Hard metal forming agent, method for its production and use

Abstract

The application discloses a cementing agent for cemented carbide and a preparation method and application thereof. The cementing agent for cemented carbide comprises a fatty hydrocarbon component and a carbonate component, wherein the mass ratio of the fatty hydrocarbon component and the carbonate component is 1:1-19:1, and the carbonate component comprises an aliphatic cyclic carbonate and / or an aliphatic chain carbonate. The cementing agent for cemented carbide is easy to sinter and remove, has low carbon residue, and can effectively improve the structural performance of the cemented carbide.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cemented carbide preparation, and particularly relates to a cemented carbide forming agent and a preparation method and application thereof. BACKGROUND

[0002] Cemented carbide has excellent properties of high hardness and high toughness, and has become one of the most widely used products in the world of powder metallurgy products. With the continuous improvement of automation, to meet the mechanical cutting and processing efficiency, high-precision processing industry not only puts forward higher requirements for the comprehensive performance of cemented carbide tools, but also brings more difficulties to forming for complex-shaped products. Compared with traditional die forming, injection forming, extrusion forming and 3D printing technology are suitable for complex forming of cemented carbide, and high-performance forming agent matched therewith is a key technology of the forming process.

[0003] The existing cemented carbide forming agent is difficult to form complex shapes, which can cause problems such as difficulty in carbon control, cracks at stress concentration sites of cemented carbide, and affects the performance of cemented carbide. SUMMARY

[0004] The application provides a cemented carbide forming agent, a preparation method and application thereof. The cemented carbide forming agent of the application is easy to sinter and remove, has low carbon residue, and can effectively improve the structural performance of cemented carbide.

[0005] In a first aspect, a cemented carbide forming agent includes a fatty hydrocarbon component and a carbonate component, wherein the mass ratio of the fatty hydrocarbon component and the carbonate component is 1:1 to 19:1, and the carbonate component includes an aliphatic cyclic carbonate and / or an aliphatic chain carbonate.

[0006] The cemented carbide forming agent provided in the application has good wettability and formability with cemented carbide powder, and the cemented carbide forming agent provided in the application is easy to sinter and remove, has low carbon residue, and has excellent comprehensive performance.

[0007] In addition, when the mass ratio of the fatty hydrocarbon component and the carbonate component is 1:1 to 19:1, on the one hand, the cemented carbide forming agent provided in the application can be better adsorbed on the surface of the cemented carbide powder particles, so that the bonding force between the powders is enhanced, which helps to form a stable green body in the pressing process and reduces the damage of the green body, and on the other hand, when the cemented carbide forming agent provided in the application is mixed with the cemented carbide powder, the powder can flow and fill the mold more easily, thereby improving the efficiency and precision of forming, and the cemented carbide forming agent is particularly suitable for preparing complex-shaped cemented carbide products.

[0008] In a first possible implementation, the aliphatic cyclic carbonate is prepared from an aliphatic diol with 2-8 carbon atoms, and optionally, the structure of the cyclic carbonate is shown in formula (I) and / or formula (II):

[0009]

[0010] wherein R1, R2, R3, R4 are hydrogen atoms or aliphatic hydrocarbon groups with ≤6 carbon atoms, and the sum of carbon atoms of R1, R2, R3, R4 is ≤6, R5 is an aliphatic hydrocarbon group with ≤6 carbon atoms, R6, R7, R8, R9 are hydrogen atoms or aliphatic hydrocarbon groups with ≤5 carbon atoms, and the sum of carbon atoms of R5, R6, R7, R8, R9 is ≤6.

[0011] The hard alloy forming agent provided by the embodiments of the present application adopts the aliphatic cyclic carbonate described above, and the decomposition temperature of the hard alloy forming agent matches the sintering temperature of the hard alloy, so that the sintering process can be well connected with the debinding process. In addition, the aliphatic cyclic carbonate can dissolve the carbon deposition generated by the components in the hard alloy forming agent at high temperature in the production process of the hard alloy, thereby further reducing the carbon residual amount in the hard alloy.

[0012] In combination with the possible embodiments described above, one branch of the aliphatic chain carbonate is prepared from an aliphatic monohydric alcohol with 1-8 carbon atoms, and the other branch is prepared from an aliphatic monohydric alcohol with 2-8 carbon atoms, and optionally, the structure of the aliphatic chain carbonate is shown in formula (III):

[0013]

[0014] wherein R 10 and R 11 are aliphatic hydrocarbon groups with ≤8 carbon atoms, and the sum of carbon atoms of R 10 and R 11 is between 3 and 16.

