CN111069586A - Wear-resistant powder metallurgy gear material containing yellow powder and preparation method thereof - Google Patents
Wear-resistant powder metallurgy gear material containing yellow powder and preparation method thereof Download PDFInfo
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- CN111069586A CN111069586A CN201811215862.0A CN201811215862A CN111069586A CN 111069586 A CN111069586 A CN 111069586A CN 201811215862 A CN201811215862 A CN 201811215862A CN 111069586 A CN111069586 A CN 111069586A
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- Prior art keywords
- wear
- powder metallurgy
- yellow powder
- gear material
- resistant
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- 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
- B22F3/02—Compacting only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- 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
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0264—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a wear-resistant powder metallurgy gear material containing yellow powder and a preparation method thereof, wherein the wear-resistant powder metallurgy gear material is prepared from the following components in percentage by mass: 95-99% of iron, 0.4-2% of carbon, 0.4-2% of zinc stearate and 0.2-1% of yellow powder, and the preparation method comprises the following steps: (1) ball milling is carried out on the raw materials, the ball-material ratio is 35: 1-55: 1, and the ball milling time is 3.5-4.5 h; (2) putting the material into a mold, pressurizing to 535-625 MPa, and pressing to obtain 3 with the density of 5.5-7.8 g/m; (3) and sintering, wherein the temperature of the first stage is 780-845 ℃, the sintering time is 3 hours, the temperature of the second stage is 940-990 ℃, the sintering time is 3 hours, and the yellow powder-containing wear-resistant powder metallurgy gear material is obtained after cooling.
Description
Technical Field
The invention relates to the field of powder metallurgy, in particular to a wear-resistant powder metallurgy gear material containing yellow powder and a preparation method thereof.
Background
Powder metallurgy sintering is performed below the melting point of the base metal, so that most refractory metals and their compounds can be manufactured only by powder metallurgy at present; the incompactness of powder metallurgy pressing is beneficial to preparing porous materials, bearings, antifriction materials and the like by controlling the density and porosity of products; the size of powder metallurgy compacted products is infinitely close to the final finished product size (no machining or little machining is required). The material utilization rate is high, so that metal can be greatly saved, and the product cost is reduced; the powder metallurgy products are produced by pressing the same die, the consistency among the workpieces is good, and the powder metallurgy products are suitable for the production of large-batch parts, in particular to products with high processing cost such as gears and the like; powder metallurgy can ensure the correctness and uniformity of materials through the proportion of components, and moreover, sintering is generally carried out in vacuum or reducing atmosphere, so that the materials are not polluted or oxidized, and high-purity materials can be prepared.
But some of the powder metallurgy parts have inferior properties to forged and some cast parts, such as ductility and impact resistance; the dimensional accuracy of the product is good, but is not as good as that obtained by some finished products; the non-compact nature of the part can have an impact on the post-processing treatment, which must be taken into account especially in heat treatment, electroplating and the like.
Therefore, there is a need to develop a wear-resistant powder metallurgy gear material and a preparation method thereof.
Disclosure of Invention
The invention aims to provide a powder metallurgy material which has the advantages of wear resistance, high tensile strength and impact energy, low cost and capability of manufacturing high-strength and wear-resistant gears and a preparation method thereof.
In order to achieve the purpose, the technical scheme of the invention is that the wear-resistant powder metallurgy gear material containing yellow powder is prepared from the following components in percentage by mass: 95-99% of iron, 0.4-2% of carbon, 0.4-2% of zinc stearate and 0.2-1% of yellow powder.
Preferably, the wear-resistant powder metallurgy gear material containing yellow powder is prepared from the following components in percentage by mass: 97.1 percent of iron, 0.9 percent of carbon, 1.2 percent of zinc stearate and 0.8 percent of yellow powder.
The invention also aims to provide a preparation method of the wear-resistant powder metallurgy gear material containing the yellow powder, which comprises the following steps:
step (1): the following raw materials are respectively taken according to the mass percentage: 95-99% of iron, 0.4-2% of carbon, 0.4-2% of zinc stearate and 0.2-1% of yellow powder; mixing the raw materials at a high speed until the materials are uniform; ball-milling the raw materials by using a ball mill, wherein the ball-material ratio is 35: 1-55: 1, and the ball-milling time is 3.5-4.5 h;
step (2): performing compression molding on the powder metallurgy material subjected to ball milling, putting the powder metallurgy material into a mold, pressurizing the mold until the pressure is 535-625 MPa, and pressing until the density of the material is 5.5-7.8 g/m 3;
and (3): and (3) performing high-temperature sintering on the powder metallurgy material after the pressing forming, wherein the high-temperature sintering temperature is divided into two stages, the temperature of the first stage is 780-845 ℃, the sintering time is 3 hours, the temperature of the second stage is increased to 940-990 ℃, the sintering time is 3 hours, and the yellow powder-containing wear-resistant powder metallurgy gear material is obtained after cooling.
