GB1121189A - A method of treating iron powder - Google Patents

A method of treating iron powder

Info

Publication number
GB1121189A
GB1121189A GB8520/66A GB852066A GB1121189A GB 1121189 A GB1121189 A GB 1121189A GB 8520/66 A GB8520/66 A GB 8520/66A GB 852066 A GB852066 A GB 852066A GB 1121189 A GB1121189 A GB 1121189A
Authority
GB
United Kingdom
Prior art keywords
powder
iron powder
treating iron
coldworking
compressibility
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.)
Expired
Application number
GB8520/66A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoganas Billesholms AB
Original Assignee
Hoganas Billesholms AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hoganas Billesholms AB filed Critical Hoganas Billesholms AB
Publication of GB1121189A publication Critical patent/GB1121189A/en
Expired legal-status Critical Current

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
    • C22C33/0235—Starting from compounds, e.g. oxides
    • 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
    • B22F1/14—Treatment of metallic powder
    • B22F1/145—Chemical treatment, e.g. passivation or decarburisation

Abstract

A method of treating iron powder to increase its compressibility, comprises the steps of coldworking the powder to form a powder aggregate, pulverizing the aggregate to reduce the particle size, oxidizing the powder thus obtained to an H2-loss value of between 1% and 10% and then reducing the powder in hydrogen. The coldworking is performed by rolling and while this operation alone increases the compressibility of the powder obtained by the subsequent pulverizing, it also reduces the green strength of the compact. By oxidizing the powder, preferably to an H2-loss value of 5% and then reducing it in dry hydrogen at 960 DEG C. for 60 mins., the green strength is increased again. After reduction the particle size is reduced to less than 0.15 m.m.
GB8520/66A 1965-03-09 1966-02-25 A method of treating iron powder Expired GB1121189A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE307965 1965-03-09

Publications (1)

Publication Number Publication Date
GB1121189A true GB1121189A (en) 1968-07-24

Family

ID=20261360

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8520/66A Expired GB1121189A (en) 1965-03-09 1966-02-25 A method of treating iron powder

Country Status (3)

Country Link
US (1) US3462260A (en)
ES (1) ES323935A1 (en)
GB (1) GB1121189A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3997341A (en) * 1974-10-17 1976-12-14 Universal Oil Products Company Reduced temperature sintering process
US4464206A (en) * 1983-11-25 1984-08-07 Cabot Corporation Wrought P/M processing for prealloyed powder
US4464205A (en) * 1983-11-25 1984-08-07 Cabot Corporation Wrought P/M processing for master alloy powder

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2558750A (en) * 1943-07-19 1951-07-03 Walter F Courtis Production of divided metals
US2902357A (en) * 1954-06-11 1959-09-01 Republic Steel Corp Increasing the density of iron powder by alternate rolling and grinding
US2853767A (en) * 1955-03-23 1958-09-30 Mallory & Co Inc P R Method of making high density ferrous alloy powder compacts and products thereof

Also Published As

Publication number Publication date
US3462260A (en) 1969-08-19
ES323935A1 (en) 1966-12-16

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