Estudo das propriedades físicas e mecânicas de peças sinterizadas de granito corumbá produzidas por metalurgia do pó

Abstract

The ornamental stone industry has been growing exponentially in recent decades. Hence, resulting in the production of large amount of waste. Waste from the processing of rocks has been generated, awakening the need to minimize the environmental impacts generated and proportions applicable to these tailings. This work aims to analyse the potential of the Corumbá granite tailings as a raw material for the manufacture of sintered parts by powder metallurgy. Granite powder characterization analyses were performed using X-ray diffraction and fluorescence. In order to determine the optimal sintering temperature, specimens were sintered in four different specifications: A - 1130 °C, B - 1140 °C, C - 1150 °C and D - 1200 °C. It was concluded that at a temperature of 1140 °C the specimens is better vitrified and deforms less, therefore, that temperature was adopted for carrying out the subsequent tests. Specimens were evaluated regarding as physical properties of volumetric variation and porosity and as mechanical properties of the sintered parts using Rockwell B hardness and diametrical compression. The results obtained allow us to conclude that there was no statistically significant variation in the mechanical properties of hardness and diametrical compression with variation in the compaction pressure, which were exclusively linked to the sintering temperature.