CN105251998A - Sintering method for controlling carbon and oxygen content of powder metallurgy products - Google Patents
Sintering method for controlling carbon and oxygen content of powder metallurgy products Download PDFInfo
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- CN105251998A CN105251998A CN201510740668.4A CN201510740668A CN105251998A CN 105251998 A CN105251998 A CN 105251998A CN 201510740668 A CN201510740668 A CN 201510740668A CN 105251998 A CN105251998 A CN 105251998A
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Abstract
The invention relates to the technical field of powder metallurgy, and particularly discloses a sintering method for controlling the carbon and oxygen content of powder metallurgy products. According to the method, products to be sintered are placed in a closed system to be sintered in the sintering process, wherein the closed system is formed by metal plates in a defined manner, and the metal plates can absorb oxygen. By means of the method, the carbon and oxygen content of the final products is greatly reduced, it is ensured that the products have good comprehensive mechanical properties, and great economic benefits are brought to industrial production.
Description
Technical field
The present invention relates to powder metallurgical technology, be specifically related to a kind of sintering method controlling sintered metal product carbon oxygen content.
Background technology
Powder metallurgy uses the mixed-powder of metal dust or metal dust and non-metal powder as raw material, produces the industrial technology of metal material, composite and all kinds goods through shaping and sintering process.PM technique has been widely used in the every field of national economy.It is a kind of " green " manufacturing technology, can be once-forming according to the net shape of product, thus avoid raw-material waste.It " green " be also embodied in when preparing some refractory metals or alloy and at lower temperature thermal sintering, the consumption of the energy can be saved.When preparing complex-shaped goods, PM technique especially has superiority, and cost is low far beyond traditional diamond-making techniques such as machinings, and goods still can keep good mechanical property, so be more and more subject to the favor of more areas.
PM technique, according to the difference of its shaping means, can be divided into common die forming, powder injection forming or powder rolling shaping etc.Regardless of which kind of manufacturing process, end article has to pass through sintering circuit just can obtain required product.The sintering of powder is a complicated physical and chemical process, and powder particle forms metallurgical binding among this process, thus makes goods obtain necessary mechanical property.Analyze from technique, sintering is a system engineering, and sintering furnace, goods and sintering atmosphere together constitute the principal element of sintering.The heating rate of sintering furnace, sintering temperature and sintering time, the distribution in temperature field in furnace and atmosphere flow field, the putting of goods, setting material and the selection of sintering filler, the flow velocity and purity etc. of atmosphere can impact sintering result.For metal powder metallurgy goods of the prior art, green compact after shaping have huge surface energy, the oxygen carbon be easy in system is combined, form stable oxide or carbide, goods carbon oxygen content is caused to increase, these oxygen and carbon or stay in crystal grain in the mode of gap solid solution or remain between crystal boundary in the mode of compound, cause very large impact to the performance of goods.Normally increase the intensity of goods, but sharply reduce the ductility of goods, make final products can't bear to use.
Summary of the invention
The technical problem to be solved in the present invention is, in order to solve, final products oxygen and carbon content in metal powder metallurgy technique is too high causes product mechanics degradation, affect this technical barrier of use of product, a kind of sintering method controlling sintered metal product carbon oxygen content is provided.
Above-mentioned technical problem to be solved by this invention is achieved by the following technical programs:
Control a sintering method for sintered metal product carbon oxygen content, goods to be sintered are put in by sintering in the closed system that surrounds of the metallic plate of oxygen uptake in sintering process.
The present invention utilizes and can the metallic plate of oxygen uptake and the high-affinity of oxygen oxygen preferentially be absorbed by oxidizable metallic plate, in addition, the closed system that surrounds of the metallic plate of oxygen uptake can deaden carbon and spread to goods, thus greatly reduce the carbon oxygen content of final products, ensure that product has good comprehensive mechanical property.This invention effectively can also improve the sintering yields of mechanical property to carbon oxygen content sensitive metal goods, brings huge economic benefit to industrial production.
Preferably, described can the metallic plate of oxygen uptake be titanium plate.Inventor, by a large amount of experiments, finds to use titanium plate greatly can reduce the oxygen and carbon content of final products, ensures that product has good comprehensive mechanical property.
