CN106552942A - A kind of method of the modeling based binder and injection moulding copper and copper alloy parts for copper and copper alloy injection moulding - Google Patents
A kind of method of the modeling based binder and injection moulding copper and copper alloy parts for copper and copper alloy injection moulding Download PDFInfo
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- CN106552942A CN106552942A CN201710065817.0A CN201710065817A CN106552942A CN 106552942 A CN106552942 A CN 106552942A CN 201710065817 A CN201710065817 A CN 201710065817A CN 106552942 A CN106552942 A CN 106552942A
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- based binder
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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
- B22F3/22—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
- 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
- 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
- B22F1/103—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent
-
- 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
Abstract
The invention discloses a kind of modeling based binder for copper and copper alloy injection moulding, the modeling based binder is by obtained from polyformaldehyde POM, high density polyethylene, ethylene-vinyl acetate copolymer EVA, stearic acid SA and antioxidant are blended according to certain ratio.The invention discloses the method using based binder injection moulding copper and copper alloy parts are moulded, including：Prepare modeling based binder；Mixing, pelletize；Injection moulding；Oxalic acid catalyst defat, thermal debinding and sintering.The modeling based binder injection moulding copper provided using the present invention and its copper alloy parts, it is possible to increase defat efficiency, reduce production cost, it is adaptable to prepare high-accuracy, baroque copper and its alloyed components.
Description
Technical field
The present invention relates to copper and its copper alloy parts processing technique field, it is more particularly related to one kind is used for
The modeling based binder and injection moulding high-performance of copper and copper alloy injection moulding, high dimensional accuracy, baroque copper and copper
The method of alloy part.
Background technology
Copper is and at present one of most widely used metal earliest by the wide variety of metal of the mankind.Due to copper alloy
It is widely used in friction material, contains with a series of premium properties such as high electrical conductivity and thermal conductivity, corrosion resistance be strong
Oil bearing, electrical contact and other conductive materials, component of machine etc., play in industries such as automobile, household electrical appliances, electronic communications and weigh very much
The effect wanted.
The method that copper and its alloyed components are prepared currently with injection molding process is mainly based upon the binding agent of cerul
System.For example：The Chinese invention patent of Publication No. CN1994627A, discloses a kind of cerul with paraffin PW as main skeleton
Adhesive system.Which passes through the main skeleton that paraffin PW+ polystyrene PS constitute the adhesive system, then in degreasing process
Once gone out the paraffin PW and polystyrene PS of adhesive system using the process route of solvent degreasing+thermal debinding, finally by
Sintering further realizes the injection moulding of CuSn10.But solvent degreasing process has the disadvantage that：The long efficiency of degreasing time is low, defat
Environmental requirement is strict, degreasing solvent preserves that cost is high, equipment is huge, solvent garbage is produced after defat, and not disposable, defat is produced
Product are yielding etc., so as to affect the overall performance of product.
The content of the invention
It is an object of the invention to solve at least the above, and provide the advantage that at least will be described later.
It is a still further object of the present invention to provide a kind of modeling based binder for copper and copper alloy injection moulding, the modeling
Based binder is conducive to the defat after copper and copper alloy parts injection moulding, and degreasing time is short, efficiency high, defat completely,
Product cost is reduced into, product stability is improved during ensure that injection moulding, is produced without defects such as cracking, bulges, is had
Beneficial to the high copper alloy element of production complex structure, required precision.
It is a still further object of the present invention to provide a kind of method of injection moulding copper and copper alloy parts, the method is used
Modeling based binder, improves that the defat efficiency using wax-based binder is low, occupation area of equipment is big, produce garbage is difficult place
After reason, defat the shortcomings of product changeableness, by polyformaldehyde POM to be substituted paraffin PW as main binding agent skeleton, the initial stage takes off
Fat causes defatting step controllable, quick using the chemical reaction that Catalyzed by Oxalic Acid polyformaldehyde POM decomposes, and takes off so as to solve conventional solvent
The defect of fat, optimizes degreasing process.
To achieve these goals, the invention provides a kind of modeling based binder for copper and copper alloy injection moulding,
The modeling based binder by polyformaldehyde POM, high density polyethylene, ethylene-vinyl acetate copolymer EVA, stearic acid SA and
Obtained from antioxidant is blended according to certain ratio.
