process for the production of targeted porositaten with largely gleichmassiger distribution in oxide kernbrennstoffteilchen

摘要

1,208,433. Nuclear fuel. UNITED KING- DOM ATOMIC ENERGY AUTHORITY. 27 March, 1968 [20 April, 1967], No. 18309/67. Heading G6C. [Also in Division C1] A porous artefact of uranium oxide or carbide which may also contain plutonium oxide or carbide is prepared by sintering the oxide or carbide of the higher valency state of the metal to form a densified artefact which is chemically unchanged and then heating the densified artefact in a reducing atmosphere to produce an oxide or carbide of the metal in the lower valency state. The sintering is preferably carried out at 800-1000‹C, for 1-4 hrs. in an oxidizing atmosphere. The reduction is preferably carried out at 1600‹ C. for 1-4 hrs. in a CO atmosphere. Spheres of U 3 O 8 having a porosity of 43-65% and being produced by gyrating particles of U 3 O 8 with n-decanol are preferably used in the process.