CN112662981B - Wear-resistant ball with high-hardness coating and preparation method thereof - Google Patents
Wear-resistant ball with high-hardness coating and preparation method thereof Download PDFInfo
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- CN112662981B CN112662981B CN202011347974.9A CN202011347974A CN112662981B CN 112662981 B CN112662981 B CN 112662981B CN 202011347974 A CN202011347974 A CN 202011347974A CN 112662981 B CN112662981 B CN 112662981B
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Abstract
The invention discloses a high-hardness coating wear-resistant ball and a preparation method thereof, wherein the high-hardness coating wear-resistant ball comprises the following components: smelting by an electric furnace to obtain molten steel, casting to obtain a blank, heating the blank, rolling the blank into balls, and cooling to obtain a wear-resistant ball matrix; spraying the powder core wire material on the surface of the wear-resistant ball matrix by adopting an electric arc spraying method to form a coating, so as to obtain the wear-resistant ball containing the coating; heating the wear-resistant ball containing the coating to perform pulse magnetic field treatment to obtain a wear-resistant ball with a once-treated coating; and (3) carrying out hot isostatic pressing treatment on the wear-resistant ball with the primary treatment coating, cooling to room temperature, tempering at low temperature, and cooling to obtain the wear-resistant ball with the high-hardness coating. The wear-resistant ball coating has high bonding strength, high hardness, difficult spalling, excellent wear resistance and capability of effectively prolonging the service life of the wear-resistant ball.
Description
Technical Field
The invention relates to the technical field of wear-resistant materials, in particular to a high-hardness coating wear-resistant ball and a preparation method thereof.
Background
The wear-resistant ball is the most commonly used industrial grinding medium with the largest consumption, and is widely applied to the grinding procedures in the industries of metallurgical mines, cement building materials, thermal power generation and the like. Because the abrasion loss of the grinding ball is large, the grinding ball needs to be replaced frequently in practical application, the production cost is increased, and because the grinding ball needs to be replaced, a large amount of production time is occupied, and the production efficiency is reduced. Therefore, how to increase the hardness of the wear-resistant ball, reduce the abrasion, and prolong the service life of the wear-resistant ball has become a focus of attention. The coating with high hardness is formed on the surface of the wear-resistant ball, so that the wear resistance of the wear-resistant ball can be improved, but the coating on the surface of the wear-resistant ball has the problems of low impact toughness and easiness in cracking, and the bonding strength of the coating and a matrix is low, so that the protection capability of the coating on the matrix of the wear-resistant ball is limited, and the expected effects of reducing the ball consumption and prolonging the service life are difficult to achieve.
Disclosure of Invention
Based on the technical problems in the background technology, the invention provides a high-hardness coating wear-resistant ball and a preparation method thereof.
The invention provides a preparation method of a high-hardness coating wear-resistant ball, which comprises the following steps:
s1, smelting by an electric furnace to obtain molten steel with the following chemical components in percentage by mass: c:0.5-0.8%, si:1.0-1.5%, mn:1.4-1.8%, cr:0.5-0.8%, B:0.001-0.002%, the balance being Fe and unavoidable impurities, casting the molten steel to obtain a blank body, heating the blank body, rolling the blank body into balls, and cooling to obtain a wear-resistant ball matrix;
s2, adopting an electric arc spraying method to spray a powder core wire material on the surface of the wear-resistant ball matrix to form a coating, and obtaining the wear-resistant ball with the coating, wherein the powder core wire material comprises a powder core and a skin, and the powder core comprises the following components in percentage by mass: cr (Cr) 3 C 2 :50-60%, cr:3-8%, mn:2-4%, B:1-2%, si:1-1.5% of Fe and the balance of Fe, wherein the outer skin is a stainless steel belt;
s3, heating the wear-resistant ball containing the coating to 880-920 ℃, and then preserving heat for 20-30min under the action of a pulse magnetic field to obtain a wear-resistant ball with a once-treated coating;
s4, cooling the primary treatment coating wear-resistant ball to 820-850 ℃, then placing the ball in hot isostatic pressing equipment, preserving heat for 3-5min under the pressure of 80-100MPa, cooling to room temperature, tempering at low temperature, and cooling to obtain the high-hardness coating wear-resistant ball.
Preferably, the mass of the powder core accounts for 35-40% of the total mass of the powder core wire.
Preferably, the stainless steel band is a 304 stainless steel band or a 316 stainless steel band.
Preferably, the thickness of the coating formed on the surface of the wear-resistant ball matrix is 0.3-0.4mm.
Preferably, in the step S3, the magnetic field strength of the pulsed magnetic field is 0.6-1T, and the pulse frequency is 1-5HZ.