[0015] The hard alloy forming agent provided by the embodiments of the present application adopts the aliphatic chain carbonate described above, and the hard alloy forming agent has better fluidity, which can make the hard alloy powder better fill and distribute in the mold, reduce the pressing pressure, improve the forming efficiency, and is especially suitable for preparing hard alloy products with complex shapes, and can obtain a blank body with a smooth surface and high dimensional accuracy.

[0016] In combination with the above possible embodiments, the aliphatic chain carbonate is an aliphatic chain ether alcohol carbonate, one branch of the aliphatic chain ether alcohol carbonate is prepared from an aliphatic ether alcohol containing 1 hydroxyl group, 1-4 ether bonds, ether bond and end-capped ether bond connected hydrocarbon groups with carbon atom number of 1-5, and the other branch is prepared from an aliphatic ether alcohol containing 1 hydroxyl group, 1-4 ether bonds, ether bond and end-capped ether bond connected hydrocarbon groups with carbon atom number of 1-5 or an aliphatic monohydric alcohol with carbon atom number of 1-8, and optionally, the structure of the aliphatic chain ether alcohol carbonate is shown in formula (IV) and / or formula (V):

[0017]

[0018] wherein, R 12 , R 13 , R 14 , R 15 is an aliphatic hydrocarbon group with carbon atom number ≤5, and m, n are integers of 1-4.

[0019] The hard alloy forming agent provided by the embodiments of the present application adopts the above aliphatic chain ether alcohol carbonate, and the hard alloy forming agent contains more oxygen elements. Oxygen atoms can form coordination bonds or hydrogen bonds with metal ions or other active sites on the surface of the hard alloy powder, thereby enhancing the bonding force between the forming agent and the powder particles, making the green body less likely to break during pressing and handling, and helping to improve the strength and quality of the green body. Meanwhile, the presence of oxygen elements can increase the polarity of the chain ether alcohol carbonate molecules, making them have better fluidity at a certain temperature and pressure, and better filling the corners of the mold, so that the hard alloy powder is more evenly distributed in the mold, which is conducive to improving the forming efficiency and the density uniformity of the green body. Moreover, a higher oxygen content helps the hard alloy forming agent to be removed in the form of CO2 during the hard alloy forming process.

[0020] In combination with the above possible embodiments, the aliphatic cyclic carbonate is modified from a rubber-based hard alloy forming agent and / or a polyethylene glycol-based hard alloy forming agent; and / or, the aliphatic chain carbonate is modified from a rubber-based hard alloy forming agent and / or a polyethylene glycol-based hard alloy forming agent, and optionally, the aliphatic chain carbonate is an aliphatic chain ether alcohol carbonate, which is modified from a rubber-based hard alloy forming agent and / or a polyethylene glycol-based hard alloy forming agent.

[0021] In combination with the above possible embodiments, the carbonate component includes an aliphatic cyclic carbonate and an aliphatic chain ether alcohol carbonate, and the mass ratio of the aliphatic chain ether alcohol carbonate to the aliphatic cyclic carbonate is ≥1. Under this mass ratio, the aliphatic chain ether alcohol carbonate and the aliphatic cyclic carbonate synergistically act, on the one hand, the aliphatic cyclic carbonate reduces the carbon deposition, and on the other hand, the aliphatic chain ether alcohol carbonate improves the oxidative removal of carbon deposition, and the carbon residue in the hard alloy is lower.

[0022] In combination with the possible embodiments described above, the fatty hydrocarbon component is one or more of fatty hydrocarbon compounds with carbon atom number 8-30. Alternatively, the fatty hydrocarbon component is one or more of fatty hydrocarbon compounds with carbon atom number 10-15, and further alternatively, the fatty hydrocarbon component is one of fatty hydrocarbon compounds with carbon atom number 10-15.

[0023] In combination with the possible embodiments described above, the fatty hydrocarbon component is a mixture of aliphatic alkanes.

[0024] In combination with the possible embodiments described above, the amount of the cemented carbide forming agent is 3%-6% of the mass of the cemented carbide powder.

[0025] In the embodiments of the present application, the amount of the cemented carbide forming agent is 5.5%-6% of the mass of the cemented carbide powder. In the debinding process of the preparation of the cemented carbide, the debinding efficiency of the cemented carbide forming agent can be improved, and the residual carbon due to incomplete debinding can be reduced. At the same time, the steam pressure generated in the volatilization process of the cemented carbide forming agent is relatively moderate, which ensures that the green body still maintains good structural integrity after debinding, and provides protection for the subsequent sintering and the performance of the final product.

