CN111057929A - Microcrystal GW10u hard alloy and preparation method thereof - Google Patents
Microcrystal GW10u hard alloy and preparation method thereof Download PDFInfo
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- CN111057929A CN111057929A CN201911329048.6A CN201911329048A CN111057929A CN 111057929 A CN111057929 A CN 111057929A CN 201911329048 A CN201911329048 A CN 201911329048A CN 111057929 A CN111057929 A CN 111057929A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder
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Abstract
The invention discloses a microcrystal GW10u hard alloy which comprises the following raw materials in parts by mass: 89-93 parts of tungsten carbide powder, 5-7 parts of cobalt powder and 2-4 parts of catalyst YH. The invention takes superfine tungsten carbide powder and cobalt powder as main raw materials, adopts the addition of trace crystal grain inhibitor Y and metal activator H and the combination thereof, and mixes under a unique wet grinding RD oxygen-resistant medium, thereby effectively solving the defects of unstable performance caused by uneven tissue, large crystal grains and unstable chemical components of the mixture in the preparation process of the superfine hard alloy material, and being capable of preparing the GW10u hard alloy mark with stable tissue structure in microcosmic and high strength and hardness in macroscopical. The grade can be simultaneously suitable for processing K, N, S, H hard cutting metals, has wide cutting range and completely covers the range specified by the existing national standard GB/T18376.1. In addition, the invention has the advantages of mature and simple process, good product stability and excellent performance.
Description
Technical Field
The invention relates to the technical field of hard alloy, in particular to microcrystalline GW10u hard alloy and a preparation method thereof.
Background
The hard alloy is an excellent tool material, and the properties of the hard alloy tend to the characteristics of high strength, high hardness and high temperature resistance more and more, so that the hard alloy is unique in the industrial tool industry and can replace the traditional high-speed steel tool material in a large amount and quickly.
Most cemented carbides are used as materials for cutting tools, and their effectiveness depends mainly on the properties of the cemented carbide. The traditional hard alloy has the following performance characteristics: the strength is increased, the hardness is reduced, the toughness is good, the wear resistance is poor, and only partial performances of the cutter can be met.
Disclosure of Invention
The invention aims to provide a microcrystalline GW10u hard alloy with high strength, high hardness, and good toughness and wear resistance, and a preparation method thereof.
The invention aims to provide a microcrystal GW10u hard alloy which comprises the following raw materials in parts by mass: 89-93 parts of tungsten carbide powder, 5-7 parts of cobalt powder and 2-4 parts of catalyst YH.
Further, the catalyst YH comprises an inhibitor Y and an activator H, wherein the mass percentage of the inhibitor Y to the activator H is 40-70: 30-60.
Further, the inhibitor Y includes TaC, VC and Cr2C3, the mass composition ratio is: (0-5)/(2-4)/(1-3).
Further, the activator H includes Re powder.
Further, the particle size of the raw materials is 0.5-0.7 um.
The invention also provides a preparation method of the microcrystal GW10u hard alloy, which comprises the following steps:
(1) 89-93 parts by mass of tungsten carbide powder, 5-7 parts by mass of cobalt powder and 2-4 parts by mass of catalyst are taken, and the raw materials are fully mixed under an RD oxygen-blocking medium, wherein the RD oxygen-blocking medium is an anhydrous 120# gasoline solvent and an SD forming agent, the anhydrous 120# gasoline solvent accounts for 30-40% of the raw materials by mass, and the SD forming agent accounts for 20-30% of the raw materials by mass;
(2) ball-milling the mixed raw materials for 60-72 h to obtain slurry;
(3) standing and precipitating the slurry for 2.0-3.0 h, then separating and drying, recovering the RD oxygen-blocking medium after separation, and drying the particulate matters after separation;
(4) the particulate matter after the drying screens, and the particle size of screening is 60 ~ 80 meshes, then the sintering shaping, and the temperature of sintering is including the three stage that carries on in proper order: keeping the temperature of 400-530 ℃ for 60-80 min, keeping the temperature of 1200-1300 ℃ for 20-40 min, keeping the temperature of 1380-1450 ℃ for 60-80 min, and keeping the pressure of 4.5-5.5 MPa.
