US3853642A - Process for making sintered iron base shaped bodies containing copper and tin with a tempering step followed by slow cooling - Google Patents
Process for making sintered iron base shaped bodies containing copper and tin with a tempering step followed by slow cooling Download PDFInfo
- Publication number
- US3853642A US3853642A US00293374A US29337472A US3853642A US 3853642 A US3853642 A US 3853642A US 00293374 A US00293374 A US 00293374A US 29337472 A US29337472 A US 29337472A US 3853642 A US3853642 A US 3853642A
- Authority
- US
- United States
- Prior art keywords
- cooling
- temperature
- tempering
- sintering
- tin
- 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 - Lifetime
Links
- 238000005496 tempering Methods 0.000 title claims abstract description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 18
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 12
- 239000010949 copper Substances 0.000 title claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims description 17
- 238000010583 slow cooling Methods 0.000 title description 4
- 238000001816 cooling Methods 0.000 claims abstract description 43
- 238000005245 sintering Methods 0.000 claims abstract description 35
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 239000007791 liquid phase Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- 241000282485 Vulpes vulpes Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
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
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
Definitions
- Sintered shaped bodies are made of a pulverulent mixture of tin, copper and predominantly iron by sintering the mixture in which tin is present in an amount between 0.5 and 4.5%, copper is present in an amount of 0.3 to 7%, balance iron, and wherein the ratio of tin to copper is between 1 2 0.7 and 1 1.5.
- the formed sintered body is then cooled to for instance room temperature and thereafter subjected to a tempering treatment at a temperature between 750 and 600C followed by cooling to room temperature.
- the cooling after the heat treatment and preferably also the cooling after sintering are effected at a slow rate at least within the range between 750 and 300C, that is, at a rate not exceeding 15C per minute.
- the invention resides in the fact that the shaped parts after sintering are subjected to a heat treatment in the range of between about 750 and 600C and that furthermore and rate of cooling following the heat treatment is slow and particularly is slow in the range between 750 and 300C.
- the cooling rate should not exceed the speed of 15C per minute.
- the heat or tempering treatment is of a duration of at least minutes. Particularly good values for the tensile strength and the elongation to fracture are obtained if the cooling speed does not exceed C per minute at any place in the range between 750 and 300C. It is therefore also preferable that the cooling from the sintering temperature at, e.g., between 900 and l,l00C down to the temperature of the heat treatment likewise is carried out at a slow rate and preferably at the rate which does not exceed the just indicated speed.
- the process of the invention permits obtaining shaped bodies which in addition to adequate values of tensile strength have an excellent elongation at fracture.
- Shaped bodies made by the process of the invention are therefore competitive with similar bodies made from sintered alloys in which instead of tin, nickel has been used.
- Tin alloys have the advantage over these nickel containing alloys that they can be made at a substantially lower sintering temperature. This, therefore, decreases the manufacturing cost.
- chilling when used in the Examples implies a rate of cooling at a speed in excess of 25C/min.
- Examples 2 and 4 show the lower values obtained by departing from the desired optimum operation.
- EXAMPLE 1 Sintering to the desired shape: 20 min. at 950C Cooling: to room temperature at a speed 15C/min.
- Tempering 2 hrs. at 650C Cooling at a speed: 15C/min.
- EXAMPLE 6 Sintering: as in Example 1 Cooling: to 720C at a speed 10C/min.
- Tempering 10 min. at 720C Cooling: at a speed 10C/min.
- Example 2 shows that if the cooling speed is higher after sintering, that is if at that point the rules given herein are not strictly observed even a subsequent tempering treatment and slow cooling after that treatment cannot restore the desirably high values which are for instance obtained in Example 1 and some of the other Examples.
- the values obtained are definitely lower, particularly for the elongation, if the cooling after sintering has been carried out at a high speed.
- Example 4 also shows that where a higher rate of cooling is carried out after the tempering treatment this will very substantially impair the values obtained, particularly the elongation value, irrespective of the fact that the alloy following the sintering was cooled at a slow rate, that is at a rate not exceeding C/min.
- the critical range for the cooling rate appears to be between 750 and 300C.