More preferably, in sintering process, goods to be sintered are put and sinter in the titanium box surrounded by titanium plate.
Preferably, adherent layer is set at the contact surface of sintered article and metallic plate.
More preferably, the described method arranging adherent layer is: spread one deck ceramic powders on a metal plate or spread one piece of ceramic wafer on a metal plate.
Preferably, to make a circle ceramic powders or titanium valve in closed system surrounding, can effectively absorb or prevent due to stove vacuum not or the trace oxygen of the impure generation of atmosphere of ventilating or other foreign gas be incorporated in product.
Preferably, described method specifically comprises following steps:
S1. goods prepare: use the required goods of powder metallurgical technique preparation;
S2. pretreatment before sintering: remain in the binding agent in green compact during Material removal;
S3. sinter: goods to be sintered are put in sintering in the closed system that surrounds of the metallic plate of oxygen uptake.
More preferably, described powder metallurgical technique is common die forming technique, powder injection forming or powder rolling process.
Beneficial effect: the sintering method that the invention provides a kind of control sintered metal product carbon oxygen content completely newly, goods to be sintered are put in sintering in the closed system that surrounds of the metallic plate of oxygen uptake by described method first.Shown that by the experimental result in embodiment the product prepared under such an approach reduces the carbon oxygen content of final products greatly, ensure that product has good comprehensive mechanical property, bring huge economic benefit to industrial production.
Accompanying drawing explanation
Fig. 1 is the sintering method schematic diagram controlling sintered metal product carbon oxygen content.
Fig. 2 is sintering temperature process curve figure.
Detailed description of the invention
Explain the present invention further below in conjunction with specific embodiment, but embodiment does not limit in any form to the present invention.
In the embodiment of the present invention, the method for testing of product relative density is see MetalPowderIndustriesFederation (MPIF) Standard42.
In the embodiment of the present invention, the method for testing of tensile strength is see MetalPowderIndustries
Federation(MPIF)Standard50。
In the embodiment of the present invention, the method for testing of percentage elongation is see MetalPowderIndustriesFederation (MPIF) Standard59.
In the embodiment of the present invention, oxygen content method of testing is see ASTME1019-11.
In the embodiment of the present invention, carbon content method of testing is see ASTME1019-11.
Embodiment 1 powder injection forming CP-Ti part controls the sintering process of carbon oxygen content
The present embodiment adopts metal injection moulding method to prepare part, and raw material is CP-Ti feeding (containing titanium metal powder, paraffin, polyolefin and stearic acid etc.).The method specifically comprises the steps:
(1) goods prepare: CP-Ti feeding by injector screw rod mixing, plasticizing and metering be accurately expelled in goods mould, injection temperature 170 DEG C, injection pressure 110MPa, mold temperature 110 DEG C, obtains the green compact of goods;
(2) pretreatment before sintering: processed by the goods green compact that step (1) obtains, removes assist formation composition wherein.First by goods bubble in n-hexane 24 hours, most of paraffin is fallen in extraction, then adds polyolefin in heat abstraction goods and stearic acid etc. at low temperatures;
(3) sinter: step (2) pretreated goods are placed in the titanium box surrounded by titanium plate, sinter according to heating curve as shown in Figure 2, after sintering, obtain oxygen content 2275ppm, the final products of carbon content 508ppm, tensile strength 540Mpa, percentage elongation 12%, relative density 95.4%.
Comparative example 1: the sintering process that powder injection forming CP-Ti part is protected without titanium box
The present embodiment adopts metal injection moulding method to prepare part, and raw material is CP-Ti feeding (containing titanium metal powder, paraffin, polyolefin and stearic acid etc.).The method specifically comprises the steps:
(1) goods prepare: CP-Ti feeding by injector screw rod mixing, plasticizing and metering be accurately expelled in goods mould, injection temperature 170 DEG C, injection pressure 110MPa, mold temperature 110 DEG C, obtains the green compact of goods;
(2) pretreatment before sintering: processed by the goods green compact that step (1) obtains, removes assist formation composition wherein.First by goods bubble in n-hexane 24 hours, most of paraffin is fallen in extraction, then adds polyolefin in heat abstraction goods and stearic acid etc. at low temperatures;
(3) sinter: pretreated for step goods are placed in and sinter according to heating curve as shown in Figure 2; the protection of titanium box is not carried out in its sintering process; after sintering; obtaining CP-Ti goods oxygen content is 5128ppm; the final products of carbon content 780ppm; tensile strength 500Mpa, percentage elongation 0%, relative density 94.9%.
