Abstract: Using fine powders of lithium aluminate synthesized by the solid-state reaction as the starting materials,
porous thin-wall tubelike specimens were fabricated by the improved hot pressure casting method. This process was studied from the following aspects
such as the mechanism of tritium release, calcine temperature, particle size, modifying agent and the process of sintering. Compared with conventional
sintering, much finer grain, increased compressive strength and more homogeneous microstructure could be achieved in microwave processing, due to
decreased sintering temperature and an enhanced densification rate, and such values were very suitable for the tritium breeding materials.

Key words: hot pressure casting, lithium aluminate, microwave sintering