CN108367356A - For powder injection-molded iron-based powder - Google Patents

For powder injection-molded iron-based powder Download PDF

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Publication number
CN108367356A
CN108367356A CN201680072717.4A CN201680072717A CN108367356A CN 108367356 A CN108367356 A CN 108367356A CN 201680072717 A CN201680072717 A CN 201680072717A CN 108367356 A CN108367356 A CN 108367356A
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Prior art keywords
powder
sintered
iron
raw material
density
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CN201680072717.4A
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CN108367356B (en
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A·拉松
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Hoganas AB
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Hoganas AB
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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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • B22F1/05—Metallic powder characterised by the size or surface area of the particles

Abstract

The present invention relates to for metal injection molded raw material, it includes thick powder of stainless steel and adhesive that the particle of the median particle with 20 60 μm and 99% is less than 120 μm, wherein the iron-based powder includes, by weight percentage：15 17%Cr；3 5%Ni；3 5%Cu；0.15 0.45%Nb；<1.0%Mn；<1.0%Si；Less than 0.08%C.

Description

For powder injection-molded iron-based powder
Invention field
The present invention relates to can be used for powder injection-molded iron-based powder, especially powder of stainless steel；For powder injection Molding composition；The method that sintered component is manufactured by the powder composition；With the sintered component made of the powder composition. The sintered component with 96% or more the density in theoretical density can be obtained using the powder composition, is thus generated excellent Engineering properties.
Background of invention
Powder injection-molded, also referred to as metal injection molded (MIM) is for manufacturing complex-shaped high-density sintered portion The useful technology of part.In general, using thin carbonyl iron dust in this approach.Other types of powder used is with pole Fine-grained gas atomization or water atomization, the cost is relatively high.In order to improve the competitiveness of MIM methods, it is desirable to reduce institute With the cost of powder.Realize that a kind of mode of the purpose is to utilize thicker powder.But have compared with corase meal lower than fine powder Surface energy, therefore the activity in sintering process is much lower.Another problem is that thick and irregular powder use cause compared with Low bulk density, therefore limit the maximum powder content of the raw material.Relatively low content of powder causes the relatively high convergency in sintering process And it is particularly likely to cause in production procedure the high dimensional scatter between manufactured component.
WO2012089807 discloses the use for the coarse powder for realizing the theoretical density more than 95%.There is still a need for can be achieved more Highdensity technology.
In general, the solid loadings of iron-based MIM raw materials (iron-based powder mixed with organic bond for preparing injection) are (i.e. Iron-based powder part) be about 50 volume %, it means that in order to reach after sintering high density (the 93% of theoretical density with On), green component must shrink almost 50 volume %.This is different from having obtained relatively highdensity pass through under green state PM components made of single shaft compacting.Therefore in MIM active fine powder is sintered usually using with high.By improving sintering temperature Degree, can use thicker powder.But this causes grain coarsening, and then generates the engineering properties of non-optimal.
It has been surprisingly found that can have specific composition using its metal powder in powder injection-molded raw material Metal coarse powder is to obtain at least 96% component of the sintered density as theoretical density.
It summarizes
It is an object of the present invention to provide have the relatively thick of low amounts alloying element suitable for metal injection molded Stainless steel powder powder composition.
It is a further object of the present invention to provide the metal injection comprising the relatively thick stainless steel powder powder composition at Type feedstock composition.
It is described it is a further object of the present invention to provide the method for manufacturing injection moulding sintered component by the feedstock composition The density that component has is at least the 96% of theoretical density.
Another object of the present invention is to provide 96% and higher density with theoretical density when sintering is unhardened With the tensile strength higher than 800MPa according to sintered component made of MIM methods.
At least one of these purposes is realized as follows：
It is a kind of to be used for metal injection molded iron-based powder combination, with 20-60 μm, preferably 20-45 μm, most preferably 25-45 μm or more preferably 25-35 μm of median particle.Grain is measured by using the laser diffractometry of Sympatec Helos instruments Degree.Median particle as defined above refers to 50% of the particle in the powder being more than this value.This value is commonly referred to as " X50 " Value.
A kind of metal injection molded feedstock composition, it includes with 20-60 μm, preferably 20-45 μm, most preferably 25-45 μ The atomised iron based powders composition and organic bond of the median particle of 25-35 μm of m or more preferable.
A method of manufacture sintered component comprising step：
A) metal injection molded raw material as proposed above is prepared；
B) raw material is molded as un-sintered base；
C) organic bond is removed；
