US2872311A - Poweder metal compacts - Google Patents
Poweder metal compacts Download PDFInfo
- Publication number
- US2872311A US2872311A US546830A US54683055A US2872311A US 2872311 A US2872311 A US 2872311A US 546830 A US546830 A US 546830A US 54683055 A US54683055 A US 54683055A US 2872311 A US2872311 A US 2872311A
- Authority
- US
- United States
- Prior art keywords
- powder
- compacts
- stainless steel
- poweder
- compact
- 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
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
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
- C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
Definitions
- This invention relates to the production of powder metal compacts and is more particularly concerned with the production of such compacts from stainless steel powder.
- stainless steel powder has added thereto a quantity of fine nickel powder with a suitable lubricant.
- the stainless steel powder is mixed with from 5 to 30% of fine nickel powder, 1% of paraffin Wax and 030m 0.7% of calcium stearate.
- the particle size of the nickel powder should be small, preferably passing through a 300 mesh sieve.
- the resultant green compact had a density of approximately 6.3 grams per cubic centimetre.
- the compact when sintered at 1300 C. for one hour had a tensile strength of 22 tons per square inch, a 3% elongation, a hardness of to V. P. N. and a density of 6.37 grams per cubic centimetre.
- the compacts After sintering at 1300 C. for one hour the compacts had a tensile strength of 26 tons per square inch, a 7% elongation, a hardness of to V. P. N. and a density of 7.1 grams per cubic centimetre.
- the sintered compacts were found to be resistant to boiling dilute nitric acid, thus establishing that sufiicient diffusion of the fine nickel powder in the stainless steel composition had occurred during sintering to ensure that the compacts were essentially stainless. Further, the addition of fine nickel powder was found to have a remarkable elfect upon the compressibility of the powder mixture, enabling higher densities to be obtained at lower compacting loads.
- steps comprising adding suflicient nickel powder of aparticle size smaller than 300 mesh to stainless steel powder having a normal nickel content of 7-10% to increase the nickel content of the stainless steel powder to 12-40%, compressing the mixture of metal powders together to form a firm compact and sintering the compact at a suitable temperature to develop the full properties of the compact.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Description
United States Patent POWDER METAL 'COMPACTS Application November 14, 1955 Serial No. 546,830
1 Claim. (Cl. 75-200) No Drawing.
This invention relates to the production of powder metal compacts and is more particularly concerned with the production of such compacts from stainless steel powder.
In the production of powder metal compacts two general procedures are adopted comprising the steps of compressing and heating, a mixture of metal powders together with suitable lubricants being compressed in a mould or die to form a green compact which is then heat-treated or sintered at a suitable temperature to develop the full properties of the material.
It will be appreciated that prior to sintering some handling (mechanical or manual) of the green compact is necessary, and since stainless steel powder tends to produce compacts of a brittle nature, there is a liability of edges and corners being severely damaged. Moreover stainless steel powder is extremely difficult to compact and requires the application of very high pressing loads which cause excessive die wear to'occur.
It is therefore an object of the present invention to minimise the drawbacks mentioned by increasing the strength of green compacts made of stainless steel powder.
According to this invention in the production of powder metal compacts, stainless steel powder has added thereto a quantity of fine nickel powder with a suitable lubricant.
According to a feature of the invention the stainless steel powder is mixed with from 5 to 30% of fine nickel powder, 1% of paraffin Wax and 030m 0.7% of calcium stearate. The particle size of the nickel powder should be small, preferably passing through a 300 mesh sieve.
As an example a normal stainless steel powder of the following composition:
and of particle size distribution in the limits:
ice
Percent mesh B. S. S Nil -100+200 mesh B. S. S 75-85 -200+300 mesh B. S. S 5-15 300 mesh B. S. S 5-15 lubricated with 1% paraffin was added (in a solvent) and 0.3% calcium stearate, was compacted at 35 tons per square inch. The resultant green compact had a density of approximately 6.3 grams per cubic centimetre. The compact when sintered at 1300 C. for one hour had a tensile strength of 22 tons per square inch, a 3% elongation, a hardness of to V. P. N. and a density of 6.37 grams per cubic centimetre.
