CN113088782A - Chromium-containing hard alloy material and preparation process thereof - Google Patents
Chromium-containing hard alloy material and preparation process thereof Download PDFInfo
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- CN113088782A CN113088782A CN202110375856.7A CN202110375856A CN113088782A CN 113088782 A CN113088782 A CN 113088782A CN 202110375856 A CN202110375856 A CN 202110375856A CN 113088782 A CN113088782 A CN 113088782A
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- 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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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
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- B22F9/00—Making metallic powder or suspensions thereof
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- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- C22C1/04—Making non-ferrous alloys by powder metallurgy
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- 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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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/041—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by mechanical alloying, e.g. blending, milling
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Abstract
The invention discloses a chromium-containing hard alloy material and a preparation process thereof, and the key points of the technical scheme are as follows: the method comprises the following steps: tungsten carbide powder, cobalt powder, nickel powder, chromium powder, and molybdenum powder; 1.0-3.0 wt% of nickel powder, 0.5-2.0 wt% of chromium powder, 0.1-0.5 wt% of molybdenum powder, 10-12 wt% of cobalt powder and 80-90 wt% of tungsten carbide powder; the chromium powder is added instead of the conventional chromium carbide powder, and part of the chromium carbide powder is reacted to generate chromium carbide, so that the dissolution, precipitation and growth of tungsten carbide grains in the alloy can be inhibited, and the tungsten carbide grains are refined; in addition, the solid solution alloy phase is formed with the binding metal cobalt, nickel and molybdenum, so that the electric corrosion resistance of the invention can be improved.
Description
Technical Field
The invention belongs to the technical field of hard alloy, and particularly relates to a chromium-containing hard alloy material and a preparation process thereof.
Background
Cemented carbide is a cermet material made of a hard compound of a refractory metal and a binder metal by a powder metallurgy process. The hard alloy has a series of excellent performances of high hardness, good wear resistance, high strength, heat resistance, corrosion resistance and the like, particularly high hardness and wear resistance, basically keeps unchanged even at the temperature of 500 ℃, and still has high hardness at the temperature of 1000 ℃. Cemented carbide is widely used as a tool material, such as turning tools, milling cutters, reamers, drill bits, boring cutters and the like, for cutting cast iron, nonferrous metals, plastics, chemical fibers, graphite, glass, stone and common steel, and also for cutting refractory steel, stainless steel, high manganese steel, tool steel and other materials which are difficult to process. At present, the machining means adopted by the hard alloy material mainly comprises electric machining and diamond grinding wheel grinding. In the existing hard alloy material, a quite serious electro-corrosion layer can be formed within a certain size range from the surface in the electro-machining process, so that the surface performance of a product is obviously reduced.
Disclosure of Invention
The invention aims to provide a chromium-containing hard alloy material and a preparation process thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a chromium-containing hard alloy material and a preparation process thereof comprise the following steps:
tungsten carbide powder, cobalt powder, nickel powder, chromium powder, and molybdenum powder;
the nickel powder content is 1.0-3.0 wt%, the chromium powder content is 0.5-2.0 wt%, the molybdenum powder content is 0.1-0.5 wt%, the cobalt powder content is 10-12 wt%, and the tungsten carbide powder content is 80-90 wt%.
Preferably, the tungsten carbide powder, the cobalt powder, the nickel powder, the chromium powder and the molybdenum powder are put into a stirrer according to the proportion for mixing and grinding, the rotation speed of the stirrer is 450r/min, and the grinding time is 35-55 min.
Preferably, the nickel powder, the chromium powder, the cobalt powder and the molybdenum powder form a solid solution binder phase when sintered, and the tungsten carbide powder is used for improving the hardness of the alloy material.
Preferably, the cobalt powder has an FSSS particle size of 1.0 micron, the nickel powder has an FSSS particle size of 2 microns, and the chromium powder has an FSSS particle size of 1.0 micron.
