A surfacing electrode for gear wear repair and a method for preparing the same

Abstract

The present application relates to the technical field of surfacing electrode, and proposes a surfacing electrode for gear wear repair and a preparation method thereof.The surfacing electrode for gear wear repair comprises a welding core and a welding sheath covering the welding core, and the welding sheath comprises: 35-40 parts of marble, 10-20 parts of fluorite, 30-40 parts of high-carbon chromium iron, 5-8 parts of magnesium nitride, 15-30 parts of titanium nitride, 1-3 parts of vanadium and 2-5 parts of zinc oxide; the welding core is composed of the following components: C 0.05%-0.10%, Mn 0.2%-0.5%, Ni 0.5%-0.8%, Cr 0.3%-0.6%, Mo 0.2%-0.4%, Zr 0.1%-0.3%, S 0.001%-0.005%, P 0.001%-0.005%, and the rest is iron and inevitable impurities.The present application solves the problem of poor hardness and impact resistance of the repaired gear in the related art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of surfacing electrode, in particular, relates to a surfacing electrode for gear wear repair and a preparation method thereof. BACKGROUND

[0002] Surfacing is a process of depositing filler metal on the surface of the base material, which can provide the required size and performance to meet the product use requirements, such as corrosion resistance, impact resistance, heat resistance, etc. The electrode used for surfacing to obtain a wear-resistant or corrosion-resistant metal surface is called a surfacing electrode. The surfacing electrode is often used for repairing and recycling, for example, it can be used for gear wear repair to enhance the service life of the gear and reduce the overall cost. According to different use conditions and hardness requirements, the surfacing electrode can be divided into pearlite surfacing electrode, martensite surfacing electrode, manganese austenite surfacing electrode, etc. With the increasing use requirements, the hardness and impact resistance of the repaired gear by the existing surfacing electrode need to be further improved. SUMMARY

[0003] The present application provides a surfacing electrode for gear wear repair and a preparation method thereof, which solves the problem of poor hardness and impact resistance of the repaired gear by the surfacing electrode in the related art.

[0004] The technical scheme of the present application is as follows:

[0005] The present application provides a surfacing electrode for gear wear repair, which comprises a welding core and a welding sheath covering the welding core,

[0006] The welding sheath comprises the following components by weight: 35-40 parts of marble, 10-20 parts of fluorite, 30-40 parts of high-carbon chromium iron, 5-8 parts of magnesium nitride, 15-30 parts of titanium nitride, 1-3 parts of vanadium, and 2-5 parts of zinc oxide.

[0007] The welding core is composed of the following components by weight percentage: C 0.05%-0.10%, Mn 0.2%-0.5%, Ni 0.5%-0.8%, Cr 0.3%-0.6%, Mo 0.2%-0.4%, Zr 0.1%-0.3%, S 0.001%-0.005%, P 0.001%-0.005%, and the rest is iron and unavoidable impurities.

[0008] As a further technical scheme, the welding sheath further comprises cerium oxide and bismuth oxide in a mass ratio of 1:4-4:1.

[0009] The present application further improves the hardness and impact resistance of the surfacing layer by limiting the welding sheath to further comprise cerium oxide and bismuth oxide in a mass ratio of 1:4-4:1.

[0010] As a further technical solution, the mass ratio of the cerium oxide and the bismuth oxide to the mass of the zinc oxide is 0.5-3.5:5.

[0011] The application further improves the hardness and impact resistance of the surfacing layer by limiting the mass ratio of the cerium oxide and the bismuth oxide to the mass of the zinc oxide to 0.5-3.5:5.

[0012] As a further technical solution, the mass ratio of the cerium oxide and the bismuth oxide is 2:3-3:2.

[0013] The application further improves the hardness and impact resistance of the surfacing layer by limiting the mass ratio of the cerium oxide and the bismuth oxide to 2:3-3:2.

[0014] As a further technical solution, the mass ratio of the cerium oxide, the bismuth oxide and the zinc oxide to the mass of the vanadium is 8.5:1.5-2.5.

[0015] The application further improves the hardness and impact resistance of the surfacing layer by limiting the mass ratio of the cerium oxide, the bismuth oxide and the zinc oxide to the mass of the vanadium to 8.5:1.5-2.5.

[0016] As a further technical solution, the high-carbon chromium iron comprises chromium with a mass content of 62%-72%, carbon with a mass content of ≤6%, and silicon with a mass content of ≤3%.