As can be seen from embodiment 1 and comparative example 1, the carbon oxygen content not having titanium box to protect is protected apparently higher than there being titanium box, do not have titanium box to protect due to carbon oxygen content too high, cause the final performance of goods to decline rapidly, substantially there is no percentage elongation, occur brittle failure.Can find out, the protection of titanium box effectively can improve final sintered article performance.
Claims (8)
1. control a sintering method for sintered metal product carbon oxygen content, it is characterized in that, goods to be sintered are put in by sintering in the closed system that surrounds of the metallic plate of oxygen uptake in sintering process.
2. sintering method according to claim 1, is characterized in that, described can the metallic plate of oxygen uptake be titanium plate.
3. sintering method according to claim 1, is characterized in that, is put by goods to be sintered and sinter in the titanium box surrounded by titanium plate in sintering process.
4. sintering method according to claim 1, is characterized in that, arranges adherent layer at the contact surface of sintered article and metallic plate.
5. method according to claim 4, is characterized in that, the described method arranging adherent layer is: spread one deck ceramic powders on a metal plate or spread one piece of ceramic wafer on a metal plate.
6. sintering method according to claim 1, is characterized in that, to make a circle ceramic powders or titanium valve in closed system surrounding.
7. sintering method according to claim 1, is characterized in that, described method specifically comprises following steps:
S1. goods prepare: use the required goods of powder metallurgical technique preparation;
S2. pretreatment before sintering: remain in the binding agent in green compact during Material removal;
S3. sinter: goods to be sintered are put in sintering in the closed system that surrounds of the metallic plate of oxygen uptake.
8. sintering method according to claim 7: it is characterized in that, described powder metallurgical technique is common die forming technique, powder injection forming or powder rolling process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510740668.4A CN105251998A (en) | 2015-11-04 | 2015-11-04 | Sintering method for controlling carbon and oxygen content of powder metallurgy products |
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| CN201510740668.4A CN105251998A (en) | 2015-11-04 | 2015-11-04 | Sintering method for controlling carbon and oxygen content of powder metallurgy products |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107498056A (en) * | 2017-07-31 | 2017-12-22 | 昆山米泰克精密电子组件有限公司 | A kind of Kato production technology |
| CN110267152A (en) * | 2019-05-08 | 2019-09-20 | 歌尔股份有限公司 | A kind of sounding device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0339402A (en) * | 1989-07-07 | 1991-02-20 | Mitsubishi Heavy Ind Ltd | Manufacture of metal powder sintered body |
| JP2002348601A (en) * | 2001-05-21 | 2002-12-04 | Tsurumi Soda Co Ltd | Powder metallurgy method, and sintered metallic compact |
| CN101594954A (en) * | 2006-08-07 | 2009-12-02 | 昆士兰大学 | Metal injection moulding method |
| CN102962450A (en) * | 2012-12-12 | 2013-03-13 | 广汉川冶新材料有限责任公司 | Vacuum sintering method used in powder metallurgy process |
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2015
- 2015-11-04 CN CN201510740668.4A patent/CN105251998A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0339402A (en) * | 1989-07-07 | 1991-02-20 | Mitsubishi Heavy Ind Ltd | Manufacture of metal powder sintered body |
| JP2002348601A (en) * | 2001-05-21 | 2002-12-04 | Tsurumi Soda Co Ltd | Powder metallurgy method, and sintered metallic compact |
| CN101594954A (en) * | 2006-08-07 | 2009-12-02 | 昆士兰大学 | Metal injection moulding method |
| CN102962450A (en) * | 2012-12-12 | 2013-03-13 | 广汉川冶新材料有限责任公司 | Vacuum sintering method used in powder metallurgy process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107498056A (en) * | 2017-07-31 | 2017-12-22 | 昆山米泰克精密电子组件有限公司 | A kind of Kato production technology |
| CN110267152A (en) * | 2019-05-08 | 2019-09-20 | 歌尔股份有限公司 | A kind of sounding device |
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Application publication date: 20160120 |