CN113547118A - Adhesive compatibilized metal powder feeding and mixing method - Google Patents
Adhesive compatibilized metal powder feeding and mixing method Download PDFInfo
- Publication number
- CN113547118A CN113547118A CN202110810779.3A CN202110810779A CN113547118A CN 113547118 A CN113547118 A CN 113547118A CN 202110810779 A CN202110810779 A CN 202110810779A CN 113547118 A CN113547118 A CN 113547118A
- Authority
- CN
- China
- Prior art keywords
- binder
- metal powder
- molecular weight
- powder
- compatibilizer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000843 powder Substances 0.000 title claims abstract description 135
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 59
- 239000002184 metal Substances 0.000 title claims abstract description 59
- 238000002156 mixing Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000000853 adhesive Substances 0.000 title claims description 4
- 230000001070 adhesive effect Effects 0.000 title claims description 4
- 239000011230 binding agent Substances 0.000 claims abstract description 149
- 238000010438 heat treatment Methods 0.000 claims abstract description 44
- 239000000203 mixture Substances 0.000 claims abstract description 34
- 238000003756 stirring Methods 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000002904 solvent Substances 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 8
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 18
- -1 polyethylene Polymers 0.000 claims description 17
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 12
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 10
- 239000003208 petroleum Substances 0.000 claims description 10
- 239000004743 Polypropylene Substances 0.000 claims description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 9
- 229920001155 polypropylene Polymers 0.000 claims description 9
- 239000010936 titanium Substances 0.000 claims description 9
- 229910052719 titanium Inorganic materials 0.000 claims description 9
- 239000001993 wax Substances 0.000 claims description 9
- 235000021355 Stearic acid Nutrition 0.000 claims description 8
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 8
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 8
- 239000012188 paraffin wax Substances 0.000 claims description 8
- 239000008117 stearic acid Substances 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 7
- 229920001971 elastomer Polymers 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- 239000005060 rubber Substances 0.000 claims description 7
- 239000005062 Polybutadiene Substances 0.000 claims description 6
- 229920002857 polybutadiene Polymers 0.000 claims description 6
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 6
- 238000009835 boiling Methods 0.000 claims description 4
- 229910000531 Co alloy Inorganic materials 0.000 claims description 3
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 3
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 3
- 229910001080 W alloy Inorganic materials 0.000 claims description 3
- TXQVDVNAKHFQPP-UHFFFAOYSA-N [3-hydroxy-2,2-bis(hydroxymethyl)propyl] octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(CO)(CO)CO TXQVDVNAKHFQPP-UHFFFAOYSA-N 0.000 claims description 3
- 239000004203 carnauba wax Substances 0.000 claims description 3
- 235000013869 carnauba wax Nutrition 0.000 claims description 3
- 239000004200 microcrystalline wax Substances 0.000 claims description 3
- 235000019808 microcrystalline wax Nutrition 0.000 claims description 3
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 claims description 3
- 235000019809 paraffin wax Nutrition 0.000 claims description 3
- 235000019271 petrolatum Nutrition 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 19
- 238000001704 evaporation Methods 0.000 abstract description 8
- 239000006185 dispersion Substances 0.000 abstract description 3
- 238000007865 diluting Methods 0.000 abstract 1
- 239000008187 granular material Substances 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 29
- 238000000576 coating method Methods 0.000 description 29
- 230000000052 comparative effect Effects 0.000 description 17
- 239000002245 particle Substances 0.000 description 12
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 9
- 229920006324 polyoxymethylene Polymers 0.000 description 9
- 238000005238 degreasing Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 235000011837 pasties Nutrition 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
A metal powder feeding and mixing method of binder compatibilization comprises the steps of S1, dissolving a low molecular weight binder in a compatibilizer, heating and stirring until the low molecular weight binder is completely dissolved; s2, adding metal powder, continuing heating and stirring until the mixture is stirred into a mud-like substance, and continuing stirring for 30 minutes; s3, pouring the paste into a mixing roll, heating and mixing, then adding a binder with medium molecular weight and high molecular weight, heating and mixing, and evaporating the compatibilizer until all materials form dough. The invention helps the binder to be evenly attached to the surface of each powder by dissolving and diluting the binder with the compatibilizer, then coats the binder with medium molecular weight and high molecular weight, and finally evaporates and removes the solubilizer in the mixing process to obtain the feed with correct proportion, and makes the feed into lumps and granulate. The method is simple and convenient, the outer surface binder of the metal powder is completely coated, and the dispersion effect is good, so that the powder fluidity is improved.
