CN111621685B - Corrosion-resistant hard alloy with double-crystal structure and preparation method thereof - Google Patents
Corrosion-resistant hard alloy with double-crystal structure and preparation method thereof Download PDFInfo
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- CN111621685B CN111621685B CN202010701416.1A CN202010701416A CN111621685B CN 111621685 B CN111621685 B CN 111621685B CN 202010701416 A CN202010701416 A CN 202010701416A CN 111621685 B CN111621685 B CN 111621685B
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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
- C22C29/005—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides comprising a particular metallic binder
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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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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a corrosion-resistant hard alloy with a double-crystal structure, which is characterized by comprising the following raw materials in parts by weight: 15-20 parts of nickel powder, 10-12 parts of aluminum powder, 1.5-3.5 parts of vanadium carbide powder, 1.5-2.5 parts of chromium carbide powder, 5-10 parts of molybdenum powder and 66-74 parts of tungsten carbide powder; wherein the tungsten carbide powder consists of tungsten carbide powder with the granularity of 1.5-2.1 microns and tungsten carbide powder with the granularity of 5-10 microns, and the tungsten carbide powder with the granularity of 1.5-2.1 microns accounts for 50-66 parts, and the tungsten carbide powder with the granularity of 5-10 microns accounts for 8-16 parts. The invention effectively improves the corrosion resistance and the overall quality and performance.
Description
Technical Field
The invention belongs to the technical field of hard alloy, and particularly relates to corrosion-resistant hard alloy with a double-crystal structure and a preparation method thereof.
Background
WC-Co hard alloy is widely applied to the fields of cutting tools, dies, mining tools, wear-resistant parts and the like due to high hardness, wear resistance and transverse rupture strength. Generally speaking, the hard alloy with high hardness and high wear resistance is prepared, the fracture toughness of the hard alloy is basically sacrificed to meet the requirement, and generally, the thinner the structure of the alloy is, the higher the hardness is, and the better the wear resistance is; the strength is reduced, the brittleness is increased, and the welding performance is deteriorated. On the contrary, the thicker the structure of the alloy, the higher the bending strength and the better the impact resistance, and the wear resistance and hardness will be reduced accordingly. During the use of cemented carbide articles, it is often desirable that the articles have both good toughness and good wear resistance. The hard alloy with the special twinned structure has excellent comprehensive properties of high strength, high toughness, high wear resistance and the like.
Although the hardness and toughness of the existing dual-crystal structure hard alloy are improved to a certain extent, the corrosion resistance is still insufficient.
Disclosure of Invention
The invention aims to provide corrosion-resistant hard alloy with a double-crystal structure.
In order to solve the technical problems, the invention adopts the following technical scheme:
the corrosion-resistant hard alloy with the double-crystal structure comprises the following raw materials in parts by weight:
15-20 parts of nickel powder, 10-12 parts of aluminum powder, 1.5-3.5 parts of vanadium carbide powder, 1.5-2.5 parts of chromium carbide powder, 5-10 parts of molybdenum powder and 66-74 parts of tungsten carbide powder;
wherein the tungsten carbide powder consists of tungsten carbide powder with the granularity of 1.5-2.1 microns and tungsten carbide powder with the granularity of 5-10 microns, and the tungsten carbide powder with the granularity of 1.5-2.1 microns accounts for 50-66 parts, and the tungsten carbide powder with the granularity of 5-10 microns accounts for 8-16 parts.
The carbon content of the tungsten carbide powder is 7-9%.
The alloy consists of the following raw materials in parts by weight:
18 parts of nickel powder, 11 parts of aluminum powder, 2 parts of vanadium carbide powder, 2 parts of chromium carbide powder, 8 parts of molybdenum powder and 70 parts of tungsten carbide powder.
A preparation method of corrosion-resistant hard alloy with a double-crystal structure comprises the following steps:
placing tungsten carbide powder with the particle size of 5-10 microns in a ball mill for grinding, then adding tungsten carbide powder, nickel powder, aluminum powder, vanadium carbide powder, chromium carbide powder and molybdenum powder with the particle size of 1.5-2.1 microns, and continuing grinding to obtain a uniformly mixed material;
and drying the mixed material, performing spray granulation, pressing into a pressed blank, sintering and cooling to obtain the finished hard alloy.
