Ceramic and cermet targets

• Main Authors: Kobisk, E. H., Quinby, T. C., Aaron, W. S.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Oak Ridge National Laboratory 1979
• Subjects: Wires; 46 Instrumentation Related To Nuclear Science And Technology; Magnesium Oxides; Plutonium Compounds; Organic Compounds; Transition Elements; Urea; Nitric Acid; Oxides; Amides; Encapsulation; Pressing; Fabrication; Ceramics; Metallurgy; Isotopes; Chalcogenides; Plutonium Isotopes; Vanadium; Extrusion; Even-Odd Nuclei; Plutonium Dioxide; Oxygen Compounds; Materials; 440102 > Radiation Instrumentation > Radiation Dosemeters; Neutron Dosimetry; Powder Metallurgy; Sintering; Alpha Decay Radioisotopes; Magnesium Compounds; Materials Working; Alkaline Earth Metal Compounds; Inorganic Acids; Neutron Flux; Plutonium Oxides; Actinide Isotopes; Transuranium Compounds; Elements; Metals; Hot Pressing; Cermets; Nuclei; Carbonic Acid Derivatives; Actinide Compounds; Years Living Radioisotopes 360201* > Ceramics; & Refractories > Preparation & Fabrication; 36 Materials Science; Dosimetry; Organic Nitrogen Compounds; Radioisotopes; Hydrogen Compounds; Composite Materials; Radiation Flux; Plutonium 239; Actinide Nuclei; Heavy Nuclei; Carbonic acid
• Online Access: https://digital.library.unt.edu/ark:/67531/metadc1069814/

Use of isotopic materials as targets in high temperature environments, e.g., reactor cores, require that chemically stable forms of the isotopes be employed. Usually oxides are compatible with temperatures > 1600/sup 0/K, although some light element oxides exhibit some volatility at temperatures > 1300/sup 0/K. Especially in the case of heavy elements, the relatively low melting points of the metals, poor compatibility of the metals with encapsulation materials, and high chemical reactivity at moderate temperatures preclude the use of metal targets. However, encapsulation of ceramic targets has been successfully performed yielding high integrity samples. If hydrogen-reducible metals are mixed with the isotope(s), malleable, high strength, corrosion resistant targets can be rolled which contain a ceramic phase of isotope oxide. Isotope dilutions, additions of metals to form the metal matrix of a cermet target, and subsequent homogenization of all components are performed by dissolution in molten urea followed by calcination and compaction into the desired target form.