The invention also provides a preparation process of the chromium-containing hard alloy material, which comprises the following steps:
the method comprises the following steps: preparing materials: weighing the raw material powder according to a proportion, and then putting the raw material powder into a stirrer for fully mixing;
step two: wet grinding: putting the fully mixed raw materials in the step one into a wet grinder for wet grinding;
step three: and (3) granulation: injecting the wet-milled material into a spray drying tower for spray granulation, wherein the outlet temperature at the bottom of the tower is 90-110 ℃, the internal pressure of the drying tower is 1.2-1.9kPa, and the particle size of the prepared material particles is controlled to be 40-500 microns;
step four: pressing: designing and manufacturing a pressing die according to the size and the shape of a product and the powder compression ratio, and pressing the die to obtain a pressed blank;
step five: and (3) sintering: and putting the pressed compact into sintering equipment for sintering, and naturally cooling to obtain a finished product.
Preferably, the wet grinding machine in the second step is a 300L wet grinding machine, the wet grinding time of the wet grinding machine is controlled to be 30-60h, the sintering equipment in the fifth step is a pressure sintering furnace, and the sintering temperature of the sintering equipment is controlled to be 1380-1450 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) when the chromium-containing hard alloy material and the preparation process thereof are used, the tungsten carbide powder, the cobalt powder, the nickel powder, the chromium powder and the molybdenum powder are fused with each other, so that the chromium-containing hard alloy material has excellent electric corrosion resistance, is suitable for occasions adopting electric processing, has good comprehensive performance, has the hardness of HRA90.5 and the bending strength of 3000 MPa.
(2) When the chromium-containing hard alloy material and the preparation process thereof are used, chromium powder is added instead of conventional chromium carbide powder, chromium carbide is generated by partial reaction, the dissolution and precipitation growth of tungsten carbide grains in the alloy can be inhibited, and the tungsten carbide grains are refined; in addition, the solid solution alloy phase is formed with the bonding metal cobalt element, nickel element and molybdenum element, so that the electric corrosion resistance of the invention can be improved.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Refer to FIG. 1
Example 1
A chromium-containing hard alloy material and a preparation process thereof comprise the following steps:
tungsten carbide powder, cobalt powder, nickel powder, chromium powder, and molybdenum powder;
the nickel powder content was 3.0 wt%, the chromium powder content was 2.0 wt%, the molybdenum powder content was 0.5 wt%, the cobalt powder content was 10.5 wt%, and the tungsten carbide powder content was 84 wt%.
In this embodiment, preferably, the tungsten carbide powder, the cobalt powder, the nickel powder, the chromium powder and the molybdenum powder are put into a stirrer according to the above ratio to be mixed and ground, the rotation speed of the stirrer is 450r/min, and the grinding time is 35 min.
In this embodiment, it is preferable that the nickel powder, the chromium powder, the cobalt powder, and the molybdenum powder form a solid solution binder phase during sintering, and the tungsten carbide powder is used to increase the hardness of the alloy material.
In this example, it is preferable that the FSSS particle size of the cobalt powder is 1.0 micron, the FSSS particle size of the nickel powder is 2 microns, and the FSSS particle size of the chromium powder is 1.0 micron.
The invention also provides a preparation process of the chromium-containing hard alloy material, which comprises the following steps:
the method comprises the following steps: preparing materials: weighing the raw material powder according to a proportion, and then putting the raw material powder into a stirrer for fully mixing;
step two: wet grinding: putting the fully mixed raw materials in the step one into a wet grinder for wet grinding;
step three: and (3) granulation: injecting the wet-milled material into a spray drying tower for spray granulation, wherein the outlet temperature at the bottom of the tower is 100 ℃, the internal pressure of the drying tower is 1.5kPa, and the particle size of the prepared material particles is controlled to be 40-500 microns;
step four: pressing: designing and manufacturing a pressing die according to the size and the shape of a product and the powder compression ratio, and pressing the die to obtain a pressed blank;
step five: and (3) sintering: and putting the pressed compact into sintering equipment for sintering, and naturally cooling to obtain a finished product.