Preferably, in the described modeling based binder for copper and copper alloy injection moulding, it is described modeling based binder with
Mass percent meter includes：Polyformaldehyde POM 70%～95%, high density polyethylene 0.5%～10%, ethyl vinyl acetate
Ethylene copolymer EVA 0.2%～10%, stearic acid SA 0.2～4% and antioxidant 0.1～5.0%.
The invention also discloses a kind of method using modeling based binder injection moulding copper and copper alloy parts, including it is following
Step：
S1. prepare modeling based binder：By polyformaldehyde POM, high density polyethylene, ethylene-vinyl acetate copolymer
EVA, stearic acid SA and antioxidant are blended according to certain ratio, and it is uniform to reach composition；
S2. mixing, pelletize：Fine copper powder or copper alloy powder are added in rubber mixing machine, is subsequently adding a certain proportion of
Modeling based binder, is manufactured into feeding, fine copper powder or copper alloy powder and modeling base by extruding granulator after mixing is uniform again
Binding agent is mixed with the useful load of 56～63vol%；
S3. injection moulding：Injection moulding, the manufacture birth under certain injection temperature and injection pressure by the feeding
Base；
S4. defat：Under catalysis of the oxalic acid for catalyst, the green compact are placed in debinding furnace carries out oxalic acid catalyst defat,
Green compact are then taken out, and thermal debinding are entered in being put into sintering furnace；
S5. sinter：Under the protection of reducing atmosphere or inert atmosphere, the green compact after thermal debinding are carried out in sintering furnace
High temperature sintering, obtains finished product after cooling.
Preferably, the method for described injection moulding copper and copper alloy parts, in the S2, melting temperature be 165～
175 DEG C, mixing time is 0.8～1.8h.
Preferably, the method for described injection moulding copper and copper alloy parts, in the S3, injection temperature be 170～
190 DEG C, injection pressure is 90～120MPa.
Preferably, the method for described injection moulding copper and copper alloy parts, in the S4, oxalic acid catalyst skimming temp
For 85～145 DEG C, oxalic acid catalyst degreasing time is 4～12h.
Preferably, the method for described injection moulding copper and copper alloy parts, in the S4, the temperature of thermal debinding is 30
～600 DEG C, the thermal debinding time is 4～5h.
Preferably, the method for described injection moulding copper and copper alloy parts, in the S5, sintering temperature be 800～
1050 DEG C, sintering time is 2～4h, and sintering atmosphere is cracking ammonia.
Preferably, the method for described injection moulding copper and copper alloy parts, fine copper powder is D90 particle diameters for 400～
The aerosolization of 600 mesh or water atomization fine copper powder, sintering temperature are 900～1050 DEG C.
Preferably, the method for described injection moulding copper and copper alloy parts, it is 400 that copper alloy powder is D90 particle diameters
The aerosolization of～600 mesh or water atomization bronze powder, sintering temperature are 850～960 DEG C.
Preferably, the method copper alloy powder of described injection moulding copper and copper alloy parts is D90 particle diameters for 400～
The aerosolization of 600 mesh or water atomization brass powder, sintering temperature are 800～960 DEG C.
Preferably, the method copper alloy powder of described injection moulding copper and copper alloy parts is D90 particle diameters for 400～
The aerosolization of 600 mesh or water atomization copper-nickel alloy powder, sintering temperature are 800～1050 DEG C.
The present invention at least includes following beneficial effect：
1) defat efficiency high, general defat efficiency are 1mm/H；
2) degreasing equipment is little, little compared with the total floor space of solvent degreasing equipment；
3) completely, defat effective percentage up to more than 90%, product stability height are unlikely to deform for defat；
4) medium is oxalic acid, is easy to preserve compared with the organic combustibles of solvent degreasing；
5) remain without trade waste after the completion of defat, and oxalic acid is low compared with the nitric acid causticity of catalyst defat, preserve
Environment is not so good as harsh as nitric acid and is easy to preserve.Adopt bronze relative density prepared by the method for 96.7%～97.1%, draw
It is 206～229MPa to stretch intensity, and hardness is 56～66HB, and dimension control is within ± 0.3%～0.5%；Fine copper is relative
Density is 96.3～96.9%, and tensile strength is 178～181, and elongation percentage is 21.7%～24.3%, and the coefficient of heat conduction is 326
～345W/ (m DEG C), electric conductivity are 61.2%～72.2%IACS.
