A wear-resistant coating on the surface of drill steel and the drill tool

Abstract

This invention relates to the field of wear-resistant materials, specifically to a wear-resistant coating on the surface of drill steel and a drill tool, including a Ni-Co-X coating and a Ni-Co-W-Y-hard phase coating, where X is B, P or Si, and Y is a rare earth element. The wear-resistant coating prepared by this invention has high hardness and good wear resistance.

Description

Technical Field

[0001] This invention relates to the field of wear-resistant materials, specifically to a wear-resistant coating on the surface of drill steel and a drill tool. Background Technology

[0002] Drill steel is a type of micro-alloyed controlled-rolled steel with high strength and good toughness. However, its surface hardness is relatively low, making it prone to wear and affecting its reliability and service life. Improving the wear resistance of drill steel through surface treatment is crucial for extending its service life.

[0003] Chemical plating is an excellent surface modification technique. Its main principle is to reduce metal ions to elemental metal in a metal ion solution using a strong reducing agent, and then deposit this metal onto the surface of the substrate material to form a dense coating. Diamond is the hardest material, therefore, chemical plating is a good way to improve the wear resistance of chemically plated coatings. However, during the plating process, the dispersion of nanodiamonds in the solution is difficult to solve, making it hard to obtain a uniform coating, which inevitably leads to a decrease in the hardness and wear resistance of the coating. Summary of the Invention

[0004] Purpose of the invention: In view of the above-mentioned technical problems, the present invention proposes a wear-resistant coating on the surface of drill steel and a drill tool.

[0005] The technical solution adopted is as follows:

[0006] A wear-resistant coating for the surface of drill steel includes a Ni-Co-X coating and a Ni-Co-WY-hard phase coating, where X is B, P or Si and Y is a rare earth element.

[0007] Furthermore, X is B.

[0008] Furthermore, Y is Re.

[0009] Furthermore, the hard phase is nanodiamond.

[0010] The present invention also provides a drilling tool, comprising the above-mentioned wear-resistant coating and a drilling tool steel substrate.

[0011] The present invention also provides a method for preparing the above-mentioned drill bit:

[0012] After cleaning the surface of the drill bit steel substrate, it is placed in Ni-Co-B electroplating solution to pre-plat a Ni-Co-B coating on its surface. After completion, it is taken out and placed in Ni-Co-W-Re hard phase electroplating solution for a second plating. Finally, it is heat-treated at 350-450℃ under inert gas protection.

[0013] Furthermore, the Ni-Co-B electroplating solution comprises the following components:

[0014] Ni salt 20-23 g / L, Co salt 3-5 g / L, sodium saccharin 2-4 g / L, dimethyl borane 5-10 g / L, boric acid 20-25 g / L, sodium citrate 30-35 g / L.

[0015] Furthermore, the Ni-Co-W-Re hard phase electroplating solution comprises the following components:

[0016] Ni salt 20-23 g / L, Co salt 3-5 g / L, Na2WO4 3-5 g / L, NH4ReO4 3-5 g / L, sodium saccharin 2-4 g / L, nano diamond 5-10 g / L, sodium citrate 30-35 g / L, sodium dodecyl sulfate 0.1-0.5 g / L, dodecyl hydroxypropyl sulfobetaine 0.1-0.5 g / L, boric acid 20-25 g / L.

[0017] Furthermore, the nanodiamonds undergo surface sulfonation treatment.

[0018] Furthermore, the preparation method of the nanodiamond is as follows:

[0019] Nanodiamond powder and sodium nitrate are added to concentrated sulfuric acid and mixed evenly. Then potassium permanganate is added and stirring is continued. The first portion of water is added, and the mixture is heated to 75-85℃ and reacted for 30-50 minutes. The temperature is then lowered to 35-45℃, and the second portion of water and hydrogen peroxide solution are added. The mixture is stirred and reacted for 3-5 hours. After cooling to room temperature, it is filtered. The resulting solid is washed with water and vacuum dried to constant weight to obtain diamond oxide. Under inert gas protection, diamond oxide, DMSO, 1,4-butyrosulactone, and NaOH are mixed evenly. The mixture is heated to 110-120℃ and reacted for 6-10 hours. After cooling to room temperature, water is added and stirred for 30-50 minutes. The mixture is then filtered. The resulting solid is washed with ethanol and water and vacuum dried to constant weight.