[0026] In combination with the possible embodiments described above, the cemented carbide forming agent satisfies at least one of the following: (1) the viscosity of the cemented carbide forming agent at 25℃ is 1cp-35cp; (2) the surface tension of the cemented carbide forming agent is 20mN / m-40mN / m; (3) the friction coefficient of the cemented carbide forming agent is 0.05-0.15.

[0027] In a second aspect, the embodiments of the present application provide a preparation method of a cemented carbide forming agent. The fatty hydrocarbon component and the carbonate component are mixed uniformly at a mass ratio of 1:1-19:1 to obtain the cemented carbide forming agent, wherein the carbonate component is one or more of aliphatic cyclic carbonates, aliphatic chain carbonates, and aliphatic chain ether alcohol carbonates.

[0028] In a third aspect, the embodiments of the present application provide a cemented carbide prepared by the cemented carbide forming agent of the first aspect and / or prepared by the preparation method of the second aspect.

[0029] The cemented carbide provided by the embodiments of the present application has the advantages of less structural defects, less prone to cracks, and high strength of the blank. DETAILED DESCRIPTION

[0030] The features and exemplary embodiments of the various aspects of the present application will be described in detail below with reference to the figures. To make the present application more clear and more comprehensive, the present application will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are intended to explain the present application, but not to limit the present application. The present application can be implemented without some of the specific details described below. The following description of the embodiments is merely provided to give a better understanding of the present application by showing examples of the present application.

[0031] For simplicity, only some numerical ranges are explicitly disclosed herein. However, any lower limit can be combined with any upper limit to form a range not explicitly recited; and any lower limit can be combined with any other lower limit to form a range not explicitly recited, as can any upper limit with any other upper limit to form a range not explicitly recited. Furthermore, although a range of endpoints is specified, each point or individual number within that range is also included. Thus, each point or individual number can serve as its own lower limit or upper limit to form a range not explicitly recited.

[0032] The above summary of the application does not necessarily describe all embodiments or all implementations of the application. The following description more particularly exemplifies the embodiments and implementations. In the description, reference has been made to a number of embodiments of the application and specific arrangements thereof. Each of these embodiments has been described only as an example of the application, but there are alternate ways of implementing the application. The following description is, therefore, not to be taken in a limiting sense. Throughout the description, guidance is provided by a number of examples, which can be used in various combinations. In each instance, the recited list is representative only and should not be construed as exhaustive. Furthermore, the terms "first", "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Thus, features qualified by "first", "second" can explicitly or implicitly include at least one such feature. In the description of the application, "a plurality" means at least two, for example two, three, etc., unless expressly specified otherwise.

[0033] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict.

[0034] In addition, the term "and / or" in this document is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this document generally represents an "or" relationship between the front and rear associated objects.

[0035] It should be understood that, in the embodiments of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that the determination of B according to A does not mean that B is determined only according to A, but B can also be determined according to A and / or other information.

[0036] Cemented carbide has excellent properties of high hardness and high toughness, and has become one of the most widely used products in the world of powder metallurgy products. With the continuous improvement of automation, in order to meet the efficiency of mechanical cutting and processing, high-end processing industry not only puts forward higher requirements for the comprehensive performance of cemented carbide tools, but also brings more difficulties to the molding of complex shaped products. Compared with traditional die molding, injection molding, extrusion molding and 3D printing technology are suitable for complex molding, and high-performance cemented carbide molding agent matching with them is the key technology of molding process.

[0037] Cemented carbide molding agent is an auxiliary raw material in the production link of cemented carbide powder metallurgy, which plays a role in improving the forming performance of powder, can keep powder infiltration, improve green strength, reduce friction, promote particle rearrangement and increase powder plasticity.

[0038] The widely used cemented carbide molding agents at present include rubber, paraffin and polyethylene glycol. The rubber type cemented carbide molding agent has large molecular weight, wide fraction, high carbon residue and difficulty in precise carbon control. The paraffin type cemented carbide molding agent can be completely volatilized at high temperature, is easy to remove, has no residue, and reduces the difficulty of carbon control, but its viscosity is low, the strength of the compact is low, the edges and corners are easy to fall off, the elastic aftereffect is large, cracks are easy to appear at the stress concentration parts, and it is difficult to process complex shaped products. The residual carbon of the polyethylene glycol type cemented carbide molding agent is also less, but it is seriously hygroscopic, the molding pressure increases after hygroscopic, and it is more difficult to complex molding.

