CN111014641A - High-fluidity polyoxymethylene binder for metal injection molding and preparation method of feed thereof - Google Patents
High-fluidity polyoxymethylene binder for metal injection molding and preparation method of feed thereof Download PDFInfo
- Publication number
- CN111014641A CN111014641A CN201811175326.2A CN201811175326A CN111014641A CN 111014641 A CN111014641 A CN 111014641A CN 201811175326 A CN201811175326 A CN 201811175326A CN 111014641 A CN111014641 A CN 111014641A
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- China
- Prior art keywords
- binder
- injection molding
- metal injection
- polyformaldehyde
- feed
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Classifications
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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
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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
- 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
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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
- 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
Abstract
The invention relates to the technical field of powder metallurgy, and particularly discloses a polyformaldehyde-based binder for metal injection molding and a feeding preparation method thereof, wherein the binder is prepared from the following raw materials in parts by mass: 75-90% of polyformaldehyde, 5-15% of polyethylene and 1-10% of flow aid. The method for preparing the feed comprises the steps of adding metal powder and a binder into a kneader according to a certain proportion for mixing, and then carrying out extrusion granulation through a single-screw extruder to obtain the granular feed. The binder disclosed by the invention is low in viscosity and good in flowability, has good mold filling capacity during injection molding, reduces the defects of green bodies, and effectively improves the yield.
Description
Technical Field
The invention belongs to the technical field of powder metallurgy, and particularly relates to a binder for metal injection molding and a preparation method of a feed thereof.
Background
Metal Injection Molding (MIM) is a new powder metallurgy near-net-shape forming technology combining powder metallurgy technology and plastic injection molding technology, in which a blank can be injection-molded by using a mold, and then a structural component with high density, high dimensional accuracy and complex geometric shape can be rapidly manufactured by sintering, the design concept can be rapidly and accurately materialized into a product with specific structure and function, and the product can be directly produced in batch. The product is widely applied to the industrial fields of electronic information engineering, biomedical equipment, automobiles, machinery, hardware, aerospace and the like.
The binder is the core of MIM technology and its main role is to provide powder flowability during injection molding and to maintain the green shape during the steps prior to sintering. The binder determines the properties of the feed and thus the quality of the whole process. Feedstock enters and fills the mold by injection molding, during which the rheological properties of the feedstock play a critical role. In the polyformaldehyde-based binder, the viscosity of polyformaldehyde is high, the prepared feeding rheological property is poor, and the defects of insufficient injection, cracks and the like of a green body can be caused, so that the yield is greatly reduced. For the problem of poor feeding rheological property, the existing solution generally increases the fluidity of the feeding material by adding a lubricant, but cannot effectively improve the rheological property of the feeding material.
Therefore, in order to improve the rheological properties of the feedstock, reduce green defects, and increase green yield, it is necessary to develop a high-fluidity polyoxymethylene-based binder.
Disclosure of Invention
The invention aims to: provides a polyformaldehyde-based binder for metal injection molding and a feeding preparation method thereof, so as to improve the rheological property of the feeding, reduce the defects of a green body and improve the yield of the green body.
The polyformaldehyde-based binder is designed to achieve the purpose and has good rheological property. The adhesive consists of polyformaldehyde, polyethylene and a flow aid, and the mass fractions of the components are as follows: 75-90% of polyformaldehyde, 5-15% of polyethylene and 1-10% of flow aid.
Wherein the polyformaldehyde is homo-polyformaldehyde with MIF more than or equal to 50, the polyethylene is one or two of low-density polyethylene or high-density polyethylene, and the flow aid is one of stearic acid, polytetrahydrofuran or modified ethylene bis-fatty acid amide or one of stearic acid and polytetrahydrofuran or modified ethylene bis-fatty acid amide.
A preparation method of a feed of a high-fluidity polyoxymethylene binder for metal injection molding comprises the following steps:
1) mixing: adding metal powder and the binder in claim 1 into a kneader according to a certain proportion for mixing, wherein the mixing temperature is 185-195 ℃, the rotating speed is 40-50r/min, and the mixing time is 3-4 h;
2) and (3) extrusion granulation: and extruding the mixed mixture through a single-screw extruder at the extrusion temperature of 180 ℃ and 190 ℃, and granulating after extrusion to obtain the feed.
Compared with the prior art, the invention has the following beneficial effects:
1. the rheological property of the feeding is obviously improved, and the uniformity of the feeding is improved.
2. The proportion of occurrence of under-injection and cracks of the green body is reduced, and the yield is improved.
In the binder system, the three flow aids can effectively improve the uniformity and rheological property of the feed, and simultaneously reduce the injection temperature, thereby reducing the defects of the feed in the injection molding process and improving the production efficiency.
Detailed Description
The polyformaldehyde-based binder for metal injection molding disclosed by the invention comprises the following raw materials in percentage by mass: 75-90% of polyformaldehyde, 5-15% of polyethylene and 1-10% of flow aid. The specific embodiment is as follows:
example 1:
a polyformaldehyde-based binder for 17-4PH stainless steel metal injection molding and a feeding preparation method thereof comprise the following steps:
1) the used binder comprises the following components in percentage by mass: 85% of homopolymerized formaldehyde, 12% of high-density polyethylene and 3% of polytetrahydrofuran. Adding 17-4PH stainless steel powder with the volume percentage of 58 percent and 42 percent of binder into a kneader, and mixing at the temperature of 190 ℃ and the rotating speed of 45r/min for 3.5 h.
2) And extruding the mixture by a single-screw extruder at the extrusion temperature of 185 ℃, and granulating the mixture after extrusion to obtain the feed.