And the green compact is pressed and formed under the pressure of 420-480MPa, and a forming agent is added before pressing.
During the sintering, the temperature is maintained at 1360-1400 ℃, the vacuum degree is 1-2Pa, the heat preservation is carried out for 1-2 hours, then inert gas is introduced, the pressure is controlled within the range of 5-20MPa, the heat preservation is carried out for 20-30 minutes at 1380 ℃, and the mixture is cooled to the room temperature along with the furnace.
During grinding, absolute ethyl alcohol is used as a ball milling medium, and WC-Co hard alloy balls are used as grinding bodies.
The invention has stable bicrystal structure, so that the alloy has high toughness and high strength, and the corrosion resistance of the alloy can be greatly improved by adding aluminum.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to further understand the features and technical means of the invention and achieve specific objects and functions.
Example one
A preparation method of corrosion-resistant hard alloy with a double-crystal structure comprises the following steps:
the preparation method comprises the following steps of selecting raw materials, wherein the raw materials comprise, by weight, 15 parts of nickel powder, 10 parts of aluminum powder, 1.5 parts of vanadium carbide powder, 1.5 parts of chromium carbide powder, 5 parts of molybdenum powder and 66 parts of tungsten carbide powder, wherein the tungsten carbide powder comprises 60 parts of tungsten carbide powder with the granularity of 1.5 microns and 8 parts of tungsten carbide powder with the granularity of 5 microns.
And (2) placing tungsten carbide powder with the particle size of 5 microns in a ball mill for grinding, then adding tungsten carbide powder with the particle size of 1.5 microns, nickel powder, aluminum powder, vanadium carbide powder, chromium carbide powder and molybdenum powder, and continuing grinding to obtain a uniformly mixed material. During grinding, absolute ethyl alcohol is used as a ball milling medium, WC-Co hard alloy balls are used as grinding bodies, and the wear resistance of the grinding bodies is ensured.
Drying the mixed material, performing spray granulation, adding a forming agent, performing compression molding under the pressure of 420 MPa, and pressing into a green compact.
Sintering at 1360 deg.C and 1Pa, keeping the temperature for 1 hr, introducing inert gas under 5MPa, keeping the temperature at 1380 deg.C for 20 min, cooling to room temperature, and taking out to obtain the final product.
Example two
A preparation method of corrosion-resistant hard alloy with a double-crystal structure comprises the following steps:
the preparation method comprises the following steps of selecting raw materials, wherein the raw materials comprise, by weight, 18 parts of nickel powder, 11 parts of aluminum powder, 2 parts of vanadium carbide powder, 2 parts of chromium carbide powder and 8 parts of molybdenum powder, and the tungsten carbide powder comprises 62 parts of tungsten carbide powder with the granularity of 2 microns and 7 parts of tungsten carbide powder with the granularity of 8 microns.
And (2) placing tungsten carbide powder with the particle size of 8 microns in a ball mill for grinding, then adding tungsten carbide powder with the particle size of 2 microns, nickel powder, aluminum powder, vanadium carbide powder, chromium carbide powder and molybdenum powder, and continuing grinding to obtain a uniformly mixed material. During grinding, absolute ethyl alcohol is used as a ball milling medium, WC-Co hard alloy balls are used as grinding bodies, and the wear resistance of the grinding bodies is ensured.
Drying the mixed material, performing spray granulation, adding a forming agent, performing compression molding under the pressure of 450 MPa, and pressing into a green compact.
Sintering at 1380 ℃ and 2Pa of vacuum degree, preserving heat for 2 hours, introducing inert gas, controlling the pressure at 10MPa, preserving heat for 25 minutes at 1380 ℃, cooling to room temperature along with the furnace, and taking out to obtain the finished product of the hard alloy.
EXAMPLE III
A preparation method of corrosion-resistant hard alloy with a double-crystal structure comprises the following steps:
the preparation method comprises the following steps of selecting raw materials, wherein the raw materials comprise, by weight, 20 parts of nickel powder, 12 parts of aluminum powder, 3.5 parts of vanadium carbide powder, 2.5 parts of chromium carbide powder, 10 parts of molybdenum powder and 74 parts of tungsten carbide powder, wherein the tungsten carbide powder comprises 63 parts of tungsten carbide powder with the granularity of 2.1 micrometers and 11 parts of tungsten carbide powder with the granularity of 10 micrometers.
