A titanium carbide boride full-phase ceramic flux-cored wire generated in situ and a preparation method thereof

Abstract

The application provides a kind of in-situ generated titanium borocarbide full-phase ceramic flux-cored wire and a preparation method thereof.The flux-cored wire includes a sheath and a core filled in the sheath.The chemical composition of the deposited metal of the flux-cored wire includes the following components by weight percentage: boron: 2.8-4.2%;carbon: 1.2-2.3%;silicon: 0.5-1.5%;manganese: 1.5-3.0%;copper: 0.4-1.3%;chromium: 3-6%;titanium: 1.2-3.0%;cerium: 0.2-0.7%;and the balance is iron.The preparation method is as follows: the core components are sequentially added to a dryer and dried for 2-3 hours, then put into a three-dimensional motion mixer for uniform mixing, and then put into a heat preservation box for heat preservation.The obtained core powder is reserved.The sheath is placed on a flux-cored wire forming machine, and rolled into a U-shaped groove by the forming machine.The core powder is added to the U-shaped groove, the forming machine rolls and closes the U-shaped groove, and then draws the U-shaped groove to obtain the flux-cored wire.The flux-cored wire prepared by the application has the characteristics of high wear resistance, high hardness and good high temperature resistance.

Description

Technical Field

[0001] The invention belongs to the field of material processing and welding materials, and in particular relates to an in-situ generated titanium carbide and boride full-complex ceramic flux-cored welding wire and a preparation method thereof. Background Art

[0002] Titanium borocarbide is an important boride material with excellent physical and chemical properties. Its oxidation resistance temperature in air can reach 1000°C, and it is stable in HCl and HF acids. It has good chemical stability, wear resistance, and electrical conductivity. Therefore, titanium borocarbide has a wide range of applications in various fields. For example, it can be used to manufacture rocket nozzles, electrical contacts, and high-temperature electrode materials. Furthermore, it can be combined with other materials to form composite materials for use in wire drawing dies, extrusion dies, sandblasting nozzles, sealing components, cutting tools, armor protection, and other materials. However, titanium borocarbide also suffers from the defects of high hardness and high brittleness (i.e., low toughness), which makes it prone to fracture when subjected to impact or stress concentration, limiting its further industrial application. Therefore, extensive research has been conducted to improve the properties of titanium borocarbide, and the concept of titanium borocarbide full-phase ceramics has been proposed based on this research.

[0003] Arc spraying technology has the advantages of high efficiency, low cost, and suitability for on-site and large-scale construction. It is the lowest-cost thermal spraying technology and the most suitable for large-scale promotion. However, the principle of arc spraying determines that it can only be used to spray conductive low-melting point metal wires initially, and it is difficult to directly obtain high-performance ceramic coatings with high melting point, high hardness, high wear resistance, and non-conductivity. Compared with solid wire, arc spray powder core wire combines the advantages of both outer skin and inner core materials. It not only overcomes the difficulty of drawing wire with high alloy or intermetallic compound components, but also allows non-conductive ceramic granular materials to be filled into the flux core. This has enabled arc spraying technology to be successfully applied to the preparation of ceramic, metal ceramic and intermetallic compound coatings, broadened the application field of arc spray coating materials, and promoted the rapid development of arc spray technology.

[0004] At present, arc sprayed ceramic coatings are mostly prepared by directly filling and spraying ceramic materials into the core. During the spraying process, there are prominent problems such as difficulty in completely melting the ceramic material, uneven distribution of the ceramic phase, and weak bonding between the coating layers, which have a significant adverse effect on the coating performance. Alternatively, a small amount of reactive components is added to the metal or alloy, and the ceramic phase is synthesized by reaction during the spraying process to obtain a hard phase particle-reinforced metal-based composite coating to improve the coating's wear resistance and high temperature resistance. However, due to the low content of the ceramic phase, the comprehensive performance of the coating, especially the high-temperature wear resistance, still cannot reach or approach that of a ceramic-based composite coating with ceramic as the main body.