[0039] In view of the above technical problems, the embodiments of the present application provide a cemented carbide molding agent, a preparation method and application thereof. The cemented carbide molding agent of the present application is easy to sinter and remove, has low carbon residue, and effectively reduces the structural defects of cemented carbide.

[0040] The cemented carbide molding agent provided by the present application is introduced as follows.

[0041] In a first aspect, a cemented carbide molding agent comprises a fatty hydrocarbon component and a carbonate component, wherein the mass ratio of the fatty hydrocarbon component and the carbonate component is 1:1 to 19:1, and the carbonate component comprises an aliphatic cyclic carbonate and / or an aliphatic chain carbonate.

[0042] For example, the mass ratio of the aliphatic hydrocarbon component and the carbonate component can be 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, or a range consisting of any of the above values.

[0043] The hard alloy forming agent provided by the embodiments of the present application has good wettability and formability with hard alloy powder, and the hard alloy forming agent of the present application is easy to sinter and remove, has low carbon residue, and has non-toxic and environmentally friendly sintering gas, and has excellent comprehensive performance.

[0044] In addition, when the mass ratio of the aliphatic hydrocarbon component and the carbonate component is 1:1 to 19:1, on the one hand, the hard alloy forming agent provided by the embodiments of the present application can be better adsorbed on the surface of the hard alloy powder particles, so that the bonding force between the powders is enhanced, which helps to form a stable green body in the pressing process and reduces the damage of the green body. On the other hand, when the hard alloy forming agent provided by the embodiments of the present application is mixed with the hard alloy powder, the powder can flow and fill the mold more easily, thereby improving the efficiency and precision of the forming, and is especially suitable for preparing hard alloy products with complex shapes.

[0045] In some embodiments, the aliphatic cyclic carbonate is prepared from an aliphatic diol with a carbon atom number of 2 to 8, for example, the carbon atom number of the aliphatic diol can be 2, 3, 4, 5, 6, 7, 8. Optionally, the structure of the cyclic carbonate is shown in formula (I) and / or formula (II):

[0046]

[0047] wherein R1, R2, R3, R4 are hydrogen atoms or aliphatic hydrocarbon groups with a carbon atom number ≤6, for example, R1, R2, R3, R4 can all be methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, vinyl, propenyl, etc., and the sum of the carbon atom numbers of R1, R2, R3, R4 is ≤6, for example, the sum of the carbon atom numbers of R1, R2, R3, R4 can be 3, 4, 5, 6; R5 is an aliphatic hydrocarbon group with a carbon atom number ≤6, for example, the carbon atom number of R5 can be 2, 3, 4, 5, 6, R6, R7, R8, R9 are hydrogen atoms or aliphatic hydrocarbon groups with a carbon atom number ≤5, for example, R5, R6, R7, R8, R9 can all be methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, vinyl, propenyl, etc., and the sum of the carbon atom numbers of R5, R6, R7, R8, R9 is ≤6, for example, the sum of the carbon atom numbers of R5, R6, R7, R8, R9 can be 3, 4, 5, 6.

[0048] In the embodiments of the present application, the decomposition temperature of the hard alloy forming agent adopting the above-mentioned aliphatic cyclic carbonate matches the sintering temperature of the hard alloy, and the sintering process can be well connected with the debinding process. In addition, the aliphatic cyclic carbonate can dissolve the carbon deposited at high temperature during the production of the hard alloy and the components in the hard alloy forming agent, thereby further reducing the carbon residue in the hard alloy.

[0049] In some embodiments, one branch of the aliphatic chain carbonate is prepared from an aliphatic monohydric alcohol with carbon atom number of 1-8, for example, the carbon atom number of the aliphatic monohydric alcohol can be 1, 2, 3, 4, 5, 6, 7, 8; the other branch is prepared from an aliphatic monohydric alcohol with carbon atom number of 2-8, for example, the carbon atom number of the aliphatic monohydric alcohol can be 2, 3, 4, 5, 6, 7, 8, and optionally, the structure of the aliphatic chain carbonate is shown in formula (III):

[0050]

[0051] wherein R10 and R11 are both aliphatic hydrocarbon groups with carbon atom number ≤8, and the sum of the carbon atom numbers of R10 and R11 is between 3-16.

