DEVELOPMENT AND PRODUCTION OF IMPROVED MOLYBDENUM SHEET BY POWDER METALLURGY TECHNIQUES. Interim Report No. 3 for March 1, 1960-April 30, 1960

Technical Report · Sun May 01 00:00:00 EDT 1960

OSTI ID:4108744

Nelson, R C; Bargainnier, R B; Wurms, C

With the exception of elevated-temperature tests, the evaluation of dispersion hardening agents added to molybdenum by dry blending was completed. Of the three refractory oxides added in various concentrations by weight TiO/sub 2/ raised the recrystallization temperature by 100/sup o/F over that obtained with ZrO/sub 2 and Al2/O/sub 3/ additions. These latter additions apparently had no effect on raising the recrystallization temperature above that of unalloyed molybdenum. Icreasing percentages of oxide additions had an inverse effect on room temperature formability of as-rolled sheet. A stress-relief anneal improved formability. Wet-doping methods (22 variations) of adding dispersion hardening agents are in process based on the purest raw material paramolybdate. In addition to the three additives mentioned previously, ThO/sub 2/, Cr/sub 2/O/sub 3/, Ti, and ZrO/sub 2/ + Ti are under investigation. In the development of process specifications, the effect of variations in sintered density on edge cracldng in sheet was illustrated. The sintered density of the slab prior to rolling apparently had no effect on the control of finished sheet properties. The finished sheet properties were a result of the rolling schedule. The trend reported previously, that sintered density increased with increasing slab size, was shown to exist. However, since the variations were small and with those experienced from lot to lot, the study was discontin ued. Further work was done on unalloyed molybdenum in optimizing the rolling procedure and setting up test equipment for material evaluation. In the powder-rolling feasibility study, some 5- to 10-mil molybdenum sheet was produced which had room-temperature propertles comparable to sheet produced by standard techniques. Investigation continued on finding an optimum metal powder, proper rolling speeds and powder flow, sintering, and rerolling. Further attempts were made at producing a Mo-0.5% Ti alloy by adding TiHi/sub 2//sub ./ (auth)

• Research Organization: Sylvania Electric Products Inc. Chemical and Metallurgical Div., Towanda, Penna.
• DOE Contract Number: NOAS 60-6018-C
• NSA Number: NSA-15-004270
• OSTI ID: 4108744
• Report Number(s): AD-238003
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-61
• Country of Publication: United States
• Language: English

Related Subjects

METALS, CERAMICS, AND OTHER MATERIALS
ADDITIVES
ALUMINUM OXIDES
ANNEALING
CHROMIUM OXIDES
CRACKS
DENSITY
DISPERSIONS
EFFICIENCY
ENRICHMENT
HARDNESS
HIGH TEMPERATURE
MIXING
MOLYBDENUM
MOLYBDENUM ALLOYS
MOLYBDENUM OXIDES
PHASE DIAGRAMS
PLATES
POWDER METALLURGY
PRODUCTION
RECRYSTALLIZATION
REFRACTORIES
ROLLING
SHEETS
SINTERED MATERIALS
STANDARDS
TENSILE PROPERTIES
THORIUM OXIDES
TITANIUM
TITANIUM ALLOYS
TITANIUM HYDRIDES
TITANIUM OXIDES
ZIRCONIUM OXIDES