Preferably, in the step S2, the process parameters of arc spraying are as follows: the compressed air pressure is 0.4-0.6MPa, the spraying distance is 150-200mm, the current is 200-220A, and the voltage is 28-30V.
Preferably, in the step S4, the low-temperature tempering is performed at 200-240 ℃ for 30-90min.
Preferably, in the step S1, the temperature of electric furnace smelting is 1520-1560 ℃.
Preferably, in the step S1, the blank is heated to 1060-1120 ℃, then rolled into balls, and cooled to obtain the wear-resistant ball matrix.
A high-hardness coating wear-resistant ball is obtained by the preparation method.
The beneficial effects of the invention are as follows:
the invention prepares the coating on the wear-resistant ball matrix through electric arc spraying, adjusts the components of the powder core wire of the electric arc spraying, so that the coating has high hardness, and through the subsequent pulse magnetic field treatment and hot isostatic pressing treatment, the pulse magnetic field treatment can play the roles of improving dislocation density and refining grains, thereby being beneficial to further improving the hardness of the coating, promoting the interdiffusion of the coating and the matrix interface, improving the bonding strength of the coating, and the hot isostatic pressing treatment can reduce loose pore structures in the coating and the matrix, and lead the grains to be refined and organized uniformly, improving the strength and toughness of the wear-resistant ball, and simultaneously, further promoting the interdiffusion of the coating and the matrix interface, strengthening the metallurgical bonding and better improving the bonding strength of the coating. By selecting proper process conditions, the invention greatly improves the bonding strength of the coating, reduces the peeling failure of the coating, and simultaneously ensures that the wear-resistant ball has high hardness and high toughness, thereby effectively improving the wear resistance and the crushing resistance of the wear-resistant ball and prolonging the service life of the wear-resistant ball.
Detailed Description
The technical scheme of the invention is described in detail through specific embodiments.
Example 1
A preparation method of a wear-resistant ball with a high-hardness coating comprises the following steps:
s1, smelting by an electric furnace at 1520 ℃ to obtain molten steel with the following chemical components in percentage by mass: c:0.5%, si:1.0%, mn:1.4%, cr:0.8%, B:0.001%, the balance of Fe and unavoidable impurities, casting the molten steel to obtain a blank, heating the blank to 1060 ℃, rolling into balls, and cooling to obtain a wear-resistant ball matrix;
s2, adopting an electric arc spraying method to spray a powder core wire material on the surface of the wear-resistant ball matrix to form a coating with the thickness of 0.3mm, and obtaining the wear-resistant ball with the coating, wherein the powder core wire material comprises a powder core and a sheath, the mass of the powder core accounts for 40% of the total mass of the powder core wire material, and the powder core comprises the following components in percentage by mass: cr (Cr) 3 C 2 :50%, cr:3%, mn:2%, B:1%, si:1 percent of Fe and the balance of 304 stainless steel strip, wherein the technological parameters of electric arc spraying are as follows: compressed air pressure 0.4MPa, spraying distance 150mm, current 200A and voltage 28V;
s3, heating the wear-resistant ball containing the coating to 880 ℃, and then preserving heat for 20min under the action of a pulse magnetic field with the magnetic field strength of 0.6T and the pulse frequency of 1HZ to obtain a wear-resistant ball with a once-treated coating;
s4, cooling the primary treatment coating wear-resistant ball to 820 ℃, then placing the ball in hot isostatic pressing equipment, preserving heat for 5min under the condition of 80MPa, cooling to room temperature, tempering at 200 ℃ for 90min, and cooling to obtain the high-hardness coating wear-resistant ball.
Example 2
A preparation method of a wear-resistant ball with a high-hardness coating comprises the following steps:
s1, smelting at 1560 ℃ by an electric furnace to obtain molten steel with the following chemical components in percentage by mass: c:0.8%, si:1.5%, mn:1.8%, cr:0.5%, B:0.002 percent of Fe and the balance of unavoidable impurities, casting the molten steel to obtain a blank body, heating the blank body to 1120 ℃, rolling into balls, and cooling to obtain a wear-resistant ball matrix;
s2, adopting an electric arc spraying method to spray a powder core wire material on the surface of the wear-resistant ball matrix to form a coating with the thickness of 0.4mm, and obtaining the wear-resistant ball with the coating, wherein the powder core wire material comprises a powder core and a sheath, the mass of the powder core accounts for 35% of the total mass of the powder core wire material, and the powder core comprises the following components in percentage by mass: cr (Cr) 3 C 2 :60%, cr:8%, mn:4%, B:2%, si:1.5 percent of Fe and the balance of 304 stainless steel strip, wherein the arc spraying is carried outThe process parameters of (a) are as follows: compressed air pressure 0.6MPa, spraying distance 200mm, current 220A, voltage 30V;
s3, heating the wear-resistant ball containing the coating to 920 ℃, and then preserving heat for 30min under the action of a pulse magnetic field with the magnetic field strength of 1T and the pulse frequency of 5HZ to obtain a wear-resistant ball with a once-treated coating;
s4, cooling the primary treatment coating wear-resistant ball to 850 ℃, then placing the ball in hot isostatic pressing equipment, preserving heat for 3min under the condition of 100MPa, cooling to room temperature, tempering at 240 ℃ for 30min, and cooling to obtain the high-hardness coating wear-resistant ball.
