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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Duhl; David N.
Address:
Newington, CT
No. of patents:
22
Patents:












Patent Number Title Of Patent Date Issued
6355117 Nickel base superalloy single crystal articles with improved performance in air and hydrogen March 12, 2002
Compositional requirements and processing improvements are disclosed which improve the hydrogen embrittlement resistance and the fatigue resistance in air of nickel base single crystal articles. The compositional requirements enlarge the difference between the .gamma.' solvus tempera
6054096 Stable heat treatable nickel superalloy single crystal articles and compositions April 25, 2000
Improved compositions for fabricating nickel superalloy single crystal articles are described. The compositions are characterized by the substantial absence of carbon, boron, zirconium and vanadium and intentional additions of cobalt. The cobalt additions increase the stability of th
6007645 Advanced high strength, highly oxidation resistant single crystal superalloy compositions having December 28, 1999
A superalloy composition and single crystal articles of the composition are disclosed. The broad range, in weight percent, is 3.0-20.0% Co, 5.0-10.0% W, 5.0-7.0% Al, 0.4-2.9% Cr, 4.0-8.0% Ta, 0-1.0% V, 0-8.5% Re, 0-1.5% Ti, 0-3.0% Hf, 0-4.0% Mo, 0-2.0% Nb, 0-10.0% of one or more elements
5660649 Method of making oxidation resistant single crystal superalloy castings August 26, 1997
Single crystal superalloy castings are described which have excellent oxidation resistance. The oxidation resistance is due to the presence of small but effective amounts of magnesium in the casting. Single crystal castings containing magnesium in the range of 5-200 parts per million, by
5540789 Oxidation resistant single crystal superalloy castings July 30, 1996
Single crystal superalloy castings are described which have excellent oxidation resistance. The oxidation resistance is due to the presence of small but effective amounts of magnesium in the casting. Single crystal castings containing magnesium in the range of 5-200 parts per million, by
5346563 Method for removing sulfur from superalloy articles to improve their oxidation resistance September 13, 1994
Superalloy articles are made more oxidation resistant by a process which includes heat treating the article in the presence of foreign chemical species, at a temperature at which the foreign chemical species reacts with and modifies any oxide film present on the article surface. The heat
5068084 Columnar grain superalloy articles November 26, 1991
An article exhibiting superior mechical properties and resistance to oxidation corrosion at elevated temperatures as described. The article has particular utility in gas turbine engines and is comprised of a nickel base superalloy consisting essentially of 3-10% Cr, 12.1-16% Co, 1.0-1.9%
4915907 Single crystal articles having reduced anisotropy April 10, 1990
The anisotropy typically observed in single crystal nickel base superalloys is reduced by intentionally adding certain small amounts of carbon, boron, zirconium or hafnium, either individually or in combination, to the alloy composition.
4908183 High strength single crystal superalloys March 13, 1990
Nickel base superalloys having properties equal to or better than alloys currently used in gas turbine engines are described. Preferably, the alloys of the present invention are cast into single crystals.
4888069 Nickel base superalloys having low chromium and cobalt contents December 19, 1989
Single crystal nickel base superalloys, having low chromium and cobalt contents are described. The alloys have a unique combination of aluminum, tantalum, and rhenium, which results in surprisingly good oxidation and corrosion resistance, and a melting point in excess of 2500.degree. F.
4801513 Minor element additions to single crystals for improved oxidation resistance January 31, 1989
The additions of minor additions of hafnium and silicon and mixtures thereof to nickel base superalloy single crystal articles provide significantly improved oxidation resistance. The oxidation resistance is improved both for the case of uncoated articles and in the case where a prot
4719080 Advanced high strength single crystal superalloy compositions January 12, 1988
A superalloy composition and single crystal articles of the composition are described. The broad range is 3-12% Cr, 0-3% Mo, 3-10% W, 0-5% Re, 6-12% Ta, 4-7% Al, 0-15% Co, 0-0.045% C, 0-0.02% B, 0-0.1% Zr, 0-0.8% Hf, 0-2% Nb, 0-1% V, 0-0.7% Ti, 0-10% (Ru+Rh+Pd+Os+Ir+Pt), balance essentia
4597809 High strength hot corrosion resistant single crystals containing tantalum carbide July 1, 1986
Corrosion resistant, high strength, superalloy single crystal articles are described. Starting with a nominal composition of 11.75% Cr, 9% Co, 1.75% Mo, 4.5% W, 2.5% Ta, 2.5% Al, 4% Ti, balance essentially nickel, intentional additions are made of carbon and extra tantalum. From 0.05
4569824 Corrosion resistant nickel base superalloys containing manganese February 11, 1986
Nickel base superalloys intended for use at low to moderate temperatures are provided with improved corrosion resistance by the addition of from 0.2 to 0.6% manganese. The manganese addition also improves the creep properties of the alloys. The manganese modified alloys are suited for us
4512817 Method for producing corrosion resistant high strength superalloy articles April 23, 1985
Single crystal superalloy articles of a composition similar to that of IN-939 are given a combined coating and heat treatment cycle. The cycle includes a solution treatment step, a coating application step, a post coating treatment at a temperature above the gamma prime solvus and one or
4492672 Enhanced microstructural stability of nickel alloys January 8, 1985
The microstructural stability of nickel base alloys at high temperatures is nhanced by the addition of cobalt within the range of 10.0 to 14.9 weight percent for reducing the precipitation of the sigma phase in alloys with more than 12 weight percent chromium. The nickel-base alloys havin
4402772 Superalloy single crystal articles September 6, 1983
A specific composition range and process sequence are described for the production of single crystal superalloy articles which have an exceptional combination of high temperature mechanical properties and resistance to oxidation and hot corrosion. The nominal composition is 6% Ta, 9% Cr,
4371404 Single crystal nickel superalloy February 1, 1983
A specific composition range and process sequence are described for the production of single crystal superalloy articles which have an exceptional combination of high temperature mechanical properties and resistance to oxidation and hot corrosion. The nominal composition in weight percen
4222794 Single crystal nickel superalloy September 16, 1980
A specific composition range and process sequence are described for the production of single crystal superalloy articles which have an exceptional combination of high temperature mechanical properties and resistance to oxidation and hot corrosion. The nominal composition is 5.2% Cr, 5.4%
4209348 Heat treated superalloy single crystal article and process June 24, 1980
Nickel base superalloy single crystal articles formed of a particular compositon and heat treated are described as is the process employed. The resultant articles are substantially free from the grain boundary strengtheners such as carbon, boron, and zirconium and contain only a limi
4152488 Gas turbine blade tip alloy and composite May 1, 1979
A nickel base superalloy having a composition which provides a desirable combination of good oxidation and corrosion resistance and hot hardness is described. The alloy contains 21-25% Cr, 4.5-7% Al, 4-10% W, 2.5-7% Ta, 0.5-0.15% Y and 0.1-0.3% C. This alloy is useful as a blade tip elem
4116723 Heat treated superalloy single crystal article and process September 26, 1978
Nickel base superalloy single crystal articles formed from an alloy family and heat treated are described as is the process employed. The articles are substantially free from cobalt and the grain boundary strengtheners such as carbon, boron, and zirconium. The heat treatment process










 
 
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