[0020] The beneficial effects of this invention are:

[0021] This invention provides a wear-resistant coating for drill steel surfaces. The Ni-Co-X coating, acting as an intermediate layer, improves the bonding performance between the Ni-Co-WY hard phase coating and the drill steel substrate. The resulting gradient-like coating also reduces internal stress between the Ni-Co-WY hard phase coating and the drill steel substrate, minimizing damage to the coating and preventing crack formation. Surface sulfonation treatment increases the surface potential of the nanodiamond particles, enhancing electrostatic repulsion and improving the suspension stability of the nanodiamond particles in the electroplating solution, thus increasing the uniformity of the coating. The hydrocarbon chains of sodium dodecyl sulfate and dodecyl hydroxypropyl sulfobetaine can synergistically and complementaryly reduce the surface tension of the electroplating solution, making micelles easier to form and improving the dispersion effect on nanodiamond particles. During heat treatment, elements in the Ni-Co-X coating and Ni-Co-WY-hard phase coating will diffuse, resulting in better bonding between coatings and between the coating and the substrate. The internal stress of the coating is also effectively released, and coherent distortion occurs, further enhancing the hardness and wear resistance of the coating. The wear-resistant coating prepared by this invention has high hardness and good wear resistance. Attached Figure Description

[0022] Figure 1 This is a SEM image of the coating prepared in Example 1 of the present invention. Detailed Implementation

[0023] Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer should be followed. Reagents or instruments whose manufacturers are not specified are all commercially available products. Techniques not mentioned in this invention refer to existing technologies.

[0024] Example 1:

[0025] A drilling tool includes an N80 drilling tool steel substrate and a Ni-Co-B coating and a Ni-Co-W-Re nanodiamond coating on the surface.

[0026] The above-mentioned drilling tool preparation method:

[0027] Using 100 in sequence # 500 # 1200 # 1500 # Metallographic sandpaper was used to polish the N80 drill bit steel substrate. After washing, degreasing, rust removal, and rinsing again, the surface was dried with hot nitrogen. It was then placed in a Ni-Co-B electroplating solution as the cathode, with a nickel plate as the anode. A Ni-Co-B coating was pre-plated onto the surface at 50℃, mechanical stirring (200 rpm) during plating, for 60 minutes, with a current density of 5 A / dm³. 2After cleaning and drying, the sample is placed in a Ni-Co-W-Re nanodiamond electroplating solution as the cathode, with a nickel plate as the anode, for a second plating process. The second plating temperature is 85℃, and mechanical stirring (350 r / min) is used during the plating process. The plating time is 120 min, and the current density is 5 A / dm³. 2 Remove, clean, and dry the sample. Place it in a muffle furnace under argon protection and heat it to 400°C at a rate of 5°C / min. Hold it at this temperature for 1 hour and then allow it to cool naturally to room temperature.

[0028] The Ni-Co-B electroplating solution comprises the following components:

[0029] NiSO4 21g / L, CoSO4 3g / L, sodium saccharin 3g / L, dimethyl borane 8g / L, boric acid 24g / L, sodium citrate 35g / L;

[0030] The Ni-Co-W-Re nanodiamond electroplating solution comprises the following components:

[0031] NiSO4 21g / L, CoSO4 3g / L, Na2WO4 5g / L, NH4ReO4 4g / L, sodium saccharin 3g / L, nano diamond 8g / L, sodium citrate 30g / L, sodium dodecyl sulfate 0.1g / L, dodecyl hydroxypropyl sulfonate betaine 0.1g / L, boric acid 20g / L;

[0032] The aforementioned nanodiamonds underwent surface sulfonation treatment, the specific method of which is as follows:

[0033] Add 5g of nanodiamond powder and 5g of sodium nitrate to 100mL of concentrated sulfuric acid, mix well, then add 20g of potassium permanganate, continue stirring for 1h, add 300mL of water, heat to 80℃ and react for 50min, then cool to 45℃, add 700mL of water and 100mL of 30% hydrogen peroxide solution, stir and react for 5h, then cool to room temperature, filter, wash the obtained solid with water and vacuum dry to constant weight to obtain diamond oxide. Under argon protection, mix 4g of diamond oxide, 80mL of DMSO, 4mL of 1,4-butyrosulactone and 4g of NaOH, heat to 120℃ and react for 8h, then cool to room temperature, add 200mL of water and stir for 40min, then filter, wash the obtained solid with ethanol and water successively, and vacuum dry to constant weight.

