CN106884106B - Sintering method of injection-molded copper-based part - Google Patents
Sintering method of injection-molded copper-based part Download PDFInfo
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- CN106884106B CN106884106B CN201710239559.3A CN201710239559A CN106884106B CN 106884106 B CN106884106 B CN 106884106B CN 201710239559 A CN201710239559 A CN 201710239559A CN 106884106 B CN106884106 B CN 106884106B
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- sintering
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/04—Alloys based on copper with zinc as the next major constituent
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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
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
- B22F3/101—Changing atmosphere
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/02—Alloys based on zinc with copper as the next major constituent
-
- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention provides a sintering method of an injection-molded copper-based part, which comprises the following steps: (1) selecting copper alloy powder and a binder, and preparing the copper alloy powder and the binder into a feed according to a preset volume ratio; (2) placing the feed on a copper alloy powder injection machine to form an injection blank, and removing part of the binder from the injection blank through an organic solvent to form a degreased blank; (3) placing the degreased blank in a sintering furnace with an integrated vacuum atmosphere and gradually heating; (4) introducing gas, degreasing at low temperature, sintering at high temperature, and making into sintered blank. According to the method, hydrogen is introduced into the low-temperature section to avoid the reaction of the hydrogen and graphite contained in the sintering furnace, so that the degreasing is more complete, the oxygen content of the copper alloy powder particles is reduced, the activity is increased, and the sintering is facilitated; argon is introduced into the high-temperature section, so that the volatilization of alloy components in the copper alloy powder is avoided, and the pollution to a sintering furnace and the change of material components are avoided.
Description
Technical Field
The invention relates to the technical field of sintering, in particular to a sintering method of an injection-molded copper-based part.
Background
Copper is the metal used by human beings at the earliest and is one of the most widely used metals at present, copper and copper alloy occupy important positions in the fields of industry, agriculture, national defense, military and aerospace, communication and the like due to excellent electric conductivity, ductility, machinability and corrosion resistance of the copper and the copper alloy, copper-based parts are visible everywhere, and in order to save materials and reduce waste, the powder metallurgy method is adopted to manufacture the copper-based parts, so that the copper-based parts are more and more widely used. The key point of copper-based powder metallurgy parts lies in forming and sintering, the sintering of traditional copper-based powder metallurgy products generally adopts a mesh belt type continuous furnace, a bell jar furnace, a well type furnace and a muffle furnace under the protection of ammonia decomposition atmosphere and normal pressure for sintering, most of the sintered products are traditional powder pressed products, the shapes of the products are simple, and the addition amount of a forming agent is less, so that the performance requirements of the common products can be met by the conventional sintering. However, for the copper-based material formed by metal injection molding, the binder content is high, the binder is difficult to remove, in order to effectively remove the binder, the temperature rising speed is very slow, a large amount of ammonia decomposition atmosphere is required to be introduced, the traditional sintering method is low in efficiency, the yield of the product is low, and the production cost is naturally increased.
Disclosure of Invention
Based on this, a sintering method of an injection-molded copper-based component is provided.
A method of sintering an injection molded copper-based component, comprising the steps of:
(1) selecting copper alloy powder and a binder, and preparing the copper alloy powder and the binder into a feed according to a preset volume ratio;
(2) placing the feed on a copper alloy powder injection machine to form an injection blank, and removing part of the binder from the injection blank through an organic solvent to form a degreased blank;
(3) placing the degreased blank in a sintering furnace and gradually heating;
(4) introducing gas, degreasing at low temperature, sintering at high temperature, and making into sintered blank.
Preferably, the binder in step (1) is paraffin-based.
Preferably, the copper alloy powder in the step (1) is one or more of CuZn10, CuZn30, Cu80Zn20, Fe2Cu and Cu50Zn 50.
Preferably, the step (4) is characterized in that the gas is introduced by introducing hydrogen into the sintering furnace when the temperature is lower than 400 ℃, and keeping the temperature for 90-110 minutes when the temperature reaches 400 ℃; and (4) continuing to heat up to 800 ℃, starting to introduce argon, continuing to heat up to the sintering temperature, and keeping the sintering temperature for 80-100 minutes.
Preferably, the sintering temperature of each copper alloy powder is different.
Preferably, the rate of introduction of hydrogen in step (4) is from 15 to 25 liters/min.
