CN113136498A - Brass MIM process preparation method - Google Patents

Brass MIM process preparation method Download PDF

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Publication number
CN113136498A
CN113136498A CN202110470824.5A CN202110470824A CN113136498A CN 113136498 A CN113136498 A CN 113136498A CN 202110470824 A CN202110470824 A CN 202110470824A CN 113136498 A CN113136498 A CN 113136498A
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China
Prior art keywords
mim
blank
brass
sintering
ball
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CN202110470824.5A
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Chinese (zh)
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CN113136498B (en
Inventor
叶典舞
李善太
吕明勇
周永贵
袁小燕
刘浩鹏
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Shenzhen Pim Technology Co ltd
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Shenzhen Pim Technology Co ltd
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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
    • 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
    • B22F1/14—Treatment of metallic powder
    • B22F1/142—Thermal or thermo-mechanical treatment
    • 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
    • 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
    • B22F3/1021—Removal of binder or filler
    • B22F3/1025—Removal of binder or filler not by heating 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
    • 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
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Powder Metallurgy (AREA)

Abstract

The invention is suitable for the field of brass powder metallurgy, and provides a brass MIM process preparation method, which comprises the following steps: adding P element into H59-1 pre-alloyed spray brass powder, and activating and sintering the ingredients; ball-milling the brass powder after burdening uniformly; sieving the ball-milled materials to obtain evenly-mixed H59-1 brass powder, adding an MIM forming agent, mixing evenly, and crushing into a feed suitable for MIM forming; injection molding the feed to obtain a blank, heating and extracting the blank by using an organic solvent, and drying the blank; loading the blank into a sealable boat for sintering; and re-pressing the sintered blank to further improve the material density to obtain the required material product. By utilizing the powder metallurgy MIM process preparation method, the H59-1 brass material with high relative density and qualified performance is prepared, and the wide prospect is avoided on the near-forming technology of complex parts in the industrial field.