The 17-4PH stainless steel feed prepared by the invention has the temperature of 190 ℃ and the shear rate of 1000s-1The viscosity, the non-Newtonian index, the viscous flow activation energy and the comprehensive rheology factor are respectively 253.09 pas, 0.42 and 21.71kJ mol-1、10.58×10-7And has better rheological property.
Example 2:
a polyformaldehyde-based binder for 17-4PH stainless steel metal injection molding and a feeding preparation method thereof comprise the following steps:
1) the used binder comprises the following components in percentage by mass: 85% of homopolymerized formaldehyde, 12% of high-density polyethylene and 5% of modified ethylene bis fatty acid amide. Adding 17-4PH stainless steel powder with the volume percentage of 58 percent and 42 percent of binder into a kneader, and mixing at the temperature of 190 ℃ and the rotating speed of 45r/min for 3.5 h.
2) And extruding the mixture by a single-screw extruder at the extrusion temperature of 185 ℃, and granulating the mixture after extrusion to obtain the feed.
The 17-4PH stainless steel feed prepared by the invention has the temperature of 185 ℃ and the shear rate of 965s-1Under the condition, the viscosity, the non-Newtonian index, the viscous flow activation energy and the comprehensive rheological factor are respectively 192.48Pa · s, 0.415, 28.72, 6.567 × 10-7And has better comprehensive rheological property.
Example 3:
a polyformaldehyde-based binder for Fe-Cu-C porous materials and a feeding preparation method thereof comprise the following steps:
1) the used binder comprises the following components in percentage by mass: 89% of homopolymerized formaldehyde, 9% of high-density polyethylene and 2% of stearic acid. Adding 58 percent of metal powder and 42 percent of binder into a kneader, mixing at 195 ℃, rotating at 45r/min and mixing for 3 h.
2) And extruding the mixture by a single-screw extruder at the extrusion temperature of 190 ℃, and granulating the mixture after extrusion to obtain the feed.
The feed prepared by the invention has the temperature of 185 ℃ and the shear rate of 1961s-1Viscosity, non-Newtonian index,Viscous flow activation energy and comprehensive rheology factors are 207.55 Pa.s, 0.46 and 40.89 kJ.mol respectively-1、5.29×10-7And has better rheological property.
Claims (5)
1. The polyformaldehyde-based binder for metal injection molding is characterized by comprising the following raw materials in percentage by mass: 75-90% of polyformaldehyde, 5-15% of polyethylene and 1-10% of flow aid.
2. The binder for metal injection molding according to claim 1, wherein the polyoxymethylene is polyoxymethylene and MIF is not less than 50.
3. The metal injection molding binder according to claim 1, wherein the polyethylene is one or a combination of low density polyethylene and high density polyethylene.
4. The binder for metal injection molding according to claim 1, wherein the flow aid is one of stearic acid, polytetrahydrofuran, and modified ethylene bis-fatty acid amide, or a mixture of stearic acid and one of polytetrahydrofuran and modified ethylene bis-fatty acid amide.
5. A method for preparing a feedstock for metal injection molding, the method comprising the steps of:
(1) mixing: adding metal powder and the binder in claim 1 into a kneader according to a certain proportion for mixing, wherein the mixing temperature is 185-195 ℃, the rotating speed is 40-50r/min, and the mixing time is 3-4 h;
(2) and (3) extrusion granulation: and extruding the mixed mixture through a single-screw extruder at the extrusion temperature of 180 ℃ and 190 ℃, and granulating after extrusion to obtain the feed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811175326.2A CN111014641A (en) | 2018-10-10 | 2018-10-10 | High-fluidity polyoxymethylene binder for metal injection molding and preparation method of feed thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811175326.2A CN111014641A (en) | 2018-10-10 | 2018-10-10 | High-fluidity polyoxymethylene binder for metal injection molding and preparation method of feed thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111014641A true CN111014641A (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811175326.2A Pending CN111014641A (en) | 2018-10-10 | 2018-10-10 | High-fluidity polyoxymethylene binder for metal injection molding and preparation method of feed thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105728730A (en) * | 2016-04-08 | 2016-07-06 | 玉溪大红山矿业有限公司 | Stainless steel-based feedstock for injection molding and preparation method thereof |
| CN106270522A (en) * | 2016-09-23 | 2017-01-04 | 江西悦安超细金属有限公司 | A kind of for metal injection molded feeding and preparation method thereof |
| DE102016011717A1 (en) * | 2015-10-02 | 2017-04-20 | Meotec GmbH & Co. KG | Component, method for producing a component and apparatus for producing three-dimensional components |
| CN108315598A (en) * | 2018-04-20 | 2018-07-24 | 长沙聚众冶金科技有限公司 | A kind of preparation method of IN713C nickel base superalloys |
-
2018
- 2018-10-10 CN CN201811175326.2A patent/CN111014641A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016011717A1 (en) * | 2015-10-02 | 2017-04-20 | Meotec GmbH & Co. KG | Component, method for producing a component and apparatus for producing three-dimensional components |
| CN105728730A (en) * | 2016-04-08 | 2016-07-06 | 玉溪大红山矿业有限公司 | Stainless steel-based feedstock for injection molding and preparation method thereof |
| CN106270522A (en) * | 2016-09-23 | 2017-01-04 | 江西悦安超细金属有限公司 | A kind of for metal injection molded feeding and preparation method thereof |
| CN108315598A (en) * | 2018-04-20 | 2018-07-24 | 长沙聚众冶金科技有限公司 | A kind of preparation method of IN713C nickel base superalloys |
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Application publication date: 20200417 |
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