Conductive eutectic material with high corrosion resistance

Abstract

The invention discloses a high-corrosion-resistance conductive eutectic material which comprises tungsten carbide, titanium carbide, zirconium oxide, aluminum oxide, vanadium carbide, chromium carbide and yttrium oxide, tungsten carbide, titanium carbide, zirconium oxide and aluminum oxide are mixed and sintered to form the eutectic material, and vanadium carbide, chromium carbide and yttrium oxide are added. According to the high-corrosion-resistance conductive eutectic material, the eutectic material does not contain metal binding phases such as cobalt and nickel, has high toughness and high conductivity of metal, has high wear resistance and self-lubricating property of ceramic, and has the characteristics of electric conduction and non-magnetic conduction; when the eutectic material is used as a high-speed reciprocating friction cutting device material, a processed material cannot accumulate and condense on the surface of the eutectic material in a high-speed reciprocating friction working condition environment, the durable wear-resistant service life is 8-10 times of that of an existing hard alloy material, and the eutectic material has long-term excellent use performance and is suitable for industrial production. The significance on cost reduction and benefit increase is great.

Description

Technical Field

[0001] The present invention relates to the technical field of eutectic material preparation, and particularly relates to a highly wear-resistant and conductive eutectic material. Background Art

[0002] A eutectic material is a crystalline material formed by two or more different molecules in the same crystal lattice in a fixed stoichiometric ratio through non-ionic and non-covalent bonds. The materials commonly used in existing high-speed reciprocating cutting devices are generally cemented carbide materials (tungsten carbide materials or titanium carbide materials): with WC (tungsten carbide) or TiC (titanium carbide) as the main material and metals such as cobalt (Co) and nickel (Ni) as the binder phase.

[0003] Cobalt (Co) has excellent wettability and temperature-dependent solubility for WC or TiC powders in cemented carbide, which helps with sintering; as the cobalt content increases, the hardness, corrosion resistance, oxidation resistance, and high-temperature resistance of the cemented carbide become worse.

[0004] Nickel (Ni) has good wettability for WC or TiC powders in cemented carbide and can prevent carbide particles from agglomerating to form a uniform structure with fine particles, thus improving the corrosion resistance and oxidation resistance of the alloy.

[0005] Cemented carbide is a powder metallurgy material made by powder mixing, pressing, and sintering of refractory metal carbides WC and metal binder phase materials. WC-Co or TiC cemented carbide is one of the most common cemented carbides, with WC or TiC as the main stable phase and cobalt as the binder phase between WC particles. It is widely used in molds, cutting tools, mining drill bits, and other special tools due to its high hardness, good toughness, and wear resistance. With the continuous development of technology, people's requirements for cemented carbide materials are also getting higher and higher.

[0006] Existing cemented carbide materials have certain drawbacks when in use. For current cemented carbides (WC or TiC with added metallic binder phases), in a high-speed reciprocating friction environment, the internal metallic binder phases such as cobalt (Co) and nickel (Ni) will be gradually lost due to high-temperature erosion and external environmental corrosion, resulting in a large number of voids in the WC or TiC matrix of the cemented carbide. And in these voids, the material to be processed will accumulate (when this patent product is used as the material for high-speed reciprocating cutting devices, the materials to be processed are mostly metal alloy materials such as copper alloys, nickel alloys, and aluminum alloys with relatively thin thicknesses, alloy material thickness: 0 - 5 mm). These metal alloy materials will gradually accumulate in the WC or TiC matrix, leading to the continuous accumulation and condensation of the metal alloy materials on the surface of the cemented carbide. At the same time, because current cemented carbides generally have magnetism due to the presence of metallic binder phases such as cobalt (Co) and nickel (Ni) in the WC or TiC matrix, this further exacerbates the continuous accumulation and condensation of the metal alloy materials on the surface of the cemented carbide under high-speed reciprocating friction conditions. These will greatly accelerate the wear and aging speed of the cemented carbide in a high-speed reciprocating friction environment (such as surface cracking, accelerated wear, breakage, etc.), which has a great impact on the service life of cemented carbide tools. Therefore, we propose a highly wear-resistant and conductive eutectic material. Summary of the Invention

[0007] Technical problems to be solved: Aiming at the deficiencies of the prior art, the present invention provides a highly wear-resistant and conductive eutectic material. This eutectic material does not contain metallic binder phases such as cobalt and nickel, has high toughness and high electrical conductivity of metals, and at the same time has high wear resistance and self-lubricity of ceramics. Moreover, this eutectic material has the characteristics of being conductive but not magnetic. When used as the material for high-speed reciprocating friction cutting devices, in a high-speed reciprocating friction working environment, there will be no accumulation and condensation of the material to be processed on its surface. Its long-lasting wear resistance service life is 8 - 10 times that of the current cemented carbide materials, with excellent long-term use performance, which is of great significance for cost reduction and efficiency increase, and can effectively solve the problems in the background technology.