Description
Technical Field
The invention relates to the technical field of surface treatment of metal powder, in particular to a metal powder feeding and mixing method for binder compatibilization.
Background
Powder forming techniques are the basic process for many ceramic and metal parts. The preparation of feedstock by mixing inorganic powder with binder is the main process of metal injection molding, however, when the particle size of inorganic powder is smaller, the relative surface area is increased, under the same volume or weight state, the larger the number of particles of powder is, the finer the particles are, and the total surface area of powder is increased by square times with the increase of the number of particles. Assuming that the powder is stainless steel 316L and spherical, the amount of powder in 1 gram of powder with different particle size values can be calculated, and the calculation in the figure is performed by converting volume and density into weight, and the smaller the diameter of each gram of powder is, the larger the total number of powder particles appears. Of course, the total surface area of the powder is also not the same. This is most common physically, the finer the powder particles, the higher the surface area/weight they have.
Because the particle size of titanium metal powder is mostly smaller than 60 mu m and even finer, and the particles of the binder are very large (massive paraffin, stearic acid coarse powder and various plastic particles), the titanium metal powder is stirred and heated firstly in the traditional mixing process, and then the binder is thrown into the binder to melt, so that the titanium metal powder is not easy to be uniform and is quite dangerous, the active and easily oxidized characteristics of the titanium metal are well known, especially the friction of the fine powder particles in the air and the mixing process, the titanium metal powder is mutually rubbed for a period of time when the binder does not melt the cladding powder, the oxidation and even combustion are very easy, and the operation is very dangerous and difficult. Then, the binder with fixed volume can be uniformly coated on the surface of each powder body with certain difficulty, the coating effect can be achieved only after the binder with high molecular weight is completely melted by heating, but the low molecular binder with lower temperature is easy to evaporate and vaporize and is quite difficult to control.
Furthermore, in general, the volume ratio of powder to binder is designed in advance before mixing, and a reasonable value is represented by the ratio of binder: the powder is 30: 70-55: 45, but in many years of manufacturing and research experience, 37:63 is difficult to handle, and as the proportion of the powder is higher, the shrinkage ratio of the solidified product is smaller and the deformation chance is smaller after the injection of the blank and the subsequent degreasing and sintering are completed, so that many people try to feed the powder with higher volume ratio, but the failure is mostly ended. The main problem is mostly because the dispersion effect of binder is poor, and the unable effectual parcel powder of binder makes injection molding process be difficult to inject the feed to the mould in, leads to plugging up the barrel even.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a metal powder feeding and mixing method for increasing the volume of a binder, which uses a compatibilizer to dissolve and dilute the binder to help the binder to be attached to the surface of each powder very uniformly, but does not increase the volume of the binder. Finally, the solubilizer is evaporated and removed in the process of mixing materials, and the feed with the correct proportion is obtained to be made into lumps and granulated. The method is simple and convenient, the binder on the outer surface of the metal powder is completely coated, the dispersion effect of the binder is good, the powder fluidity is improved, and the potential safety hazard caused by friction due to incomplete coating is also avoided.
In order to achieve the purpose, the invention provides the following technical scheme:
a metal powder feeding and mixing method for binder compatibilization is characterized in that metal powder is added into a binder and uniformly mixed, so that the binder coats the outer surface of the metal powder, and the method comprises the following steps:
s1, dissolving the low-molecular-weight binder in the compatibilizer, heating and stirring at the temperature of 45-60 ℃ until the binder is completely dissolved;
s2, adding metal powder, continuing heating and stirring at the heating temperature of 45-60 ℃ until the mixture is stirred into a mud-like substance, and continuing stirring for 30 minutes;
s3, pouring the mud into a mixing roll, heating and mixing, and pressurizing from 101Kpa to 505-1010 Kpa by a ram pressure; when the temperature is raised to 120 ℃, the binder with medium molecular weight and high molecular weight is added, the mixture is heated and mixed, and the compatibilizer is evaporated until all materials form dough.