D) base obtained by being sintered at a temperature of 1200-1400 DEG C in a reducing atmosphere；
E) the cooling sintered component, and；
F) rear sintering processes optionally are imposed to the component, such as precipitation-hardening, Surface hardened layer, nitriding, carburizing, nitrocarburizing (nitrocarburizing), carbo-nitriding (carbonitriding), impewdance matching, surface rolling and/or peening.
The sintered component made of the feedstock composition, the component have theoretical density at least 96% density and Tensile strength higher than 800MPa.
Detailed description of the invention
Stainless steel powder powder composition includes at least one iron-based powder and/or straight iron powder.The iron-based powder and/or straight iron powder It can be manufactured by the water atomization or gas atomization of fusant and optional alloying element.Can further reduction be imposed to atomized powder to move back Pyrogenic process, and optionally employ the further alloying of diffusion-alloying method.Alternatively, iron powder can pass through the also original manufacture of iron oxide.
The granularity of iron or iron-based powder combination is such：Median particle be 20-60 μm, preferably 20-45 μm, most preferably 25-45 μm, more preferable 25-35 μm.In addition, X99It is preferred that answering 120 μm maximum, preferably at most 100 μm of (X99It refer to 99% particle With less than X99Granularity).
Copper Cu can enhance intensity and hardness by solution hardening.Cu is also conducive to form sintering neck in sintering process, because Copper melts before reaching sintering temperature, to provide so-called liquid-phase sintering.The powder can optionally with 0-5 weight % or 3-5 Cu (preferably Cu powder types) mixing of the amount of weight %.
It can be optionally by other materials, such as hard phase material and machinability enhancing agents, such as MnS, MoS2、CaF2, variety classes Minerals etc. be added in iron-based powder combination.
Feedstock composition can be prepared by mixing above-mentioned iron-based powder combination and adhesive.
The adhesive of at least one organic bond form can be more excellent with 30-65 volume %, preferably 35-60 volumes % The concentration of 40-55 volumes % is selected to be present in feedstock composition.Also include MIM- when using term adhesive in the present specification Common other organic substances in raw material, such as releasing agent, lubricant, wetting agent, rheology modifier, dispersant.Suitably have The example of machine adhesive is wax, polyolefin, and such as polyethylene and polypropylene, polystyrene, polyethylencarbonate, gathers polyvinyl chloride Ethylene glycol, stearic acid and polyformaldehyde.
Feedstock composition is molded as base.Gained base is then heat-treated, or in a solvent processing or by other means at Reason to remove a part of adhesive as known in the art, then in a reducing atmosphere in a vacuum or decompression in big It is further sintered at a temperature of about 1200-1400 DEG C.
Can heat treatment process for example be imposed to obtain to sintered component by heat treatment and by controlled cooling rate Need micro-structure.Hardening process may include known method, as precipitation-hardening, quenching and tempering, Surface hardened layer, nitriding, carburizing, nitrogen carbon are total Ooze, carbo-nitriding, impewdance matching etc..Alternatively, the sinter-hardened method under high cooldown rate may be used.
Other types of rear sintering processes can be used, such as surface rolling or shot-peening, introduce compressive residual stress to increase Strong fatigue life.
Sintered component according to the present invention reaches at least 96% sintered density of theoretical density and the drawing higher than 800MPa Stretch intensity.
Embodiment 1
Prepare the iron-based powder combination according to table 1.
Table 1
Element A B D E C (comparison)
Cr 16.5 16.5 17 16.5 16.1
Ni 4.09 4.3 4.3 4.09 13.3
Cu 4 4.04 3.96 4
Nb 0.37 0.37 0.47 0.37
Mn 0.1 0.1 0.04 0.1 0.096
Si 0.68 0.53 0.95 0.68 0.881
Mo 2.12
C 0.016 0.079 0.011 0.016 0.022
O 0.351 0.433 0.146 0.351 0.236
N 0.04 0.025 0.021 0.04 0.044
S 0.007 0.006 0.003 0.007 0.009
Fe Bal Bal Bal Bal Bal
X10 10.9 14.2 14.4 21.4 12.2
X50 24.4 32.6 31.0 35.0 26.4
X90 46.7 57.0 52.1 56.7 46.9
x99 72.2 79.8 86.8 104.0 66.9
Embodiment 2
Composition is compacted to the density (the 58% of theoretical density) of about 4.5g/cm3, be made diameter with 25mm and The cylinder of the height of 8mm, hereafter A, C and E are in 100 volume %H2Atmosphere in be sintered 1200 minutes at 1350 DEG C.Sample C It is sintered 120 minutes at 1380 DEG C, 100%H2.Use such as standard SS-EN ISO 3369:Water displacement method described in 2010 is surveyed Measure sintered density.
Table 2 shows test result.
A C (comparison) E
SD 7.63 6.65 7.37
The % of theoretical density 98.2 83.4 95.0
Embodiment 3
By mixed-powder composition and organic bond, the raw material respectively containing metal-powder compositions A, B and D is prepared And compared with the raw material made of composition C.Adhesive is made of 47.5% polyethylene, 47.5% paraffin and 5% stearic acid.Institute There is percentage to be weight percentage.Organic bond and powder composition are with 53:47 metal powder:Adhesive volume ratio is mixed It closes.
By raw material injection moulding for according to the standard MIM tensile bars of ISO-SS EN ISO 2740.Then sample is at oneself Unsticking is then sintered 120 minutes in 100% hydrogen atmosphere at 1350 DEG C for 4 hours with removing deparaffnize at 60 DEG C in alkane.
Sintered density is measured using water displacement method.Tension test is tested according to SS EN ISO 2740.As a result it is shown in table 3 In.The value of standard alloy 17-4PH and 316L that standard value is derived from ISO22068 and is shown under sintering state.Engineering properties is made It is presented with being capable of more two different alloys for the % of standard value.
Table 3