[0017] As a further technical solution, the diameter of the welding core is 1.5-2mm, and the thickness of the welding skin is 0.5-1mm.

[0018] The application further provides a preparation method of the surfacing electrode for gear wear repair, comprising the following steps:

[0019] The components in the welding skin are uniformly mixed, and the adhesive is used for pressure coating on the outside of the welding core to obtain the surfacing electrode for gear wear repair.

[0020] As a further technical solution, the adhesive comprises water glass.

[0021] The application further provides the application of the surfacing electrode for gear wear repair or the surfacing electrode prepared by the preparation method of the surfacing electrode for gear wear repair in gear wear repair.

[0022] The working principle and beneficial effects of the application are as follows:

[0023] In the present application, the CaO-CaF2 system is selected as the slag system, the deoxidation and desulfurization capacity of the molten slag is improved, vanadium and zinc oxide are added in the coating of the surfacing electrode, during the use of the surfacing electrode, on the one hand, the surface tension of the molten iron is reduced, the inclusions in the molten slag are more easily floated out, and the impurity content in the surfacing layer is effectively reduced; on the other hand, the possibility of producing white mouth and hot crack is reduced, so that the defects of the surfacing layer are reduced, and at the same time, through the adjustment and optimization of the content of each component, the hardness and impact resistance of the repaired gear of the surfacing electrode are improved. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] In the following examples and comparative examples, the parameters of the raw materials are as follows:

[0026] The marble is DM-120, purchased from Qingyuan De Maohua Chemical Co., Ltd.;

[0027] The fluorite is rm-01, in which the mass content of calcium fluoride is greater than or equal to 97%, the mass content of silicon dioxide is less than or equal to 1.2%, the mass content of calcium carbonate is less than or equal to 0.8%, the mass content of sulfur is less than or equal to 0.03%, and the mass content of carbon is less than or equal to 0.02%, purchased from Shijiazhuang Ruiming Mineral Products Co., Ltd.;

[0028] The high-carbon chromium iron is FeCr67C6.0, in which the mass content of chromium is 62% to 72%, the mass content of carbon is less than or equal to 6%, the mass content of silicon is less than or equal to 3%, and the mass content of phosphorus is less than or equal to 0.03%, purchased from Qinghe Yaohe Metal Material Co., Ltd.;

[0029] The binder is water glass.

[0030] Example 1

[0031] A surfacing electrode for repairing gear wear, comprising a welding core and a coating wrapped outside the welding core, the welding core is composed of the following components in percentage by weight: C 0.05%, Mn 0.2%, Ni 0.5%, Cr 0.3%, Mo 0.2%, Zr 0.1%, S 0.001%, P 0.001%, and the rest is iron and inevitable impurities.

[0032] The preparation method comprises the following steps:

[0033] Marble 35 parts, fluorite 10 parts, high-carbon chromium iron 30 parts, magnesium nitride 5 parts, titanium nitride 15 parts, vanadium 1 part, zinc oxide 5 parts are mixed uniformly, and are coated on a welding core with a diameter of 2 mm by using a binder, and are dried to obtain a gear wear repair surfacing electrode with a welding skin thickness of 1 mm.

[0034] Example 2

[0035] A gear wear repair surfacing electrode comprises a welding core and a welding skin coated outside the welding core, and the welding core is composed of the following components in percentage by weight: C 0.10%, Mn 0.5%, Ni 0.8%, Cr 0.6%, Mo 0.4%, Zr 0.3%, S 0.005%, P 0.005%, and the rest is iron and inevitable impurities.

[0036] A preparation method thereof comprises the following steps:

[0037] Marble 40 parts, fluorite 20 parts, high-carbon chromium iron 40 parts, magnesium nitride 8 parts, titanium nitride 30 parts, vanadium 3 parts, and zinc oxide 2 parts are mixed uniformly, and are coated on a welding core with a diameter of 2 mm by using a binder, and are dried to obtain a gear wear repair surfacing electrode with a welding skin thickness of 1 mm.

[0038] Example 3

[0039] A gear wear repair surfacing electrode comprises a welding core and a welding skin coated outside the welding core, and the welding core is composed of the following components in percentage by weight: C 0.05%, Mn 0.2%, Ni 0.5%, Cr 0.3%, Mo 0.2%, Zr 0.1%, S 0.001%, P 0.001%, and the rest is iron and inevitable impurities.