Preferably, the ratio of the total volume of the binder to the total volume of the metal powder and the compatibilizer is 30:70: 60-300-55: 45: 110-550, wherein the compatibilizer is 2-10 times of the total volume of the binder, and the low-molecular-weight binder accounts for 2-10% of the total volume of the binder.
Preferably, the compatibilizer is one or more of n-heptane, 70 # petroleum-based solvent greases, 90 # petroleum-based solvent greases, and 120 # petroleum-based solvent greases, and the boiling range maximum temperature point does not exceed 120 ℃.
Preferably, the low molecular weight binder is one or more of stearic acid, zinc stearate, pentaerythritol stearate, ethylene bis-stearamide, paraffin wax, microcrystalline wax, carnauba wax, Fischer-Tropsch wax and polyethylene wax.
Preferably, the medium molecular weight binder is one or more of butadiene rubber and rubber.
Preferably, the high molecular weight binder is one or more of polyformaldehyde, ethylene-vinyl acetate copolymer, polypropylene and polyethylene.
Preferably, the metal of the metal powder includes titanium, titanium alloy, iron alloy, copper alloy, nickel alloy, cobalt alloy, and tungsten alloy.
Compared with the prior art, the invention has the following beneficial effects:
1. the low-molecular-weight binder is dissolved and diluted by the compatibilizer, so that a thin layer of binder can be effectively coated on the outer surface of the metal powder, and then the medium-molecular-weight binder and the high-molecular-weight binder are used for secondary coating, so that the problems of oxidation and even combustion caused by friction between the metal powder due to incomplete and uneven coating when the high-molecular-weight binder is directly coated can be solved, and the compatibilizer is favorable for dissolving the binder, so that the binder of the final powder is completely coated, has good dispersibility and good fluidity;
2. because the low molecular weight binder is easily gasified by heating, a porous structure is easily formed during degreasing in a subsequent process, and the product is twisted and fragile. By controlling the proportion of the low-molecular-weight binder to be 2-10%, the porous structure of the product is less, and the product is not easy to distort and break when the metal powder is subjected to degreasing treatment;
3. the high molecular weight binder is used as a high-temperature framework to play a role of shape keeping, even if the powder can be supported to maintain the shape before being sintered, the product formed by subsequent sintering keeps relative geometric relationship;
4. the low molecular weight binder and the high molecular weight binder can be connected by adding the medium molecular weight binder, and the low molecular weight binder and the high molecular weight binder are filled;
5. the boiling range maximum temperature point of the compatibilizer does not exceed 120 ℃, so that the compatibilizer can be gasified conveniently.
Drawings
FIG. 1 shows different data of total number of particles and surface area per gram of seed powder due to different diameters;
FIG. 2 comparative enlargement of uncoated versus coated powder of example 1;
FIG. 3 is an enlarged view of the powder coating of comparative example 1;
FIG. 4 is a schematic view of a titanium metal sludge treatment sequence;
FIG. 5 is a schematic diagram of the mixing of the mixer.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 4 and 5, the present invention provides the following technical solutions:
a metal powder feeding and mixing method for binder compatibilization is characterized in that metal powder is added into a binder and uniformly mixed, so that the binder coats the outer surface of the metal powder, and the method comprises the following steps:
s1, dissolving the low-molecular-weight binder in the compatibilizer, heating and stirring at the temperature of 45-60 ℃ until the binder is completely dissolved;
s2, adding metal powder, continuing heating and stirring at the heating temperature of 45-60 ℃ until the mixture is stirred into a mud-like substance, and continuing stirring for 30 minutes;
s3, pouring the mud into a mixing roll, heating and mixing, and pressurizing from 101Kpa to 505-1010 Kpa by a ram pressure; when the temperature is raised to 120 ℃, the binder with medium molecular weight and high molecular weight is added, the mixture is heated and mixed, and the compatibilizer is evaporated until all materials form dough.