- a sintered shaped body comprising liquid phase sintering of a body consisting of a compacted pulverulent mixture of 0.5 to 4.5% tin, 0.3 to 7% copper, balance iron, the ratio of tin to copper being between 1 0.7 and l 1.5, so as to form a sintered body, tempering said sintered body at a tempering temperature between substantially 600 and 750C; and cooling said body from said tempering temperature to room temperature, said step of cooling being carried out at a rate of at most about l5C/min at least in the temperature range between said tempering temperature and approximately 300C.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2149147A DE2149147C3 (de) | 1971-10-01 | 1971-10-01 | Verfahren zur Nachbehandlung von Sinterkörpern aus Eisen, Kupfer und Zinn |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3853642A true US3853642A (en) | 1974-12-10 |
Family
ID=5821245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00293374A Expired - Lifetime US3853642A (en) | 1971-10-01 | 1972-09-29 | Process for making sintered iron base shaped bodies containing copper and tin with a tempering step followed by slow cooling |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3853642A (enrdf_load_stackoverflow) |
| JP (1) | JPS4842903A (enrdf_load_stackoverflow) |
| CH (1) | CH548812A (enrdf_load_stackoverflow) |
| DE (1) | DE2149147C3 (enrdf_load_stackoverflow) |
| FR (1) | FR2156623B3 (enrdf_load_stackoverflow) |
| GB (1) | GB1369313A (enrdf_load_stackoverflow) |
| IT (1) | IT968412B (enrdf_load_stackoverflow) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104583443A (zh) * | 2012-09-12 | 2015-04-29 | Ntn株式会社 | 铁系烧结金属制的机械部件 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3299429B2 (ja) * | 1995-12-13 | 2002-07-08 | 松下電器産業株式会社 | 電池用極板の乾燥装置 |
| EP2610567A1 (en) | 2003-03-26 | 2013-07-03 | Fujifilm Corporation | Drying method for a coating layer |
| JP4951301B2 (ja) | 2006-09-25 | 2012-06-13 | 富士フイルム株式会社 | 光学フィルムの乾燥方法及び装置並びに光学フィルムの製造方法 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3647573A (en) * | 1969-06-05 | 1972-03-07 | Bell Telephone Labor Inc | Method of making a bronze-iron composite |
-
1971
- 1971-10-01 DE DE2149147A patent/DE2149147C3/de not_active Expired
-
1972
- 1972-08-28 CH CH1267972A patent/CH548812A/xx not_active IP Right Cessation
- 1972-09-27 FR FR7234225A patent/FR2156623B3/fr not_active Expired
- 1972-09-28 IT IT29788/72A patent/IT968412B/it active
- 1972-09-29 JP JP47097312A patent/JPS4842903A/ja active Pending
- 1972-09-29 US US00293374A patent/US3853642A/en not_active Expired - Lifetime
- 1972-09-29 GB GB4499272A patent/GB1369313A/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3647573A (en) * | 1969-06-05 | 1972-03-07 | Bell Telephone Labor Inc | Method of making a bronze-iron composite |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104583443A (zh) * | 2012-09-12 | 2015-04-29 | Ntn株式会社 | 铁系烧结金属制的机械部件 |
| US9970086B2 (en) | 2012-09-12 | 2018-05-15 | Ntn Corporation | Machine component made of ferrous sintered metal |
| CN110042318A (zh) * | 2012-09-12 | 2019-07-23 | Ntn株式会社 | 铁系烧结金属制的机械部件 |
| US11035027B2 (en) * | 2012-09-12 | 2021-06-15 | Ntn Corporation | Machine component made of ferrous sintered metal |
| US12146208B2 (en) | 2012-09-12 | 2024-11-19 | Ntn Corporation | Machine component made of ferrous sintered metal |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2156623A1 (enrdf_load_stackoverflow) | 1973-06-01 |
| GB1369313A (en) | 1974-10-02 |
| DE2149147A1 (de) | 1973-04-05 |
| DE2149147C3 (de) | 1978-10-12 |
| IT968412B (it) | 1974-03-20 |
| DE2149147B2 (de) | 1978-02-16 |
| CH548812A (de) | 1974-05-15 |
| JPS4842903A (enrdf_load_stackoverflow) | 1973-06-21 |
| FR2156623B3 (enrdf_load_stackoverflow) | 1975-10-17 |
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