Further, the ball milling adopts a wet ball mill.
Further, the separation and drying adopts a Z-shaped stirring dryer.
The invention takes superfine tungsten carbide powder and cobalt powder as main raw materials, adopts the addition of trace crystal grain inhibitor Y and metal activator H and the combination thereof, and mixes under a unique wet grinding RD oxygen-resistant medium, thereby effectively solving the defects of unstable performance caused by uneven tissue, large crystal grains and unstable chemical components of the mixture in the preparation process of the superfine hard alloy material, and stably preparing the GW10u hard alloy mark with stable tissue structure on the micro, high strength and high hardness on the macro. The grade can be simultaneously suitable for processing K, N, S, H hard cutting metals, has wide cutting range and completely covers the range specified by the existing national standard GB/T18376.1. In addition, the method has the advantages of mature and simple process, good product stability, excellent performance and easy realization of industrial production.
Detailed Description
Example 1
The preparation method of the microcrystalline GW10u hard alloy provided in this embodiment includes the following steps:
(1) 93.0 parts by mass of tungsten carbide powder, 5.0 parts by mass of cobalt powder and 2.0 parts by mass of catalyst are taken, the particle size of the tungsten carbide powder is 0.63um, and the catalyst YH comprises 55:45 mass percent of inhibitor Y (TaC, VC and Cr2C 3; mass composition ratio: 2/3/2) and activator H (Re powder);
fully mixing the raw materials under an RD oxygen-blocking medium, wherein the RD oxygen-blocking medium comprises an anhydrous 120# gasoline solvent and an SD forming agent, the anhydrous 120# gasoline solvent accounts for 35% of the mass of the raw materials, and the SD forming agent accounts for 25% of the mass of the raw materials;
(2) putting the mixed raw materials into a wet ball mill for ball milling for 60.0h to obtain slurry;
(3) standing and precipitating the slurry for 2.5h, then loading the slurry into a Z-shaped stirring dryer for gasoline solvent recovery to dry and mix, recovering the separated RD oxygen-blocking medium, and drying the separated particles;
(4) the particle matter after the drying is screened, the particle size of screening is 60 meshes, then the sintering shaping, the temperature of sintering includes three stages that carry out in proper order: keeping the temperature at 500 deg.C for 60min, at 1200 deg.C for 30min, at 1400 deg.C for 70min, and filling Ar for the last 50min of sintering2Keeping the pressure at 5.5 MPa; cooling to obtain GW10u microcrystalline hard alloy.
Example 2
The preparation method of the microcrystalline GW10u hard alloy provided in this embodiment includes the following steps:
(1) 91.0 parts by mass of tungsten carbide powder, 6.0 parts by mass of cobalt powder and 3.0 parts by mass of catalyst YH, wherein the particle size of the tungsten carbide powder is 0.63um, and the catalyst YH comprises 60:40 mass percent of inhibitor Y (TaC, VC and Cr2C3, the mass composition ratio is 0/3/3) and activator H (Re powder);
fully mixing the raw materials under an RD oxygen-blocking medium, wherein the RD oxygen-blocking medium comprises an anhydrous 120# gasoline solvent and an SD forming agent, the anhydrous 120# gasoline solvent accounts for 40% of the mass of the raw materials, and the SD forming agent accounts for 30% of the mass of the raw materials;
(2) putting the mixed raw materials into a wet ball mill for ball milling for 72h to obtain slurry;
(3) standing and precipitating the slurry for 3h, then loading the slurry into a Z-shaped stirring dryer for gasoline solvent recovery to dry and mix, recovering the separated RD oxygen-resisting medium, and drying the separated particles;
(4) the particle matter after the drying is screened, the particle size of screening is 80 meshes, then the sintering shaping, the temperature of sintering includes three stages that carry out in proper order: keeping the temperature at 400 deg.C for 80min, at 1300 deg.C for 20min, at 1420 deg.C for 60min, and filling Ar for the last 50min of sintering2Keeping the pressure at 5.5 MPa; cooling to obtain GW10u microcrystalline hard alloy.