Preferably, the ratio of the total volume of the binder to the total volume of the metal powder and the compatibilizer is 30:70: 60-300-55: 45: 110-550. The volume of the compatibilizer is 2-10 times of the total volume of the binder, so that the compatibilizer is more favorable for dissolving the binder and can be uniformly coated on the surface of the powder. The low molecular weight binder accounts for 2-10% of the total volume of the binder. Because the low molecular weight binder is easily gasified by heating, a porous structure is easily formed during degreasing in a subsequent process, and the product is twisted and fragile. By controlling the proportion of the low molecular weight binder to be 2% -10%, the porous structure of the product is less, and the product is not easy to distort and break when the metal powder is subjected to degreasing treatment. The ratio of the total volume of the binder to the volume of the metal powder can be controlled, so that after the powder is coated and molded, the shrinkage ratio of a cured product is small, and the deformation chance is small.
Preferably, the compatibilizer is one or a mixture of more of n-heptane, 70 # petroleum-based solvent greases, 90 # petroleum-based solvent greases and 120 # petroleum-based solvent greases, the boiling range maximum temperature point does not exceed 120 ℃, and the compatibilizer can be conveniently gasified during mixing.
Preferably, the low molecular weight binder is one or more of stearic acid, zinc stearate, pentaerythritol stearate, ethylene bis-stearamide, paraffin wax, microcrystalline wax, carnauba wax, Fischer-Tropsch wax and polyethylene wax.
Preferably, the medium molecular weight binder is one or more of butadiene rubber and rubber. Can connect the low molecular weight binder and the high molecular weight binder and fill up the space between the low molecular weight binder and the high molecular weight binder.
Preferably, the high molecular weight binder is one or more of polyformaldehyde, ethylene-vinyl acetate copolymer, polypropylene and polyethylene. The high-temperature skeleton plays a role of shape keeping, even if the powder can be supported to maintain the shape before being unsintered, the relative geometrical relation of products formed by subsequent sintering is kept.
Preferably, the metal of the metal powder includes titanium, titanium alloy, iron alloy, copper alloy, nickel alloy, cobalt alloy, and tungsten alloy. Pure elements of iron, copper, nickel, cobalt, tungsten and other metals are typical metals which are not easy to mix after being finely pulverized, and the mixing homogenization of the metals is facilitated by a compatibilization method.
According to the invention, the low-molecular-weight binder is dissolved and diluted by the compatibilizer, so that a thin layer of binder can be effectively coated on the outer surface of the metal powder, and then the medium-molecular-weight and high-molecular-weight binders are used for secondary coating, so that the problem of oxidation and even combustion caused by friction between the metal powder when the high-molecular-weight binder is directly coated can be avoided. Because the compatibilizer is contained, the binder is dissolved favorably, and the problems of incomplete and non-uniform wrapping can not occur. And because the compatibilizer is beneficial to dissolving the binder, the binder of the final powder is completely coated, the dispersibility is good, and the obtained powder has good fluidity.
The following examples are provided to further illustrate the embodiments of the present invention and are not intended to limit the scope of the present invention.
Example 1 (low molecular weight 10%, compatibilizer/binder: 2 times, titanium alloy powder, binder/powder = 1)
Firstly, 10g of low-molecular-weight binder (5 g of stearic acid and 5g of paraffin) is put into 108g of compatibilizer (n-heptane), and the mixture is heated and stirred at the temperature of 45-60 ℃ until the binder is completely dissolved. Adding 360g of titanium alloy powder, continuously heating and stirring at the temperature of 45-60 ℃ until the mixture is stirred into a mud-like substance, and continuously stirring for 30 minutes. And pouring the paste into a mixing roll, heating and mixing the paste under the pressure of 1 atmosphere (101 Kpa) until the pressure reaches 10 atmospheres (1010 Kpa), heating to 120 ℃, adding 30g of medium molecular weight (butadiene rubber) and 60g of high molecular weight binder (10 g of ethylene-vinyl acetate copolymer +20g of polypropylene +30g of polyformaldehyde), heating and mixing the paste, and evaporating the compatibilizer until all materials form dough. The obtained powder has the flowability of 400-550 g/10min, and the coating effect is as shown in figure 2, and the powder is completely and uniformly coated. The specific parameters are as follows in table 1:
