Desenvolvimento de um processo de fundição por cera perdida utilizando cimento refratário

Abstract

Investment casting also known as lost wax casting is a technique used for the production of metal parts, making it possible to use almost all alloys. It presents itself as an advantageous method due to the possibility of producing parts with more complex shapes, obtaining greater dimensional accuracy, in addition to the possibility of a practically finished product, which requires little or no further machining. The lost wax casting technique was used to produce metallic pendants. The technique consisted of making a wax model, cast in a mold developed by a 3D printer. Subsequently, the wax model was coated with two layers of refractory material (a mixture of cement based on alumina, sand, sodium silicate and water) and a last layer of sand, sodium silicate and water. In the next stage, the piece was placed in the oven and heated until the wax melted and flowed through gravity. The ceramic shell obtained was calcined at 750 ° C for 30 minutes and, afterwards, the liquid metal was poured.