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D. Santos Leite. Avaliação da utilização de casca cerâmica produzida com lama cerâmica primária e secundária de pó de telha reciclado no processo de microfusão 2019. 63 p. Dissertações de Mestrado – Instituto de Pesquisas Energéticas e Nucleares – IPEN – CNEN/SP. São Paulo. The lost wax process has for many years been the main production process generating parts of high complexity to meet the most varied industrial segments such as automotive, power generation, medical and military. The main feature of this process is to obtain ceramic shells by means of ceramic slurry baths anchored by granular refractory material applied to the surface of wax models in the shape of the final part. This work evaluated the properties of tile powder and also the ceramic shells produced with slurries using the tile powder itself as a refractory material in both primary and secondary slurries. The powder of tiles presented high particle size dispersion # 20 # 325 mesh and in its composition important refractory compounds such as silica and alumina were identified. The tests carried out on the ceramic shells made with tile powder slurries showed green and calcined (1000 °C) modulus of 1.02 MPa and 4.95 MPa respectively and a heat permeability of (1000 °C) 4, 2 L / min. The tests in the ceramic shells used in the industry showed green and calcined rupture modulus results of 2.48 MPa and 5.7 MPa and permeability of 3.8 L/min respectively. The ceramic shells made with powder tiles had a lower rupture modulus than the industrial ceramic shell, but with a higher permeability result. The ceramic shells with tile slurries showed good performance during the casting of liquid aluminum 356, bronze and gray cast iron, no mold breaks and no reaction with the metal. The parts cast with the ceramic shells produced with tile powder slurries e met the dimensional tolerances required by ABNT NBR 15990.