table 1 example 1 composition parameter table
Example 2 (low molecular weight 2%, compatibilizer/binder: 2 times, titanium alloy powder, binder/powder = 1)
Firstly, 2g of low molecular weight binder (1 g of stearic acid +1g of paraffin) is put into 103.7g of compatibilizer (n-heptane), and the mixture is heated and stirred at the temperature of 45-60 ℃ until the binder is completely dissolved. Adding 343.4g of titanium alloy powder, continuously heating and stirring at the temperature of 45-60 ℃ until the mixture is stirred into a mud-like substance, and continuously stirring for 30 minutes. And pouring the paste into a mixing roll, heating and mixing the paste under the pressure of 1 atmosphere (101 Kpa) until the pressure is increased to 10 atmospheres (1010 Kpa), adding 5g of medium molecular weight (rubber) and 93g of high molecular weight binder (5 g of ethylene-vinyl acetate copolymer +3g of polyethylene +85g of polyformaldehyde) when the temperature is increased to 120 ℃, heating and mixing the paste, and evaporating the compatibilizer until all materials form dough. The obtained powder has the flowability of 425-580 g/10min, the coating effect is consistent with that of the powder shown in figure 2, and the powder is completely and uniformly coated. The parameters are as follows in table 2:
table 2 example 2 composition parameter table
Example 3 (low molecular weight 5%, compatibilizer/binder: 10 times, titanium alloy powder, binder/powder = 0.67)
Firstly, 5g of low molecular weight binder (3 g of stearic acid and 2g of paraffin) is put into 522.9g of compatibilizer (n-heptane), and the mixture is heated and stirred at the temperature of 45-60 ℃ until the binder is completely dissolved. Adding 519.1g of titanium alloy powder, continuously heating and stirring at the temperature of 45-60 ℃ until the mixture is stirred into a mud-like substance, and continuously stirring for 30 minutes. And pouring the paste into a mixing roll, heating and mixing the paste under the pressure of 1 atmosphere (101 Kpa) until the pressure is 10 atmospheres (1010 Kpa), heating to 120 ℃, adding 5g of medium molecular weight (butadiene rubber) and 90g of high molecular weight binder (5 g of ethylene-vinyl acetate copolymer +5g of polypropylene +80g of polyformaldehyde), heating and mixing the paste, and evaporating the compatibilizer until all materials form dough. The obtained powder has the flowability of 320-500 g/10min, the coating effect is consistent with that of figure 2, and the powder is completely and uniformly coated. The specific parameters are as follows in table 3:
table 3 example 3 composition parameter table
Example 4 (low molecular weight 8%, compatibilizer/binder: 5 times, titanium alloy powder, binder/powder = 0.85)
Firstly, 8g of low molecular weight binder (4 g of zinc stearate +4g of Fischer-Tropsch wax) is put into 312.4g of compatibilizer (No. 90 petroleum-based solvent), and the mixture is heated and stirred at the temperature of 45-60 ℃ until the binder is completely dissolved. Adding 412.6g of titanium alloy powder, continuously heating and stirring at the temperature of 45-60 ℃ until the mixture is stirred into a mud-like substance, and continuously stirring for 30 minutes. And pouring the paste into a mixing roll, heating and mixing the paste under the pressure of 1 atmosphere (101 Kpa) until the pressure is 10 atmospheres (1010 Kpa), heating to 120 ℃, adding 5g of medium molecular weight binder (rubber) and 87g of high molecular weight binder (3 g of ethylene-vinyl acetate copolymer +3g of polypropylene +81g of polyformaldehyde), heating and mixing the mixture, and evaporating the compatibilizer until all materials form dough. The obtained powder has the flowability of 300-420 g/10min, the coating effect is consistent with that shown in figure 2, and the powder is completely and uniformly coated. The specific parameters are as follows in table 4:
table 4 example 4 composition parameter table
Example 5 (low molecular weight 6%, compatibilizer/binder: 6 times, stainless steel powder 316L, binder/powder = 0.59)