Description

Brass MIM process preparation method
Technical Field
The invention belongs to the field of brass powder metallurgy, and particularly relates to a brass MIM process preparation method.
Background
Among the powder metallurgy production techniques, the production of brass parts is the most difficult. Because the brass has a high proportion of low-melting-point components, the components of the final sintered product are easy to melt, precipitate and evaporate in the sintering process, so that the components of the final sintered product are changed or segregated, and the material with qualified performance is difficult to manufacture. For H59-1 brass: wherein the zinc content reaches 40-41%. While the melting point of zinc is 419.5 c and the vaporization point is 907 c. Because the zinc component content of low melting point and low vaporization point is very high, the H59-1 brass powder compact is very easy to produce component change or segregation during sintering, so that it is difficult to prepare material with qualified performance. The prior MIM process can not prepare the H59-1 brass material with better performance, and meets the process requirement characteristics, so a brass MIM process preparation method is needed to prepare the H59-1 brass material which meets the metallurgical process requirement characteristics of the H59-1 brass powder, has high relative density and qualified performance, and has wide prospect in the near-forming technology of complex parts in the industrial field.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of brass MIM (metal-insulator-metal) process, and aims to solve the problem that H59-1 brass cannot be prepared by the existing MIM process and meets the requirement characteristics of the powder metallurgy process.
The invention is realized in such a way that a brass MIM process preparation method comprises the following steps:
adding P element into H59-1 pre-alloyed spray brass powder, and activating and sintering the ingredients;
uniformly ball-milling the brass powder after proportioning: the method comprises the following steps of carrying out ball milling and mixing on the brass powder after burdening in a rolling ball mill: ball material ratio 2: 1, mixing for 12-20h, and ball milling at a rotating speed of 42 r/min.
Adding MIM forming agent into the mixture, mixing uniformly, and crushing into feed suitable for MIM forming: the special MIM forming agent is a plastic forming agent, and the mass fraction of the added MIM forming agent is 7.5-8.3%.
Injection molding the feed to obtain a blank, heating and extracting the blank by using an organic solvent, and drying the blank: the method is characterized in that organic solvent is heated and extracted to ensure that the removal amount of the forming agent is more than 50 percent so as to dry the blank to be fired.
Loading the blank into a sealable boat for sintering;
and (3) re-pressing the sintered blank to further improve the material density to obtain the required material product: the sintering temperature is 880 ℃ and the sintering time is 150min by adopting a degreasing and sintering integrated process. Further, the step of placing the blank into a sealable boat for sintering comprises the steps of placing the blank into a sealable metal boat, sealing the metal boat and placing the metal boat into a furnace, placing the metal boat containing a certain amount of zinc powder in front and back of the metal boat, increasing the vapor pressure of zinc in the furnace at high temperature, placing the metal boat into a sintering furnace with ammonia decomposition protective atmosphere, and performing degreasing sintering.
Compared with the prior art, the invention has the beneficial effects that:
the embodiment of the invention provides a preparation method of a brass MIM process, which comprises the following steps: adding P element into H59-1 pre-alloyed spray brass powder, and activating and sintering the ingredients; ball-milling the brass powder after burdening uniformly; sieving the ball-milled materials to obtain evenly-mixed H59-1 brass powder, adding an MIM forming agent, mixing evenly, and crushing into a feed suitable for MIM forming; injection molding the feed to obtain a blank, heating and extracting the blank by using an organic solvent, and drying the blank; loading the blank into a sealable boat for sintering; and re-pressing the sintered blank to further improve the material density to obtain the required material product. By utilizing the powder metallurgy MIM process preparation method, the H59-1 brass material with high relative density and qualified performance is prepared, and the wide prospect is avoided on the near-forming technology of complex parts in the industrial field.
Drawings
Fig. 1 is a schematic flow chart of a preparation method of a brass MIM process according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a brass MIM process preparation method. Please refer to fig. 1, which includes:
s101, adding P element powder into H59-1 pre-alloyed spray brass powder, wherein the mass fraction of the P element powder is 0.2-0.3%, and performing activated sintering; specifically, H59-1 prealloyed spray brass powder was mixed with a small amount of P element to activate the sintering batch and ball milled in a rolling ball mill.
S102, screening the ball-milled materials to obtain uniformly mixed H59-1, and performing activated sintering to obtain fine and uniformly mixed H59-1 powder;
s103, carrying out ball milling and mixing on the brass powder after burdening in a rolling ball mill:
ball material ratio 2: 1, mixing for 12-20h, and ball milling at a rotating speed of 42 r/min. (ii) a
S104, adding an MIM forming agent into the brass mixture, uniformly mixing, and crushing into a feed suitable for MIM forming;
s105, injection molding the feed to obtain a blank, heating and extracting the blank by using an organic solvent, and drying the blank;
s106, placing the blank into a sealable boat for sintering;
and S107, re-pressing the sintered blank to further improve the material density to obtain the required material product.
The H59-1 brass material with high relative density and qualified performance is obtained through the steps, the material density is 7.8110-7.9589-g/cm3, and the relative density can reach 94.6-95.6%.
And re-pressing the sintered blank to further improve the material density, and preparing the H59-1 material product with the relative density of more than 96% and the hardness of HV0.1O of 110. The powder metallurgy MIM process is well utilized to prepare the H59-1 brass material with high relative density and qualified performance.
The boat containing zinc powder is added in the sintering process, so that the vapor pressure of zinc in the furnace atmosphere is improved, and the melting, separation and evaporation changes of zinc components in H59-1 brass are effectively prevented. The research shows that the components of the powder metallurgy H59-1 brass material prepared by the method are hardly changed, and the physical and mechanical properties of the material are close to the requirements of GB4423-1992 standard.
In particular, the qualified powder metallurgy H59-1 brass fittings can be manufactured by adopting the method, and the method has wide prospect for the near forming of complex parts in the industrial field.
The method also comprises the following subdivision steps:
further, the yellow copper powder after being mixed is subjected to ball milling mixing in a rolling ball mill: ball material ratio 2: 1, mixing for 12-20h, and ball milling at a rotating speed of 42 r/min.
Further, heating and extracting by using an organic solvent to ensure that the removal amount of the forming agent is more than 50 percent so as to dry the blank to be fired.
Further, the sintering temperature is 880 ℃ and the sintering time is 150min by adopting the integrated degreasing and sintering process.
Further, the special MIM molding agent is a plastic molding agent.
Further, the step of placing the blank into a sealable boat for sintering comprises the steps of placing the blank into a sealable metal boat, sealing the metal boat and placing the metal boat into a furnace, placing the metal boat containing a certain amount of zinc powder in front and back of the metal boat, increasing the vapor pressure of zinc in the furnace at high temperature, placing the metal boat into a sintering furnace with ammonia decomposition protective atmosphere, and performing degreasing sintering.
Further, the mass fraction of the MIM forming agent in the adding and mixing process is 7.5-8.3%;
compared with the prior art, the invention has the beneficial effects that: the embodiment of the invention provides a preparation method of a brass MIM process, which comprises the following steps: adding P element into H59-1 pre-alloyed spray brass powder, and activating and sintering; ball-milling the brass powder after burdening uniformly; sieving the ball-milled materials to obtain evenly-mixed H59-1 brass powder, adding an MIM forming agent, mixing evenly, and crushing into a feed suitable for MIM forming; injection molding the feed to obtain a blank, heating and extracting the blank by using an organic solvent, and drying the blank; loading the blank into a sealable boat for sintering; and re-pressing the sintered blank to further improve the material density to obtain the required material product. By utilizing the powder metallurgy MIM process preparation method, the H59-1 brass material with high relative density and qualified performance is prepared, and the wide prospect is avoided on the near-forming technology of complex parts in the industrial field.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (7)