[0005] Based on this, the present invention provides an in-situ generated titanium carbide boride full-complex phase ceramic flux-cored welding wire with high hardness, wear resistance and high temperature resistance. SUMMARY

[0006] An object of the present application is to provide a titanium carbide boride in-situ generating full composite ceramic flux-cored wire, and another object of the present application is to provide a preparation method of the titanium carbide boride in-situ generating full composite ceramic flux-cored wire.

[0007] To achieve the first object of the present application, the following technical solution is adopted:

[0008] A titanium carbide boride in-situ generating full composite ceramic flux-cored wire, the flux-cored wire comprising an outer skin and a core filled in the outer skin, the chemical composition of the deposited metal of the flux-cored wire comprising the following components in percentage by weight:

[0009] boron: 2.8-4.2%; carbon: 1.2-2.3%; silicon: 0.5-1.5%; manganese: 1.5-3.0%; copper: 0.4-1.3%; chromium: 3-6%; titanium: 1.2-3.0%; cerium: 0.2-0.7%; and the balance being iron.

[0010] The present application is further described as follows:

[0011] In the present application, each chemical component of the deposited metal of the flux-cored wire has a corresponding effect, which is as follows:

[0012] The boron (B) element has the effect of strengthening the matrix and generating hard phases, so that the flux-cored wire has high hardness and high melting point phases.

[0013] The carbon (C) element has the effect of strengthening the matrix and generating hard phases, so that the flux-cored wire has high hardness and high melting point phases.

[0014] The silicon (Si) element has the effect of strengthening the matrix and sutured grain boundaries, so that the grain boundaries between the grains in the flux-cored wire become more regular and compact, thereby improving the strength, plasticity and toughness of the flux-cored wire.

[0015] The manganese (Mn) element has the effect of strengthening and toughening the matrix, thereby improving the strength and toughness of the flux-cored wire, absorbing the energy generated during surfacing of the flux-cored wire, and reducing the generation and expansion of cracks.

[0016] The copper (Cu) element has the effect of refining the grains, purifying the structure, improving the weld strength of the flux-cored wire, and improving the corrosion resistance.

[0017] The chromium (Cr) element has the effect of neutralizing and optimizing the affinity between the matrix and the strengthening phase, and reducing the crack tendency, thereby reducing the generation of cracks in the flux-cored wire.

[0018] The titanium (Ti) element has the functions of refining grains, enhancing the initial nucleation of high-hardness reinforcing phase, enhancing the promotion of acicular ferrite structure in the deposited metal, and improving the toughness of the deposited metal.

[0019] The cerium (Ce) element has the functions of refining grains, purifying structure, improving the toughness and strength of the weld, and improving the stability of the arc, reducing spatter, and improving the forming of the weld.

[0020] Preferably, the chemical composition of the deposited metal of the flux-cored wire comprises the following components by weight percentage:

[0021] boron: 3.5%; carbon: 1.7%; silicon: 1.0%; manganese: 2.3%; copper: 0.8%; chromium: 4.5%; titanium: 2.1%; cerium: 0.5%; and iron: 83.6%.

[0022] Preferably, the flux-cored wire comprises the following components by weight fraction:

[0023] boron carbide: 4.2-6.2 parts; graphite: 1.1-2.0 parts; 75% ferrosilicon alloy: 0.8-2.3 parts; electrolytic manganese: 1.7-3.4 parts; pure copper: 0.4-1.3 parts; high-carbon chromium iron: 4.3-8.5 parts; 70% titanium iron powder: 2-5 parts; cerium oxide: 1.1-3.8 parts; and iron powder: 2.5-2.9 parts.

[0024] More preferably, the flux-cored wire comprises the following components by weight fraction:

[0025] boron carbide: 5.2 parts; graphite: 1.5 parts; 75% ferrosilicon alloy: 1.5 parts; electrolytic manganese: 2.6 parts; pure copper: 0.8 parts; high-carbon chromium iron: 6.4 parts; 70% titanium iron powder: 3.5 parts; cerium oxide: 0.8 parts; and iron powder: 2.7 parts.

