GB780640A - Improvements in or relating to piston rings - Google Patents
Improvements in or relating to piston ringsInfo
- Publication number
- GB780640A GB780640A GB32023/55A GB3202355A GB780640A GB 780640 A GB780640 A GB 780640A GB 32023/55 A GB32023/55 A GB 32023/55A GB 3202355 A GB3202355 A GB 3202355A GB 780640 A GB780640 A GB 780640A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- powder
- mixture
- sintering
- metal
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
- C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
- C22C32/0026—Matrix based on Ni, Co, Cr or alloys thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
A sintered metal piston ring made by a powder metallurgical process includes 0.25 to 20 per cent by weight of hard particles of aluminium oxide. The balance of the powder mixture preferably is iron or steel in the form of 50 to 300 mesh powder, with or without 0.3 to 4 per cent finely divided graphite and 0.3 to 2 per cent of a die lubricant comprising powdered zinc stearate or stearic acid. The aluminium oxide may be in the form of fuzed alumina, "Turkish emery", corundum or tabular corundum, and may be in the form of 100 to 600 mesh powder. The mixture may be briquetted at a pressure of 20,000 to 120,000 pounds per square inch and then sintered in an inert atmosphere for 4 to 90 minutes at a temperature of 1900 to 2300 DEG F. according to the nature of the metal. A two-stage sintering also is described. The inert atmosphere may comprise a mixture of 20 per cent CO, 3 per cent H, and 77 per cent N, or a mixture of 1.5 per cent CO, 1-5 per cent H, and 97 per cent N. After sintering, the metal may be hot or cold worked to improve its tensile strength and reduce its porosity to between 2 and 13 per cent. This may be followed by a tempering treatment for 30 to 60 minutes at a temperature between 800 and 1100 DEG F., and a surface-treatment e.g. with iron-manganese phosphate. Instead of briquetting under high pressure before sintering, the powder may be loosely filled into a mould and may contain a relatively small amount of one ingredient having a lower melting point than the main ingredient.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US780640XA | 1954-12-29 | 1954-12-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB780640A true GB780640A (en) | 1957-08-07 |
Family
ID=22141705
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB32023/55A Expired GB780640A (en) | 1954-12-29 | 1955-11-09 | Improvements in or relating to piston rings |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB780640A (en) |
-
1955
- 1955-11-09 GB GB32023/55A patent/GB780640A/en not_active Expired
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