Part is embodied by the further advantage of the present invention, target and feature by description below, and part will also be by originally
The research of invention and practice and be understood by the person skilled in the art.
Specific embodiment
With reference to embodiment, the present invention is described in further detail, to make those skilled in the art with reference to description
Word can be implemented according to this.
It should be appreciated that it is used herein such as " have ", "comprising" and " including " term are not precluded from one or many
The presence or addition of individual other components or its combination.
Embodiment 1：
The present embodiment adhesive system is modeling based binder system, consists of the following composition：It is polyformaldehyde POM 84%, highly dense
Degree polyethylene HDPE 6%, ethylene-vinyl acetate copolymer EVA 5.5%, stearic acid SA 4%, antioxidant 0.5%, will be above-mentioned
Component is blended, and reaches composition uniformly, obtains moulding based binder；400 mesh of bronze powder D90 particle diameters used, powder are loaded
Measure as 63vol%.
The present embodiment concrete technology step is as follows：
Step 1, by the bronze powder of 400 mesh particle diameters of D90 and modeling based binder be sequentially placed into kneading machine, in melting temperature
For at 165～175 DEG C knead 1～1.5H, rotating speed be 10～20r/min of initial stage, after modeling based binder fusing after rotating speed be 20～
Then the powder for kneading is moulded coalition in granulator granulation so that the further mix homogeneously of feeding by 30r/min；
Step 2, it is 180～190 DEG C, injection pressure 90～120MPa in injection temperature by step 1 obtained feeding
Under the conditions of injection obtain the green compact of required form；
Step 3, be put into step 2 inject in debinding furnace into parison, temperature be 115～140 DEG C, medium be oxalic acid
Under conditions of 4～5h of defat；
Step 4, the green compact after oxalic acid catalyst defat are placed in sintering furnace, carry out at a temperature of 30～600 thermal debinding 4～
5h,
Step 5, the good green compact of defat are put in the sintering furnace that temperature is 930～960 DEG C 3～4h of sintering, sintering atmosphere
For cracking ammonia, copper alloy sintered part is obtained；The relative sintered density of test sintered part is 97.1%, tensile strength 206～
215MPa, hardness are 56～61HB, within dimensional accuracy is 0.3%.
Embodiment 2：
The present embodiment adhesive system is modeling based binder system, consists of the following composition：It is polyformaldehyde POM 84%, highly dense
Degree polyethylene HDPE 6%, ethylene-vinyl acetate copolymer EVA 5.5%, stearic acid SA 4%, antioxidant 0.5%, will be above-mentioned
Component is blended, and reaches composition uniformly, obtains moulding based binder；500 mesh of brass powder particle diameter used, powder loading is
56vol%.
The present embodiment concrete technology step is as follows：
Step 1, by the brass powder of 500 mesh of particle diameter and modeling based binder be sequentially placed into kneading machine, melting temperature be 165
1.2～1.8h is kneaded at～175 DEG C, rotating speed is 10～20r/min of initial stage, and rotating speed is 30～40r/ after modeling based binder fusing
Then the powder for kneading is moulded coalition in granulator granulation so that the further mix homogeneously of feeding by min；
Step 2, it is 180～190 DEG C, injection pressure 90～120MPa in injection temperature by step 1 obtained feeding
Under the conditions of injection obtain the green compact of required form；
Step 3, step 2 injected green compact are put in debinding furnace, temperature be 115～140 DEG C, medium be oxalic acid
Under the conditions of 5～7h of defat；
Step 4, the defat of oxalic acid catalyst good green compact are put into sintering furnace carry out thermal debinding, thermal debinding temperature is 30～600
Temperature, thermal debinding time are 4～5h；
Step 5, the green compact after thermal debinding are placed in the sintering furnace that temperature is 850～960 DEG C 3～4h of sintering, sinter gas
Atmosphere is cracking ammonia, finally gives brass alloys sintered part；The relative sintered density of test sintered part is 96.7%, tensile strength
218～229MPa, hardness are 60～66HB, within dimensional accuracy is 0.5%.