[0026] In the present application, the sources of the chemical components of the deposited metal of the flux-cored wire are different, and further description is as follows:

[0027] The boron exists in the form of boron carbide, which has high wear resistance, high hardness, and good chemical stability, and the addition of boron carbide can improve the hardness and wear resistance of the flux-cored wire;

[0028] The carbon exists in the form of graphite, which has high-temperature resistance and can improve the high-temperature resistance of the flux-cored wire, and therefore, it can be used as the main source of carbon element in the flux-cored wire;

[0029] Silicon exists in the form of 75% ferrosilicon alloy, silicon atoms combine with iron atoms to form silicon-containing ferrite with strong covalent bond, which not only promotes the formation of ferrite, but also significantly strengthens the ferrite, the combination of the two improves the strength, plasticity and toughness of the flux-cored wire, therefore, 75% ferrosilicon alloy is used as the source of silicon element in the flux-cored wire.

[0030] Manganese exists in the form of electrolytic manganese, which has high strength and hardness, and also has certain plasticity and toughness, can improve the strength, hardness and toughness of the flux-cored wire, and can provide more manganese elements for the flux-cored wire;

[0031] Copper exists in the form of pure copper, which can improve the strength and hardness of the weld, and enhance the carrying capacity of the weld, therefore, it is used as the source of copper element in the flux-cored wire;

[0032] Chromium exists in the form of high-carbon chromium iron, which has good chemical stability, wear resistance and high hardness, etc., can improve the wear resistance and hardness of the flux-cored wire, therefore, it is used as the source of chromium element in the flux-cored wire;

[0033] Titanium exists in the form of 70% titanium-iron powder, by adding different amounts of titanium-iron directly into the flux powder of gas-protected flux-cored wire, under the conditions of rich argon and CO2 protective gas welding, titanium can be transferred to the deposited metal, and inclusions such as MnO-TiOx-Al2O3-SiO2 composite oxides can be generated, the existence of these inclusions helps to promote the formation of acicular ferrite structure, thereby improving the toughness of the deposited metal, at the same time, the addition of 70% titanium-iron powder can refine the grains, improve the hardness of the weld, and improve the impact toughness, because titanium element can combine with oxygen, nitrogen and other elements to form stable compounds, reduce the influence of harmful impurities, therefore, 70% titanium-iron powder is used as the source of titanium element in the flux-cored wire.

[0034] Cerium exists in the form of cerium oxide, which can be used as an arc stabilizer, it can stabilize the welding arc, reduce the fluctuation of the arc, thereby improving the stability of the welding process, and helps to reduce spatter, improve welding efficiency and weld quality; at the same time, cerium oxide has strong reducibility, it can react with oxygen during the welding process, play a deoxidizing role, help to prevent the formation of oxide inclusions in the weld, improve the mechanical properties and corrosion resistance of the weld; in addition, cerium oxide can have a metallurgical reaction with other elements in the weld, improve the chemical composition and mechanical properties of the weld metal, such as it can promote the refinement of the weld metal, improve the toughness and strength of the weld; in addition, cerium oxide can decompose to produce gas at high temperature, these gases can provide partial or most of the protection, prevent the weld metal from being oxidized by oxygen and nitrogen in the air during the welding process. Therefore, cerium oxide is used as the source of cerium element in the flux-cored wire.

[0035] Iron exists in the form of iron powder, which can be added into the flux-cored wire to form a weld with certain strength and toughness in combination with other metals.

[0036] Preferably, the flux-cored wire further comprises a ceramic reinforcing material, which is a mixture of zirconium oxide and aluminum carbide with an added mass ratio of 3:1. During the formation of the Mo2FeB2 ternary boride hard phase, the aluminum carbide and zirconium oxide particles will melt and gather together and be dispersed in the generated ceramic phase, thereby effectively improving the hardness and wear resistance of the surfacing metal.

[0037] Preferably, the sheath is a low-carbon steel strip with a thickness of 0.4 mm and a width of 14 mm.

[0038] Preferably, the diameter of the flux-cored wire is 1.6 mm.