Firstly, 6g of low molecular weight binder (3 g of zinc stearate +3g of Fischer-Tropsch wax) is put into 369.1g of compatibilizer (No. 80 petroleum-based solvent), and the mixture is heated and stirred at the temperature of 45-60 ℃ until the binder is completely dissolved. 1034.4g of 316L stainless steel powder is added, the heating and the stirring are continued, the temperature is 45-60 ℃, the stirring is carried out until the mixture is pasty, and the stirring is continued for 30 minutes. And pouring the paste into a mixing roll, heating and mixing the paste under the pressure of 1 atmosphere (101 Kpa) until the pressure is increased to 10 atmospheres (1010 Kpa), heating to 120 ℃, adding 5g of medium molecular weight binder (rubber) and 89g of high molecular weight binder (1 g of ethylene-vinyl acetate copolymer +3g of polypropylene +85g of polyformaldehyde), heating and mixing the mixture, and evaporating the compatibilizer until all materials form dough. The obtained powder has the flowability of 1250-1500 g/10min, the coating effect is consistent with that of figure 2, and the powder is completely and uniformly coated. The specific parameters are as follows in table 5:
table 5 example 5 composition parameter table
Example 6 (low molecular weight 6%, compatibilizer/binder: 10 times, pure copper powder, binder/powder = 0.81)
Firstly, putting 6g of low-molecular-weight binder (3 g of zinc stearate +3g of Fischer-Tropsch wax) into 615g of compatibilizer (No. 80 petroleum-based solvent), heating and stirring at the temperature of 45-60 ℃ until the binder is completely dissolved. Adding 836.6g of pure copper powder, continuously heating and stirring at the temperature of 45-60 ℃ until the mixture is stirred into a paste, and continuously stirring for 30 minutes. And pouring the paste into a mixing roll, heating and mixing the paste under the pressure of 1 atmosphere (101 Kpa) until the pressure is increased to 10 atmospheres (1010 Kpa), heating to 120 ℃, adding 5g of medium molecular weight binder (rubber) and 89g of high molecular weight binder (1 g of ethylene-vinyl acetate copolymer +3g of polypropylene +85g of polyformaldehyde), heating and mixing the mixture, and evaporating the compatibilizer until all materials form dough. The obtained powder has the flowability of 690-880 g/10min, the coating effect is consistent with that of figure 2, and the powder is completely and uniformly coated. The specific parameters are as follows in table 6:
table 6 example 6 composition parameter table
Comparative example 1
Mixing 360g of titanium alloy powder with 10g of low-molecular-weight binder (5 g of stearic acid +5g of paraffin), 30g of medium-molecular-weight (butadiene rubber) and 60g of high-molecular-weight binder (10 g of ethylene-vinyl acetate copolymer +20g of polypropylene +30g of polyformaldehyde), pouring into a mixing roll, heating and mixing at 120 ℃, increasing the pressure to 10 atmospheric pressure (1010 KPa) under the pressure of 1KPa, and evaporating the compatibilizer until all materials form a dough. The obtained powder has the flowability of 380-530 g/10min, and the coating effect is as shown in figure 3, wherein the phenomenon of skin breaking occurs due to the lack of a low-molecular-weight binder in the powder coating.
Comparative example 2
The difference compared to comparative example 1 is that the composition of the binder and the powder is the same as the grammage, and the others are the same. The grammage of the components of the binder and of the metal powder was the same as in example 2. The obtained powder has the flowability of 340-510 g/10min, the coating effect is consistent with that shown in figure 3, and the phenomenon of skin breaking occurs due to the lack of a low-molecular-weight binder in the powder coating.
Comparative example 3
The difference compared to comparative example 1 is that the composition of the binder and the powder is the same as the grammage, and the others are the same. The grammage of the components of the binder and of the metal powder was the same as in example 3. The obtained powder has the flowability of 280-430 g/10min, the coating effect is consistent with that of the powder shown in figure 3, and the phenomenon of skin breaking occurs due to the lack of a low-molecular-weight binder in the powder coating.
Comparative example 4
The difference compared to comparative example 1 is that the composition of the binder and the powder is the same as the grammage, and the others are the same. The grammage of the components of the binder and of the metal powder was the same as in example 4. The obtained powder has the flowability of 210-400 g/10min, the coating effect is consistent with that shown in figure 3, and the phenomenon of skin breaking occurs due to the lack of a low-molecular-weight binder in the powder coating.