Embodiment 3：
The present embodiment adhesive system is modeling based binder system, consists of the following composition：It is polyformaldehyde POM 84%, highly dense
Degree polyethylene HDPE 6%, ethylene-vinyl acetate copolymer EVA 5.5%, stearic acid SA 4%, antioxidant 0.5%, will be above-mentioned
Component is blended, and reaches composition uniformly, obtains moulding based binder.400 mesh of fine copper powder D90 particle diameters used, powder are loaded
Measure as 63vol%.
The present embodiment concrete technology step is as follows：
Step 1, fine copper powder that D90 particle diameters are 400 mesh and modeling based binder are sequentially placed into into kneading machine, in melting temperature
For 0.8～1.2h is kneaded at 165～175 DEG C, rotating speed is 10～20r/min of initial stage, and after binding agent fusing, rotating speed is 25～35r/
Then the powder for kneading is moulded coalition in granulator granulation so that the further mix homogeneously of feeding by min；
Step 2, it is 180～190 DEG C, injection pressure 90～120MPa in injection temperature by step 1 obtained feeding
Under the conditions of injection obtain the green compact of required form；
Step 3, be put into step 2 inject in debinding furnace into parison, temperature be 115～140 DEG C, medium be oxalic acid
Under conditions of 4～5H of defat；
Step 4, the green compact after oxalic acid catalyst defat are put into into sintering furnace carry out thermal debinding：Enter at a temperature of 30～600 DEG C
Row 4～5h of thermal debinding；
Step 5, the green compact after thermal debinding are sintered into 3～4h at 980～1050 DEG C, sintering atmosphere is cracking ammonia, finally
Obtain copper alloy sintered part；The relative sintered density of test sintered part is 96.3%, 178～185MPa of tensile strength, elongation percentage
For 21.7%～23.3%, the coefficient of heat conduction is 326～331W/ (m DEG C), and electric conductivity is 61.2%～69.3%IACS, chi
Within very little precision is 0.3%.
Embodiment 4：
The present embodiment adhesive system is modeling based binder system, consists of the following composition：It is polyformaldehyde POM 90%, highly dense
Degree polyethylene HDPE 3.5%, ethylene-vinyl acetate copolymer EVA 2%, stearic acid SA 4%, antioxidant 0.5%, will be above-mentioned
Component is blended, and reaches composition uniformly, obtains moulding based binder.500 mesh of copper-nickel alloy powder diameter used, powder loading
For：56vol%.
The present embodiment concrete technology step is as follows：
Step 1, by the copper-nickel alloy powder of 500 mesh of D90 particle diameters and modeling based binder be sequentially placed into kneading machine, in melting temperature be
1～1.5h is kneaded at 165～175 DEG C, rotating speed is 10～20r/min of initial stage, and rotating speed is 30～40r/ after modeling based binder fusing
Then the powder for kneading is moulded coalition in granulator granulation so that the further mix homogeneously of feeding by min；
Step 2, it is 180～190 DEG C, injection pressure 90～120MPa in injection temperature by step 1 obtained feeding
Under the conditions of injection obtain the green compact of required form；
Step 3, step 2 injected being put in debinding furnace into parison is carried out into oxalic acid catalyst defat, temperature be 115～
140 DEG C, medium be oxalic acid under conditions of 5～7h of defat；
Step 4, the green compact after oxalic acid catalyst defat are carried out into thermal debinding in temperature is the sintering furnace at a temperature of 30～600
4～5h；
Step 5, the good green compact of thermal debinding is put in sintering furnace it is sintered, 3～4h is sintered at 950～1050 DEG C,
Sintering atmosphere is cracking ammonia, finally gives copper alloy element；The relative sintered density of test sintered part is more than 96.9%, is drawn
181～191MPa of intensity is stretched, elongation percentage is 22.1%～24.3%.
Although embodiment of the present invention is disclosed as above, which is not restricted to listed by description and embodiment
With, it can be applied to various suitable the field of the invention completely, for those skilled in the art, can be easily
Other modification is realized, therefore under the general concept limited without departing substantially from claim and equivalency range, the present invention is not limited
In specific details and shown here as the embodiment with description.