Example 3
The preparation method of the microcrystalline GW10u hard alloy provided in this embodiment includes the following steps:
(1) 89.0 parts by mass of tungsten carbide powder, 7.0 parts by mass of cobalt powder and 4.0 parts by mass of catalyst YH, wherein the particle sizes of the tungsten carbide powder and the cobalt powder are 0.55um, and the catalyst YH comprises an inhibitor Y (TaC, VC and Cr2C3, the mass composition ratio is 3/3/1) and an activator H (Re powder) which are 50:50 in percentage by mass;
fully mixing the raw materials under an RD oxygen-blocking medium, wherein the RD oxygen-blocking medium comprises an anhydrous 120# gasoline solvent and an SD forming agent, the anhydrous 120# gasoline solvent accounts for 30% of the mass of the raw materials, and the SD forming agent accounts for 20% of the mass of the raw materials;
(2) putting the mixed raw materials into a wet ball mill for ball milling for 72.0h to obtain slurry;
(3) standing and precipitating the slurry for 2.5h, then loading the slurry into a Z-shaped stirring dryer for gasoline solvent recovery to dry and mix, recovering the separated RD oxygen-blocking medium, and drying the separated particles;
(4) the particle matter after the drying is screened, the particle size of screening is 80 meshes, then the sintering shaping, the temperature of sintering includes three stages that carry out in proper order: keeping the temperature at 530 deg.C for 60min, at 1200 deg.C for 40min, at 1450 deg.C for 70min, and filling Ar for 50min after sintering2Keeping the pressure at 5.5 MPa; cooling to obtain GW10u microcrystalline hard alloy.
The strength value of the GW10u microcrystalline hard alloy prepared by the embodiments 1-3 reaches 3300MPa, and the hardness value HRA reaches 93.5 (HV)301900) combined strength and hardness properties [3300,1900)]And almost covers GB/T18376.1-2008 hard alloy part 1: provisions of cemented carbide grade for cutting tools: k01-40, [1800,92.3 ]]，N01-30，[1700,94.0]，S01-30，[1750,92.3]，H01-30，[1500,92.3]The range of (1).
Comparative example 1
In this example, substantially the same as in example 3, the amount of catalyst YH was reduced by changing the mass part of tungsten carbide powder to 92.0 parts, and the other steps were not changed to obtain a GW10u microcrystalline cemented carbide. As shown in Table 1, in comparison with the preparation of example 3, the grain size of tungsten carbide is significantly refined, and the strength and hardness are not as good as those of example 3.
Table 1: comparison of effects of YH addition under the same conditions in cemented carbide materials
Comparative example 2
In this example, substantially the same as example 3, the microcrystalline cemented carbide of GW10u was prepared by changing the RD oxygen-barrier medium into alcohol and paraffin wax, and the other steps were not changed. As shown in table 2, both texture and performance were not as good as those of example 3, compared to that prepared in example 3.
Table 2: comparison of RD (mechanical breakdown voltage) and traditional alcohol paraffin effects in wet grinding under the same condition in hard alloy material
Claims (9)
1. The microcrystal GW10u hard alloy is characterized by comprising the following raw materials in parts by mass: 89-93 parts of tungsten carbide powder, 5-7 parts of cobalt powder and 2-4 parts of catalyst YH.
2. Microcrystalline GW10u cemented carbide according to claim 1, characterized in that: the catalyst YH comprises an inhibitor Y and an activator H, wherein the mass ratio of the inhibitor Y to the activator H is 4-7: 3-6.
3. Microcrystalline GW10u cemented carbide according to claim 2, characterized in that: the inhibitor Y comprises TaC, VC and Cr2C3。
4. Microcrystalline GW10u cemented carbide according to claim 3, characterized in that: the mass ratio of the inhibitor Y to the inhibitor Y is TaC to VC to Cr2C3＝(0～5):(2～4):(1～3)。
5. Microcrystalline GW10u cemented carbide according to claim 2, characterized in that: the activator H comprises Re powder.
