MATERIAU COMBUSTIBLE NUCLEAIRE COMPOSITE ET PROCEDE DE FABRICATION DU MATERIAU

摘要

Nuclear combustible composite material containing a ceramic matrix inert under irradiation in which particles of a nuclear combustible of size 1-10 mu are dispersed between the matrix and the particles, is claimed. The thermal expansion coefficient of the matrix is less than that of the particles of the combustible. The fabrication of the combustible material is also claimed. It involves: (a) mixing of particles of a precursor of a nuclear combustible with well define granulometry with a material to form the ceramic matrix inert under irradiation (b) extruding of the mixture by compression (c) fritting of the extruded mixture under a reducing atmosphere containing water and under conditions such that the nuclear combustible has a reduced unit cell volume under thermal treatment.