RAJEEV V NAIK
Engineers in Yorktown, VA
License number
Virginia 0402025811
Issued Date
Jan 26, 1995
Expiration Date
Jan 31, 2009
Category
Professional Engineer License
Type
Professional Engineer
Address
Address
Yorktown, VA
Professional information
Reinforced Ceramic Shell Mold And Method Of Making Same
US Patent:
6364000, Apr 2, 2002
Filed:
Sep 23, 1997
Appl. No.:
08/935846
Inventors:
Rajeev V. Naik - Yorktown VA
John Corrigan - Yorktown VA
John Corrigan - Yorktown VA
Assignee:
Howmet Research Corporation - Whitehall MI
International Classification:
B22C 900
US Classification:
164516, 164517, 164518, 164519, 164122, 164411
Abstract:
A ceramic investment shell mold is reinforced with a carbon based fibrous reinforcement having an extremely high tensile strength that increases as the mold temperature is increased especially within the range of casting temperatures employed for casting large directionally solidified industrial gas turbine components. The carbon based fibrous reinforcement is wrapped or otherwise positioned around the repeating ceramic slurry/stucco layers forming the intermediate thickness of the shell mold wall. The reinforced shell mold can be used to cast large directionally solidified industrial gas turbine components with accurate dimensional control.
Reinforced Ceramic Shell Mold And Method Of Making Same
US Patent:
6568458, May 27, 2003
Filed:
Oct 30, 2001
Appl. No.:
10/022470
Inventors:
Rajeev V. Naik - Yorktown VA
John Corrigan - Yorktown VA
John Corrigan - Yorktown VA
Assignee:
Howmet Research Corporation - Whitehall MI
International Classification:
B22C 904
US Classification:
164361, 164519, 164411
Abstract:
A ceramic investment shell mold is reinforced with a carbon based fibrous reinforcement having an extremely high tensile strength that increases as the mold temperature is increased especially within the range of casting temperatures employed for casting large directionally solidified industrial gas turbine components. The carbon based fibrous reinforcement is wrapped or otherwise positioned around the repeating ceramic slurry/stucco layers forming the intermediate thickness of the shell mold wall. The reinforced shell mold can be used to cast large directionally solidified industrial gas turbine components with accurate dimensional control.
Reinforced Ceramic Shell Mold And Method Of Making Same
US Patent:
6460599, Oct 8, 2002
Filed:
Oct 30, 2001
Appl. No.:
10/020490
Inventors:
Rajeev V. Naik - Yorktown VA
John Corrigan - Yorktown VA
John Corrigan - Yorktown VA
Assignee:
Howmet Research Corporation - Whitehall MI
International Classification:
B22C 904
US Classification:
1641221, 164361
Abstract:
A ceramic investment shell mold is reinforced with a carbon based fibrous reinforcement having an extremely high tensile strength that increases as the mold temperature is increased especially within the range of casting temperatures employed for casting large directionally solidified industrial gas turbine components. The carbon based fibrous reinforcement is wrapped or otherwise positioned around the repeating ceramic slurry/stucco layers forming the intermediate thickness of the shell mold wall. The reinforced shell mold can be used to cast large directionally solidified industrial gas turbine components with accurate dimensional control.
Reinforced Quartz Cores For Directional Solidification Casting Processes
US Patent:
6029736, Feb 29, 2000
Filed:
Aug 29, 1997
Appl. No.:
8/921096
Inventors:
Rajeev V. Naik - Grafton VA
John Corrigan - Tabb VA
John Corrigan - Tabb VA
Assignee:
Howmet Research Corporation - Whitehall MI
International Classification:
B22C 910
US Classification:
164132
Abstract:
A reinforced core for use in metal casting processes, especially directional solidification casting processes, comprises an elongated, thin-walled outer quartz or silica rich tubular member and a carbon base reinforcement disposed in and extending along a length of the tubular member. The carbon base reinforcement can comprise one or more graphite rods cemented together in end-to-end relation or a carbon fiber bundle. The carbon base reinforcement can include an outer carbide surface region by coating or surface reaction.
Sequential Mold Filling
US Patent:
8540010, Sep 24, 2013
Filed:
Apr 16, 2007
Appl. No.:
11/787431
Inventors:
Brian D. Przeslawski - Liberty Township OH, US
Rajeev V. Naik - Grafton VA, US
Rajeev V. Naik - Grafton VA, US
Assignee:
Howmet Corporation - Independence OH
International Classification:
B22D 35/04
US Classification:
164133, 164337
Abstract:
Method and apparatus for casting molten metal or alloy into a plurality of molds that are connected by mold ingate passages in melt flow communication to a melt supply passage which is configured in a manner to completely or partially fill the molds with the molten metal or alloy sequentially one after another. Filling of the molds in this manner provides uniform mold filling, reduces foreign matter in molds filled after the first-filled mold, and improves quality of the cast articles.