The material in powder state has long been used by selective laser sintering (SLS) for
making rapid prototyping (RP) parts. A new approach to fabricate smoother surface roughness RP
parts of ceramic material from slurry-sate has been developed in this study. The silica slurry was
successfully laser-gelling in a self-developed laser sintering equipment. In order to overcome the
insufficient bonding strength between layers, a strategy is proposed to generate ceramic parts from a
single line, a single layer, to multi-layers of gelled cramic in this paper. It is found that when the
overlap of each single line is 25% and the over-gel between layers is 30%, stronger and more
accurate dimensional parts can be obtained under a laser power of 15W, a laser scanning speed of
250 mm/s, and a layer thickness of 0.1 mm. The 55:45 wt. % of the proportion between the silica
powder and silica solution results in suitable viscosity of the ceramic slurries without precipitation.
Furthermore, the effects of process parameters for the dimensional accuracy and surface roughness
of the gelled parts are investigated and appropriate parameters are obtained.