface composite Ti CN enhancement method that is constituent element, it is characterized in that at metallic surface coating TiO ₂with the mixture of Isopropylamine, carbon black, under the condition coexisting at methane and nitrogen, with laser beam, in the metallic surface of the described mixture of coating, scan; Described TiO ₂for technical pure TiO ₂and Isopropylamine, described technical pure TiO ₂compare for 9:5:3 with the mixing quality of Isopropylamine, carbon black; The thickness of the described mixture of described coating is 1.5～2 millimeters; The sweep velocity of described laser beam is 400～600mm/min, and power is 700～1200W, and wavelength is 1.06 μ m or 10.6 μ m, and spot diameter is 2～3 millimeters.

2. according to claim 1 with TiO ₂, Isopropylamine, carbon black and methane, the nitrogen induced with laser metal surface composite Ti CN enhancement method that is constituent element, the flow that it is characterized in that described methane is 9～10L/min, the flow of described nitrogen is 7～8L/min.