[0008] Technical solution: To achieve the above object, the technical solution adopted by the present invention is: A highly wear-resistant and conductive eutectic material, including tungsten carbide, titanium carbide, zirconia, alumina, vanadium carbide, chromium carbide and yttrium oxide. The tungsten carbide, titanium carbide, zirconia and alumina are mixed and sintered to form a eutectic material, and vanadium carbide, chromium carbide and yttrium oxide are added. The eutectic material is used as the die material for high-speed reciprocating cutting processing. There are four mixed sintering structures between the tungsten carbide, titanium carbide, zirconia and alumina; In the first mixed sintering structure, a method of mixing and sintering tungsten carbide and zirconia is adopted; In the second mixed sintering structure, a method of mixing and sintering tungsten carbide and alumina is adopted; In the third hybrid sintered structure, a method of hybrid sintering titanium carbide and zirconia is adopted; In the fourth hybrid sintered structure, a method of hybrid sintering titanium carbide and alumina is adopted.

[0009] As a preferred technical solution of the present application, when tungsten carbide and zirconia are hybrid sintered, the particle size of tungsten carbide is 0 - 1300 nm, and the mass content is 30% - 85%, and the particle size of zirconia is 0 - 960 nm, and the mass content is 3% - 75%.

[0010] As a preferred technical solution of the present application, when tungsten carbide and alumina are hybrid sintered, the particle size of tungsten carbide is 0 - 1300 nm, and the mass content is 30% - 85%, and the particle size of alumina is 0 - 960 nm, and the mass content is 3% - 75%.

[0011] As a preferred technical solution of the present application, when titanium carbide and zirconia are hybrid sintered, the particle size of titanium carbide is 0 - 1300 nm, and the mass content is 30% - 85%, and the particle size of zirconia is 0 - 960 nm, and the mass content is 3% - 75%.

[0012] As a preferred technical solution of the present application, when titanium carbide and alumina are hybrid sintered, the particle size of titanium carbide is 0 - 1300 nm, and the mass content is 30% - 85%, and the particle size of alumina is 0 - 960 nm, and the mass content is 3% - 75%.

[0013] As a preferred technical solution of the present application, the particle size of vanadium carbide is 0 - 860 nm, and the mass content is 0 - 3.5%.

[0014] As a preferred technical solution of the present application, the particle size of chromium carbide is 0 - 900 nm, and the mass content is 0 - 5.3%.

[0015] As a preferred technical solution of the present application, the particle size of yttrium oxide is 0 - 1200 nm, and the mass content is 0 - 6.5%.

[0016] Advantages: Compared with the prior art, the present invention provides a highly wear-resistant conductive eutectic material, which has the following advantages: When used as the material for high-speed reciprocating friction cutting devices, this highly wear-resistant conductive eutectic material will not cause the accumulation and condensation of the processed material on its surface under the working conditions of high-speed reciprocating friction. Its long-lasting wear-resistant service life is 8-10 times that of the current cemented carbide material, with excellent long-term use performance, which is of great significance for cost reduction and efficiency improvement; The WC (tungsten carbide) or TiC (titanium carbide) matrix material is innovatively mixed and sintered with ZrO2 (zirconia) or Al2O3 (aluminum oxide) to form a eutectic material, and this eutectic material is creatively applied to the die material for high-speed reciprocating cutting processing. It not only has metal characteristics (high toughness, high conductivity), but also has ceramic characteristics (high wear resistance, self-lubricating performance); Since this highly wear-resistant eutectic material does not contain metal bonding phases such as cobalt (Co) and nickel (Ni), it has the characteristic of non-magnetic conduction (conductive but non-magnetic). Conductive but non-magnetic, which is more conducive to avoiding the continuous accumulation and condensation of the metal alloy material (thickness: 0-5 mm) on the surface of this eutectic material during high-speed processing. The entire eutectic material has a simple structure, convenient operation, and better use effects compared with the traditional method. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is a schematic diagram of the overall structure of a highly wear-resistant conductive eutectic material of the present invention.

[0018] Figure 2 FIG. is a schematic diagram of the strength of a highly wear-resistant conductive eutectic material of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings and specific embodiments. However, those skilled in the art will understand that the following described embodiments are some embodiments of the present invention, not all embodiments, and are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention. Those not specified in the embodiments are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments not specified by the manufacturer are all conventional products that can be obtained through commercial purchase.