6. Microcrystalline GW10u cemented carbide according to any one of claims 1-5, characterised in that: the particle size of the raw materials is 0.5-0.7 um.
7. A preparation method of microcrystalline GW10u hard alloy is characterized by comprising the following steps:
(1) 89-93 parts by mass of tungsten carbide powder, 5-7 parts by mass of cobalt powder and 2-4 parts by mass of catalyst are taken, and the raw materials are fully mixed under an RD oxygen-blocking medium, wherein the RD oxygen-blocking medium is an anhydrous 120# gasoline solvent and an SD forming agent, the anhydrous 120# gasoline solvent accounts for 30-40% of the raw materials by mass, and the SD forming agent accounts for 20-30% of the raw materials by mass;
(2) ball-milling the mixed raw materials for 60-72 h to obtain slurry;
(3) standing and precipitating the slurry for 2.0-3.0 h, then separating and drying, recovering the RD oxygen-blocking medium after separation, and drying the particulate matters after separation;
(4) the particulate matter after the drying screens, and the particle size of screening is 60 ~ 80 meshes, then the sintering shaping, and the temperature of sintering is including the three stage that carries on in proper order: keeping the temperature of 400-530 ℃ for 60-80 min, keeping the temperature of 1200-1300 ℃ for 20-40 min, keeping the temperature of 1380-1450 ℃ for 60-80 min, and keeping the pressure of 4.5-5.5 MPa.
8. The method for preparing microcrystalline GW10u cemented carbide of claim 7, wherein: the ball milling adopts a tilting wet ball mill.
9. The method for preparing microcrystalline GW10u cemented carbide of claim 7, wherein: and a Z-shaped stirring dryer is adopted for wet grinding medium separation and slurry drying.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114367650A (en) * | 2021-12-23 | 2022-04-19 | 中钢集团邢台机械轧辊有限公司 | Preparation method of high-speed steel working roll for rolling single-rack thin strip |
| CN116924804A (en) * | 2023-09-18 | 2023-10-24 | 成都金钨硬质合金有限公司 | A bonding phase-free ultra-fine ultra-particle cemented carbide and its preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1480546A (en) * | 2003-07-22 | 2004-03-10 | 株洲硬质合金集团有限公司 | Method for preparing superfine hard alloy |
| US20050191482A1 (en) * | 2003-01-13 | 2005-09-01 | Liu Shaiw-Rong S. | High-performance hardmetal materials |
| CN109487143A (en) * | 2019-01-09 | 2019-03-19 | 成都金钨硬质合金有限公司 | A kind of crystallite GW30u hard alloy and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050191482A1 (en) * | 2003-01-13 | 2005-09-01 | Liu Shaiw-Rong S. | High-performance hardmetal materials |
| CN1480546A (en) * | 2003-07-22 | 2004-03-10 | 株洲硬质合金集团有限公司 | Method for preparing superfine hard alloy |
| CN109487143A (en) * | 2019-01-09 | 2019-03-19 | 成都金钨硬质合金有限公司 | A kind of crystallite GW30u hard alloy and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114367650A (en) * | 2021-12-23 | 2022-04-19 | 中钢集团邢台机械轧辊有限公司 | Preparation method of high-speed steel working roll for rolling single-rack thin strip |
| CN114367650B (en) * | 2021-12-23 | 2024-04-05 | 中钢集团邢台机械轧辊有限公司 | Preparation method of high-speed steel working roll for single-frame thin strip rolling |
| CN116924804A (en) * | 2023-09-18 | 2023-10-24 | 成都金钨硬质合金有限公司 | A bonding phase-free ultra-fine ultra-particle cemented carbide and its preparation method |
| CN116924804B (en) * | 2023-09-18 | 2023-11-21 | 成都金钨硬质合金有限公司 | Binding phase-free ultrafine ultra-fine grain hard alloy and preparation method thereof |
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