Preferably, in the preparation method of the wear-resistant powder metallurgy gear material containing yellow powder, the die is pressurized until the pressure is 580 MPa.
Preferably, the yellow powder-containing wear-resistant powder metallurgy gear material is pressed in the preparation method until the density of the material is 6.4g/m 3.
Preferably, the temperature of the first stage in the preparation method of the wear-resistant powder metallurgy gear material containing yellow powder is 810 ℃.
Preferably, the temperature of the second stage in the preparation method of the wear-resistant powder metallurgy gear material containing yellow powder is 960 ℃.
The invention has the advantages and beneficial effects that: the compressive strength of the prepared powder metallurgy gear material is higher than that of the conventional powder metallurgy gear material, the wear-resisting strength of the gear is improved, and the performance of the powder metallurgy gear material is enhanced.
Detailed Description
The following further describes embodiments of the present invention with reference to examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
Step (1): the following raw materials are respectively taken according to the mass percentage: the components by mass percentage are as follows: 99% of iron, 0.4% of carbon, 0.4% of zinc stearate and 0.2% of yellow powder; mixing the raw materials at a high speed until the materials are uniform; ball-milling the raw materials by using a ball mill, wherein the ball-material ratio is 55:1, and the ball-milling time is 4.5 h; step (2): performing compression molding on the powder metallurgy material subjected to ball milling, putting the powder metallurgy material into a die, pressurizing the die until the pressure is 625MPa, and pressing until the density of the material is 7.8g/m 3; and (3): and (3) performing high-temperature sintering on the powder metallurgy material after the pressing forming, wherein the high-temperature sintering temperature is divided into two stages, the temperature of the first stage is 845 ℃, the sintering time is 3 hours, the temperature of the second stage is 940 ℃, the sintering time is 3 hours, and the yellow powder-containing wear-resistant powder metallurgy gear material is obtained after cooling.
Example 2
Step (1): the following raw materials are respectively taken according to the mass percentage: the components by mass percentage are as follows: 95% of iron, 2% of carbon, 2% of zinc stearate and 1% of yellow powder; mixing the raw materials at a high speed until the materials are uniform; ball-milling the raw materials by using a ball mill, wherein the ball-material ratio is 35:1, and the ball-milling time is 3.5 h; step (2): performing compression molding on the powder metallurgy material subjected to ball milling, putting the powder metallurgy material into a die, pressurizing the die until the pressure is 535MPa, and pressing until the density of the material is 5.5g/m 3; and (3): and (3) performing high-temperature sintering on the powder metallurgy material after the press forming, wherein the high-temperature sintering temperature is divided into two stages, the temperature of the first stage is 780 ℃, the sintering time is 3 hours, the temperature of the second stage is increased to 990 ℃, the sintering time is 3 hours, and the yellow powder-containing wear-resistant powder metallurgy gear material is obtained after cooling.
Example 3
Step (1): the following raw materials are respectively taken according to the mass percentage: 97.1 percent of iron, 0.9 percent of carbon, 1.2 percent of zinc stearate and 0.8 percent of yellow powder; mixing the raw materials at a high speed until the materials are uniform; ball-milling the raw materials by using a ball mill, wherein the ball-material ratio is 55:1, and the ball-milling time is 4.5 h; step (2): performing compression molding on the powder metallurgy material subjected to ball milling, putting the powder metallurgy material into a die, pressurizing the die until the pressure is 625MPa, and pressing until the density of the material is 7.8g/m 3; and (3): and (3) performing high-temperature sintering on the powder metallurgy material after the pressing forming, wherein the high-temperature sintering temperature is divided into two stages, the temperature of the first stage is 845 ℃, the sintering time is 3 hours, the temperature of the second stage is 940 ℃, the sintering time is 3 hours, and the yellow powder-containing wear-resistant powder metallurgy gear material is obtained after cooling.