Comparative example 5
The difference compared to comparative example 1 is that the composition of the binder and the powder is the same as the grammage, and the others are the same. The grammage of the components of the binder and of the metal powder was the same as in example 5. The obtained powder has the flowability of 830-1120 g/10min, the coating effect is consistent with that shown in figure 3, and the phenomenon of skin breaking occurs due to the lack of a low-molecular-weight binder in the powder coating.
Comparative example 6
The difference compared to comparative example 1 is that the composition of the binder and the powder is the same as the grammage, and the others are the same. The grammage of the components of the binder and of the metal powder was the same as in example 6. The obtained powder has the flowability of 560-730 g/10min, the coating effect is consistent with that shown in figure 3, and the phenomenon of skin breaking occurs due to the lack of a low-molecular-weight binder in the powder coating.
The powder products obtained according to examples 1 to 6 and comparative examples 1 to 6 were tested for flowability data vs. Table 7.
TABLE 7 comparison of flowability data for examples 1-6 and comparative examples 1-6
In summary, examples 1-6 showed better powder flowability, better dispersibility, and complete and uniform coating than comparative examples 1-6. The coating according to fig. 2 (coating effect diagram of the present invention) and fig. 3 (coating effect diagram of the comparative example) was complete and uniform with respect to the coating of the original formulation powder, and no skin breakage occurred.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A metal powder feeding and mixing method for increasing the capacity of a binder is characterized in that the metal powder is added into the binder and uniformly mixed, so that the binder coats the outer surface of the metal powder, and the method comprises the following steps:
s1, dissolving the low-molecular-weight binder in the compatibilizer, heating and stirring at the temperature of 45-60 ℃ until the binder is completely dissolved;
s2, adding metal powder, continuing heating and stirring at the heating temperature of 45-60 ℃ until the mixture is stirred into a mud-like substance, and continuing stirring for 30 minutes;
s3, pouring the mud into a mixing roll, heating and mixing, and pressurizing from 101Kpa to 505-1010 Kpa by a ram pressure; when the temperature is raised to 120 ℃, the binder with medium molecular weight and high molecular weight is added, the mixture is heated and mixed, and the compatibilizer is evaporated until all materials form dough.
2. The metal powder feeding and mixing method for the binder compatibilization as claimed in claim 1, wherein the ratio of the total volume of the binder to the total volume of the metal powder and the compatibilizer is 30:70: 60-300-55: 45: 110-550, wherein the compatibilizer is 2-10 times of the total volume of the binder, and the low molecular weight binder accounts for 2-10% of the total volume of the binder.
3. An adhesive compatibilized metal powder feed mixing process as in claim 1 or 2 wherein the compatibilizer is one or more of n-heptane, 70, 90, 120 petroleum-based solvent greases, and the maximum boiling point is no more than 120 ℃.
4. A binder compatibilized metal powder feed mixing process in accordance with claim 1 or 2, wherein said low molecular weight binder is one or more of stearic acid, zinc stearate, pentaerythritol stearate, ethylene bis stearamide, paraffin wax, microcrystalline wax, carnauba wax, fischer tropsch wax, polyethylene wax.
5. An adhesive-compatibilized metal powder feed mixing method as claimed in claim 1 or 2, wherein the medium molecular weight adhesive is one or more of butadiene rubber and rubber.
6. A method for feeding and mixing metal powder with a binder for compatibilization according to claim 1 or 2, wherein the high molecular weight binder is one or more of polyoxymethylene, ethylene-vinyl acetate copolymer, polypropylene and polyethylene.
