The standard Gibbs free energy of formation of
Cr2O3
,
normalΔG°ffalse(Cr2O3false)
, was measured using an electrochemical technique incorporating a
ThO2‐Y2O3
electrolyte. The following two cells were investigated normalCell )(I:normalCr,Cr2O3|ThO2−8 normalm/normalo YO1.5|normalCo,normalCoO
normalCell )(II:normalCr,Cr2O3|ThO2‐8 normalm/normalo YO1.5|normalMn,normalMnO
normalΔG°ffalse(Cr2O3false)
calculated from emf results for the above two cells are in good agreement, also in close agreement with a previous study of the
normalCr‐Cr2O3
equilibrium by the gas equilibration technique. The results of the present investigation lead to the following expression for the standard Gibbs free energy of formation of
Cr2O3
ΔG°fnormalCr2O3=−266,600+59.78T±350 cal1150°–1540°K
The General Klectric Company iK engaged in a major program of dovelopin;',, dcsi};ni"S anc ' ni.TniifacLnri.ng a larf;e riiiporconfluct". inft magnet in support of the Large Coil Program, which if; f mid oil by the U.S. Department of Energy aru! directed by the Oak Ridge Nation^] Laboratory. The: oval: ;!i:iped toroidal, in.ignei; vcighs approximately 'VJ7'kH, with hrirc d iamr-.tor;; of 3.35m and 2.35m; and is designed for a maximum magnetic field of 8T at: 30.65 kA. Limi tat ion:; on naf.net weight and available apace for .structural component;; coupled with extremely large magnetic force.. 1 , presented a major challenge in the selection of a mutable structural material. Detailed considerations of de;;ign and fabrication requirements of the coil resulted in the selection of Type 3161,M stainless stc^ol for major structural components. In support of the magnet development effort, an extensive test program was initiated to verify expected base metal properties, to develop weld processes and to establish weld and base metal design allowables. This paper presents the results of the test program which involved testing and evaluation of 25mm thick Type 316LN plate, shielded metal arc weld (SMAK) deposits selected for structural welds, gas tungsten arc t>/e.ld (GTAU) and gas metal arc weld (GMAW) deposits selected for seal welds. The welding development eEfort including measurements of impact properties at RT and 77K; chemical analyses; measurements of magnetic permeabilities and weld ferrite contents, metallographic and radiographic examinations of welds were performed at the Materials and
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