1. A brass MIM process preparation method is characterized by comprising the following steps:
adding P element into H59-1 pre-alloyed spray brass powder, and activating and sintering the ingredients;
ball-milling the brass powder after burdening uniformly;
sieving the ball-milled materials to obtain evenly-mixed H59-1 brass powder, adding an MIM forming agent, mixing evenly, and crushing into a feed suitable for MIM forming;
injection molding the feed to obtain a blank, heating and extracting the blank by using an organic solvent, and drying the blank;
loading the blank into a sealable boat for sintering;
and re-pressing the sintered blank to further improve the material density to obtain the required material product.
2. The preparation method of the MIM process according to claim 1, characterized in that the brass powder after dosing is ball milled and mixed in a rolling ball mill:
ball material ratio 2: 1, mixing for 12-20h, and ball milling at a rotating speed of 42 r/min.
3. The MIM process according to claim 1 wherein the organic solvent is heated and extracted to remove the forming agent by more than 50% and the blank is oven dried.
4. The MIM process preparation method according to claim 1, characterized in that,
the sintering temperature is 880 ℃ and the sintering time is 150min by adopting a degreasing and sintering integrated process.
5. The method of claim 1, wherein the MIM specific molding agent is a plastic molding agent.
6. The process of claim 1, wherein the sintering of the green part in a sealable boat comprises loading the green part in a sealable metal boat, covering the metal boat in a furnace, placing the boat with a quantity of zinc powder in front and back, increasing the vapor pressure of zinc in the furnace at high temperature, placing the boat in a sintering furnace with ammonia decomposition atmosphere, and performing degreasing sintering.
7. The preparation method of the MIM process of claim 1, wherein the mass fraction of the MIM forming agent in the adding and mixing process of the MIM forming agent is 7.5%.
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2506334A1 (en) * 1981-05-21 1982-11-26 Champagne Ardennes Affinage Two=phase foundry brass alloy - contg. arsenic to improve dezincification resistance and castability
CN1055770A (en) * 1991-04-29 1991-10-30 南通有色铸造厂 The fining process of low brass
CN101638735A (en) * 2008-08-01 2010-02-03 重庆华浩冶炼有限公司 Brass composite powder and preparation method thereof
CN102477496A (en) * 2010-11-27 2012-05-30 湖南特力新材料有限公司 Method for preparing unleaded free-cutting brass
CN106884106A (en) * 2017-04-13 2017-06-23 惠州威博精密科技有限公司 A kind of sintering method of injection molding copper-based parts
CN206887198U (en) * 2017-04-25 2018-01-16 新疆大学 One Albatra metal temperature control pressure regulation smelting apparatus
CN111587297A (en) * 2018-01-29 2020-08-25 保来得株式会社 Sintered bearing and method for manufacturing sintered bearing

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2506334A1 (en) * 1981-05-21 1982-11-26 Champagne Ardennes Affinage Two=phase foundry brass alloy - contg. arsenic to improve dezincification resistance and castability
CN1055770A (en) * 1991-04-29 1991-10-30 南通有色铸造厂 The fining process of low brass
CN101638735A (en) * 2008-08-01 2010-02-03 重庆华浩冶炼有限公司 Brass composite powder and preparation method thereof
CN102477496A (en) * 2010-11-27 2012-05-30 湖南特力新材料有限公司 Method for preparing unleaded free-cutting brass
CN106884106A (en) * 2017-04-13 2017-06-23 惠州威博精密科技有限公司 A kind of sintering method of injection molding copper-based parts
CN206887198U (en) * 2017-04-25 2018-01-16 新疆大学 One Albatra metal temperature control pressure regulation smelting apparatus
CN111587297A (en) * 2018-01-29 2020-08-25 保来得株式会社 Sintered bearing and method for manufacturing sintered bearing

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
邓一兵: "《物理学前沿与高新技术》", 30 June 2006, 杭州：浙江科学技术出版社 *

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