When however according to the invention 20% nickel powder (smaller than 300 mesh B. S. S.) was added to the aforesaid normal composition and compacted under the same conditions, the resultant green compact had an increased density of 6.7 grams per cubic centimetre, giving adequate strength for handling prior to sintering.
After sintering at 1300 C. for one hour the compacts had a tensile strength of 26 tons per square inch, a 7% elongation, a hardness of to V. P. N. and a density of 7.1 grams per cubic centimetre. The sintered compacts were found to be resistant to boiling dilute nitric acid, thus establishing that sufiicient diffusion of the fine nickel powder in the stainless steel composition had occurred during sintering to ensure that the compacts were essentially stainless. Further, the addition of fine nickel powder was found to have a remarkable elfect upon the compressibility of the powder mixture, enabling higher densities to be obtained at lower compacting loads.
What we claim is:
The method of producing powder metal compacts from stainless steel powder for increasing the strength of the unsintered compact and for providing a sintered product of greater tensile strength and hardness, the
steps comprising adding suflicient nickel powder of aparticle size smaller than 300 mesh to stainless steel powder having a normal nickel content of 7-10% to increase the nickel content of the stainless steel powder to 12-40%, compressing the mixture of metal powders together to form a firm compact and sintering the compact at a suitable temperature to develop the full properties of the compact.
References Cited in the file of this patent UNITED STATES PATENTS 2,214,104 Hildabo1t et al. Sept. 10, 1940 2,377,882 Hensel et a1. June 12, 1945 2,677,610 Evans May 4, 1954 2,801,916 Harris et a1. Aug. 6, 1957 FOREIGN PATENTS 424,282 Great Britain Feb. 18, 1935 625,397 Great Britain June 27, 1949
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US546830A US2872311A (en) | 1955-11-14 | 1955-11-14 | Poweder metal compacts |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US546830A US2872311A (en) | 1955-11-14 | 1955-11-14 | Poweder metal compacts |
Publications (1)
Publication Number | Publication Date |
---|---|
US2872311A true US2872311A (en) | 1959-02-03 |
Family
ID=24182204
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US546830A Expired - Lifetime US2872311A (en) | 1955-11-14 | 1955-11-14 | Poweder metal compacts |
Country Status (1)
Country | Link |
---|---|
US (1) | US2872311A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3196007A (en) * | 1962-06-12 | 1965-07-20 | Brush Beryllium Co | Beryllium copper composition and method of producing green compacts and sintered articles therefrom |
US3264720A (en) * | 1964-09-11 | 1966-08-09 | Lambert H Mott | Porous metal articles of differential permeability |
US3295937A (en) * | 1962-05-31 | 1967-01-03 | Gen Electric | Titanium ceramic composite bodies |
US3297439A (en) * | 1963-11-18 | 1967-01-10 | Abex Corp | Simultaneous sinter bond and nitride for powdered material and backing assembly |
US3325259A (en) * | 1964-05-13 | 1967-06-13 | Bethlehem Steel Corp | Ferrous base with nickel-iron coating |
US3940269A (en) * | 1968-07-10 | 1976-02-24 | Minnesota Mining And Manufacturing Company | Sintered austenitic-ferritic chromium-nickel steel alloy |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB424282A (en) * | 1933-08-18 | 1935-02-18 | Hardy Metallurg Company | Process for making stainless iron or steel alloys |
US2214104A (en) * | 1938-05-20 | 1940-09-10 | Gen Motors Corp | Porous metal article |
US2377882A (en) * | 1942-08-11 | 1945-06-12 | Mallory & Co Inc P R | Bearing |
GB625397A (en) * | 1947-07-30 | 1949-06-27 | Birmingham Small Arms Co Ltd | Improvements in or relating to powdered metal compositions |