[0034] Example 2:

[0035] A drilling tool includes an N80 drilling tool steel substrate and a Ni-Co-B coating and a Ni-Co-W-Re nanodiamond coating on the surface.

[0036] The above-mentioned drilling tool preparation method:

[0037] Using 100 in sequence # 500 # 1200 # 1500 # Metallographic sandpaper was used to polish the N80 drill bit steel substrate. After washing, degreasing, rust removal, and rinsing again, the surface was dried with hot nitrogen. It was then placed in a Ni-Co-B electroplating solution as the cathode, with a nickel plate as the anode. A Ni-Co-B coating was pre-plated onto the surface at 50℃, mechanical stirring (200 rpm) during plating, for 60 minutes, with a current density of 5 A / dm³. 2 After cleaning and drying, the sample is placed in a Ni-Co-W-Re nanodiamond electroplating solution as the cathode, with a nickel plate as the anode, for a second plating process. The second plating temperature is 85℃, and mechanical stirring (350 r / min) is used during the plating process. The plating time is 120 min, and the current density is 5 A / dm³. 2 Remove, clean, and dry the sample. Place it in a muffle furnace under argon protection and heat it to 450°C at a rate of 5°C / min. Hold it at this temperature for 2 hours and then allow it to cool naturally to room temperature.

[0038] The Ni-Co-B electroplating solution comprises the following components:

[0039] NiSO4 23g / L, CoSO4 5g / L, sodium saccharin 4g / L, dimethyl borane 10g / L, boric acid 20-25g / L, sodium citrate 35g / L;

[0040] The Ni-Co-W-Re nanodiamond electroplating solution comprises the following components:

[0041] NiSO4 23g / L, CoSO4 5g / L, Na2WO4 5g / L, NH4ReO4 5g / L, sodium saccharin 4g / L, nano diamond 10g / L, sodium citrate 35g / L, sodium dodecyl sulfate 0.5g / L, dodecyl hydroxypropyl sulfobetaine 0.5g / L, boric acid 25g / L;

[0042] The above-mentioned nanodiamonds underwent surface sulfonation treatment, and the specific method is the same as in Example 1.

[0043] Example 3:

[0044] A drilling tool includes an N80 drilling tool steel substrate and a Ni-Co-B coating and a Ni-Co-W-Re nanodiamond coating on the surface.

[0045] The above-mentioned drilling tool preparation method:

[0046] Using 100 in sequence # 500 #1200 # 1500 # Metallographic sandpaper was used to polish the N80 drill bit steel substrate. After washing, degreasing, rust removal, and rinsing again, the surface was dried with hot nitrogen. It was then placed in a Ni-Co-B electroplating solution as the cathode, with a nickel plate as the anode. A Ni-Co-B coating was pre-plated onto the surface at 50℃, mechanical stirring (200 rpm) during plating, for 60 minutes, with a current density of 5 A / dm³. 2 After cleaning and drying, the sample is placed in a Ni-Co-W-Re nanodiamond electroplating solution as the cathode, with a nickel plate as the anode, for a second plating process. The second plating temperature is 85℃, and mechanical stirring (350 r / min) is used during the plating process. The plating time is 120 min, and the current density is 5 A / dm³. 2 Remove, clean, and dry the sample. Place it in a muffle furnace under argon protection and heat it to 350°C at a rate of 5°C / min. After heat treatment for 1 hour, allow it to cool naturally to room temperature.

[0047] The Ni-Co-B electroplating solution comprises the following components:

[0048] NiSO4 20g / L, CoSO4 3g / L, sodium saccharin 2g / L, dimethyl borane 5g / L, boric acid 20-25g / L, sodium citrate 30g / L;

[0049] The Ni-Co-W-Re nanodiamond electroplating solution comprises the following components:

[0050] NiSO4 20g / L, CoSO4 3g / L, Na2WO4 3g / L, NH4ReO4 3g / L, sodium saccharin 2g / L, nano diamond 5g / L, sodium citrate 30g / L, sodium dodecyl sulfate 0.1g / L, dodecyl hydroxypropyl sulfobetaine 0.1g / L, boric acid 20g / L;

[0051] The above-mentioned nanodiamonds underwent surface sulfonation treatment, and the specific method is the same as in Example 1.

[0052] Example 4:

[0053] A drilling tool includes an N80 drilling tool steel substrate and a Ni-Co-B coating and a Ni-Co-W-Re nanodiamond coating on the surface.

