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Title:
METHOD FOR PRODUCING DISPERSION STRENGTHENED METAL PRODUCTS
Document Type and Number:
WIPO Patent Application WO/2001/096622
Kind Code:
A1
Abstract:
The invention concerns a method for producing elongated dispersion strengthened metal alloy products. A surface oxidised metal alloy powder is provided in a pipe, wherein the metal alloy powder is an alloy of a matrix metal and at least one solute metal having a negative energy of oxide formation exceeding that of the matrix metal. The powder in the pipe is compacted and the powder-containing pipe is extruded into an elongated product, while simultaneously being internally oxidised, and is thereafter subjected to an elevated temperature to complete the internal oxidation.

Inventors:
WIREN SVEN (SE)
JERREGAARD LARS (SE)
JONASON BENGT (SE)
Application Number:
PCT/SE2001/001340
Publication Date:
December 20, 2001
Filing Date:
June 13, 2001
Export Citation:
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Assignee:
ELEKTROKOPPAR AB (SE)
WIREN SVEN (SE)
JERREGAARD LARS (SE)
JONASON BENGT (SE)
International Classes:
C22C1/10; (IPC1-7): C22C1/10
Domestic Patent References:
WO1986006871A11986-11-20
Foreign References:
EP0023640A11981-02-11
DE2355122A11975-05-07
DE1446364A11969-03-20
GB962479A1964-07-01
GB898497A1962-06-14
US6254660B12001-07-03
Attorney, Agent or Firm:
AWAPATENT AB (Box 5117 Malmö, SE)
Download PDF:
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Claims:
CLAIMS
1. A method for producing dispersion strengthened metal alloy products comprising the steps of: a) providing a surface oxidised metal alloy powder in a pipe, wherein the metal alloy powder is an alloy of a matrix metal and at least one solute metal having a negative energy of oxide formation exceeding that of the matrix metal; b) compacting the powder in the pipe; c) extruding the powder containing pipe into an elongated product, thereby increasing the product tem perature starting an internal oxidation; d) and subjecting the extruded product to an eleva ted temperature to complete the internal oxidation.
2. Method according to claim 1, wherein the powder containing pipe is produced by: a) pouring the surface oxidised metal alloy powder into an elongated, preferably Ushaped, foil of a matrix metal; b) sealing the foil, enclosing the metal alloy pow der, to form a pipe.
3. Method according to claim 2, wherein the thick ness of the foil is 0, 0010, 2 times the radius of the pipe to be formed.
4. Method according to claim 1, 2 or 3, wherein the metal alloy powder is an alloy of a matrix metal and at least one solute metal having a negative energy of oxide formation exceeding that of the matrix metal with at least 200 kJ per gram of oxygen at 25°C.
5. Method according to any one of the claims 14, wherein the same metal is used in the pipe or foil as in the matrix of the metal alloy powder.
6. Method according to any one of the claims 15, wherein the extrusion causes the product temperature to increase to 4001050°C, preferably 500800°C.
7. Method according to any one of the claims 16, wherein the product is subjected to an elevated tem perature in a nonoxidising atmosphere for 1 second15 minutes, preferably 1 second2 minutes and most prefera bly 1 second1 minute.
8. Method according to any one of the claims 17, wherein the metal alloy powder is produced by gas atomi sation.
9. Method according to any one of the claims 18, wherein the particle size of the surface oxidised alloy powder is at least 10 m, preferably at least 30 J, m and less than 200 m, preferably less than 150 pm.
10. Method according to any one of the claims 19, wherein the matrix metal is Cu, Ag or Ni and the solute metal Al, Mg, Zr, Be or Si.
11. Method according to any one of the claims 110, wherein the solute metal is present in the alloy in the proportion of 0, 016% by weight, preferably 0, 11, 0% by weight of the alloy.
12. A method according to any one of the claims 111, wherein the method is performed continuously.



 
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