[0039] Preferably, the filling rate of the flux powder in the flux core is 20-30%, and more preferably, the filling rate of the flux powder is 25%.

[0040] To achieve the second object of the present application, the following technical solution is adopted:

[0041] A preparation method of the in-situ generated titanium carbon boride full-composite ceramic flux-cored wire, comprising the following steps:

[0042] Step 1, sequentially adding each component of the flux core according to the formula into a drying machine with a temperature of 180-220℃ and drying for 2-3h, then putting it into a three-dimensional motion mixer for fully mixing, and then putting it into a temperature maintaining box with a temperature of 140-160℃ for temperature maintaining, and obtaining the flux core powder for standby;

[0043] Step 2, placing the sheath on a flux-cored wire forming machine, and rolling the sheath steel strip into a U-shaped groove by the forming machine;

[0044] Step 3, adding the flux core powder into the U-shaped groove, and rolling and closing the U-shaped groove with the added flux core powder by the forming machine and drawing it to obtain the flux-cored wire.

[0045] Preferably, the temperature in the three-dimensional motion mixer is 200℃.

[0046] Ceramic-based composite materials are composite materials made through a composite process using ceramic materials as a matrix and high-strength fibers, whiskers, chips and particles as reinforcements. They are usually also called multiphase ceramic materials or multiphase composite ceramic materials. Since ceramic materials have the advantages of high strength, high hardness, high temperature resistance, and good high-temperature wear performance, the present invention utilizes the advantages of ceramic materials to develop a flux-cored welding wire with high hardness, high temperature resistance and wear resistance. The flux-cored welding wire of the present invention is a full multiphase ceramic flux-cored welding wire that is generated in situ, that is, a reinforcing phase such as titanium boron carbide TiB2 is generated internally during the reaction process. It overcomes the defects of coarse reinforcement particle size, thermodynamic instability and low interface bonding strength in externally added composite materials.

[0047] Beneficial effects of the present invention:

[0048] ① In the present invention, the flux-cored welding wire has the characteristics of high hardness and wear resistance. The Rockwell hardness of the flux-cored welding wire of the present invention is greater than 67HRC; the Vickers hardness of the flux-cored welding wire of the present invention maintains the Vickers hardness of HV at 850°C. 10 Not less than 650, indicating that it has high temperature resistance; the wear resistance of the flux-cored welding wire of the present invention is 4.6 times that of Cr26 high chromium cast iron; the metallographic structure of the flux-cored welding wire of the present invention shows a dispersed distribution of hard phases to form a high volume density reinforcement phase, and no coarse crack defects are observed.

[0049] ② The preparation method of the flux-cored welding wire of the present invention is simple and is conducive to industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 The metallographic structure diagram and microhardness test diagram of single-layer surfacing of flux-cored welding wire according to Example 1 of the present invention;

[0051] Figure 2 This is a metallographic structure diagram and microhardness test diagram of single-layer surfacing of flux-cored wire in Example 2 of the present invention. DETAILED DESCRIPTION

[0052] The present invention can be further understood through the specific examples of the present invention given below, but they are not intended to limit the present invention.

[0053] Example 1

[0054] This embodiment 1 provides an in-situ generated titanium carbide and boride full-complex ceramic flux-cored welding wire, the flux-cored welding wire comprising an outer sheath and a flux core filled in the outer sheath, wherein the outer sheath is a low-carbon steel strip with a thickness of 0.4 mm and a width of 14 mm. The chemical composition of the deposited metal of the flux-cored welding wire, measured by weight percentage, includes the following components: boron: 2.8%; carbon: 1.2%; silicon: 0.5%; manganese: 1.5%; copper: 0.4%; chromium: 3%; titanium: 1.2%; cerium: 0.2%; and iron 89.2%.

[0055] In the present embodiment 1, the filling rate of the drug powder in the drug core is 20%, and the diameter of the flux-cored wire is 1.6 mm.

