Sintering mechanism of samarium--cobalt alloys

Journal Article · Thu Nov 01 04:00:00 EST 1973 · Z. Metallk., v. 64, no. 11, pp. 771-775

OSTI ID:4308978

Gessinger, G H; de Lamotte, E

The sintering mechanism of samarium-cobalt alloys was investigated employing isothermal shrinkage measurements on pre-alloyed powders and powder mixtures in the concentration range from 23 to 42 wt.% Sm. The sintering temperatures were varied from 1,020 to 1,160 deg C. The three stoichiometric compounds Sm/sub 2/CO, SmCo/sub 5/ and Sm/sub 2/Co/sub 17/ are characterized by com paratively slow sintering behavior, whereas hypo- and hyperstoichiometric SmCo/sub 5/ exhibits maxima of shrinking at the limits of its range of homogeneity. These are due to additional cobalt and samarium vacancies. Low- melting sintering additions do not increase the shrinkage, and only above their liquidus temperature is accelerated concentration equalization of the prealloys obtained. (GE)

• Research Organization: Brown, Boveri and Co. Ltd., Baden, Switzerland
• NSA Number: NSA-29-024733
• OSTI ID: 4308978
• Journal Information: Z. Metallk., v. 64, no. 11, pp. 771-775, Journal Name: Z. Metallk., v. 64, no. 11, pp. 771-775; ISSN ZEMTA
• Country of Publication: Germany
• Language: German

Related Subjects

*COBALT ALLOYS-- SINTERING
*SAMARIUM ALLOYS-- SINTERING
DIFFUSION
INTERMETALLIC COMPOUNDS
ISOTHERMAL PROCESSES
MICROSTRUCTURE
MIXTURES
N50230* --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
POWDERS
SHRINKAGE
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
VACANCIES
VERY HIGH TEMPERATURE