Claims (5)

1. it is used for metal injection molded raw material, it includes：
A) iron-based powder, the particle with 20-60 μm of median particle and 99% is less than 120 μm, wherein the iron-based powder Including by weight percentage：
15-17%Cr；3-5%Ni；3-5%Cu；0.15-0.45%Nb；<1.0%Mn；<1.0%Si；Less than 0.08%C；With
B) adhesive.
2. raw material according to claim 1 is used for metal injection molded purposes.
3. purposes according to claim 2 comprising step：
A) metal injection molded raw material according to claim 1 is prepared,
B) raw material is molded as un-sintered base,
C) organic bond is removed,
D) base obtained by being sintered at a temperature of 1200-1400 DEG C in a reducing atmosphere,
E) the cooling sintered component, and
F) rear sintering processes optionally are imposed to the component, such as precipitation-hardening, Surface hardened layer, nitriding, carburizing, nitrocarburizing, carbon Nitrogen permeation, impewdance matching, surface rolling and/or peening.
4. according to sintered component made of claim 3, the density having is at least the 96% of theoretical density.
5. sintered component according to claim 4 has the tensile strength higher than 800MPa.
CN201680072717.4A 2015-10-15 2016-10-05 Iron-based powder for powder injection molding Active CN108367356B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP15189896.2A EP3156155A1 (en) 2015-10-15 2015-10-15 Iron based powders for powder injection molding
EP15189896.2 2015-10-15
PCT/EP2016/073721 WO2017063923A1 (en) 2015-10-15 2016-10-05 Iron based powders for powder injection molding

