Alloys or metallic compositions – Nickel base
Patent
1992-03-06
1994-07-19
Dean, Richard
Alloys or metallic compositions
Nickel base
148410, 148427, 148442, 420442, 420443, 420451, 420455, 420588, C22C 1903
Patent
active
053307100
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a nickel-base alloy for a glass-contacting member used in an unenergized state and having an excellent resistance to corrosion by glass. Such a nickel-base alloy is utilized as the material of, e.g., containers for molten glass, agitators for molten glass, conduits for molten glass, guide pieces for molten glass, various rolls (rollers), dies for molding glass articles, spinners and glass blower (blowing pipe) used in producing various glass articles such as sheet glass, glass fiber, glass bottle, glass tableware, electrical glass, physicochemical glass, optical glass, glass for spectacles, filter glass, glass beads for traffic marking, glass for construction materials, glass for timepieces, glass for thermometers and glass for artistic handicrafts.
BACKGROUND ART
Examples of the glass-contacting member which have hitherto been used in contact with the above-described various glasses include a nickel-base alloy used as the material of a mold for hot-molding of glass and comprising 0.3 to 15% of chromium, 0.1 to 3% of titanium, 0.2 to 2.5% of beryllium and 1% or less of manganese (see Japanese Patent Laid-Open No. 30528/1976), an alloy used as the material of a mold for molding of glass and comprising 40 to 90% of nickel, 5 to 30% of cobalt, 1.5 to 6.5% of aluminum, optionally 3% or less of silicon and optionally 25% or less of copper with the balance consisting of iron (see Japanese Patent Laid-Open No. 58920/1978), a nickel-base alloy having an excellent resistance to corrosion by molten glass and comprising 0.2 to 25% of aluminum (see Japanese Patent Laid-Open No. 139015/1975), a nickel-titanium alloy suitable as a mold for molding of glass and comprising 50% of titanium and 50% of nickel (see Japanese Patent Laid-Open No. 79725/1973) and further Inconel 600 which is a nickel-base alloy represented by 15.5Cr-8Fe-Ni and Inconel 690 which is a nickel-base alloy represented by 29Cr-9Fe-Ni.
The above-described glass-contacting members used in producing the above-described glasses, such as rolls, molds and spinners, should be excellent in not only high-temperature strength and high-temperature oxidation resistance but also resistance to corrosion by glass during contact with molten glass, softened glass or solid phase glass. Conventional glass-contacting members, however, had problems such as poor high-temperature strength, poor resistance to oxidation at a high temperature, poor resistance to corrosion by glass, and low melting point. For example, Inconel 600 and Inconel 690, i.e., nickel-base alloys having the above-described compositions, had problems that they are not always excellent in the resistance to corrosion by glasses such as molten glass, softened glass and solid phase glass and had a melting point as low as about 1350.degree. C.
The present invention has been made in view of the above-described problems accompanying the conventional members for use in contact with glass, particularly those comprising a nickel-base alloy. An object of the present invention is to provide a nickel-base alloy which is excellent in not only high-temperature strength and high-temperature oxidation resistance but also resistance to corrosion by glass such as molten glass or solidified glass, has a melting point above 1350.degree. C., i.e., the melting point of the above-described conventional nickel-base Inconel, and is suitable as the material of a glass-contacting member used in an unenergized state.
DISCLOSURE OF THE INVENTION
The nickel-base alloy for a glass-contacting member of the present invention used in an unenergized state and having an excellent resistance to corrosion by glass is characterized by having a chemical composition comprising by weight 25 to 40% of chromium, 10 to 45% of cobalt, optionally 0.1 to 3.0% of titanium and optionally 0.01 to 0.50% of at least one element selected from among REMs (rare earth metals) with the balance consisting of nickel and unavoidable impurities.
The reason for the limitation of the chemical composition (% by wei
REFERENCES:
patent: 2162252 (1939-06-01), Grossman
patent: 3617263 (1971-11-01), Fontaine et al.
patent: 4066448 (1978-01-01), Haeberle, Jr.
patent: 4088479 (1978-05-01), Spengler
Igarashi Hiroshi
Iikubo Tomohito
Masaki Toshio
Sasaki Noriaki
Shimizu Tetsuya
Dean Richard
Doryokuro Kakunenryo Kaihatsu Jigyodan
Koehler Robert R.
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