Stock material or miscellaneous articles – All metal or with adjacent metals – Having metal particles
Patent
1980-12-15
1983-06-07
Lesmes, George F.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having metal particles
428457, 428678, 428937, 427 34, 427423, 75255, B22F 504
Patent
active
043871402
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a slide member which is most suitable for a slide surface of, for example piston rings, cylinder liners and air compressors for internal combustion engines.
BACKGROUND ART
Recently, increasing demands have been placed for anti-wear and anti-seizing material and low-friction material considering that light alloy need to be used and miniaturization is necessary as countermeasures for higher rotation speed, higher compression ratio, weight reduction and fuel consumption improvement for the purpose of enhancing the performance in the internal combustion engine, and extensive studies have heretofore been conducted.
So far, it has been publicly known to form a wear-resistant layer by spray-coating or plating a metal, an oxide or a carbonate onto the sliding portions of the machine parts.
The wear-resistant layer is discussed below exemplifying a piston ring. Most of the conventional surface-treated piston rings are ones obtained by plating chromium or spray-coating of molybdenum onto the outer peripheral surfaces of the steel-base piston ring member.
However, the chromium-plated piston ring exhibits poor seizing resistance relative to the cylinder liner composed of cast iron as an opponent member, and hence seizing and scuffing are liable to take place. In order to improve the above-mentioned drawback, the cylinder liners made of cast iron to which nickel, chromium, molybdenum and/or boron, and niobium are added are used. The above cast iron, however, exhibits poor workability as compared with ordinary cast irons (FC material), and hence presents another disadvantage such as increased manufacturing cost.
The piston ring onto which molybdenum is spray-coated, on the other hand, exhibits good seizing resistance with respect to the cylinder liner composed of cast iron as an opponent member. With the engines which are subjected to the thermal load of higher than 300.degree. C., however, the oxidation of molybdenum imposes problem with regard to adherence property between the piston ring member and the spray-coated layer. Moreover, molybdenum is so expensive that the piston ring eventually becomes expensive.
The present invention is to eliminate the above-mentioned defects inherent in the conventional arts, and its object is to provide a slide member which can be used for forming slide surfaces of piston rings, cylinder liners, slide surfaces of pistons, and slide surfaces of air compressors, and which is less expensive than the molybdenum spray-coated materials, and which exhibits excellent wear resistance and adherence property, and which exhibits superior scuffing resistance to the chromium-plated materials, and which can be used even under high-temperature conditions.
DISCLOSURE OF INVENTION
The present invention provides a slide member the surface onto which a spray-coating is provided by plasma spray-coating, a powdery mixture of 5 to 80% by weight (percents hereinafter are all percent by weight) of an Fe/Ni alloy based on the total amount of the powders and 95 to 20% of an Fe/high-Cr alloy powder, or preferably a powdery mixture of 10 to 70% of the Fe/Ni alloy powder and 90 to 30% of the Fe/high-Cr alloy powder.
According to the present invention which employs the Fe/Ni alloy powder mixed with the Fe/high-Cr alloy powder in combination, the resulting spray-coated layer possesses advantages of each of the alloy powders while compensating the defects thereof. Namely, the spray-coated layer of Fe/high-Cr alloy exhibits a Vickers' hardness of 830 to 1000 which is comparable to that of chrome plating, and exhibits good wear resistance itself, but causes the opponent member to be greatly worn out.
The spray-coated layer of Fe/Ni alloy, on the other hand, exhibits a Vickers' hardness of 500 to 750 and it exhibits excellent wear resistance and scuffing resistance by the formation of chromium borate, chromium carbonate and nickel silicide, and it has a low coefficient of friction. This layer, however, has a large coefficient of thermal expansion which deteriorates
REFERENCES:
patent: 3184331 (1965-05-01), Carter
patent: 3606359 (1971-09-01), McCormick
patent: 3725017 (1973-04-01), Prasse et al.
patent: 3740212 (1973-06-01), Church
patent: 4275090 (1981-06-01), McComas et al.
Fuwa Yoshio
Kondo Katsumi
Miyazaki Shoji
Buffalow E. Rollins
Lesmes George F.
Toyota Jidosha Kogyo Kabushiki Kaisha
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