[0056] In the present embodiment 1, boron B is obtained from boron carbide; carbon C is obtained from graphite; silicon Si is obtained from 75% ferrosilicon alloy; manganese Mn is obtained from electrolytic manganese; copper Cu is obtained from pure copper; chromium Cr is obtained from high-carbon chromium iron; titanium Ti is obtained from 70% ferrotitanium powder; cerium Ce is obtained from cerium oxide; and iron Fe is obtained from iron powder.

[0057] The preparation steps of the in-situ generated titanium borocarbide full-composite ceramic flux-cored wire of the present embodiment 1 are as follows:

[0058] Step 1, boron carbide 4.2 parts, graphite 1.1 parts, 75% ferrosilicon alloy 0.8 parts, electrolytic manganese 1.7 parts, pure copper 0.4 parts, high-carbon chromium iron 4.3 parts, 70% ferrotitanium powder 2 parts, cerium oxide 1.1 parts, and iron powder 2.9 parts are sequentially added into a drying machine with a temperature of 180℃ and dried for 2 hours, then put into a three-dimensional motion mixer with a temperature of 200℃ and mixed uniformly, and then put into a temperature holding box with a temperature of 140℃ and hold, and the obtained drug core powder is reserved;

[0059] Step 2, a low-carbon steel strip with a thickness of 0.4 mm and a width of 14 mm is placed on a flux-cored wire forming machine, and the low-carbon steel strip is rolled into a U-shaped groove by the forming machine;

[0060] Step 3, add the drug core powder into the U-shaped groove, and the forming machine rolls and closes the U-shaped groove after adding the drug core powder and draws it to a wire diameter of 1.6 mm to obtain the flux-cored wire.

[0061] As shown in Figure 1 the present embodiment 1, the metallographic structure shows that the dispersed distribution of hard phase forms high volume density reinforcing phase to obtain high hardness of the deposited metal, and no coarse crack defects are observed.

[0062] Embodiment 2

[0063] The present embodiment 2 provides an in-situ generated titanium borocarbide full-composite ceramic flux-cored wire, which comprises an outer skin and a drug core filled in the outer skin, wherein the outer skin is a low-carbon steel strip with a thickness of 0.4 mm and a width of 14 mm, and the chemical composition of the deposited metal of the flux-cored wire comprises the following components by weight percentage: boron: 3.5%; carbon: 1.7%; silicon: 1.0%; manganese: 2.3%; copper: 0.8%; chromium: 4.5%; titanium: 2.1%; cerium: 0.5%; and iron: 83.6%.

[0064] In the present embodiment 2, the filling rate of the drug powder in the drug core is 25%, and the diameter of the flux-cored wire is 1.6 mm.

[0065] In this embodiment 2, boron B is obtained from boron carbide; carbon C is obtained from graphite; silicon Si is obtained from 75% ferrosilicon alloy; manganese Mn is obtained from electrolytic manganese; copper Cu is obtained from pure copper; chromium Cr is obtained from high-carbon ferrochrome; titanium Ti is obtained from 70% ferrotitanium powder; cerium Ce is obtained from cerium oxide; and iron Fe is obtained from iron powder.

[0066] The preparation steps of the in-situ generated titanium carboride full-complex ceramic flux-cored welding wire of Example 2 are as follows:

[0067] Step 1, 5.2 parts of boron carbide, 1.5 parts of graphite, 1.5 parts of 75% ferrosilicon alloy, 2.6 parts of electrolytic manganese, 0.8 parts of pure copper, 6.4 parts of high carbon ferrochrome, 3.5 parts of 70% ferrotitanium powder, 0.8 parts of cerium oxide and 2.7 parts of iron powder are sequentially added to a dryer at a temperature of 200°C and dried for 2.5 hours, then placed in a three-dimensional motion mixer at a temperature of 200°C and fully mixed, and then placed in an insulation box at a temperature of 150°C for insulation, and the obtained core powder is set aside;

[0068] Step 2: Place a low-carbon steel strip with a thickness of 0.4 mm and a width of 14 mm on a flux-cored wire forming machine, and use the forming machine to roll the low-carbon steel strip into a U-shaped groove;

[0069] Step 3: Add flux core powder to the U-shaped groove. The forming machine rolls the U-shaped groove after adding the flux core powder and draws it to a wire diameter of 1.6 mm to obtain a flux cored welding wire.