[0040] A preparation method thereof comprises the following steps:

[0041] Marble 35 parts, fluorite 10 parts, high-carbon chromium iron 30 parts, magnesium nitride 5 parts, titanium nitride 15 parts, vanadium 1 part, zinc oxide 5 parts, cerium oxide 0.05 parts, and bismuth oxide 0.2 parts are mixed uniformly, and are coated on a welding core with a diameter of 2 mm by using a binder, and are dried to obtain a gear wear repair surfacing electrode with a welding skin thickness of 1 mm.

[0042] Example 4

[0043] The difference from example 3 is that cerium oxide is 0.8 parts and bismuth oxide is 3.2 parts.

[0044] Example 5

[0045] The difference from example 3 is that cerium oxide is 0.1 parts and bismuth oxide is 0.4 parts.

[0046] Example 6

[0047] The difference from Example 3 is that cerium oxide is 0.7 parts and bismuth oxide is 2.8 parts.

[0048] Example 7

[0049] The difference from Example 3 is that cerium oxide is 2.8 parts and bismuth oxide is 0.7 parts.

[0050] Example 8

[0051] The difference from Example 3 is that cerium oxide is 1.4 parts and bismuth oxide is 2.1 parts.

[0052] Example 9

[0053] The difference from Example 3 is that cerium oxide is 2.1 parts and bismuth oxide is 1.4 parts.

[0054] Example 10

[0055] The difference from Example 8 is that vanadium is 3 parts.

[0056] Example 11

[0057] The difference from Example 8 is that vanadium is 1.5 parts.

[0058] Example 12

[0059] The difference from Example 8 is that vanadium is 2.5 parts.

[0060] Comparative Example 1

[0061] The difference from Example 1 is that zinc oxide is replaced by an equal amount of zinc borate.

[0062] Comparative Example 2

[0063] A gear wear repair surfacing electrode comprises a core and a sheath coated outside the core, the core is composed of the following components in percentage by weight: C 0.05%, Mn 0.2%, Ni 0.5%, Cr 0.3%, Mo 0.2%, Ti 0.1%, S 0.001%, P 0.001%, the rest is iron and inevitable impurities;

[0064] A preparation method thereof, comprising the following steps:

[0065] Marble 35 parts, fluorite 10 parts, high-carbon chromium iron 30 parts, magnesium nitride 5 parts, titanium nitride 15 parts, vanadium 1 part, zinc oxide 5 parts are uniformly mixed, and are coated on a core with a diameter of 2 mm with a binder, and are dried to obtain a gear wear repair surfacing electrode with a sheath thickness of 1 mm.

[0066] Test Example

[0067] The welding part of the worn gear to be repaired was heated to 150℃ and kept for 30 min; the gear to be repaired was welded using the gear wear repair surfacing electrode prepared in Examples 1-12 and Comparative Examples 1-2 at a current of 80 A and a voltage of 18 V, and the thickness of the surfacing layer was 4 mm; the welded gear was kept at 300℃ for 30 min and wrapped with asbestos for cooling, to obtain the repaired gear by the surfacing electrode.

[0068] The worn gear to be repaired was 38CrSiMnMo medium carbon quenched and tempered steel, which was specifically composed of the following components in mass percentage: C: 0.38%, Si: 1.22%, Mn: 0.98%, Cr: 1.33%, Mo: 0.24%, S: 0.011%, P: 0.009%, and the balance of Fe and unavoidable impurities.

[0069] The repaired gear by the surfacing electrode was ground into a sample of 10 mm x 10 mm x 55 mm, the hardness of the sample was tested according to the test method of GB / T 230.1-2018, using HRC scale and diamond cone indenter on 4 equidistant different axial sections; the impact resistance of the sample was tested according to the test method of GB / T 229-2020, using V-shaped notch, notch depth of 2 mm and test temperature of 0℃, and the results are shown in Table 1.

[0070] Table 1 Hardness and impact resistance test results of Examples 1-12 and Comparative Examples 1-2

[0071]

[0072] Compared with Comparative Examples 1-2, the surfacing electrode for gear wear repair prepared in Example 1 added zinc oxide in the coating, and the hardness and impact energy of Example 1 were higher than those of Comparative Examples 1-2, indicating that adding zinc oxide in the coating of the surfacing electrode for gear wear repair could improve the hardness and impact resistance of the repaired gear by the surfacing electrode.