Claims (12)
1. a kind of modeling based binder for copper and copper alloy injection moulding, it is characterised in that the modeling based binder is by polyformaldehyde
POM, high density polyethylene, ethylene-vinyl acetate copolymer EVA, stearic acid SA and antioxidant are according to certain ratio
Obtained from example is blended.
2. the modeling based binder for copper and copper alloy injection moulding according to claim 1, it is characterised in that the modeling
Based binder includes by percentage to the quality：Polyformaldehyde POM 70%～95%, high density polyethylene 0.5%～10%,
Ethylene-vinyl acetate copolymer EVA 0.2%～10%, stearic acid SA 0.2～4% and antioxidant 0.1～5.0%.
3. a kind of usage right requires the modeling based binder injection moulding copper for copper and copper alloy injection moulding described in 1 or 2
And the method for copper alloy parts, it is characterised in that comprise the following steps：
S1. prepare modeling based binder：By polyformaldehyde POM, high density polyethylene, ethylene-vinyl acetate copolymer EVA, hard
Fat acid SA and antioxidant are blended according to certain ratio, and it is uniform to reach composition；
S2. mixing, pelletize：Fine copper powder or copper alloy powder are added in rubber mixing machine, a certain proportion of modeling base is subsequently adding
Binding agent, is manufactured into feeding by extruding granulator after mixing is uniform again；
S3. injection moulding：By the feeding under certain injection temperature and injection pressure injection moulding, produce green compact；
S4. defat：Under catalysis of the oxalic acid for catalyst, the green compact are placed in debinding furnace carries out oxalic acid catalyst defat, then
Green compact are taken out, and thermal debinding are entered in being put into sintering furnace；
S5. sinter：Under the protection of reducing atmosphere or inert atmosphere, high temperature is carried out to the green compact after thermal debinding in sintering furnace
Sintering, obtains finished product after cooling.
4. the method for injection moulding copper and copper alloy parts according to claim 3, it is characterised in that in the S2, mixes
Refining temperature is 165～175 DEG C, and mixing time is 0.8～1.8h.
5. the method for injection moulding copper and copper alloy parts according to claim 3, it is characterised in that in the S3, note
Temperature is penetrated for 170～190 DEG C, injection pressure is 90～120MPa.
6. the method for injection moulding copper and copper alloy parts according to claim 3, it is characterised in that in the S4, grass
Sour catalyst skimming temp is 85～145 DEG C, and oxalic acid catalyst degreasing time is 4～12h.
7. the method for injection moulding copper and copper alloy parts according to claim 3, it is characterised in that in the S4, heat
The temperature of defat is 30～600 DEG C, and the thermal debinding time is 4～5h.
8. the method for injection moulding copper and copper alloy parts according to claim 3, it is characterised in that in the S5, burns
Junction temperature is 800～1050 DEG C, and sintering time is 2～4h, and sintering atmosphere is cracking ammonia.
9. the method for injection moulding copper and copper alloy parts according to claim 8, it is characterised in that fine copper powder is
D90 particle diameters are the aerosolization of 400～600 mesh or water atomization fine copper powder, and sintering temperature is 900～1050 DEG C.
10. the method for injection moulding copper and copper alloy parts according to claim 8, it is characterised in that copper alloy powder
It is aerosolization or water atomization bronze powder that D90 particle diameters are 400～600 mesh, sintering temperature is 850～960 DEG C.
The method of 11. injection moulding copper and copper alloy parts according to claim 8, it is characterised in that copper alloy powder
It is aerosolization or water atomization brass powder that D90 particle diameters are 400～600 mesh, sintering temperature is 800～960 DEG C.
The method of 12. injection moulding copper and copper alloy parts according to claim 8, it is characterised in that copper alloy powder
It is aerosolization or water atomization copper-nickel alloy powder that D90 particle diameters are 400～600 mesh, sintering temperature is 800～1050 DEG C.
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| CN114682778A (en) * | 2022-02-23 | 2022-07-01 | 北京科技大学 | Method for preparing titanium-based product based on fine spherical titanium-based powder and titanium-based product |
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