Example 3
A preparation method of a wear-resistant ball with a high-hardness coating comprises the following steps:
s1, smelting by an electric furnace at 1550 ℃ to obtain molten steel with the following chemical components in percentage by mass: c:0.6%, si:1.2%, mn:1.6%, cr:0.6%, B:0.0015% of Fe and the balance of unavoidable impurities, casting the molten steel to obtain a blank, heating the blank to 1100 ℃, rolling into balls, and cooling to obtain a wear-resistant ball matrix;
s2, adopting an electric arc spraying method to spray a powder core wire material on the surface of the wear-resistant ball matrix to form a coating with the thickness of 0.35mm, and obtaining the wear-resistant ball with the coating, wherein the powder core wire material comprises a powder core and a sheath, the mass of the powder core accounts for 38% of the total mass of the powder core wire material, and the powder core comprises the following components in percentage by mass: cr (Cr) 3 C 2 :55%, cr:5%, mn:3%, B:1.5%, si:1.4 percent of Fe and the balance of 304 stainless steel strip, wherein the technological parameters of electric arc spraying are as follows: compressed air pressure 0.5MPa, spraying distance 180mm, current 215A, voltage 29V;
s3, heating the wear-resistant ball containing the coating to 900 ℃, and then preserving heat for 25min under the action of a pulse magnetic field with the magnetic field strength of 0.8T and the pulse frequency of 3HZ to obtain a wear-resistant ball with a once-treated coating;
s4, air cooling the primary treatment coating wear-resistant ball to 840 ℃, then placing the ball in hot isostatic pressing equipment, preserving heat for 4min under the condition that the pressure is 90MPa, then cooling to room temperature, tempering at 220 ℃ for 60min, and cooling to obtain the high-hardness coating wear-resistant ball.
Comparative example 1
A method for preparing a wear-resistant ball with a coating, comprising the following steps:
s1, smelting by an electric furnace at 1550 ℃ to obtain molten steel with the following chemical components in percentage by mass: c:0.6%, si:1.2%, mn:1.6%, cr:0.6%, B:0.0015% of Fe and the balance of unavoidable impurities, casting the molten steel to obtain a blank, heating the blank to 1100 ℃, rolling into balls, cooling to room temperature, tempering at 220 ℃ for 60min, and cooling to obtain a wear-resistant ball matrix;
s2, adopting an electric arc spraying method to spray a powder core wire material on the surface of the wear-resistant ball matrix to form a coating with the thickness of 0.35mm, and obtaining the wear-resistant ball with the coating, wherein the powder core wire material comprises a powder core and a sheath, the mass of the powder core accounts for 38% of the total mass of the powder core wire material, and the powder core comprises the following components in percentage by mass: cr (Cr) 3 C 2 :55%, cr:5%, mn:3%, B:1.5%, si:1.4 percent of Fe and the balance of 304 stainless steel strip, wherein the technological parameters of electric arc spraying are as follows: compressed air pressure 0.5MPa, spraying distance 180mm, current 215A, voltage 29V.