[0073] Compared with Example 1, the surfacing electrode for gear wear repair prepared in Examples 3-4 further added cerium oxide and bismuth oxide in a mass ratio of 1:4-4:1 in the coating, and the hardness and impact energy of Examples 3-4 were higher than those of Example 1, indicating that adding cerium oxide and bismuth oxide in a mass ratio of 1:4-4:1 in the coating of the surfacing electrode for gear wear repair further improved the hardness and impact resistance of the repaired gear by the surfacing electrode.

[0074] Compared with examples 3~4, the mass ratio of cerium oxide and bismuth oxide in the welding sheath of the surfacing electrode for repairing gear wear prepared in examples 5~6 is 0.5~3.5:5, and the mass ratio of cerium oxide and bismuth oxide to zinc oxide is 0.5~3.5:5, and the hardness and impact energy of examples 5~6 are higher than those of examples 3~4, which indicates that the mass ratio of cerium oxide and bismuth oxide in the welding sheath is 0.5~3.5:5, and the hardness and impact resistance of the repaired gear are further improved.

[0075] Compared with examples 6~7, the mass ratio of cerium oxide and bismuth oxide in the welding sheath of the surfacing electrode for repairing gear wear prepared in examples 8~9 is 2:3~3:2, and the hardness and impact energy of examples 8~9 are higher than those of examples 6~7, which indicates that the mass ratio of cerium oxide and bismuth oxide is 2:3~3:2, and the hardness and impact resistance of the repaired gear are further improved.

[0076] Compared with examples 8 and example 10, the mass ratio of cerium oxide, bismuth oxide and zinc oxide to vanadium in the welding sheath of the surfacing electrode for repairing gear wear prepared in examples 11~12 is 8.5:1.5~2.5, and the hardness and impact energy of examples 11~12 are higher than those of examples 8 and example 10, which indicates that the mass ratio of cerium oxide, bismuth oxide and zinc oxide to vanadium is 8.5:1.5~2.5, and the hardness and impact resistance of the repaired gear are further improved.

[0077] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A surfacing electrode for gear wear repair, characterized by, The welding core and the welding skin covering the welding core, The welding skin comprises the following components by weight: 35-40 parts of marble, 10-20 parts of fluorite, 30-40 parts of high-carbon chromium iron, 5-8 parts of magnesium nitride, 15-30 parts of titanium nitride, 1-3 parts of vanadium, and 2-5 parts of zinc oxide. The welding core is composed of the following components by weight percentage: C 0.05%-0.10%, Mn 0.2%-0.5%, Ni 0.5%-0.8%, Cr 0.3%-0.6%, Mo 0.2%-0.4%, Zr 0.1%-0.3%, S 0.001%-0.005%, P 0.001%-0.005%, and the rest is iron and inevitable impurities.

2. A surfacing electrode for gear wear repair according to claim 1, characterized in that The welding skin further comprises cerium oxide and bismuth oxide in a mass ratio of 1:4-4:

1.

3. A surfacing electrode for gear wear repair according to claim 2, characterized in that The mass ratio of the cerium oxide and the bismuth oxide to the zinc oxide is 0.5-3.5:

5.

4. A surfacing electrode for gear wear repair according to claim 3, characterized in that The mass ratio of the cerium oxide and the bismuth oxide is 2:3-3:

2.

5. A surfacing electrode for gear wear repair according to claim 4, characterized in that The mass ratio of the cerium oxide, the bismuth oxide, and the zinc oxide to the vanadium is 8.5:1.5-2.

5.

6. A surfacing electrode for gear wear repair according to claim 1, characterized in that The high-carbon chromium iron comprises chromium with a mass content of 62%-72%, carbon with a mass content of ≤6%, and silicon with a mass content of ≤3%.

7. The surfacing electrode for gear wear repair according to claim 1, characterized in that, The diameter of the welding core is 1.5-2 mm, and the thickness of the welding skin is 0.5-1 mm.

8. The method of manufacturing a surfacing electrode for gear wear repair according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: Mixing the components by weight in the welding skin uniformly, and pressing and coating the welding core with a binder to obtain the surfacing electrode for gear wear repair.

9. The method of producing a surfacing electrode for gear wear repair according to claim 8, characterized in that, The binder comprises water glass.

10. The surfacing electrode for gear wear repair according to any one of claims 1-7 or prepared by the preparation method of the surfacing electrode for gear wear repair according to any one of claims 8-9, and application of the surfacing electrode in gear wear repair.

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