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1. WO1981001013 - TRAITEMENT THERMO-MECANIQUE D'ALLIAGES DE METAUX PRECIEUX DURCIS PAR DISPERSION

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

C L AI MS
1. A process for producing sheets of
dispersion-strengthened precious metal alloys comprising the step of thermomechani cal ly processing compacted
dispersion-strengthened precious metal alloys.
2. A process according to claim 1 wherein the thermomechani cal processing comprises at least one
mechanical deforming/annealing cycle and the cycles are repeated until a 50 to 90 percent reduction in area is achi eveo.
3. A process according to claim 2 wherein the mechanical deforming is rolling.
4. A process according to claims 2 or 3 wherein mechanical deforming is carried out until a 10 percent reduction in area is achieved before the compact is
annealed.
5. A process according to claim 4 wherein the reduction in area is carried out at a pressure that
elongates the compact without widening it.
C. A process according to claims 2 or 3 wherein the mechanical deforming/annealing cycles are carried out until approximately an 85 percent reduction in area is achieved.
7. A process according to claims 2 or 3 wherein the dispersion-strengthened precious metal alloy includes (1) platinum or a platinum alloy and (2) at least one metal oxide.
3. A process according to claim 7 wherein the metal oxide is yttria (Y203).
9. A process according to claim 1 wherein the dispersion-strengthened precious metal alloy is produced by mechanical alloying.
10. A process for producing sheets of
dispersion-strengthened precious metal alloys comprising a series of rolling/annealing cycles wherein each annealing step is carried cut for a period of time and at a
temperature sufficient to develop a specimen with a minimum creep rate.
11. A process for producing sheets of
dispersion-strengthened precious metal alloys comprising the steps of:
(1) mechanically alloying platinum powder and yttria ( Y2O 3 ) together wherein the yttria is present in effective dispersien-strengthening amounts;
(2) consolidating the resulting powder by vacuum hot pressing at elevated temperatures and pressures; and
(3) carrying out a series of
rolling/annealing cycles wherein each annealing step is carried out for a period of time and at a temperature sufficient to develop a specimen with a minimum creep rate.
12. A process according to claim 11 wherein the dispersion-strengthened precious metal alloy includes (1) platinum or a platinum alloy and (2) at least one metal ox i de .
13. A process according to claim 12 wherein the metal oxide is yttria ( Y2O 3 ) .
14. A process according to claim 13 wherein the amount of yttria ranges between 0.1 and 5.0 percent by volume.
15. A process according to claims 13 or 14 wherein the amount of yttria is 0.65 percent by volume (0.15 percent by weight) .
16. A process according to claim 11 wherein the vacuum hot pressing is carried out at a temperature of

1,450 ºC under a pressure of 5,000 psi for a time of twenty minutes and the annealing is carried out for 5 minutes at

1040°C.
17. A process according to claim 11 wherein high energy ball milling is used to achieve the mechanical alloying.

AMENDED CLAIMS
(received by the International Bureau on 20 November 1980 (20.11.1980))
CLAIMS
1. (Amended) A process for producing sheets of dispersion-strengthened precious metal alloys comprising the step of theππomechanically processing compacted
dispersion-strengthened precious metal alloys, wherein the dispersion-strengthened precious metal alloys are produced by mechanical alloying.
2. A process according to claim 1 wherein the thermomechani cal processing comprises at least one
mechanical deforming/annealing cycle and the cycles are repeated until a 50 to 90 percent reduction in area is achieved.
3. A process according to claim 2 wherein the mechanical deforming is rolling.
4. A process according to claims 2 cr 3 wherein mechanical deforming is carried out until a 10 percent reduction in area is achieved before the compact is
annealed.
5. A process according to claim 4 wherein the reduction in area is carried out at a pressure that
εloncr.tes the compact without widening it.
6. A process according to claims 2 or 3 wherein the mechanical dεfon-'.i ng/anr.εal i ng cycles ere carried out until approximately an 85 percent reduction in area is ac hi eved.
7. A process according to claims 2 or 3 wherein the dispersion-strengthened precious metal alloy includes (1) pl atinu m or a platinum alloy and (2) at least one metal oxide.

8. A process according to claim 7 wherein the metal oxide is yttria (Y203).
9. (Cancelled)
10. ( Am ended) A process for producing sheets of dispersion-strengthened precious metal alloys comprising a series of rolling/annealing cycles wherein each annealing step is carried out for a period of time and at a
temperature sufficient to develop a specimen with a minimum creep rata, wherein the precious metal alloys are produced by mechanical alloying.
11. (Amended) A process for producing sheets of dispersion-strengthened precious metal alloys comprising the steps of:
(1) mechanically alloying platinum powder and at leεst one dispersoid together wherein the dispersoid is present in effective dispersien-strengthening amounts;
(2) consolidating the resulting powder by vacuum hot pressing at elevated temperatures and pressures; and
(3) carrying out a series of
rolling/annealing cycles wherein each annealing step is carried cut for a period of time and at a temperature sufficient to develop a specimen with a minimum creep rate.
12. A process according to claim 11 wherein the dispersion-strengthened precious metal alloy includes (1) platinum or a platinum alloy and (2) at least one metal oxide.
13. A process according to claim 12 wherein the metal oxide is yttria ( Y2O 3 ) .
14. A process according to claim 13 wherein the amount of yttria ranges between 0.1 and 5.0 percent by volume.
15. A process according to claims 13 or 14 wherein the amount of yttria is 0.65 percent by volume (0.15 percent by weight).

16. A process according to claim 11 wherein the vacuu.ii hot pressing is carried out at a temperature of 1,450 C under a pressure of 5,000 psi for a time of twenty minutes and the annealing is carried out for 5 minutes a 104C°C.
17. A process according to claim 11 wherein high energy ball milling is used to achieve the mechanical alloying.
18. (New) A process according to claim 7 wherein the metal oxide is present in amounts ranging between 0.1 and 5.0 percent by volume.
19. (New) A process according to claim 18 wherein the amount of metal oxide is 0.65 percent by
volume.