Preferably, in the step (4), the argon gas is introduced at a rate of 5 to 15 liters/minute, and the pressure in the furnace is maintained at 18 to 22 Kpa.
Compared with the prior art, the sintering method of the injection molding copper-based part has the advantages that:
1. the hydrogen is introduced into the low-temperature section, so that the reaction of the hydrogen and the graphite contained in the sintering furnace is avoided, the degreasing is more complete, and meanwhile, the metal oxide is reduced to a certain extent, so that the oxygen content of the particles of the copper alloy powder is reduced, the activity is increased, the sintering is facilitated, the density of the obtained sintered product is high, and the performance is greatly improved.
2. Argon is introduced into the high-temperature section for partial pressure sintering, so that the volatilization of alloy components in the copper alloy powder is avoided, and the pollution to a sintering furnace and the change of material components are avoided.
3. By adopting the method, experiments prove that the sintering density of the product reaches more than 96 percent of the corresponding theoretical density of the copper alloy, and the dimensional precision of the product reaches less than +/-0.2 percent.
Detailed Description
The present invention will be described in further detail with reference to specific examples for the purpose of facilitating understanding by those skilled in the art.
The first embodiment is as follows:
a method of sintering an injection molded copper-based component, comprising the steps of:
(1) selecting copper alloy powder and a binder, and preparing the copper alloy powder and the binder into a feed according to a preset volume ratio. In order to obtain a sintered blank with better performance, the selected copper alloy powder is one or more of CuZn10, CuZn30, Cu80Zn20, Fe2Cu and Cu50Zn50, the selected binder is paraffin base, and the preset volume ratio is 58: 42.
(2) The feedstock is placed on an injection machine and formed into an injection blank, and a portion of the binder is removed from the injection blank by an organic solvent to form a degreased blank. And extracting a part of the binder in the injection blank by using an organic solvent, so that the subsequent steps can be conveniently carried out.
(3) And placing the degreased blank in a sintering furnace and gradually heating.
(4) Introducing gas, degreasing at low temperature, sintering at high temperature, and making into sintered blank. When the temperature is lower than 400 ℃, hydrogen is introduced into the sintering furnace at a rate of 15 liters/minute, and when the temperature reaches 400 ℃, the temperature is maintained for 110 minutes. And (4) continuing to heat, starting to introduce argon after the temperature reaches 800 ℃, and checking whether the hydrogen in the sintering furnace is completely discharged or not by a method of igniting the discharged hydrogen. Argon gas is introduced until the ignited fire is extinguished, and at the moment, the hydrogen in the sintering furnace is completely discharged. And introducing argon at the rate of 5 liters/min, continuously heating, keeping the temperature for 100 minutes after the temperature reaches the sintering temperature, and keeping the pressure in the furnace at 22Kpa during the period of introducing the argon. The sintering temperature differs for each copper alloy powder, and therefore the time to raise the temperature to the sintering temperature also differs.
After the steps are finished, a sintered blank can be obtained, and then necessary subsequent treatment is carried out according to the requirements of different products, so that a finished product can be obtained.
Example two:
a method of sintering an injection molded copper-based component, comprising the steps of:
(1) selecting copper alloy powder and a binder, and preparing the copper alloy powder and the binder into a feed according to a preset volume ratio. In order to obtain a sintered blank with better performance, the selected copper alloy powder is one or more of CuZn10, CuZn30, Cu80Zn20, Fe2Cu and Cu50Zn50, the selected binder is paraffin base, and the preset volume ratio is 58: 42.
(2) The feedstock is placed on an injection machine and formed into an injection blank, and a portion of the binder is removed from the injection blank by an organic solvent to form a degreased blank. And extracting a part of the binder in the injection blank by using an organic solvent, so that the subsequent steps can be conveniently carried out.
(3) And placing the degreased blank in a sintering furnace and gradually heating.
(4) Introducing gas, degreasing at low temperature, sintering at high temperature, and making into sintered blank. Hydrogen was introduced into the sintering furnace at a rate of 25 liters/min when the temperature was below 400 ℃ and maintained at this temperature for 90 minutes when the temperature reached 400 ℃. And (4) continuing to heat, starting to introduce argon after the temperature reaches 800 ℃, and checking whether the hydrogen in the sintering furnace is completely discharged or not by a method of igniting the discharged hydrogen. Argon gas is introduced until the ignited fire is extinguished, and at the moment, the hydrogen in the sintering furnace is completely discharged. The argon gas is introduced at a rate of 15 liters/minute, the temperature is continuously increased, the temperature is kept for 80 minutes after the temperature reaches the sintering temperature, and the pressure in the furnace is kept at 18Kpa during the period of introducing the argon gas. The sintering temperature differs for each copper alloy powder, and therefore the time to raise the temperature to the sintering temperature also differs.
