| 摘要 |
Neutron absorbing refractory B4C-Gd and Gd2O3-Gd cermets, B4C-Gd and Gd2O3-Gd metal-matrix composites, and B4C-Gd2O3 ceramic-ceramic composites can be manufactured by applying fundamental thermodynamic and kinetic guidelines as processing principals. Three steps are involved in the fabrication of these new compositions of matter. First, the starting materials are consolidated into a compacted porous green body. Next, the green body is densified using the appropriate method depending on the class of material sought: cermet, metal-matrix composite, or ceramic-ceramic composite. Finally, either during the densification process or by subsequent heat treatment, new phase evolution is obtained via interfacial chemical reactions occurring in the microstructures. The existence of a new phase has been identified in B4C-Gd and B4C-Gd2O3 composites.
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