[0052] In the embodiments of the present application, the hard alloy forming agent adopting the above-mentioned aliphatic chain carbonate has better fluidity, which can make the hard alloy powder better fill and distribute in the mold, reduce the pressing pressure, improve the forming efficiency, and is especially suitable for preparing hard alloy products with complex shape, and can obtain a green body with smooth surface and high dimensional accuracy.

[0053] In some embodiments, the aliphatic chain carbonate is an aliphatic chain ether alcohol carbonate, one branch of which is prepared from an aliphatic ether alcohol containing 1 hydroxyl group, 1-4 ether bonds, ether bond and end-capped ether bond connecting hydrocarbon groups with carbon atom number of 1-5, for example, the number of ether bonds of the aliphatic ether alcohol can be 1, 2, 3, 4, and the carbon atom number of the end-capped ether bond can be 1, 2, 3, 4, 5; the other branch is prepared from an aliphatic ether alcohol containing 1 hydroxyl group, 1-4 ether bonds, ether bond and end-capped ether bond connecting hydrocarbon groups with carbon atom number of 1-5, or an aliphatic monohydric alcohol with carbon atom number of 1-8, and optionally, the structure of the aliphatic chain ether alcohol carbonate is shown in formula (IV) and / or formula (V):

[0054]

[0055]

[0056] wherein R12, R13, R14, R15 are aliphatic hydrocarbon groups with carbon atom number ≤5, and m, n are integers of 1-4.

[0057] In the embodiments of the present application, the above-mentioned aliphatic chain ether alcohol carbonate, the oxygen element contained in the hard alloy forming agent is more, and the oxygen atom can form coordination bond or hydrogen bond and other interactions with the metal ions or other active sites on the surface of the hard alloy powder, thereby enhancing the adhesion between the forming agent and the powder particles, making the green body more difficult to break during pressing and handling, and helping to improve the strength and quality of the green body. At the same time, the presence of oxygen elements can increase the polarity of the chain ether alcohol carbonate molecules, making them have better fluidity at a certain temperature and pressure, and better filling the corners of the mold, so that the hard alloy powder is more evenly distributed in the mold, which is conducive to improving the forming efficiency and the density uniformity of the green body. And, the higher oxygen content helps the hard alloy forming agent to be removed in the form of CO2 during the hard alloy forming process.

[0058] In some embodiments, the aliphatic cyclic carbonate is modified from a rubber-based hard alloy forming agent and / or a polyethylene glycol-based hard alloy forming agent; and / or, the aliphatic chain carbonate is modified from a rubber-based hard alloy forming agent and / or a polyethylene glycol-based hard alloy forming agent, and optionally, the aliphatic chain carbonate is an aliphatic chain ether alcohol carbonate, which is modified from a rubber-based hard alloy forming agent and / or a polyethylene glycol-based hard alloy forming agent.

[0059] In some embodiments, the carbonate component includes an aliphatic cyclic carbonate and an aliphatic chain ether alcohol carbonate, and the mass ratio of the aliphatic chain ether alcohol carbonate to the aliphatic cyclic carbonate is ≥1, for example, the mass ratio of the aliphatic chain ether alcohol carbonate to the aliphatic cyclic carbonate can be 1, 1.2, 1.5, 1.8, 2, 3, 4, or a range composed of any of the above values. At this mass ratio, the aliphatic chain ether alcohol carbonate and the aliphatic cyclic carbonate synergistically act, on the one hand, the aliphatic cyclic carbonate reduces carbon deposition, and on the other hand, the aliphatic chain ether alcohol carbonate improves the oxidative removal of carbon deposition, and the carbon residue in the hard alloy is lower.

[0060] In some embodiments, the aliphatic hydrocarbon component is one or more of aliphatic hydrocarbon compounds with carbon atom number 8-30, for example, the carbon atom number of the aliphatic hydrocarbon compounds can be 8, 9, 10, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30. Optionally, the aliphatic hydrocarbon component is one or more of aliphatic hydrocarbon compounds with carbon atom number 10-15, and further optionally, the aliphatic hydrocarbon component is one of aliphatic hydrocarbon compounds with carbon atom number 10-15. By using one of aliphatic hydrocarbon compounds with carbon atom number 10-15 as the aliphatic hydrocarbon component, the aliphatic hydrocarbon compounds with this carbon atom number have better physical properties and volatility, which helps to control the quality of the hard alloy forming agent and the removal of the hard alloy forming agent in the subsequent hard alloy preparation process.

