EP1735477A2 - Fabrication de parties en alliages a base de fer fritte au moyen d'alliages meres renfermant du bore - Google Patents
Fabrication de parties en alliages a base de fer fritte au moyen d'alliages meres renfermant du boreInfo
- Publication number
- EP1735477A2 EP1735477A2 EP05717969A EP05717969A EP1735477A2 EP 1735477 A2 EP1735477 A2 EP 1735477A2 EP 05717969 A EP05717969 A EP 05717969A EP 05717969 A EP05717969 A EP 05717969A EP 1735477 A2 EP1735477 A2 EP 1735477A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- iron
- boron
- pressing
- density
- sintering
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- C22C33/0207—Using a mixture of prealloyed powders or a master alloy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F2003/023—Lubricant mixed with the metal powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- 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
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F2003/145—Both compacting and sintering simultaneously by warm compacting, below debindering temperature
-
- 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
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Definitions
- This invention relates to a method of making high-density (>7.0g/ml) sintered, iron-based alloy parts using boron-containing Master Alloys, and to parts produced by
- ferrophosphorous additions have been quite successful, but the resulting properties tend to be reduced by brittle networks of phosphide. Additionally, work with ferrophosphorous additions required sintering temperatures between 1290°C and 1380°C and ultrahigh carbon additions (0.8 to 2.0) to achieve near full density, as disclosed by US Patent 5,516,483. In the 1970s work in Germany on the use of MCM (metal carbide master alloys) showed great promise, but it was found that the additives, in the form of finely milled carbides of vanadium, chromium, molybdenum and manganese, were extremely abrasive and tool life was drastically degraded, making production uneconomic.
- MCM metal carbide master alloys
- a basic object of the invention is the provision of an improved method of making high-density (>7.0g/ml) sintered, iron-based alloy parts, and to parts produced by this method.
- Summary of a First Aspect of the Invention According to a first aspect of the invention, there is provided method of making high-density (>7.0g/ml) sintered, iron-based alloy parts characterised by the steps of: (i) mixing an atomised boron-containing master alloy powder, or a plurality of master alloy powders at least one . of which is boron-containing, with a conventional iron or iron alloy powder; and (ii) pressing and sintering the mix to an increased density to produce the part required.
- Summary of a Second Aspect of the Invention A second aspect of the invention is directed to high density, sintered, iron-based alloy parts produced by the above defined method. Advantages of the Invention
- the invention provides a new concept where, instead of utilising milled powders as MA additives, an atomised, essentially spherical additive is used.
- This allows the use of less hard a brittle alloys, as the atomising process does not, like milling, demand a brittle alloy be processed. It also reduces the abrasive nature of the resulting powders, as they do not have the sharp edges characteristic of a milled or ground product.
- the alloying approach adopted has also been the subject of intensive research, and MA compositions including a significant level of boron have been developed. As a result it has been possible to reach sintered densities in the range 7.2-7.8 without resorting to forging, DPDS or to extremely high sintering temperatures.
- a lubricant is added to the mix in conventional amounts as used in powder metallurgy technology.
- the lubricant is a solid.
- the lubricant is a liquid.
- the lubricant is a solid dissolved in a liquid.
- the master alloy powder(s) contains from 1-20% by wt boron.
- the master alloy powder(s) has a mean particle size from 1-30 microns, preferably under 20 microns. Sintering is effected at temperatures in the range 1050°C to 1300°C, preferably below 1200°C.
- Sintering is effected in a reducing, inert , or vacuum atmosphere. From ⁇ 6% by weight of atomised master alloy powder(s) is mixed with the conventional iron or low alloy powder.
- the pressing is cold pressing.
- the pressing is warm pressing ⁇ 300°C.
- the pressed density of the part is 6.6-7.4g/ml.
- the parts have a boron content above 0.1 % by wt.
- the parts have a density from 7.2-7.8, preferably 7.4-7.6g/ml.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0407539.6A GB0407539D0 (en) | 2004-04-02 | 2004-04-02 | Making sintered iron based alloy parts by using boron-containing master alloys |
PCT/GB2005/000904 WO2005095661A2 (fr) | 2004-04-02 | 2005-03-09 | Fabrication de parties en alliages a base de fer fritte au moyen d'alliages meres renfermant du bore |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1735477A2 true EP1735477A2 (fr) | 2006-12-27 |
Family
ID=32247768
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05717969A Withdrawn EP1735477A2 (fr) | 2004-04-02 | 2005-03-09 | Fabrication de parties en alliages a base de fer fritte au moyen d'alliages meres renfermant du bore |
Country Status (4)
Country | Link |
---|---|
US (1) | US20070292301A1 (fr) |
EP (1) | EP1735477A2 (fr) |
GB (1) | GB0407539D0 (fr) |
WO (1) | WO2005095661A2 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6309215B2 (ja) * | 2013-07-02 | 2018-04-11 | Ntn株式会社 | 焼結機械部品の製造方法及びこれに用いる混合粉末 |
WO2022083806A1 (fr) * | 2020-10-19 | 2022-04-28 | Institute Of Physics Of Materials | Procédé de consolidation de poudres par formage volumétrique |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3999952A (en) * | 1975-02-28 | 1976-12-28 | Toyo Kohan Co., Ltd. | Sintered hard alloy of multiple boride containing iron |
JPS61186454A (ja) * | 1985-02-15 | 1986-08-20 | Mitsubishi Metal Corp | 耐食性および耐摩耗性のすぐれたFe基焼結合金 |
US4861373A (en) * | 1985-07-15 | 1989-08-29 | Scm Metal Products, Inc. | Infiltrated powder metal part having improved impact strength tensile strength and dimensional control and method for making same |
US4612048A (en) * | 1985-07-15 | 1986-09-16 | E. I. Du Pont De Nemours And Company | Dimensionally stable powder metal compositions |
FR2596067B1 (fr) * | 1986-03-19 | 1991-02-08 | Metafram Alliages Fritte | Procede de fabrication de pieces en acier rapide fritte |
US5330792A (en) * | 1992-11-13 | 1994-07-19 | Hoeganaes Corporation | Method of making lubricated metallurgical powder composition |
US5872322A (en) * | 1997-02-03 | 1999-02-16 | Ford Global Technologies, Inc. | Liquid phase sintered powder metal articles |
US6485540B1 (en) * | 2000-08-09 | 2002-11-26 | Keystone Investment Corporation | Method for producing powder metal materials |
-
2004
- 2004-04-02 GB GBGB0407539.6A patent/GB0407539D0/en not_active Ceased
-
2005
- 2005-03-09 US US10/599,298 patent/US20070292301A1/en not_active Abandoned
- 2005-03-09 WO PCT/GB2005/000904 patent/WO2005095661A2/fr active Application Filing
- 2005-03-09 EP EP05717969A patent/EP1735477A2/fr not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2005095661A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2005095661A2 (fr) | 2005-10-13 |
WO2005095661A3 (fr) | 2006-08-24 |
US20070292301A1 (en) | 2007-12-20 |
GB0407539D0 (en) | 2004-05-05 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR |
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AX | Request for extension of the european patent |
Extension state: AL BA HR LV MK YU |
|
17P | Request for examination filed |
Effective date: 20070226 |
|
RBV | Designated contracting states (corrected) |
Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR |
|
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Effective date: 20100527 |