After the steps are finished, a sintered blank can be obtained, and then necessary subsequent treatment is carried out according to the requirements of different products, so that a finished product can be obtained.
In conclusion, the oxygen content of the powder particles is reduced, the activity is increased, the sintering is facilitated, the density of the obtained sintered product is high, and the performance is greatly improved.
Argon is introduced into the high-temperature section for partial pressure sintering, so that the volatilization of alloy components in the copper alloy powder is avoided, and the pollution to a sintering furnace and the change of material components are avoided.
Experiments prove that the sintering density of the product reaches over 96 percent of the theoretical density of the corresponding copper alloy and the dimensional precision of the product reaches less than +/-0.2 percent in the whole production period of 22 hours.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A method of sintering an injection molded copper-based component, comprising the steps of:
(1) selecting copper alloy powder and a binder, and preparing the copper alloy powder and the binder into a feed according to a preset volume ratio;
(2) placing the feed on a copper alloy powder injection machine to form an injection blank, and removing part of the binder from the injection blank through an organic solvent to form a degreased blank;
(3) placing the degreased blank in a sintering furnace and gradually heating;
(4) introducing gas, degreasing at low temperature, sintering at high temperature to prepare a sintered blank, wherein hydrogen is introduced when the temperature is lower than 400 ℃, and the temperature is kept for 90-110 minutes when the temperature reaches 400 ℃; and (3) continuing to heat up, starting to introduce argon after the temperature reaches 800 ℃, igniting the discharged hydrogen, checking whether the hydrogen in the sintering furnace is completely discharged, continuing to heat up to the sintering temperature, and keeping the sintering temperature for 80-100 minutes.
2. The sintering method of an injection-molded copper-based part according to claim 1, wherein the binder in the step (1) is paraffin-based.
3. The sintering method for an injection-molded copper-based part according to claim 1, wherein the sintering temperature differs for each copper alloy powder.
4. The sintering method for an injection-molded copper-based part according to claim 3, wherein the rate of introducing hydrogen gas in the step (4) is 15 to 25 liters/minute.
5. The sintering method for an injection-molded copper-based part according to claim 4, wherein the argon gas is introduced at a rate of 5 to 15 liters/minute in the step (4) and the pressure in the furnace is maintained at 18 to 22 KPa.
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| CN201710239559.3A CN106884106B (en) | 2017-04-13 | 2017-04-13 | Sintering method of injection-molded copper-based part |
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| CN201710239559.3A CN106884106B (en) | 2017-04-13 | 2017-04-13 | Sintering method of injection-molded copper-based part |
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| CN106884106B true CN106884106B (en) | 2021-08-27 |
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| DE102017118386A1 (en) * | 2017-08-11 | 2019-02-14 | Grohe Ag | Copper alloy, use of a copper alloy, sanitary fitting and method of making a sanitary fitting |
| CN113695574B (en) * | 2020-07-07 | 2024-03-29 | 南京泉峰汽车精密技术股份有限公司 | Motor coil and preparation method thereof |
| CN113136498B (en) * | 2021-04-28 | 2022-05-27 | 深圳市注成科技股份有限公司 | Brass MIM process preparation method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774020A (en) * | 2010-01-20 | 2010-07-14 | 中南大学 | Method for preparing molybdenum-copper component |
| CN106552942A (en) * | 2017-02-06 | 2017-04-05 | 深圳市卡德姆科技有限公司 | A kind of method of the modeling based binder and injection moulding copper and copper alloy parts for copper and copper alloy injection moulding |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774020A (en) * | 2010-01-20 | 2010-07-14 | 中南大学 | Method for preparing molybdenum-copper component |
| CN106552942A (en) * | 2017-02-06 | 2017-04-05 | 深圳市卡德姆科技有限公司 | A kind of method of the modeling based binder and injection moulding copper and copper alloy parts for copper and copper alloy injection moulding |
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