[0070] like Figure 2 As shown, the metallographic structure of Example 2 is characterized by a dispersed distribution of hard phases to form a high volume density reinforcement phase to obtain a high hardness deposited metal, and no coarse crack defects are observed.

[0071] Example 3

[0072] This embodiment 3 provides an in-situ generated titanium carbide and boride full-phase ceramic flux-cored welding wire, the flux-cored welding wire comprising an outer sheath and a flux core filled in the outer sheath, wherein the outer sheath is a low-carbon steel strip with a thickness of 0.4 mm and a width of 14 mm, and the chemical composition of the deposited metal of the flux-cored welding wire, measured by weight percentage, includes the following components: boron: 4.2%; carbon: 2.3%; silicon: 1.5%; manganese: 3.0%; copper: 1.3%; chromium: 6%; titanium: 3.0%; cerium: 0.7%; and iron 78%.

[0073] In this embodiment 3, the powder filling rate in the flux core is 30%, and the diameter of the flux-cored welding wire is 1.6 mm.

[0074] In this embodiment 3, boron B is obtained from boron carbide; carbon C is obtained from graphite; silicon Si is obtained from 75% ferrosilicon alloy; manganese Mn is obtained from electrolytic manganese; copper Cu is obtained from pure copper; chromium Cr is obtained from high-carbon chromium iron; titanium Ti is obtained from 70% titanium-iron powder; cerium Ce is obtained from cerium oxide; iron Fe is obtained from iron powder.

[0075] The preparation steps of the in-situ generated carbon titanium boride full composite ceramic flux-cored wire of this embodiment 3 are as follows:

[0076] Step 1, boron carbide 6.2 parts, graphite 2.0 parts, 75% ferrosilicon alloy 2.3 parts, electrolytic manganese 3.4 parts, pure copper 1.3 parts, high-carbon chromium iron 8.5 parts, 70% titanium-iron powder 5 parts, cerium oxide 3.8 parts and iron powder 2.5 parts are sequentially added into a drying machine with a temperature of 220℃ and dried for 3h, then put into a three-dimensional motion mixer with a temperature of 200℃ and mix uniformly, then put into a temperature holding box with a temperature of 160℃ and hold, and the obtained flux-cored powder is prepared for use;

[0077] Step 2, a low-carbon steel strip with a thickness of 0.4mm and a width of 14mm is placed on a flux-cored wire forming machine, and the low-carbon steel strip is rolled into a U-shaped groove by the forming machine;

[0078] Step 3, add the flux-cored powder into the U-shaped groove, and the forming machine rolls and closes the U-shaped groove after adding the flux-cored powder and draws it to a wire diameter of 1.6mm to obtain the flux-cored wire.

[0079] The flux-cored wire of this embodiment 3 has no large crack defects.

[0080] Embodiment 4

[0081] This embodiment 4 provides an in-situ generated carbon titanium boride full composite ceramic flux-cored wire, which comprises an outer skin and a flux core filled in the outer skin, wherein the outer skin is a low-carbon steel strip with a thickness of 0.4mm and a width of 14mm, and the chemical composition of the deposited metal of the flux-cored wire comprises the following components by weight percentage: boron: 3.5%; carbon: 1.7%; silicon: 1.0%; manganese: 2.3%; copper: 0.8%; chromium: 4.5%; titanium: 2.1%; cerium: 0.5%; zirconium: 0.2%; aluminum: 0.1%; and iron: 83.3%.

[0082] In this embodiment 4, the filling rate of the flux powder in the flux core is 25%, and the diameter of the flux-cored wire is 1.6mm.