US2677610A (en) * | 1951-10-24 | 1954-05-04 | Universal Cyclops Steel Corp | High temperature alloy steel and articles made therefrom |
US2801916A (en) * | 1954-08-24 | 1957-08-06 | Jessop William & Sons Ltd | Ferrous alloys for high temperature use |
-
1955
- 1955-11-14 US US546830A patent/US2872311A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB424282A (en) * | 1933-08-18 | 1935-02-18 | Hardy Metallurg Company | Process for making stainless iron or steel alloys |
US2214104A (en) * | 1938-05-20 | 1940-09-10 | Gen Motors Corp | Porous metal article |
US2377882A (en) * | 1942-08-11 | 1945-06-12 | Mallory & Co Inc P R | Bearing |
GB625397A (en) * | 1947-07-30 | 1949-06-27 | Birmingham Small Arms Co Ltd | Improvements in or relating to powdered metal compositions |
US2677610A (en) * | 1951-10-24 | 1954-05-04 | Universal Cyclops Steel Corp | High temperature alloy steel and articles made therefrom |
US2801916A (en) * | 1954-08-24 | 1957-08-06 | Jessop William & Sons Ltd | Ferrous alloys for high temperature use |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3295937A (en) * | 1962-05-31 | 1967-01-03 | Gen Electric | Titanium ceramic composite bodies |
US3196007A (en) * | 1962-06-12 | 1965-07-20 | Brush Beryllium Co | Beryllium copper composition and method of producing green compacts and sintered articles therefrom |
US3297439A (en) * | 1963-11-18 | 1967-01-10 | Abex Corp | Simultaneous sinter bond and nitride for powdered material and backing assembly |
US3325259A (en) * | 1964-05-13 | 1967-06-13 | Bethlehem Steel Corp | Ferrous base with nickel-iron coating |
US3264720A (en) * | 1964-09-11 | 1966-08-09 | Lambert H Mott | Porous metal articles of differential permeability |
US3940269A (en) * | 1968-07-10 | 1976-02-24 | Minnesota Mining And Manufacturing Company | Sintered austenitic-ferritic chromium-nickel steel alloy |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3836355A (en) | Steel powder containing phosphorus | |
JPH04231404A (en) | Method for powder metallurgy by means of optimized two-times press-two-times sintering | |
JPH0432122B2 (en) | ||
US2746741A (en) | Apparatus for the production of wrought metal shapes from metal powder | |
JP7395635B2 (en) | iron-based powder | |
US2872311A (en) | Poweder metal compacts | |
US3158473A (en) | Method for producing composite bodies | |
US3120436A (en) | Powdered metal article and method of making | |
KR890014774A (en) | Method for producing flat articles from metal powders and alloy plates produced by the method | |
GB625364A (en) | Improvements relating to light metal bodies and methods of manufacturing the same | |
DE1204204C2 (en) | Process for densifying materials in particulate form | |
US3573204A (en) | Method of fabricating high strength,self-lubricating materials | |
US3293006A (en) | Powdered copper metal part and method of manufacture thereof | |
US2789901A (en) | Method of making high density sintered parts | |
JP2539246B2 (en) | Sintered alloy bearing material and manufacturing method thereof | |
US1556658A (en) | Bearing material | |
US2807542A (en) | Method of making high density sintered alloys | |
US4169730A (en) | Composition for atomized alloy bronze powders | |
US3196007A (en) | Beryllium copper composition and method of producing green compacts and sintered articles therefrom | |
US3158472A (en) | Process for producing sintered articles | |
CA2248447C (en) | Boric acid-containing lubricants for powdered metals, and powdered metal compositions containing said lubricants | |
US5466414A (en) | Process for fabrication of sintered metal components | |
JPH07500633A (en) | Powder metallurgy composition with good soft magnetic properties | |
US3250838A (en) | Techniques for compacting aluminum powder mixtures | |
US3453103A (en) | Method of sintering nickel-bronze articles |