[0054] The above-mentioned drilling tool preparation method:

[0055] Using 100 in sequence # 500 # 1200 # 1500 #Metallographic sandpaper was used to polish the N80 drill bit steel substrate. After washing, degreasing, rust removal, and rinsing again, the surface was dried with hot nitrogen. It was then placed in a Ni-Co-B electroplating solution as the cathode, with a nickel plate as the anode. A Ni-Co-B coating was pre-plated onto the surface at 50℃, mechanical stirring (200 rpm) during plating, for 60 minutes, with a current density of 5 A / dm³. 2 After cleaning and drying, the sample is placed in a Ni-Co-W-Re nanodiamond electroplating solution as the cathode, with a nickel plate as the anode, for a second plating process. The second plating temperature is 85℃, and mechanical stirring (350 r / min) is used during the plating process. The plating time is 120 min, and the current density is 5 A / dm³. 2 Remove, clean, and dry the sample. Place it in a muffle furnace under argon protection and heat it to 450°C at a rate of 5°C / min. Hold it at this temperature for 1 hour and then allow it to cool naturally to room temperature.

[0056] The Ni-Co-B electroplating solution comprises the following components:

[0057] NiSO4 23g / L, CoSO4 3g / L, sodium saccharin 4g / L, dimethyl borane 5g / L, boric acid 20-25g / L, sodium citrate 35g / L;

[0058] The Ni-Co-W-Re nanodiamond electroplating solution comprises the following components:

[0059] NiSO4 20g / L, CoSO4 5g / L, Na2WO4 3g / L, NH4ReO4 5g / L, sodium saccharin 2g / L, nano diamond 10g / L, sodium citrate 30g / L, sodium dodecyl sulfate 0.5g / L, dodecyl hydroxypropyl sulfobetaine 0.1g / L, boric acid 25g / L;

[0060] The above-mentioned nanodiamonds underwent surface sulfonation treatment, and the specific method is the same as in Example 1.

[0061] Example 5:

[0062] A drilling tool includes an N80 drilling tool steel substrate and a Ni-Co-B coating and a Ni-Co-W-Re nanodiamond coating on the surface.

[0063] The above-mentioned drilling tool preparation method:

[0064] Using 100 in sequence # 500 # 1200 # 1500 #Metallographic sandpaper was used to polish the N80 drill bit steel substrate. After washing, degreasing, rust removal, and rinsing again, the surface was dried with hot nitrogen. It was then placed in a Ni-Co-B electroplating solution as the cathode, with a nickel plate as the anode. A Ni-Co-B coating was pre-plated onto the surface at 50℃, mechanical stirring (200 rpm) during plating, for 60 minutes, with a current density of 5 A / dm³. 2 After cleaning and drying, the sample is placed in a Ni-Co-W-Re nanodiamond electroplating solution as the cathode, with a nickel plate as the anode, for a second plating process. The second plating temperature is 85℃, and mechanical stirring (350 r / min) is used during the plating process. The plating time is 120 min, and the current density is 5 A / dm³. 2 Remove, clean, and dry the sample. Place it in a muffle furnace under argon protection and heat it to 350°C at a rate of 5°C / min. Hold it at this temperature for 2 hours and then allow it to cool naturally to room temperature.

[0065] The Ni-Co-B electroplating solution comprises the following components:

[0066] NiSO4 20g / L, CoSO4 5g / L, sodium saccharin 2g / L, dimethyl borane 10g / L, boric acid 20-25g / L, sodium citrate 30g / L;

[0067] The Ni-Co-W-Re nanodiamond electroplating solution comprises the following components:

[0068] NiSO4 23g / L, CoSO4 3g / L, Na2WO4 5g / L, NH4ReO4 3g / L, sodium saccharin 4g / L, nano diamond 5g / L, sodium citrate 35g / L, sodium dodecyl sulfate 0.1g / L, dodecyl hydroxypropyl sulfobetaine 0.5g / L, boric acid 20g / L;

[0069] The above-mentioned nanodiamonds underwent surface sulfonation treatment, and the specific method is the same as in Example 1.

[0070] Comparative Example 1:

[0071] It is basically the same as Example 1, except that it does not undergo heat treatment.

[0072] Comparative Example 2:

[0073] It is basically the same as Example 1, except that the nanodiamonds are not subjected to surface sulfonation treatment.

