Development of production manufacturing techniques for application of protective coatings to thoria dispersion strengthened alloys. Final technical report 1 Dec 1969--1 Apr 1972
Technical Report
·
OSTI ID:7119033
This program was undertaken to develop a low cost manufacturing process for applying a duplex Cr/Al coating to TD Nickel based on existing coating technology. Several methods of depositing chromium and aluminum were evaluated. These included electroplating, slurry processes and atmospheric pack. The atmospheric pack cementation process was selected as being the most economical and reliable means of depositing the duplex Cr/Al coating. Other methods such as occluded particle electroplating to deposit a chromium--nickel solid solution layer (chromizing) exhibited considerable promise, but required developmental effort outside the scope of this program. Procedures were developed for producing the duplex coating by atmospheric pack cementation on a scale-up production basis. The atmospheric pack process could repeatedly produce the desired levels of chromium and aluminum. Physical and mechanical properties of coated and uncoated TD Nickel were compared; and actual coated TD Nickel engine hardware was engine tested to obtain a comparison between the coating produced in this program and existing commercial coatings. Side-by-side environmental gas turbine engine tests indicated that the performance of the program coating was comparable to commercially available coatings. In addition to a description of the work conducted under this program, a detailed process procedure is supplied which may be used as a base for establishing a commercial production facility. (GRA)
- Research Organization:
- Pratt and Whitney Aircraft, East Hartford, CT (USA)
- OSTI ID:
- 7119033
- Report Number(s):
- AD-901796; PWA-4423
- Country of Publication:
- United States
- Language:
- English
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Mon Oct 01 00:00:00 EDT 1973
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Related Subjects
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM
CERMETS
CHROMIUM
CHROMIUM ALLOYS
COATINGS
COMPOSITE MATERIALS
CORROSION PROTECTION
DEPOSITION
DISPERSIONS
ELEMENTS
FABRICATION
GAS TURBINES
MECHANICAL PROPERTIES
METALS
NICKEL ALLOYS
PHYSICAL PROPERTIES
PROTECTIVE COATINGS
TD-NICKEL CHROMIUM
TRANSITION ELEMENTS
TURBINES
TURBOMACHINERY
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM
CERMETS
CHROMIUM
CHROMIUM ALLOYS
COATINGS
COMPOSITE MATERIALS
CORROSION PROTECTION
DEPOSITION
DISPERSIONS
ELEMENTS
FABRICATION
GAS TURBINES
MECHANICAL PROPERTIES
METALS
NICKEL ALLOYS
PHYSICAL PROPERTIES
PROTECTIVE COATINGS
TD-NICKEL CHROMIUM
TRANSITION ELEMENTS
TURBINES
TURBOMACHINERY