In this embodiment, preferably, the wet grinder in the second step is a 300L wet grinder, the wet grinding time of the wet grinder is controlled to be 60h, the sintering equipment in the fifth step is a pressure sintering furnace, and the sintering temperature of the sintering equipment is controlled to be 1390 ℃.
The working principle and the using process of the invention are as follows:
when the chromium-containing hard alloy material and the preparation process thereof are used, the tungsten carbide powder, the cobalt powder, the nickel powder, the chromium powder and the molybdenum powder are fused with each other, so that the chromium-containing hard alloy material has excellent electric corrosion resistance, is suitable for occasions adopting electric processing, has good comprehensive performance, has the hardness of HRA90.5 and the bending strength of 3000 MPa.
When the chromium-containing hard alloy material and the preparation process thereof are used, the chromium powder is added instead of the conventional chromium carbide powder, part of the chromium carbide is generated through reaction, the dissolution and the precipitation of tungsten carbide grains in the alloy can be inhibited, the tungsten carbide grains are refined, and in addition, the solid solution alloy phase is formed with the bonding metal cobalt powder, the nickel powder and the molybdenum powder, so the electric corrosion resistance of the chromium-containing hard alloy material can be improved.
Example 2
A chromium-containing hard alloy material and a preparation process thereof comprise the following steps:
tungsten carbide powder, cobalt powder, nickel powder, chromium powder, and molybdenum powder;
1.5 wt% of nickel powder, 1.5 wt% of chromium powder, 0.3 wt% of molybdenum powder, 10 wt% of cobalt powder and 86.7 wt% of tungsten carbide powder.
In this embodiment, preferably, the tungsten carbide powder, the cobalt powder, the nickel powder, the chromium powder and the molybdenum powder are put into a stirrer according to the above ratio to be mixed and ground, the rotation speed of the stirrer is 450r/min, and the grinding time is 55 min.
In this embodiment, it is preferable that the nickel powder, the chromium powder, the cobalt powder, and the molybdenum powder form a solid solution binder phase during sintering, and the tungsten carbide powder is used to increase the hardness of the alloy material.
In this example, it is preferable that the FSSS particle size of the cobalt powder is 1.0 micron, the FSSS particle size of the nickel powder is 2 microns, and the FSSS particle size of the chromium powder is 1.0 micron.
The invention also provides a preparation process of the chromium-containing hard alloy material, which comprises the following steps:
the method comprises the following steps: preparing materials: weighing the raw material powder according to a proportion, and then putting the raw material powder into a stirrer for fully mixing;
step two: wet grinding: putting the fully mixed raw materials in the step one into a wet grinder for wet grinding;
step three: and (3) granulation: injecting the wet-milled material into a spray drying tower for spray granulation, wherein the outlet temperature at the bottom of the tower is 110 ℃, the internal pressure of the drying tower is 1.9kPa, and the particle size of the prepared material particles is controlled to be 40-500 microns;
step four: pressing: designing and manufacturing a pressing die according to the size and the shape of a product and the powder compression ratio, and pressing the die to obtain a pressed blank;
step five: and (3) sintering: and putting the pressed compact into sintering equipment for sintering, and naturally cooling to obtain a finished product.
In this embodiment, preferably, the wet grinding machine in the second step is a 300L wet grinding machine with a wet grinding time controlled to be 32h, the sintering equipment in the fifth step is a pressure sintering furnace, and the sintering temperature of the sintering equipment is controlled to be 1440 ℃.
Example 3
A chromium-containing hard alloy material and a preparation process thereof comprise the following steps:
tungsten carbide powder, cobalt powder, nickel powder, chromium powder, and molybdenum powder;
the nickel powder content was 2.0 wt%, the chromium powder content was 1.5 wt%, the molybdenum powder content was 0.2 wt%, the cobalt powder content was 11 wt%, and the tungsten carbide powder content was 85.3 wt%.
In this embodiment, preferably, the tungsten carbide powder, the cobalt powder, the nickel powder, the chromium powder and the molybdenum powder are put into a stirrer according to the above ratio to be mixed and ground, the rotation speed of the stirrer is 450r/min, and the grinding time is 45 min.