[0083] In this embodiment 4, boron B is obtained from boron carbide; carbon C is obtained from graphite; silicon Si is obtained from 75% ferrosilicon alloy; manganese Mn is obtained from electrolytic manganese; copper Cu is obtained from pure copper; chromium Cr is obtained from high-carbon chromium iron; titanium Ti is obtained from 70% titanium-iron powder; cerium Ce is obtained from cerium oxide; zirconium Zr is obtained from zirconium oxide; aluminum Al is obtained from aluminum carbide; and iron Fe is obtained from iron powder.

[0084] The preparation steps of the in-situ generated titanium carbon boride full-phase ceramic core wire of this embodiment 4 are as follows:

[0085] Step 1, boron carbide 5.2 parts, graphite 1.5 parts, 75% ferrosilicon alloy 1.5 parts, electrolytic manganese 2.6 parts, pure copper 0.8 parts, high-carbon chromium iron 6.4 parts, 70% titanium-iron powder 3.5 parts, cerium oxide 2.7 parts, 0.3 parts of zirconium oxide, 0.1 parts of aluminum carbide and iron powder 2.7 parts are sequentially added into a drying machine with a temperature of 200℃ and dried for 2.5h, then put into a three-dimensional motion mixer with a temperature of 200℃ and mix uniformly, then put into a temperature holding box with a temperature of 150℃ and hold, and the obtained core powder is prepared for use;

[0086] Step 2, a low-carbon steel strip with a thickness of 0.4mm and a width of 14mm is placed on the core wire forming machine, and the low-carbon steel strip is rolled into a U-shaped groove by the forming machine;

[0087] Step 3, add the core powder into the U-shaped groove, and the forming machine rolls and closes the U-shaped groove after adding the core powder and draws it to a wire diameter of 1.6mm to obtain the core wire.

[0088] The core wire of this embodiment 4 has no large crack defects.

[0089] Example 5

[0090] Wear resistance test

[0091] The core wires prepared in examples 1-4 and the market sold Cr26 high chromium cast iron are tested for wear resistance according to the loose abrasive wear test method of rubber wheel method in JB / T 7705-1995, and the test results are shown in Table 1.

[0092] Table 1 Wear resistance test results

[0093] Test group Initial mass m1 / g Mass after wear m2 / g Mass loss after wear Δm / g Example 1 65.187 65.137 0.050 Example 2 65.195 65.147 0.048 Example 3 65.198 65.146 0.052 Example 4 65.181 65.135 0.046 Cr26 high chromium cast iron 65.204 64.983 0.221

[0094] Example 6

[0095] Hardness test

[0096] According to the test methods in GB / T 230.1-2009 Metallographic Test Method for Rockwell Hardness of Metallic Materials and GB / T 4340.1-2009 Metallographic Test Method for Vickers Hardness of Metallic Materials, the Rockwell hardness performance test and the Vickers hardness performance test of the flux-cored wires prepared in Examples 1-4 were carried out, and the test results are shown in Tables 2 and 3, respectively.

[0097] Table 2 Rockwell hardness performance test results

[0098] Test group Example 1 Example 2 Example 3 Example 4 Rockwell hardness HRC 67.6 67.7 67.4 67.9

[0099] Table 3 Vickers hardness performance test results

[0100] Test group Example 1 Example 2 Example 3 Example 4 850°c vickers hardness hv 10 ]] 655 661 652 663

[0101] The results of Tables 1-3 above were analyzed as follows:

[0102] From the results of Table 1, it can be seen that the abrasion weight loss of the flux-cored wires prepared in Examples 1-4 is obviously lower than that of the Cr26 high-chromium cast iron, wherein the abrasion weight loss of the Cr26 high-chromium cast iron is 4.6 times (times = abrasion weight loss of Cr26 high-chromium cast iron ÷ abrasion weight loss of the flux-cored wire prepared in Example 2) of that of the flux-cored wire prepared in Example 2.

[0103] From the results of Table 2, it can be seen that the Rockwell hardness of the flux-cored wires prepared in Examples 1-4 is greater than 67 HRC.

[0104] From the results of Table 3, it can be seen that the Vickers hardness of the flux-cored wires prepared in Examples 1-4 can still be maintained to be greater than 650 HV at a temperature of 850℃. 10 .

