NDLI: Development of improved high temperature coatings for in-792 + hf

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Development of improved high temperature coatings for in-792 + hf

Content Provider	NASA Technical Reports Server (NTRS)
Author	Naik, S. K. Profant, D. D.
Copyright Year	1981
Description	The development for t-55 l712 engine of high temperature for integral turbine nozzles with improved thermal fatigue resistance without sacrificing oxidation/corrosion protection is discussed. The program evaluated to coating systems which comprised one baseline plasma spray coating (12% Al-NiCoCrALY), three aluminide coatings including the baseline aluminide (701), two CoNiCrAly (6% Al) + aluminide systems and four NiCoCrY + aluminide coating were evaluated. The two-step coating processes were investigated since it offered the advantage of tailoring the composition as well as properly coating surfaces of an integral or segmented nozzle. Cyclic burner rig thermal fatigue and oxidation/corrosion tests were used to evaluate the candidate coating systems. The plasma sprayed 12% Al-NiCoCrAlY was rated the best coating in thermal fatigue resistance and outperformed all coatings by a factor between 1.4 to 2.5 in cycles to crack initiation. However, this coatings is not applicable to integral or segmented nozzles due to the line of sight limitation of the plasma spray process. The 6% Al-CoNiCrAlY + Mod. 701 aluminide (32 w/o Al) was rated the best coating in oxidation/corrosion resistance and was rated the second best in thermal fatigue resistance.
File Size	7538608
Page Count	96
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19820006460
Archival Resource Key	ark:/13960/t9r25rz1t
Language	English
Publisher Date	1981-06-01
Access Restriction	Open
Subject Keyword	Metallic Materials Fatigue Tests Corrosion Resistance Oxidation Resistance Thermal Control Coatings T-55 Engine Heat Resistant Alloys Corrosion Tests Nozzles Thermal Fatigue Protective Coatings Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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