US3827863A - Thermal and abrasion resistant sintered alloy - Google Patents
Thermal and abrasion resistant sintered alloy Download PDFInfo
- Publication number
- US3827863A US3827863A US00286393A US28639372A US3827863A US 3827863 A US3827863 A US 3827863A US 00286393 A US00286393 A US 00286393A US 28639372 A US28639372 A US 28639372A US 3827863 A US3827863 A US 3827863A
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- US
- United States
- Prior art keywords
- alloy
- sintered
- thermal
- cobalt
- iron
- 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
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Classifications
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- 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
- C22C33/0242—Making ferrous alloys by powder metallurgy using the impregnating technique
-
- 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%
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12014—All metal or with adjacent metals having metal particles
- Y10T428/1216—Continuous interengaged phases of plural metals, or oriented fiber containing
- Y10T428/12167—Nonmetal containing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12014—All metal or with adjacent metals having metal particles
- Y10T428/1216—Continuous interengaged phases of plural metals, or oriented fiber containing
- Y10T428/12174—Mo or W containing
Definitions
- a publicly known metal such as chromium, cobalt, tungsten, etc. has not only a large abrasion resistance but also is prominent in its characteristics at elevated temperatures and is applied in various fields.
- a metal has many problems to be solved when it is used as sintered parts for a machine. That is, such a metal has a high melting point so that the sintering temperature is, of necessity, required to be elevated and the sintering time has to be extended, and, therefore, it is naturally disadvantageous in cost.
- FIG. 1 is a graph showing the hardness at elevated temperatures of sintered alloys of Examples 1 and 2 and on a conventionally cast iron and a sintered iron alloy.
- FIG. 2 is a graph showing the abrasion resistance of sintered alloys of Examples 1 and 2 and of a conventionally cast iron and a sintered iron alloy.
- the sintered alloy of the present invention is obtained by adding 15 to 25% of special alloy powder consisting of, by weight, 1 to 3% of carbon, 55 to 65% of chrmium, 25 to 30% of tungsten and to 20% of cobalt to a powdery composition mainly composed of iron and containing carbon, nickel and molybdenum, and compression-molded the resulting powdery composition mainly composed of iron and comprising, by weight, 0.6 to 2% of carbon, 1 to 3% of nickel, 0.3 to 1.5% of molybdenum, to of chromium, 5 to 15% of cobalt and 3 to 7% of tungsten under a pressure of 3 to 6 ton/ cm. and sintering it in an atmosphere at 1120 to 1170 C. for 30 to 60 minutes.
- Nickel strengthens the base structure of the alloy and improves the thermal resistance and abrasion resistance. However, the effect is small with a nickel content of less than 1%, while, when it is more than 3%, the base structure locally turns to martensite so that the hardness increases unnecessarily and the structure and the hardness lose uniformity.
- Molybdenum increases the tenacity of alloy as well as the impact strength and endurance limit, and, on the other hand, improves the heat treatment property and stabilizes the structure after sintering and further possesses a synergistic effect, with other elements. However, there is no elfect with less than 0.3% of molybdenum and even with more than 1.5% no increase in eifect corresponding to the increase is not obtained.
- alloy powder 15 to 25 of alloy powder are selected and chromium, cobalt and tungsten are established at 10 to 15%, 5 to 15% and 3 to 7%, respectively.
- the amount of lead impregnated has been experimentally confirmed to be preferably within the range of 0.05 to 5% by weight. That is, with less than 0.05% the effect of impregnation is not remarkable and the impregnation of more than 5% of lead involves a problem in strength from the relation with the density of material before impregnation.
- EXAMPLE 1 18% of a special alloy powder (150 mesh) comprising 0.74% of graphite powder (325 mesh), 1.08% of carbonyl nickel powder (250 mesh), 0.35% (as molybdenum) of ferro-molybdenum powder (150 mesh), 55 to 65% of chromium, 25 to 30% of tungsten and 5 to 20% of cobalt were added to reduced iron powder mesh) as iron powder (at this time, the actual chromium content was 10.8%, tungsten 5.4% and cobalt 1.8% Then, cobalt powder mesh) was added thereto so that the cobalt content became 5.5% and further 1% of zinc stearate was added and mixed as a lubricant.
- a special alloy powder 150 mesh
- graphite powder 325 mesh
- carbonyl nickel powder 250 mesh
- 0.35% as molybdenum
- ferro-molybdenum powder 150 mesh
- cobalt powder mesh was added thereto so that the cobalt content became 5.5% and further 1%
- the mixture was molded under a pressure of 4 ton/cm. and sintered at 1120 to 1170 C. in an atmosphere of decomposed ammonium gas.
- This sintered material had a density of 6.5 g./cm. and a hardness on the Rockwell B scale of 94'.
- EXAMPLE 2 A sample was prepared by adding 2.3% of the special alloy powder under the same conditions as described in Example 1 and then the sample was impregnated with molten lead. The final composition of the sample was 1.71% of carbon, 2.83% of nickel, 1.33% of molybdenum, 14.1% of chromium, 7.0% of tungsten and 14.2% of cobalt and the lead content after lead impregnation was 3.8%.
- the sintered material had a density of 6.7 g./cm. and a hardness on the Rockwell B scale of 96.
- FIGS. 1 and 2 show the results of measuring the hardness at elevated temperatures and abrasion using a valve sheet abrasion testing machine (number of rotation 3000 rpm, spring pressure 35 kg, valve velocity at the time of valve closing 0.5 rn./sec., width of valve 1 mm., test repeating 3 number 8x10 material SUI-1 31 B) on the sintered alloy of Examples 1 and 2 in comparison with a conventionally known cast iron and sintered ferro alloy.