[0074] Comparative Example 3:

[0075] It is basically the same as Example 1, except that sodium dodecyl sulfate is used instead of dodecyl hydroxypropyl sulfobetaine.

[0076] Comparative Example 4:

[0077] It is basically the same as Example 1, except that sodium dodecyl sulfate is used instead of dodecyl hydroxypropyl sulfobetaine.

[0078] Performance testing:

[0079] The drill bits prepared in Examples 1-5 and Comparative Examples 1-4 of the present invention were used as samples for performance testing. The microhardness of the coating was tested using a Vickers hardness tester. Five points were randomly selected for testing, and the average value of the microhardness value was taken and converted.

[0080] The HSR-2M friction testing machine was used to test the friction of the samples. The mass loss of the samples was measured by an auxiliary electronic balance. No lubrication was used during the friction test. The test conditions were: room temperature, bearing steel balls (grade: SUJ2) as the grinding material, load of 10N, and friction time of 60min. The wear resistance of the samples was evaluated based on the coefficient of friction and mass loss.

[0081] The test results are shown in Table 1 below:

[0082] Table 1:

[0083] <![CDATA[Hardness / HV 0.3 > coefficient of friction mass loss / mg Example 1 1043 0.135 0.583 Example 2 1028 0.160 0.840 Example 3 1014 0.154 0.744 Example 4 992 0.182 1.120 Example 5 975 0.188 1.118 Comparative Example 1 883 0.142 0.612 Comparative Example 2 767 0.201 1.955 Comparative Example 3 984 0.162 0.798 Comparative Example 4 967 0.147 0.634

[0084] As shown in Table 1 above, the wear-resistant coating prepared by the present invention has high hardness and good wear resistance.

[0085] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drill, characterized in that The drill steel substrate is placed in a Ni-Co-B plating solution after surface cleaning, and a Ni-Co-B plating layer is pre-plated on the surface of the drill steel substrate. The wear-resistant plating layer comprises a Ni-Co-X plating layer and a Ni-Co-W-Y-hard phase plating layer, wherein X is B. Y is Re. The hard phase is nanodiamond. The preparation method of the drill tool is as follows: After surface cleaning, the drill steel substrate is placed in a Ni-Co-B plating solution, and a Ni-Co-B plating layer is pre-plated on the surface of the drill steel substrate. After completion, it is taken out and placed in a Ni-Co-W-Re-hard phase plating solution for the second plating. Finally, it is subjected to heat treatment under the protection of inert gas at 350-450℃. The Ni-Co-W-Re-hard phase plating solution comprises the following components: Ni salt 20-23 g / L, Co salt 3-5 g / L, Na2WO4 3-5 g / L, NH4ReO4 3-5 g / L, sodium saccharin 2-4 g / L, nanodiamond 5-10 g / L, sodium citrate 30-35 g / L, sodium dodecyl sulfate 0.1-0.5 g / L, dodecyl hydroxypropyl sulfobetaine 0.1-0.5 g / L, boric acid 20-25 g / L. The nanodiamond is subjected to surface sulfonation treatment.

2. The drill string of claim 1, wherein, The Ni-Co-B plating solution comprises the following components: Ni salt 20-23 g / L, Co salt 3-5 g / L, sodium saccharin 2-4 g / L, borane dimethylamine 5-10 g / L, boric acid 20-25 g / L, sodium citrate 30-35 g / L.

3. The drill string of claim 1, wherein, The preparation method of the nanodiamond is as follows: The nanodiamond powder and sodium nitrate are added to concentrated sulfuric acid, mixed uniformly, then potassium permanganate is added, and stirring is continued. The first portion of water is added, the temperature is raised to 75-85℃, and the reaction is carried out for 30-50 min. Then the temperature is lowered to 35-45℃, the second portion of water and hydrogen peroxide solution are added, and the reaction is carried out for 3-5 h under stirring. After cooling to room temperature, filtration is carried out, and the obtained solid is washed with water and vacuum dried to constant weight to obtain oxidized nanodiamond. Under the protection of inert gas, the oxidized nanodiamond, DMSO, 1,4-butanesulfonic acid lactone and NaOH are mixed uniformly, the temperature is raised to 110-120℃, and the reaction is carried out for 6-10 h. After cooling to room temperature, water is added and stirred for 30-50 min, then filtration is carried out. The obtained solid is washed with ethanol and water, and vacuum dried to constant weight.

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