[0061] In some embodiments, the aliphatic hydrocarbon component is an aliphatic alkane mixture, for example, the aliphatic alkane mixture includes aliphatic alkanes of different carbon chain lengths, from shorter carbon chains, such as propane containing 3 carbon atoms, to medium length carbon chains, such as octane containing 8 carbon atoms, or even longer carbon chain alkanes. The aliphatic alkanes can be derived from the fractional distillation of petroleum, and fractions containing different proportions of aliphatic alkanes can be obtained at different fractional distillation stages; or can be prepared by specific organic synthesis reactions.

[0062] In some embodiments, the amount of the cementing agent for cemented carbide is 3% to 6% of the mass of the cemented carbide powder, for example, it can be 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, or a range consisting of any of the above values.

[0063] In the embodiments of the present application, the amount of the cementing agent for cemented carbide is 5.5% to 6% of the mass of the cemented carbide powder. In the debinding process of the cemented carbide, the debinding efficiency of the cementing agent for cemented carbide can be improved, and the residual carbon caused by incomplete debinding can be reduced. At the same time, the steam pressure generated during the volatilization of the cementing agent for cemented carbide is relatively moderate, which ensures that the green body still maintains good structural integrity after debinding, and provides protection for the subsequent sintering and the performance of the final product.

[0064] In some embodiments, the cementing agent for cemented carbide satisfies at least one of the following: (1) the viscosity of the cementing agent for cemented carbide at 25°C is 1 cp to 35 cp, for example, it can be 1 cp, 5 cp, 10 cp, 15 cp, 20 cp, 25 cp, 30 cp, 35 cp, or a range consisting of any of the above values; (2) the surface tension of the cementing agent for cemented carbide is 20 mN / m to 40 mN / m, for example, it can be 20 mN / m, 21 mN / m, 22 mN / m, 23 mN / m, 24 mN / m, 25 mN / m, 26 mN / m, 27 mN / m, 28 mN / m, 29 mN / m, 30 mN / m, 31 mN / m, 32 mN / m, 33 mN / m, 34 mN / m, 35 mN / m, 36 mN / m, 37 mN / m, 38 mN / m, 39 mN / m, 40 mN / m, or a range consisting of any of the above values; (3) the friction coefficient of the cementing agent for cemented carbide is 0.05 to 0.15, for example, it can be 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, or a range consisting of any of the above values.

[0065] In a second aspect, the embodiments of the present application provide a preparation method of a cemented carbide forming agent, which comprises mixing a fatty hydrocarbon component and a carbonate component in a mass ratio of 1:1 to 19:1 to obtain the cemented carbide forming agent, wherein the carbonate component is one or more of aliphatic cyclic carbonates, aliphatic chain carbonates, and aliphatic chain ether alcohol carbonates.

[0066] In a third aspect, the embodiments of the present application provide a cemented carbide prepared by the cemented carbide forming agent of the first aspect and / or the cemented carbide forming agent prepared by the preparation method of the second aspect. Optionally, the cemented carbide can be an extrusion-formed solid rod or a rod with internal cooling holes.

[0067] The cemented carbide provided by the embodiments of the present application has the advantages of less structural defects, less prone to cracks, and high green strength.

[0068] The following examples are provided to more specifically describe the present disclosure, which are only illustrative.

[0069] Since various modifications and changes can be made within the scope of the present disclosure, they should be considered obvious to those skilled in the art. Unless otherwise stated, all parts, percentages and ratios reported in the following examples are based on mass, and all raw materials used in the examples are commercially available or prepared according to conventional methods and can be used directly without further treatment, and the instruments used in the examples are commercially available.

[0070] The cemented carbide powder used in the present embodiment includes tungsten carbide powder and binder metal cobalt.

[0071] Example 1

[0072] A cemented carbide forming agent comprises a fatty hydrocarbon component and a carbonate component, and the mass ratio of the fatty hydrocarbon component to the carbonate component is 5:1. The cemented carbide forming agent is obtained by mixing 1000 g of an alkane mixture with carbon atoms of 8-18 and 200 g of an aliphatic chain carbonate with carbon atoms of 4-8. The viscosity of the cemented carbide forming agent of the present embodiment at 25°C is 1.83 cp, the surface tension is 25.85 mN / m, and the friction coefficient is 0.13.

