16 research outputs found
Avaliação de revestimentos para proteção contra a descarbonetação de tijolos refratårios MgO-C durante o aquecimento de panelas de aciaria
Uso de tĂ©cnicas estatĂsticas para modelar a resistĂȘncia Ă flexĂŁo de corpos cerĂąmicos contendo resĂduo de granito
Estudo da viabilidade do uso de resĂduo de polimento de rochas ornamentais em porcelanas
Avaliação da atividade cicatrizante do jucå (Caesalpinia ferrea Mart. ex Tul. var. ferrea) em lesÔes cutùneas de caprinos
Prediction of glass phase viscosity in firing traditional ceramics and porcelain tiles with waste glass powder
The theoretical calculation of the viscosity of traditional ceramic materials is complex and models based on glass processing are generally used to estimate the viscosity of the glass phase according to its chemical composition. FactSage model considers structural information from silicate melts (glass phase), which is a different approach compared to other models. The viscosity of the melt fraction was calculated for different traditional ceramics, such as hard porcelain, technical porcelain, sanitary ware and porcelain tiles, including formulations with partial replacement of the fluxing raw material by soda-lime glass waste. FactSage model consistently indicated an increase in viscosity with higher levels of silica and a decrease in viscosity with the utilization of soda-lime glass waste in the formulations. Different responses and a nonlinear behavior were presented when varying the Na2O/K2O contents in the glass phase. The tested models presented reliable results for the processing of molten glass, but depending on the chemical composition and temperature, significant differences were observed among the values. Despite this, models that simulate the viscosity of the glass phase can help to optimize production conditions, but more investigations are needed to improve the relationship between theoretical and experimental results of viscosity