IT1202947B - Powder metallurgy workpieces prodn. system - in which carbon is added as necessary between annealing and compression stages before sintering - Google Patents
Powder metallurgy workpieces prodn. system - in which carbon is added as necessary between annealing and compression stages before sinteringInfo
- Publication number
- IT1202947B IT1202947B IT2388579A IT2388579A IT1202947B IT 1202947 B IT1202947 B IT 1202947B IT 2388579 A IT2388579 A IT 2388579A IT 2388579 A IT2388579 A IT 2388579A IT 1202947 B IT1202947 B IT 1202947B
- Authority
- IT
- Italy
- Prior art keywords
- powder
- temp
- sintering
- annealing
- added
- Prior art date
Links
- 238000005245 sintering Methods 0.000 title abstract 5
- 238000000137 annealing Methods 0.000 title abstract 2
- 229910052799 carbon Inorganic materials 0.000 title abstract 2
- 230000006835 compression Effects 0.000 title abstract 2
- 238000007906 compression Methods 0.000 title abstract 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title 1
- 238000004663 powder metallurgy Methods 0.000 title 1
- 239000000843 powder Substances 0.000 abstract 6
- 229910052760 oxygen Inorganic materials 0.000 abstract 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 2
- 239000002184 metal Substances 0.000 abstract 2
- 239000001301 oxygen Substances 0.000 abstract 2
- 229910000851 Alloy steel Inorganic materials 0.000 abstract 1
- 229910001315 Tool steel Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000000155 melt Substances 0.000 abstract 1
- 229910001092 metal group alloy Inorganic materials 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 238000010791 quenching Methods 0.000 abstract 1
- 229910001220 stainless steel Inorganic materials 0.000 abstract 1
- 239000010935 stainless steel Substances 0.000 abstract 1
Landscapes
- Powder Metallurgy (AREA)
Abstract
The process produces metal items by heating a metal powder consisting mainly of tool, alloy or stainless steel or a high-tensile metal alloy. The powder is produced by pulverising and water-quenching of a melt to give irregularly-shaped particles, in a vacuum of 1.0 Torr at 900 degrees C to reduce the oxygen content, followed by controlled cooling to anneal the powder. The powder is compressed into blanks of >=60% relative density, and heated in a first stage in a vacuum below the setting temp. of the powder for at least half an hour to reduce the oxygen content to 0.7%. In a second stage their temp. is increased to a sintering temp., while a vacuum or partic. atmosphere is maintained round them. Sintering continues for 0.5-4 hrs. to increase the relative density to >=93%. The items are produced to standard dimensions, giving a charge weight of >=20 kg for the blanks heated in the first two stages. Between annealing and compression the powder is analysed for C and O content, C being added as necessary. Sintering temp. is selected to suit the C content, being maintained constant within +10 deg. C during sintering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT2388579A IT1202947B (en) | 1979-06-27 | 1979-06-27 | Powder metallurgy workpieces prodn. system - in which carbon is added as necessary between annealing and compression stages before sintering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT2388579A IT1202947B (en) | 1979-06-27 | 1979-06-27 | Powder metallurgy workpieces prodn. system - in which carbon is added as necessary between annealing and compression stages before sintering |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IT7923885A0 IT7923885A0 (en) | 1979-06-27 |
| IT1202947B true IT1202947B (en) | 1989-02-15 |
Family
ID=11210640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT2388579A IT1202947B (en) | 1979-06-27 | 1979-06-27 | Powder metallurgy workpieces prodn. system - in which carbon is added as necessary between annealing and compression stages before sintering |
Country Status (1)
| Country | Link |
|---|---|
| IT (1) | IT1202947B (en) |
-
1979
- 1979-06-27 IT IT2388579A patent/IT1202947B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IT7923885A0 (en) | 1979-06-27 |
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