- the sintered alloy of the present invention was higher in hardness at elevated temperatures in comparison with the conventionally known cast iron and sintered ferro iron, and was excellent in hardness characteristics.
- the conventionally known cast iron and sintered ferro alloy had peaks at 300 C. and 400 C., respectively, and the sintered alloy of the present invention was lower in abrasion and very stable at elevated temperatures.
- the compositions of the conventionally known cast iron and sintered ferro alloy were as follows:
- the sintered alloy of the present invention is advantageous in cost, and excellent in thermal and abrasion resistance with improved sintering time -by alloying chromi- References Cited UNITED STATES PATENTS 3,471,343 10/1969 Koehler -125 3,495,957 2/1970 Matoba et al 29182.l 2,662,010 12/1953 Ahles 75123 J 2,562,543 7/1951 Gippert 75123 K BENJAMIN R. PADGETT, Primary Examiner B. HUNT, Assistant Examiner US. Cl. X.R.
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- 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 |
---|---|---|---|
JP46066981A JPS5113093B2 (de) | 1971-09-02 | 1971-09-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3827863A true US3827863A (en) | 1974-08-06 |
Family
ID=13331691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00286393A Expired - Lifetime US3827863A (en) | 1971-09-02 | 1972-09-05 | Thermal and abrasion resistant sintered alloy |
Country Status (3)
Country | Link |
---|---|
US (1) | US3827863A (de) |
JP (1) | JPS5113093B2 (de) |
DE (1) | DE2243195A1 (de) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3977838A (en) * | 1973-06-11 | 1976-08-31 | Toyota Jidosha Kogyo Kabushiki Kaisha | Anti-wear ferrous sintered alloy |
US4049429A (en) * | 1973-03-29 | 1977-09-20 | The International Nickel Company, Inc. | Ferritic alloys of low flow stress for P/M forgings |
US4123265A (en) * | 1974-02-21 | 1978-10-31 | Nippon Piston Ring Co., Ltd. | Method of producing ferrous sintered alloy of improved wear resistance |
US4327156A (en) * | 1980-05-12 | 1982-04-27 | Minnesota Mining And Manufacturing Company | Infiltrated powdered metal composite article |
US4422875A (en) * | 1980-04-25 | 1983-12-27 | Hitachi Powdered Metals Co., Ltd. | Ferro-sintered alloys |
US4808226A (en) * | 1987-11-24 | 1989-02-28 | The United States Of America As Represented By The Secretary Of The Air Force | Bearings fabricated from rapidly solidified powder and method |
GB2370281A (en) * | 2000-10-27 | 2002-06-26 | Nippon Piston Ring Co Ltd | Iron-based sintered alloy for valve seats |
US20240209905A1 (en) * | 2014-03-28 | 2024-06-27 | Keystone Powdered Metal Company | Two-way clutch assembly |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50101205A (de) * | 1974-01-12 | 1975-08-11 | ||
JPS5530063B2 (de) * | 1974-03-07 | 1980-08-08 | ||
JPS51112409A (en) * | 1975-03-29 | 1976-10-04 | Nippon Piston Ring Co Ltd | Sintered iron alloy materials for internal combustion engines |
JPS59114170U (ja) * | 1983-01-21 | 1984-08-01 | 新井 慧次 | 野球の打撃練習用軸足固定具 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1009425A (en) * | 1961-11-30 | 1965-11-10 | Birmingham Small Arms Co Ltd | Improvements in or relating to metal powders and articles produced therefrom |
-
1971
- 1971-09-02 JP JP46066981A patent/JPS5113093B2/ja not_active Expired
-
1972
- 1972-09-01 DE DE2243195A patent/DE2243195A1/de active Pending
- 1972-09-05 US US00286393A patent/US3827863A/en not_active Expired - Lifetime
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4049429A (en) * | 1973-03-29 | 1977-09-20 | The International Nickel Company, Inc. | Ferritic alloys of low flow stress for P/M forgings |
US3977838A (en) * | 1973-06-11 | 1976-08-31 | Toyota Jidosha Kogyo Kabushiki Kaisha | Anti-wear ferrous sintered alloy |
US4123265A (en) * | 1974-02-21 | 1978-10-31 | Nippon Piston Ring Co., Ltd. | Method of producing ferrous sintered alloy of improved wear resistance |
US4422875A (en) * | 1980-04-25 | 1983-12-27 | Hitachi Powdered Metals Co., Ltd. | Ferro-sintered alloys |
US4552590A (en) * | 1980-04-25 | 1985-11-12 | Hitachi Powdered Metals Co. Ltd. | Ferro-sintered alloys |
US4327156A (en) * | 1980-05-12 | 1982-04-27 | Minnesota Mining And Manufacturing Company | Infiltrated powdered metal composite article |
US4808226A (en) * | 1987-11-24 | 1989-02-28 | The United States Of America As Represented By The Secretary Of The Air Force | Bearings fabricated from rapidly solidified powder and method |
GB2370281A (en) * | 2000-10-27 | 2002-06-26 | Nippon Piston Ring Co Ltd | Iron-based sintered alloy for valve seats |
US20240209905A1 (en) * | 2014-03-28 | 2024-06-27 | Keystone Powdered Metal Company | Two-way clutch assembly |
Also Published As
Publication number | Publication date |
---|---|
JPS4832711A (de) | 1973-05-02 |
DE2243195A1 (de) | 1973-03-15 |
JPS5113093B2 (de) | 1976-04-24 |
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