MOUND LABORATORY PROGRESS REPORT FOR AUGUST 1962
1 8 ; < 9 8 8 ; 8 ; 8 7 8 tics led to the developmert of glass-filled diallyl phthalate as a molding powder. The glass- filled formulation has a greater shock resistance than the asbestos-filled plastic. The molding characteristics of the glass-filled material were very good, but a new technique for inspection is required, since bright spots on the x ray films from the orientntion of the glass fibers appeared as high density inclusions. The effect of the initial curve temperature on Oxiron adhesives is being studied. By properly controlling the initial curve temperature, increased tensile strength at 160 deg F can be obtained without imparing the flexibility of the material. When the ratio of anhydride to epoxy is too small for a satisfactory cure, increased initial cure temperatures do not cause an increase in tensile strength at 160 deg F. A system to determine the thermomolecular correction for He/sup 3/ vapor pressure data is being assembled. This research is directed toward establishing an international temperature scale between 0.3 and 3.2DEK. The isotopes of B may be separated by thermal diffusion if BF/sub 3/ is used as the feed gas. Thermodynamic studies revealed that most conventional materials of construction are stable in BF/sub 3/ up to 1000 deg K. Methane is being evaluated as a feed gas to separate C/sup 13/ by thermal diffusion. A hot- wire thermal diffusion column separates the heavy impurities in CH/sub 4/ prior to enrichment of the C/sup 13/. Low temperature distillation is also being evaluated as a technlque to separate the impurities from CH/sub 4/. Studies on the conversion of CO to CH/sub 4/ with the activated Ni catalyst are being continued. Alternate methods to separate U isotopes are being evaluated. The reaction of UF/sub 6/ at elevated temperatures with various materials is being studied. Thermodynamic calculations indicate that Au is the only material which is stable in UF/sub 6/ at elevated temperatures. This material may be used in the design of a thermal diffusion column to separate research quantities of the U isotopes. The separation of U/sup 234/ from aged Pu/sup 238/ was demonstrated. Preliminary calculations indicate that Pu elution is not always quantitative. An agglomeration and degradation of the resin from alpha bombardment may contribute to poor eluation. Although the total capacity of the experimental resin was greatiy reduced, no accurate figures are available. New compounds of Po are being developed for use in lunar probe space vehicles. The polonides of all the rare earths (except Pm, Y, and Sm) were prepared. The melting points of these polonldes varied from 1370 deg C for Tb to 2400 deg C for Yb. The half-lives of three Ac/sup 227/ samples, determined in various calorimeters over an eight-year period, were calculated to be 21.771 years with a probable error of less than one day. These samples will be used as secondary heat standards in calorimetry. The viscosity of liquid Pr was remeasured at six different temperatures from 934 to 1009 deg C in an oxcillating cup viscosimeter to check the results of previous determinations. The results were in agreement with those previously obtained. Viscosity measurements were made at 936 to 1009 deg C. These data are still being evaluated. A method is being developed to measure the interfacial tensions of liquid metals. Although the maximum bubble pressure method is satisfactory for measurements involving aqueous-orgaric solutions, it is not satisfactory for liquid metals. Metallographic exarninatLon of Pu --Y alloys indicates a solid solubility betwen 20 and 22.5 at.% Pu in Y with no solid solubility of Y in Pu. The single phase, solid solution Y alloy has possibilities as a potential high temperature fuel material. Metallographic analysis of a Y crucible which contained molten U metal showed a solution attack of the Y by the U. The presence of an immiscible layer and droplets of a U--Y solution indicates that a miscibility gap is present in the system with the monotectic temperature below 1200 deg C. The resulte indicate that high purity Y is not an acceptable container for
- Research Organization:
- Mound Lab., Miamisburg, Ohio
- DOE Contract Number:
- AT(33-1)-GEN-53
- NSA Number:
- NSA-17-010239
- OSTI ID:
- 4739422
- Report Number(s):
- MLM-1140
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- United States
- Language:
- English
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