In this embodiment, it is preferable that the nickel powder, the chromium powder, the cobalt powder, and the molybdenum powder form a solid solution binder phase during sintering, and the tungsten carbide powder is used to increase the hardness of the alloy material.
In this example, it is preferable that the FSSS particle size of the cobalt powder is 1.0 micron, the FSSS particle size of the nickel powder is 2 microns, and the FSSS particle size of the chromium powder is 1.0 micron.
The invention also provides a preparation process of the chromium-containing hard alloy material, which comprises the following steps:
the method comprises the following steps: preparing materials: weighing the raw material powder according to a proportion, and then putting the raw material powder into a stirrer for fully mixing;
step two: wet grinding: putting the fully mixed raw materials in the step one into a wet grinder for wet grinding;
step three: and (3) granulation: injecting the wet-milled material into a spray drying tower for spray granulation, wherein the outlet temperature at the bottom of the tower is 90 ℃, the internal pressure of the drying tower is 1.2kPa, and the particle size of the prepared material particles is controlled to be 40-500 microns;
step four: pressing: designing and manufacturing a pressing die according to the size and the shape of a product and the powder compression ratio, and pressing the die to obtain a pressed blank;
step five: and (3) sintering: and putting the pressed compact into sintering equipment for sintering, and naturally cooling to obtain a finished product.
In this embodiment, preferably, the wet grinder in the second step is a 300L wet grinder with a wet grinding time controlled to be 50h, the sintering device in the fifth step is a pressure sintering furnace, and the sintering temperature of the sintering device is controlled to be 1410 ℃.
Example 4
A chromium-containing hard alloy material and a preparation process thereof comprise the following steps:
tungsten carbide powder, cobalt powder, nickel powder, chromium powder, and molybdenum powder;
the nickel powder content was 3 wt%, the chromium powder content was 1.5 wt%, the molybdenum powder content was 0.5 wt%, the cobalt powder content was 9 wt%, and the tungsten carbide powder content was 86 wt%.
In this embodiment, preferably, the tungsten carbide powder, the cobalt powder, the nickel powder, the chromium powder and the molybdenum powder are put into a stirrer according to the above ratio to be mixed and ground, the rotation speed of the stirrer is 450r/min, and the grinding time is 45 min.
In this embodiment, preferably, the nickel powder, the chromium powder, the cobalt powder, and the molybdenum powder form a solid solution binder phase during sintering, and the tungsten carbide powder is used to increase the hardness of the alloy material.
In this example, it is preferable that the FSSS particle size of the cobalt powder is 1.0 micron, the FSSS particle size of the nickel powder is 2 microns, and the FSSS particle size of the chromium powder is 1.0 micron.
The invention also provides a preparation process of the chromium-containing hard alloy material, which comprises the following steps:
the method comprises the following steps: preparing materials: weighing the raw material powder according to a proportion, and then putting the raw material powder into a stirrer for fully mixing;
step two: wet grinding: putting the fully mixed raw materials in the step one into a wet grinder for wet grinding;
step three: and (3) granulation: injecting the wet-milled material into a spray drying tower for spray granulation, wherein the outlet temperature at the bottom of the tower is 95 ℃, the internal pressure of the drying tower is 1.5kPa, and the particle size of the prepared material particles is controlled to be 40-500 microns;
step four: pressing: designing and manufacturing a pressing die according to the size and the shape of a product and the powder compression ratio, and pressing the die to obtain a pressed blank;
step five: and (3) sintering: and putting the pressed compact into sintering equipment for sintering, and naturally cooling to obtain a finished product.
In this embodiment, preferably, the wet grinder in the second step is a 300L wet grinder with a wet grinding time controlled to be 40h, the sintering device in the fifth step is a pressure sintering furnace, and the sintering temperature of the sintering device is controlled to be 1420 ℃.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A chromium-containing cemented carbide material comprising:
tungsten carbide powder, cobalt powder, nickel powder, chromium powder, and molybdenum powder;
the nickel powder content is 1.0-3.0 wt%, the chromium powder content is 0.5-2.0 wt%, the molybdenum powder content is 0.1-0.5 wt%, the cobalt powder content is 10-12 wt%, and the tungsten carbide powder content is 80-90 wt%.