[0105] From the results of Tables 1-3, it can be seen that, compared with the results of Examples 1-3, the abrasion resistance, Rockwell hardness and Vickers hardness of Example 4 are all superior to those of Examples 1-3 under the same conditions, and the difference between Example 4 and Examples 1-3 lies in that the ceramic reinforcing material obtained by mixing zirconium oxide and aluminum carbide is added in Example 4. In the process of forming the Mo2FeB2 ternary boride hard phase, the aluminum carbide and zirconium oxide particles will be melted and gathered together and dispersedly distributed in the generated ceramic phase, thereby effectively improving the hardness and abrasion resistance of the surfacing metal.

[0106] The above description is only the implementation of the present application, and the protection scope of the present application is not limited to the above examples. Any technical solution falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements without departing from the principle of the present application shall also be considered as falling within the protection scope of the present application.

Claims

1. An in-situ generated titanium carboride full-phase ceramic flux-cored welding wire, the flux-cored welding wire comprising an outer sheath and a flux core filled in the outer sheath, characterized in that: The chemical composition of the deposited metal of the flux-cored welding wire comprises the following components by weight percentage: Boron: 2.8-4.2%; Carbon: 1.2-2.3%; Silicon: 0.5-1.5%; Manganese: 1.5-3.0%; Copper: 0.4-1.3%; Chromium: 3-6%; Titanium: 1.2-3.0%; Cerium: 0.2-0.7%; the balance is iron; The flux-cored welding wire comprises the following components in parts by weight: 5.2 parts of boron carbide; 1.5 parts of graphite; 1.5 parts of 75% ferrosilicon alloy; 2.6 parts of electrolytic manganese; 0.8 parts of pure copper; 6.4 parts of high carbon ferrochrome; 70% ferrotitanium powder 3.5 parts; cerium oxide 0.8 parts; iron powder 2.7 parts; The flux-cored welding wire further includes a ceramic reinforcement material, which is a mixture of zirconium oxide and aluminum carbide, and the added mass ratio of the zirconium oxide to the aluminum carbide is 3:

1.

2. The in-situ generated titanium carboride full-phase ceramic flux-cored welding wire according to claim 1, characterized in that: The chemical composition of the deposited metal of the flux-cored welding wire comprises the following components by weight percentage: Boron: 3.5%; Carbon: 1.7%; Silicon: 1.0%; Manganese: 2.3%; Copper: 0.8%; Chromium: 4.5%; Titanium: 2.1%; Cerium: 0.5%; Iron: 83.6%.

3. The in-situ generated titanium carboride full-complex ceramic flux-cored welding wire according to claim 1, characterized in that: The outer skin is a low-carbon steel strip with a thickness of 0.4 mm and a width of 14 mm.

4. The in-situ generated titanium boron carbide full-complex ceramic flux-cored welding wire according to claim 1, characterized in that: The diameter of the flux-cored welding wire is 1.6 mm.

5. The in-situ generated titanium carbide boride full-complex ceramic flux-cored welding wire according to claim 1, characterized in that: The filling rate of the medicine powder in the medicine core is 25%.

6. A method for preparing an in-situ generated titanium boron carbide composite ceramic flux-cored welding wire according to any one of claims 1 to 5, characterized in that: The preparation method comprises the following steps: Step 1: Add the components of the core according to the formula in a drying machine at a temperature of 180-220°C for 2-3 hours, then put them into a three-dimensional motion mixer to mix them thoroughly, and then put them into an insulation box at a temperature of 140-160°C to keep them warm. The obtained core powder is set aside; Step 2: placing the outer skin on a flux-cored wire forming machine, and rolling the outer skin steel strip into a U-shaped groove by the forming machine; Step 3: Add the flux core powder to the U-shaped groove, and the forming machine rolls and closes the U-shaped groove after adding the flux core powder and pulls it to obtain a flux cored welding wire.

7. The method for preparing the in-situ generated titanium boron carbide composite ceramic flux-cored welding wire according to claim 6, characterized in that: The temperature inside the three-dimensional motion mixer was 200°C.

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