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Title: PREPARATION AND PROPERTIES OF URANIUM MONOCARBIDE CASTINGS

Abstract

Using a special arc-melting technique, sound, homogeneous 100-g cylindrical castings of UC of near stoichi ometric composition were consistently produced. In the casting process developed, UC buttons previously prepared by arc melting the elements were placed over the opening of a graphite mold in a helium-atmosphere arc furnace. When the UC button became fully molten under the arc, it dropped by gravity into the mold. The densities of the resultant castings were about 95% of theoretical. The castings could be successfully machine ground using a water-base cutting fluid. In a preliminary determination of some physical properties of cast UC, the thermal conductivity measured at 100, 400, and 700 deg C was 0.060, 0.053, and 0.060 cal/(sec)(cm)(C), respectively. The mean linear- thermal-expansion coefficient in the temperature range from 20 to 95o deg C was 11.4 x 10/sup -6/ per C. Cast UC encapsuled in stainless steel exhibited good resistance to thermal stress and shock in two series of tests of 100 thermal cycles to 90WC and 100 cycles to 1100 deg C. Heat treating a casting specimen for 1 hr at 1000 deg C produced no significant change in microstructure, but after a subsequent exposure of 1 hr at 1500 degmore » C hardening and the appearance of the U/sub 2/C/sub 3/ phase were evident. In tests of compressive strength on a single specimen rupture occurred at 54,500 psi. (auth)« less

Authors:
; ;
Publication Date:
Research Org.:
Battelle Memorial Inst., Columbus, Ohio
OSTI Identifier:
4279680
Report Number(s):
BMI-1309
NSA Number:
NSA-13-004692
DOE Contract Number:  
W-7405-ENG-92
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-59
Country of Publication:
United States
Language:
English
Subject:
METALLURGY AND CERAMICS; CANNING; CARBON; CASTING; CONFIGURATION; CYLINDERS; DENSITY; ELECTRIC ARCS; EXPANSION; FAILURES; FURNACES; GRAPHITE; HEAT TREATMENTS; HELIUM; HIGH TEMPERATURE; IMPACT SHOCK; INERT GASES; LATTICES; LIQUID METALS; MACHINING; MATERIALS TESTING; MEASURED VALUES; MELTING; PELLETS; PHASE DIAGRAMS; POROSITY; PREPARATION; PRESSURE; STABILITY; STAINLESS STEELS; TEMPERING; THERMAL CONDUCTIVITY; THERMAL STRESSES; URANIUM CARBIDES; WATER; WEIGHT

Citation Formats

Secrest, A.C. Jr., Foster, E.L., and Dickerson, R.F. PREPARATION AND PROPERTIES OF URANIUM MONOCARBIDE CASTINGS. United States: N. p., 1959. Web. doi:10.2172/4279680.
Secrest, A.C. Jr., Foster, E.L., & Dickerson, R.F. PREPARATION AND PROPERTIES OF URANIUM MONOCARBIDE CASTINGS. United States. doi:10.2172/4279680.
Secrest, A.C. Jr., Foster, E.L., and Dickerson, R.F. Thu . "PREPARATION AND PROPERTIES OF URANIUM MONOCARBIDE CASTINGS". United States. doi:10.2172/4279680. https://www.osti.gov/servlets/purl/4279680.
@article{osti_4279680,
title = {PREPARATION AND PROPERTIES OF URANIUM MONOCARBIDE CASTINGS},
author = {Secrest, A.C. Jr. and Foster, E.L. and Dickerson, R.F.},
abstractNote = {Using a special arc-melting technique, sound, homogeneous 100-g cylindrical castings of UC of near stoichi ometric composition were consistently produced. In the casting process developed, UC buttons previously prepared by arc melting the elements were placed over the opening of a graphite mold in a helium-atmosphere arc furnace. When the UC button became fully molten under the arc, it dropped by gravity into the mold. The densities of the resultant castings were about 95% of theoretical. The castings could be successfully machine ground using a water-base cutting fluid. In a preliminary determination of some physical properties of cast UC, the thermal conductivity measured at 100, 400, and 700 deg C was 0.060, 0.053, and 0.060 cal/(sec)(cm)(C), respectively. The mean linear- thermal-expansion coefficient in the temperature range from 20 to 95o deg C was 11.4 x 10/sup -6/ per C. Cast UC encapsuled in stainless steel exhibited good resistance to thermal stress and shock in two series of tests of 100 thermal cycles to 90WC and 100 cycles to 1100 deg C. Heat treating a casting specimen for 1 hr at 1000 deg C produced no significant change in microstructure, but after a subsequent exposure of 1 hr at 1500 deg C hardening and the appearance of the U/sub 2/C/sub 3/ phase were evident. In tests of compressive strength on a single specimen rupture occurred at 54,500 psi. (auth)},
doi = {10.2172/4279680},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1959},
month = {1}
}