2. The chromium-containing cemented carbide material of claim 1, wherein: and putting the tungsten carbide powder, the cobalt powder, the nickel powder, the chromium powder and the molybdenum powder into a stirrer according to the proportion for mixing and grinding, wherein the rotating speed of the stirrer is 450r/min, and the grinding time is 35-55 min.
3. The chromium-containing cemented carbide material of claim 1, wherein: the nickel powder, the chromium powder, the cobalt powder and the molybdenum powder form a solid-solution binder phase during sintering, and the tungsten carbide powder is used for improving the hardness of an alloy material.
4. The chromium-containing cemented carbide material of claim 1, wherein: the FSSS particle size of the cobalt powder is 1.0 micron, the FSSS particle size of the nickel powder is 2 microns, and the FSSS particle size of the chromium powder is 1.0 micron.
5. A preparation process of a chromium-containing hard alloy material is characterized by comprising the following steps:
the method comprises the following steps: preparing materials: weighing the raw material powder according to a proportion, and then putting the raw material powder into a stirrer for fully mixing;
step two: wet grinding: putting the fully mixed raw materials in the step one into a wet grinder for wet grinding;
step three: and (3) granulation: injecting the wet-milled material into a spray drying tower for spray granulation, wherein the outlet temperature at the bottom of the tower is 90-110 ℃, the internal pressure of the drying tower is 1.2-1.9kPa, and the particle size of the prepared material particles is controlled to be 40-500 microns;
step four: pressing: designing and manufacturing a pressing die according to the size and the shape of a product and the powder compression ratio, and pressing the die to obtain a pressed blank;
step five: and (3) sintering: and putting the pressed compact into sintering equipment for sintering, and naturally cooling to obtain a finished product.
6. The process according to claim 5, wherein the chromium-containing cemented carbide material is prepared by the following steps: the wet grinding machine in the step two is a 300L inclinable wet grinding machine, the wet grinding time of the wet grinding machine is controlled to be 30-60h, the sintering equipment in the step five is a pressure sintering furnace, and the sintering temperature of the sintering equipment is controlled to be 1380-1450 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115074592A (en) * | 2022-06-28 | 2022-09-20 | 河源正信硬质合金有限公司 | High-temperature-resistant high-toughness hard alloy material for die and preparation method thereof |
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| EP1857204A1 (en) * | 2006-05-17 | 2007-11-21 | MEC Holding GmbH | Nonmagnetic material for producing parts or coatings adapted for high wear and corrosion intensive applications, nonmagnetic drill string component, and method for the manufacture thereof |
| CN109295374A (en) * | 2018-12-12 | 2019-02-01 | 株洲金韦硬质合金有限公司 | A kind of nickel is for cobalt hard alloy material and its preparation method and application |
| CN112342449A (en) * | 2020-10-16 | 2021-02-09 | 株洲明日硬质合金有限公司 | Hard alloy and preparation method and application thereof |
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2021
- 2021-04-08 CN CN202110375856.7A patent/CN113088782A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1857204A1 (en) * | 2006-05-17 | 2007-11-21 | MEC Holding GmbH | Nonmagnetic material for producing parts or coatings adapted for high wear and corrosion intensive applications, nonmagnetic drill string component, and method for the manufacture thereof |
| CN109295374A (en) * | 2018-12-12 | 2019-02-01 | 株洲金韦硬质合金有限公司 | A kind of nickel is for cobalt hard alloy material and its preparation method and application |
| CN112342449A (en) * | 2020-10-16 | 2021-02-09 | 株洲明日硬质合金有限公司 | Hard alloy and preparation method and application thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115074592A (en) * | 2022-06-28 | 2022-09-20 | 河源正信硬质合金有限公司 | High-temperature-resistant high-toughness hard alloy material for die and preparation method thereof |
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Application publication date: 20210709 |