The wear resistant balls prepared in example 3 and comparative example 1 were subjected to performance tests, wherein hardness tests were referred to GB/T8640-1988 and coating bond strength tests were referred to ASTM C633-2013. The test results are shown in table 1:
table 1 results of wear ball performance test
| Test item | Example 3 | Comparative example 1 |
| Hardness (H)RC) | 70 | 68 |
| Coating bond Strength (MPa) | 62.4 | 48.5 |
Therefore, the wear-resistant ball coating has high bonding strength, high hardness, difficult spalling, excellent wear resistance and capability of effectively prolonging the service life of the wear-resistant ball.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (7)
1. The preparation method of the wear-resistant ball with the high-hardness coating is characterized by comprising the following steps of:
s1, smelting by an electric furnace to obtain molten steel with the following chemical components in percentage by mass: c:0.5-0.8%, si:1.0-1.5%, mn:1.4-1.8%, cr:0.5-0.8%, B:0.001-0.002%, the balance being Fe and unavoidable impurities, casting the molten steel to obtain a blank body, heating the blank body, rolling the blank body into balls, and cooling to obtain a wear-resistant ball matrix;
s2, adopting an electric arc spraying method to spray a powder core wire material on the surface of the wear-resistant ball matrix to form a coating, and obtaining the wear-resistant ball with the coating, wherein the powder core wire material comprises a powder core and a skin, and the powder core comprises the following components in percentage by mass: cr (Cr) 3 C 2 :50-60%, cr:3-8%, mn:2-4%, B:1-2%, si:1-1.5% of Fe and the balance of Fe, wherein the outer skin is a stainless steel belt; the mass of the powder core accounts for 35-40% of the total mass of the powder core wire; the thickness of the coating formed on the surface of the wear-resistant ball matrix is 0.3-0.4mm；
S3, heating the wear-resistant ball containing the coating to 880-920 ℃, and then preserving heat for 20-30min under the action of a pulse magnetic field to obtain a wear-resistant ball with a once-treated coating; the magnetic field intensity of the pulse magnetic field is 0.6-1T, and the pulse frequency is 1-5HZ;
s4, cooling the primary treatment coating wear-resistant ball to 820-850 ℃, then placing the ball in hot isostatic pressing equipment, preserving heat for 3-5min under the pressure of 80-100MPa, cooling to room temperature, tempering at low temperature, and cooling to obtain the high-hardness coating wear-resistant ball.
2. The method for producing a high hardness coated wear resistant ball according to claim 1, wherein the stainless steel belt is 304 stainless steel belt or 316 stainless steel belt.
3. The method for preparing the wear-resistant ball with the high-hardness coating according to claim 1, wherein in the step S2, the process parameters of arc spraying are as follows: the compressed air pressure is 0.4-0.6MPa, the spraying distance is 150-200mm, the current is 200-220A, and the voltage is 28-30V.
4. The method for preparing the high-hardness coated wear-resistant ball according to claim 1, wherein in the step S4, the low-temperature tempering is performed at 200-240 ℃ for 30-90min.
5. The method for producing high-hardness coated wear-resistant balls according to claim 1, wherein in step S1, the electric furnace melting temperature is 1520-1560 ℃.
6. The method for preparing the wear-resistant ball with the high-hardness coating according to claim 1, wherein in the step S1, the blank is heated to 1060-1120 ℃, then rolled into a ball, and cooled to obtain the wear-resistant ball matrix.
7. A high hardness coated wear resistant ball obtained by the method of any one of claims 1-6.
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| CN101579958A (en) * | 2009-06-29 | 2009-11-18 | 中国科学院等离子体物理研究所 | Steel-based multifunctional ceramic composite coating and preparation method thereof |
| CN102965612A (en) * | 2012-11-07 | 2013-03-13 | 大连理工大学 | Preparation method of WC-Ni hard alloy coating for nuclear main pump components |
| CN103451589A (en) * | 2013-08-28 | 2013-12-18 | 黑龙江八一农垦大学 | Amorphous nanocrystalline wear-resistant coating material of agricultural implement soil-contacting part as well as plasma spraying method |
| CN107779809A (en) * | 2017-10-23 | 2018-03-09 | 宁国市正兴耐磨材料有限公司 | A kind of preparation method of composite coating wear-resistant ball |
| CN108842041A (en) * | 2018-07-13 | 2018-11-20 | 宁国市正兴耐磨材料有限公司 | A kind of multi-layer wear-resistant ball and preparation method thereof can be used for grinding strong oxidizing property material |
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- 2020-11-26 CN CN202011347974.9A patent/CN112662981B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101579958A (en) * | 2009-06-29 | 2009-11-18 | 中国科学院等离子体物理研究所 | Steel-based multifunctional ceramic composite coating and preparation method thereof |
| CN102965612A (en) * | 2012-11-07 | 2013-03-13 | 大连理工大学 | Preparation method of WC-Ni hard alloy coating for nuclear main pump components |
| CN103451589A (en) * | 2013-08-28 | 2013-12-18 | 黑龙江八一农垦大学 | Amorphous nanocrystalline wear-resistant coating material of agricultural implement soil-contacting part as well as plasma spraying method |
| CN107779809A (en) * | 2017-10-23 | 2018-03-09 | 宁国市正兴耐磨材料有限公司 | A kind of preparation method of composite coating wear-resistant ball |
| CN108842041A (en) * | 2018-07-13 | 2018-11-20 | 宁国市正兴耐磨材料有限公司 | A kind of multi-layer wear-resistant ball and preparation method thereof can be used for grinding strong oxidizing property material |
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