Projeto e fabricação de cadinho para equipamento de análise térmica

Abstract

Thermal analyzes are extremely important in determining and monitoring certain physical and/or chemical material properties. The thermogravimetric analysis technique results in a thermal decomposition curve, mass variation as a function of time and temperature. However, the current sample holder, known as a crucible, is made of nickel and its structure has been damaged due to corrosion caused by the reaction with some sample, or a sequence of these, many of them industrial waste. A proposed solution to solve this problem was to change the material to tin oxide (SnO2). This work manufactured a crucible in SnO2 for use in thermogravimetric analysis equipment. The project development methodology followed several steps, including obtaining the ceramic suspension, manufacturing the prototype, making the plaster mold, and obtaining the crucibles by gluing slip. In addition to the validation tests for the proposed project, others analysis were made including pycnometry, porosimetry, density, bending tests, and especially thermogravimetry. The result obtained for the proposed project was satisfactory, considering that the values found compared to previous work were very close. The main test, thermogravimetric, attested to the functionality of the tin oxide crucible, since there was no chemical reaction with the test sample, nor malfunctions or damage to the crucible. In this way, it will be possible to manufacture internally, eliminating the dependence on acquisition through a single supplier.