Comparative example
Step (1): the following raw materials are respectively taken according to parts by weight: 8 parts of boron stearate, 9 parts of graphite, 10 parts of boron-copper alloy powder and the balance of iron powder; mixing the raw materials at a high speed until the materials are uniform; ball-milling the raw materials by using a ball mill, wherein the ball-material ratio is 55:1, and the ball-milling time is 4.5 h; step (2): performing compression molding on the powder metallurgy material subjected to ball milling, putting the powder metallurgy material into a die, pressurizing the die until the pressure is 625MPa, and pressing until the density of the material is 7.8g/m 3; and (3): and (3) performing high-temperature sintering on the powder metallurgy material after the compression molding, wherein the high-temperature sintering temperature is divided into two stages, the temperature of the first stage is 845 ℃, the sintering time is 3 hours, the temperature of the second stage is 940 ℃, the sintering time is 3 hours, and the powder metallurgy gear material is obtained after cooling.
The tensile strength and the compressive strength of the wear-resistant powder metallurgy gear material containing the yellow powder are as follows:
| tensile Strength (MPa) | Compressive strength (MPa) | |
| Example 1 | 501 | 304 |
| Example 2 | 504 | 310 |
| Example 3 | 539 | 327 |
| Comparative example | 466 | 279 |
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited thereto, and that various changes and modifications may be made without departing from the spirit of the invention, and the scope of the appended claims is to be accorded the full range of equivalents.
Claims (7)
1. The wear-resistant powder metallurgy gear material containing the yellow powder is characterized by being prepared from the following components in percentage by mass: 95-99% of iron, 0.4-2% of carbon, 0.4-2% of zinc stearate and 0.2-1% of yellow powder.
2. The wear-resistant powder metallurgy gear material containing yellow powder according to claim 1, wherein the wear-resistant powder metallurgy gear material containing yellow powder is prepared from the following components in percentage by mass: 97.1 percent of iron, 0.9 percent of carbon, 1.2 percent of zinc stearate and 0.8 percent of yellow powder.
3. The preparation method of the wear-resistant powder metallurgy gear material containing the yellow powder is characterized by comprising the following steps of:
step (1): the following raw materials are respectively taken according to parts by weight: 95-99% of iron, 0.4-2% of carbon, 0.4-2% of zinc stearate and 0.2-1% of yellow powder; mixing the raw materials at a high speed until the materials are uniform; ball-milling the raw materials by using a ball mill, wherein the ball-material ratio is 35: 1-55: 1, and the ball-milling time is 3.5-4.5 h;
step (2): performing compression molding on the powder metallurgy material subjected to ball milling, putting the powder metallurgy material into a mold, pressurizing the mold until the pressure is 535-625 MPa, and pressing until the density of the material is 5.5-7.8 g/m 3;
and (3): and (3) performing high-temperature sintering on the powder metallurgy material after the pressing forming, wherein the high-temperature sintering temperature is divided into two stages, the temperature of the first stage is 780-845 ℃, the sintering time is 3 hours, the temperature of the second stage is increased to 940-990 ℃, the sintering time is 3 hours, and the yellow powder-containing wear-resistant powder metallurgy gear material is obtained after cooling.
4. The method for preparing the wear-resistant powder metallurgy gear material containing the yellow powder according to claim 3, wherein the die is pressurized to 580MPa in the method for preparing the wear-resistant powder metallurgy gear material containing the yellow powder.
5. The method for preparing the yellow powder containing wear-resistant powder metallurgy gear material according to the claim 3, wherein the yellow powder containing wear-resistant powder metallurgy gear material is pressed in the method until the density of the material is 6.4g/m 3.
6. The method for preparing the wear-resistant powder metallurgy gear material containing the yellow powder according to claim 3, wherein the temperature of the first stage in the method for preparing the wear-resistant powder metallurgy gear material containing the yellow powder is 810 ℃.
7. The method for preparing the wear-resistant powder metallurgy gear material containing yellow powder according to claim 3, wherein the temperature of the second stage in the method for preparing the wear-resistant powder metallurgy gear material containing yellow powder is 960 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811215862.0A CN111069586A (en) | 2018-10-18 | 2018-10-18 | Wear-resistant powder metallurgy gear material containing yellow powder and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811215862.0A CN111069586A (en) | 2018-10-18 | 2018-10-18 | Wear-resistant powder metallurgy gear material containing yellow powder and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111069586A true CN111069586A (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811215862.0A Pending CN111069586A (en) | 2018-10-18 | 2018-10-18 | Wear-resistant powder metallurgy gear material containing yellow powder and preparation method thereof |
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| Country | Link |
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| CN (1) | CN111069586A (en) |
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2018
- 2018-10-18 CN CN201811215862.0A patent/CN111069586A/en active Pending
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Application publication date: 20200428 |