Title

Development of a Powder and/or Gas Cementation Process for Coating Molybdenum Alloys for High Temperature Protection

Index Abstract

Not Available

Photo Quality

Complete

Report Number

ML TDR 64-74

Index Price

$0.00

Report Availability

Full text available

Creator

Nyack, W.

Date

1964

Extent

87

Corporate Author

Chromalloy Corporation

Laboratory

Air Force Materials Laboratory

Identifier

AD0603021

AD0603021

Contract

AF 33(616)-7383

DoD Project

7381

DoD Task

738102

Access Rights

OTS

Distribution Classification

1

Date Issued

1964-06

Abstract

As prepared W-2 coating on Mo-0.5Ti was found to be essentially MoSi2. Upon exposure at 2700°F. the coating becomes three phase and develops an oxidation resistant glaze.
A statistically designed experiment was run on two levels of each of nine process variables in order to optimize the W-2 coating process. This experiment indicated that the three most important process variables were time and temperature of processing and mixing of the coating powders. Soundness of the Mo-0.5Ti surface and acid etching of the surface were of secondary importance. Purity, particle size and age of powder mixture and retort material were, statistically, minor in importance.
The recommended optimum coating would be produced by processing uncontaminated surface Mo-0.5Ti etched and honed. The work piece should be immersed in a commercial purity, -60 plus 150 mesh powder that is well mixed. The work should be processed twice (12 hours at temperature each time) at 1900°F. in a steel retort. The coating produced should have a wear life of 47 hours and a standard deviation of 8 hours at 2700°F. under the oxidation conditions used in this program.

Type

report

Provenance

Lockheed Martin Missiles & Fire Control

Format

1 online resource (ix, 77 pages) : ill.

Subject

MOLYBDENUM ALLOYS

REFRACTORY METAL ALLOYS

COATINGS

PHASE STUDIES

DIFFUSION

OXIDATION

ENVIRONMENTAL TESTS

PROCESSING

TUNGSTEN

TITANIUM ALLOYS

SILICIDES

HIGH TEMPERATURE

MANUFACTURING

TIME

THICKNESS

POWDERS

TEMPERATURE

MIXTURES

IMPURITIES

HARDNESS

MICROSTRUCTURE

PARTICLE SIZE

AGING (MATERIALS)

SURFACE PROPERTIES

LIFE EXPECTANCY (SERVICE LIFE)

FRACTURE (MECHANICS)

REFRACTORY COATINGS

Publisher

Wright-Patterson Air Force Base, OH : Research and Technology Division, Air Force Systems Command, United States Air Force

Date Modified

Scanned by request 4/7/2022 submitted by University of Tehran (University - International)

Distribution Conflict

No

DTIC Record Exists

Yes