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CN109454238A (en) * 2018-11-08 2019-03-12 江苏精研科技股份有限公司 A method of engine oil pressure control valve valve pocket is prepared by injection moulding
CN111621722A (en) * 2019-02-28 2020-09-04 精工爱普生株式会社 Precipitation hardening stainless steel powder for powder metallurgy, compound, granulated powder, and precipitation hardening stainless steel sintered body
CN112481542A (en) * 2019-09-11 2021-03-12 精工爱普生株式会社 Precipitation hardening stainless steel powder, composite, granulated powder, precipitation hardening stainless steel sintered body, and method for producing same
CN112760555A (en) * 2019-10-21 2021-05-07 晟铭电子科技股份有限公司 Method for producing molded body having nitrided layer, and molded body produced thereby
CN114540710A (en) * 2020-08-04 2022-05-27 湖州慧金材料科技有限公司 Non-magnetic injection molding material G19, preparation method and application thereof in manufacturing of wearable equipment

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CN108350528B (en) 2015-09-04 2020-07-10 思高博塔公司 Chromium-free and low-chromium wear-resistant alloy
CN113195759B (en) 2018-10-26 2023-09-19 欧瑞康美科（美国）公司 Corrosion and wear resistant nickel base alloy
WO2020172744A1 (en) * 2019-02-25 2020-09-03 Rio Tinto Iron And Titanium Canada Inc. Metallic iron powder
CN114378293A (en) * 2021-09-15 2022-04-22 东莞市环力智能科技有限公司 Sintering process of austenitic stainless steel stirring head and stainless steel stirring head

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109454238A (en) * 2018-11-08 2019-03-12 江苏精研科技股份有限公司 A method of engine oil pressure control valve valve pocket is prepared by injection moulding
CN111621722A (en) * 2019-02-28 2020-09-04 精工爱普生株式会社 Precipitation hardening stainless steel powder for powder metallurgy, compound, granulated powder, and precipitation hardening stainless steel sintered body
CN111621722B (en) * 2019-02-28 2021-12-31 精工爱普生株式会社 Precipitation hardening stainless steel powder for powder metallurgy, compound, granulated powder, and precipitation hardening stainless steel sintered body
CN112481542A (en) * 2019-09-11 2021-03-12 精工爱普生株式会社 Precipitation hardening stainless steel powder, composite, granulated powder, precipitation hardening stainless steel sintered body, and method for producing same
CN112760555A (en) * 2019-10-21 2021-05-07 晟铭电子科技股份有限公司 Method for producing molded body having nitrided layer, and molded body produced thereby
CN114540710A (en) * 2020-08-04 2022-05-27 湖州慧金材料科技有限公司 Non-magnetic injection molding material G19, preparation method and application thereof in manufacturing of wearable equipment
CN114540722A (en) * 2020-08-04 2022-05-27 湖州慧金材料科技有限公司 Injection molding material G19, preparation method and application thereof in manufacturing of wearable equipment
CN114540710B (en) * 2020-08-04 2023-01-20 湖州慧金材料科技有限公司 Non-magnetic injection molding material G19, preparation method and application thereof in manufacturing of wearable equipment

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EP3156155A1 (en) 2017-04-19
ES2808207T3 (en) 2021-02-25
EP3362210A1 (en) 2018-08-22
CN108367356B (en) 2020-10-27
TW201728769A (en) 2017-08-16
DK3362210T3 (en) 2020-08-03
WO2017063923A1 (en) 2017-04-20
EP3362210B1 (en) 2020-05-06

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