[0073] A cemented carbide rod is formed by extrusion, and the raw material comprises 6 wt% of the above-mentioned cemented carbide forming agent. The extrusion pressure is 100 MPa-200 MPa, the extrusion is smooth without cracks, there is no cobalt pool after sintering, the metallography is normal, and the carbon residual amount is 0.5%.

[0074] Example 2

[0075] A cement for cementing a cemented carbide, comprising a fatty hydrocarbon component and a carbonate component, the mass ratio of the fatty hydrocarbon component to the carbonate component being 2.5:1, wherein the cement for cementing a cemented carbide is obtained by mixing 1000 g of an alkane mixture having a carbon number of 8-16, 250 g of a fatty chain carbonate having a carbon number of 3-6, and 150 g of a mixture of methyl(methoxyethyl) carbonate and methyl(ethoxyethyl) carbonate. The cement for cementing a cemented carbide of the present embodiment has a viscosity of 1.77 cp, a surface tension of 26.1 mN / m, and a friction coefficient of 0.107 at 25°C.

[0076] A cemented carbide rod is obtained by extrusion molding, the raw material including 6 wt% of the cement for cementing a cemented carbide described above, the extrusion pressure being 100 MPa-200 MPa, the extrusion being smooth without cracks, there being no cobalt pool after sintering, the metallography being normal, and the carbon residual amount being 0.37%.

[0077] Example 3

[0078] A cement for cementing a cemented carbide, comprising a fatty hydrocarbon component and a carbonate component, the mass ratio of the fatty hydrocarbon component to the carbonate component being 3.33:1, wherein the cement for cementing a cemented carbide is obtained by mixing 1000 g of an alkane mixture having a carbon number of 8-16, 100 g of a mixture of fatty cyclic carbonates having a carbon number of 3-6, and 100 g of a mixture of methyl(methoxyethyl) carbonate and methyl(ethoxyethyl) carbonate. The cement for cementing a cemented carbide of the present embodiment has a viscosity of 1.27 cp, a surface tension of 26.34 mN / m, and a friction coefficient of 0.083 at 25°C.

[0079] A cemented carbide rod is obtained by extrusion molding, the raw material including 5.5 wt% of the cement for cementing a cemented carbide described above, the extrusion pressure being 100 MPa-200 MPa, the extrusion being smooth without cracks, there being no cobalt pool after sintering, the metallography being normal, and the carbon residual amount being 0.26%.

[0080] Example 4

[0081] A cement for cementing a cemented carbide, comprising a fatty hydrocarbon component and a carbonate component, the mass ratio of the fatty hydrocarbon component to the carbonate component being 9:1, wherein the cement for cementing a cemented carbide is obtained by mixing 900 g of a fatty hydrocarbon having a carbon number of 15, 50 g of a mixture of fatty cyclic carbonates having a carbon number of 3-6, and 50 g of a mixture of methyl(methoxyethyl) carbonate and methyl(ethoxyethyl) carbonate. The cement for cementing a cemented carbide of the present embodiment has a viscosity of 2.36 cp, a surface tension of 28.15 mN / m, and a friction coefficient of 0.082 at 25°C.

[0082] A cemented carbide rod is formed by extrusion molding, the raw material including 5.5 wt% of the above cemented carbide molding agent, the extrusion pressure being 100 MPa to 200 MPa, the extrusion being smooth without cracks, no cobalt pool after sintering, no abnormal metallography, and the carbon residual amount being 0.17%.

[0083] Comparative Example 1

[0084] A cemented carbide molding agent includes a fatty hydrocarbon component and a carbonate component, the mass ratio of the fatty hydrocarbon component to the carbonate component being 1:2, wherein the cemented carbide molding agent is obtained by mixing 400 g of an alkane mixture having a carbon atom number of 8 to 18 and 800 g of a fatty chain carbonate having a carbon atom number of 4 to 8 from the fatty hydrocarbon component. The cemented carbide molding agent of this comparative example has a viscosity of 1.58 cp, a surface tension of 28.22 mN / m, and a friction coefficient of 0.12 at 25°C.

[0085] A cemented carbide rod is formed by extrusion molding, the raw material including 5.5 wt% of the above cemented carbide molding agent, the extrusion pressure being 100 MPa to 200 MPa, and the carbon residual amount being 0.89%.