And (2) placing tungsten carbide powder with the particle size of 8 microns in a ball mill for grinding, then adding tungsten carbide powder with the particle size of 2 microns, nickel powder, aluminum powder, vanadium carbide powder, chromium carbide powder and molybdenum powder, and continuing grinding to obtain a uniformly mixed material. During grinding, absolute ethyl alcohol is used as a ball milling medium, WC-Co hard alloy balls are used as grinding bodies, and the wear resistance of the grinding bodies is ensured.
Drying the mixed material, performing spray granulation, adding a forming agent, performing compression molding under 480MPa, and pressing into a green compact.
Sintering at 1400 deg.C and 2Pa for 3 hr, introducing inert gas under 20MPa, holding at 1380 deg.C for 30 min, cooling to room temperature, and taking out to obtain the final product.
Although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications, equivalents, improvements, and the like can be made in the technical solutions of the foregoing embodiments or in some of the technical features of the foregoing embodiments, but those modifications, equivalents, improvements, and the like are all within the spirit and principle of the present invention.
Claims (4)
1. The preparation method of the corrosion-resistant hard alloy with the double-crystal structure is characterized by comprising the following steps of:
placing tungsten carbide powder with the granularity of 5-10 microns in a ball mill for grinding, adding tungsten carbide powder, nickel powder, aluminum powder, vanadium carbide powder, chromium carbide powder and molybdenum powder with the granularity of 1.5-2.1 microns, continuously grinding to obtain a uniformly mixed material, wherein the components in parts by weight are as follows: 15-20 parts of nickel powder, 10-12 parts of aluminum powder, 1.5-3.5 parts of vanadium carbide powder, 1.5-2.5 parts of chromium carbide powder, 5-10 parts of molybdenum powder and 66-74 parts of tungsten carbide powder; wherein the tungsten carbide powder consists of tungsten carbide powder with the granularity of 1.5-2.1 microns and tungsten carbide powder with the granularity of 5-10 microns, and the tungsten carbide powder with the granularity of 1.5-2.1 microns accounts for 50-66 parts, and the tungsten carbide powder with the granularity of 5-10 microns accounts for 8-16 parts;
and drying the mixed material, performing spray granulation, pressing into a pressed blank, sintering and cooling to obtain the finished hard alloy.
2. The method for preparing the corrosion-resistant cemented carbide with a twin-crystal structure as claimed in claim 1, wherein the green compact is pressed and formed under a pressure of 420-480MPa, and a forming agent is added before pressing.
3. The method for preparing corrosion-resistant cemented carbide with a twin-crystal structure as claimed in claim 2, wherein the temperature is maintained at 1360-1400 ℃ and the degree of vacuum is 1-2Pa during sintering, the temperature is maintained for 1-2 hours, then inert gas is introduced, the pressure is controlled within the range of 5-20MPa, the temperature is maintained at 1380 ℃ for 20-30 minutes, and the temperature is cooled to room temperature along with the furnace.
4. The method for preparing the corrosion-resistant cemented carbide with a twinned structure according to claim 3, wherein absolute ethyl alcohol is used as a ball milling medium during grinding, and WC-Co cemented carbide balls are used as a grinding body.
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| CN202010701416.1A CN111621685B (en) | 2020-07-21 | 2020-07-21 | Corrosion-resistant hard alloy with double-crystal structure and preparation method thereof |
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| CN111621685B true CN111621685B (en) | 2021-08-31 |
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| JPH07332030A (en) * | 1994-06-09 | 1995-12-19 | Mitsubishi Materials Corp | Internal combustion engine tappet member provided with tip material having high bonding strength |
| JP2004076049A (en) * | 2002-08-13 | 2004-03-11 | Hitachi Tool Engineering Ltd | Hard metal of ultra-fine particles |
| CN101415518A (en) * | 2006-01-31 | 2009-04-22 | 杰出金属实业公司 | High-performance friction stir welding tools |
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