[0020] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] As Figure 1 , 2 shown, a highly wear-resistant conductive eutectic material includes tungsten carbide, titanium carbide, zirconia, alumina, vanadium carbide, chromium carbide and yttrium oxide. Tungsten carbide, titanium carbide, zirconia and alumina are mixed and sintered to form a eutectic material, and vanadium carbide, chromium carbide and yttrium oxide are added. The eutectic material is used as a die material for high-speed reciprocating cutting. Four mixed sintering structures are set between tungsten carbide, titanium carbide, zirconia and alumina; In the first mixed sintering structure, a method of mixing and sintering tungsten carbide and zirconia is adopted; In the second mixed sintering structure, a method of mixing and sintering tungsten carbide and alumina is adopted; In the third mixed sintering structure, a method of mixing and sintering titanium carbide and zirconia is adopted; In the fourth mixed sintering structure, a method of mixing and sintering titanium carbide and alumina is adopted.

[0023] When used as a material for high-speed reciprocating friction cutting devices, under the working conditions of high-speed reciprocating friction, there will be no cumulative condensation of the machined material on its surface. The durable wear-resistant service life is 8-10 times that of the current cemented carbide materials, and it has long-term excellent use performance, which is of great significance for cost reduction and efficiency improvement.

[0024] This highly wear-resistant eutectic material does not contain metal bonding phases such as cobalt (Co) and nickel (Ni). Therefore, this material has the property of non-magnetic conductivity (conductive but non-magnetic), which is more conducive to avoiding the continuous cumulative condensation phenomenon of metal alloy materials (thickness: 0 - 5 mm) on the surface of this eutectic material during high-speed machining.

[0025] Furthermore, when tungsten carbide and zirconia are mixed and sintered, the particle size of tungsten carbide is 0 - 1300 nm, and the mass content is 30% - 85%; the particle size of zirconia is 0 - 960 nm, and the mass content is 3% - 75%.

[0026] Furthermore, when tungsten carbide and alumina are mixed and sintered, the particle size of tungsten carbide is 0 - 1300 nm, and the mass content is 30% - 85%; the particle size of alumina is 0 - 960 nm, and the mass content is 3% - 75%.

[0027] Furthermore, when titanium carbide and zirconia are mixed and sintered, the particle size of titanium carbide is 0 - 1300 nm, and the mass content is 30% - 85%; the particle size of zirconia is 0 - 960 nm, and the mass content is 3% - 75%.

[0028] Furthermore, when titanium carbide and alumina are mixed and sintered, the particle size of titanium carbide is 0 - 1300 nm, and the mass content is 30% - 85%; the particle size of alumina is 0 - 960 nm, and the mass content is 3% - 75%.

[0029] Furthermore, the particle size of vanadium carbide is 0 - 860 nm, and the mass content is 0 - 3.5%.

[0030] Furthermore, the particle size of chromium carbide is 0 - 900 nm, and the mass content is 0 - 5.3%.

[0031] Furthermore, the particle size of yttrium oxide is 0 - 1200 nm, and the mass content is 0 - 6.5%.

[0032] Since it does not contain metal bonding phases such as cobalt (Co) and nickel (Ni), when the eutectic material of this application is used as the material for high-speed reciprocating friction cutting devices, under the working conditions of high-speed reciprocating friction, there will be no cumulative condensation of the processed material (mostly thin metal alloy materials) on its (the eutectic material of this patent) surface.

[0033] Innovatively mix and sinter WC (tungsten carbide) or TiC (titanium carbide) matrix materials with ZrO2 (zirconia) or Al2O3 (alumina) to form a eutectic material, and creatively apply this eutectic material to the die material for high-speed reciprocating cutting processing.

[0034] This highly wear-resistant eutectic material does not contain metal bonding phases such as cobalt (Co) and nickel (Ni). Therefore, this material has the property of non-magnetic conduction (conductive but non-magnetic), which is more conducive to avoiding the continuous cumulative condensation phenomenon of metal alloy materials (thickness: 0 - 5 mm) on the surface of this eutectic material during high-speed machining.

[0035] The material of this application has both metal properties (high toughness and high electrical conductivity) and ceramic properties (high wear resistance and self-lubricating performance).

[0036] The composition ratio and particle size of the raw materials (excluding metal bonding phases such as cobalt (Co) and nickel (Ni)): Matrix material 1: WC (tungsten carbide) or TiC (titanium carbide), Particle size: 0 - 1300 nm, mass content: 30% - 85%; Matrix material 2: ZrO2 (zirconia) or Al2O3 (aluminum oxide), Particle size: 0 - 960 nm, mass content: 3% - 75%; VC (vanadium carbide), Particle size: 0 - 860 nm, mass content: 0 - 3.5%; Cr3C2 (chromium carbide), Particle size: 0 - 900 nm, mass content: 0 - 5.3%; Y2O3 (yttrium oxide), Particle size: 0 - 1200 nm, mass content: 0 - 6.5%.

[0037] 1. Raw material preparation and mixing (excluding metal bonding phases such as cobalt (Co) and nickel (Ni)) Composition ratio: Mix according to the ratio.

[0038] Wet ball milling: Mix the raw material powder with a liquid medium such as alcohol or acetone, and wet mill it in a ball mill until it is uniform to form a slurry.

[0039] Drying and sieving: After removing the liquid medium, add a molding agent (such as paraffin or PEG), and obtain a well-fluidized mixture through drying and sieving.

[0040] 2. Molding process Compression molding: Fill the mixture into a forming mold, and apply pressure (pressure range 1 - 300 MPa) through mechanical or cold isostatic pressing to form a green body with a predetermined shape.

[0041] 3. Sintering process The sintering process is carried out in a vacuum or a furnace protected by hydrogen or argon (applying a certain pressure). The sintering is divided into four key stages: 1). Debinding stage (about 200 - 650 °C): Volatilize the residual binder and initially remove gas impurities.

[0042] 2). Solid-phase sintering stage (800 °C - eutectic temperature): Diffusion between particles is enhanced, and the green body begins to shrink and form a preliminary structure.

[0043] 3). Liquid-phase sintering stage (1350 - 2650 °C): Reach the melting point to form a liquid phase, and the material particles gradually densify through the dissolution-precipitation mechanism.

[0044] 4). Cooling stage: Control the cooling rate to optimize the crystal phase distribution and obtain the desired mechanical properties.

[0045] It should be noted that in this article, relational terms such as first and second (No. 1, No. 2, etc.) are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A highly corrosion-resistant conductive eutectic material comprising tungsten carbide, titanium carbide, zirconium oxide, aluminum oxide, vanadium carbide, chromium carbide and yttrium oxide, characterized in that: The tungsten carbide, titanium carbide, zirconium oxide and aluminum oxide are mixed and sintered to form a eutectic material, and vanadium carbide, chromium carbide and yttrium trioxide are added. The eutectic material is applied to mold materials for high-speed reciprocating cutting. Four mixed sintering structures are set between the tungsten carbide, titanium carbide, zirconium oxide and aluminum oxide; In the first mixed sintering structure, tungsten carbide and zirconium oxide are mixed and sintered; In the second mixed sintering structure, tungsten carbide and alumina are mixed and sintered; In the third mixed sintering structure, titanium carbide and zirconium oxide are mixed and sintered; In the fourth mixed sintering structure, titanium carbide and aluminum oxide are mixed and sintered.

2. The highly corrosion-resistant conductive eutectic material according to claim 1, characterized in that: When the tungsten carbide and zirconium oxide are mixed and sintered, the particle size of the tungsten carbide is 0-1300nm, and the mass content is 30%-85%, and the particle size of the zirconium oxide is 0-960nm, and the mass content is 3%-75%.

3. The highly corrosion-resistant conductive eutectic material according to claim 1, characterized in that: When the tungsten carbide and alumina are mixed and sintered, the particle size of the tungsten carbide is 0-1300nm, and the mass content is 30%-85%, and the particle size of the alumina is 0-960nm, and the mass content is 3%-75%.

4. The highly corrosion-resistant conductive eutectic material according to claim 1, characterized in that: When the titanium carbide and zirconium oxide are mixed and sintered, the particle size of the titanium carbide is 0-1300nm, and the mass content is 30%-85%, and the particle size of the zirconium oxide is 0-960nm, and the mass content is 3%-75%.

5. The highly corrosion-resistant conductive eutectic material according to claim 1, characterized in that: When the titanium carbide and aluminum oxide are mixed and sintered, the titanium carbide has a particle size of 0-1300 nm and a mass content of 30%-85%, and the aluminum oxide has a particle size of 0-960 nm and a mass content of 3%-75%.

6. The highly corrosion-resistant conductive eutectic material according to claim 1, characterized in that: The vanadium carbide has a particle size of 0-860 nm and a mass content of 0-3.5%.

7. The highly corrosion-resistant conductive eutectic material according to claim 1, characterized in that: The chromium carbide particle size is 0-900nm, and the mass content is 0-5.3%.

8. The highly corrosion-resistant conductive eutectic material according to claim 1, characterized in that: The particle size of the yttrium trioxide is 0-1200nm, and the mass content is 0-6.5%.

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