[0086] Comparative Example 2

[0087] A cemented carbide molding agent includes a fatty hydrocarbon component and a carbonate component, the mass ratio of the fatty hydrocarbon component to the carbonate component being 24:1, wherein the cemented carbide molding agent is obtained by mixing 1200 g of an alkane mixture having a carbon atom number of 8 to 18 and 50 g of a fatty chain carbonate having a carbon atom number of 4 to 8 from the fatty hydrocarbon component. The cemented carbide molding agent of this comparative example has a viscosity of 2.12 cp, a surface tension of 24.86 mN / m, and a friction coefficient of 0.101 at 25°C.

[0088] A cemented carbide rod is formed by extrusion molding, the raw material including 5.5 wt% of the above cemented carbide molding agent, the extrusion pressure being 100 MPa to 200 MPa, and the carbon residual amount being 0.96%.

[0089] Comparative Example 3

[0090] An existing cemented carbide molding agent (an alkane mixture having a carbon atom number of 8 to 18) is used. A cemented carbide rod is formed by extrusion molding, the raw material including 5.5 wt% of the above cemented carbide molding agent, the extrusion pressure being 100 MPa to 200 MPa, and the carbon residual amount being 1.13%.

[0091] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A cemented carbide forming agent, characterized in that, It includes an aliphatic hydrocarbon component and a carbonate component, wherein the mass ratio of the aliphatic hydrocarbon component to the carbonate component is 1:1 to 19:1, the aliphatic hydrocarbon component is one or more of aliphatic hydrocarbon compounds with 8 to 30 carbon atoms, and the carbonate component includes aliphatic cyclic carbonates and / or aliphatic chain carbonates. The aliphatic cyclic carbonates are as shown in formula (I) and / or formula (II): Formula (I) Equation (II) Wherein, R1, R2, R3, and R4 are aliphatic hydrocarbon groups with ≤6 hydrogen atoms or carbon atoms, and the sum of the carbon atoms of R1, R2, R3, and R4 is ≤6; R5 is an aliphatic hydrocarbon group with ≤6 carbon atoms; R6, R7, R8, and R9 are aliphatic hydrocarbon groups with ≤5 hydrogen atoms or carbon atoms, and the sum of the carbon atoms of R5, R6, R7, R8, and R9 is ≤6; the structure of the aliphatic chain carbonate is shown in formula (III) and / or formula (IV): Equation (III) Among them, R 10 and R 11 All are aliphatic hydrocarbon groups with ≤8 carbon atoms, and R 10 and R 11 The sum of the number of carbon atoms is between 3 and 16; Equation (Ⅳ) Among them, R 12 R 13 R 14 R 15 It is an aliphatic hydrocarbon group with ≤5 carbon atoms, where m and n are integers from 1 to 4.

2. The cemented carbide forming agent according to claim 1, characterized in that, The carbonate component includes aliphatic cyclic carbonates and aliphatic chain ether alcohol carbonates, wherein the mass ratio of the aliphatic chain ether alcohol carbonates to the aliphatic cyclic carbonates is ≥1.

3. The cemented carbide forming agent according to claim 1, characterized in that, The aliphatic hydrocarbon component is one or more of aliphatic hydrocarbon compounds with 10 to 15 carbon atoms.

4. The cemented carbide forming agent according to claim 3, characterized in that, The aliphatic hydrocarbon component is one of the aliphatic hydrocarbon compounds with 10 to 15 carbon atoms.

5. The cemented carbide forming agent according to claim 1, characterized in that, The aliphatic hydrocarbon component is a mixture of aliphatic alkanes.

6. The cemented carbide forming agent according to any one of claims 1-5, characterized in that, The cemented carbide forming agent satisfies at least one of the following: (1) The viscosity of the cemented carbide forming agent at 25°C is 1cp~35cp; (2) The surface tension of the cemented carbide forming agent is 20mN / m~40mN / m; (3) The friction coefficient of the cemented carbide forming agent is 0.05~0.

15.

7. A method for preparing a cemented carbide forming agent, characterized in that, The cemented carbide forming agent is obtained by uniformly mixing aliphatic hydrocarbon components and carbonate components at a mass ratio of 1:1 to 19:1, wherein the carbonate component includes aliphatic cyclic carbonates and / or aliphatic chain carbonates.

8. A cemented carbide, characterized in that, The cemented carbide forming agent prepared by any one of claims 1-6 and / or prepared by the preparation method of claim 7 is prepared.

9. The cemented carbide according to claim 8, characterized in that, When preparing the cemented carbide, the amount of cemented carbide forming agent used is 3% to 6% of the mass of the cemented carbide powder.

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