7. A binder-compatibilized metal powder feed mixing process as in claim 1 or 2, wherein the metal of said metal powder comprises titanium, titanium alloys, iron alloys, copper alloys, nickel alloys, cobalt alloys, and tungsten alloys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110810779.3A CN113547118B (en) | 2021-07-19 | 2021-07-19 | Metal powder feeding mixing method for increasing capacity of binder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110810779.3A CN113547118B (en) | 2021-07-19 | 2021-07-19 | Metal powder feeding mixing method for increasing capacity of binder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113547118A true CN113547118A (en) | 2021-10-26 |
| CN113547118B CN113547118B (en) | 2023-08-01 |
Family
ID=78103329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110810779.3A Active CN113547118B (en) | 2021-07-19 | 2021-07-19 | Metal powder feeding mixing method for increasing capacity of binder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113547118B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4964907A (en) * | 1988-08-20 | 1990-10-23 | Kawasaki Steel Corp. | Sintered bodies and production process thereof |
| US5627258A (en) * | 1994-03-14 | 1997-05-06 | Kabushiki Kaisha Komatsu Seisakusho | Binder for use in metal powder injection molding and debinding method by the use of the same |
| CN106700191A (en) * | 2015-11-16 | 2017-05-24 | 苏州米莫金属科技有限公司 | Binder used for powder injection molding, and injection molding method |
| CN110238388A (en) * | 2019-07-26 | 2019-09-17 | 昆山卡德姆新材料科技有限公司 | A kind of metal powder and its preparation method and application wrapped up by high molecular material |
-
2021
- 2021-07-19 CN CN202110810779.3A patent/CN113547118B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4964907A (en) * | 1988-08-20 | 1990-10-23 | Kawasaki Steel Corp. | Sintered bodies and production process thereof |
| US5627258A (en) * | 1994-03-14 | 1997-05-06 | Kabushiki Kaisha Komatsu Seisakusho | Binder for use in metal powder injection molding and debinding method by the use of the same |
| CN106700191A (en) * | 2015-11-16 | 2017-05-24 | 苏州米莫金属科技有限公司 | Binder used for powder injection molding, and injection molding method |
| CN110238388A (en) * | 2019-07-26 | 2019-09-17 | 昆山卡德姆新材料科技有限公司 | A kind of metal powder and its preparation method and application wrapped up by high molecular material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113547118B (en) | 2023-08-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6562290B2 (en) | Process for the production of composite components by powder injection molding, and composite powders suitable for this purpose | |
| CN110935878A (en) | Injection molding method of titanium alloy part | |
| JP5544945B2 (en) | Granulated powder and method for producing granulated powder | |
| JP2003504518A (en) | Method of forming microporous metal member | |
| US5380476A (en) | Method of debinding for injection molded objects | |
| CN108672708B (en) | Preparation method of Mn-containing high-entropy alloy powder | |
| JP5741071B2 (en) | Granulated powder and method for producing granulated powder | |
| Pervikov et al. | Bimodal metal micro-nanopowders for powder injection molding | |
| CN113547118A (en) | Adhesive compatibilized metal powder feeding and mixing method | |
| JP5320843B2 (en) | Compound for metal powder injection molding and method for producing sintered body | |
| US5401292A (en) | Carbonyl iron power premix composition | |
| Mohamad Nor et al. | Characterisation of titanium alloy feedstock for metal injection moulding using palm stearin binder system | |
| WO2008003877A1 (en) | Process for manufacturing a masterbatch for injection moulding or for extrusion | |
| JP4093041B2 (en) | Iron-based powder mixture for powder metallurgy and method for producing the same | |
| CN109877312B (en) | Preparation method of spherical ferrite-based ODS alloy powder | |
| CN109108267B (en) | Composition, preparation method and application in field of metal injection molding material | |
| JP5544930B2 (en) | Granulated powder, porous sintered body and metal filter | |
| JP2012224885A (en) | Method for producing metal porous body | |
| JP2004332016A (en) | Granulated metal powder, manufacturing method therefor, and metal powder | |
| RU2718946C1 (en) | Method of producing granular metal-particle composition (feedstock) and composition obtained using said method | |
| JPH093510A (en) | Copper powder for injection-molding of metallic powder and production of injection-molded product using the same | |
| CN113231635A (en) | Quick-degreasing titanium powder injection molding feed and titanium product thereof | |
| JP3839626B2 (en) | Resin-containing wax spherical granules and method for producing the same, and ceramic molded body and method for producing the same | |
| Kostin et al. | Development of feedstock of tungsten-nickel-iron-polyformaldehyde for MIM technology | |
| CN115283662B (en) | Metal injection molding binder, feed and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A Method for Mixing Metal Powder Feed with Adhesive Compatibilization Granted publication date: 20230801 Pledgee: Bank of Nanjing Co.,Ltd. Taizhou Branch Pledgor: Jiangsu Jinwu New Material Co.,Ltd. Registration number: Y2024980004626 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |