THERMAL BEHAVIOR OF COATED BIO-POLYMERS

Thermal behavior in plastic materials has a strong influence on their performance. In the current research, scientists are using different equipment that highlights the calorimetric behavior of parts by the identification and localization of transitions and exothermic/endothermic reactions that take place during material heating. The paper aims to characterize from a thermal point of view a lignin-based polymer (Arboblend V2 Nature) coated with three distinct micro-ceramic powders: two based on chrome oxide - Cr2O3, Cr2O3 -xSiO2 -yTiO2 (commercial name Amdry 6420 and Metco 136F) and one based on zirconium oxide - ZrO2 18TiO2 10Y2O3 (commercially known as Metco 143). The samples to be covered were obtained by injection in the mold and the coating technique used was a thermal – APS (Atmospheric Plasma Spray). After thermal analysis, all three coated samples reviled thermal stability up to 230°C, the degradation of the lignin matrix taking place around 345°C. Thus, based on this important data the recommendation to be used in practical applications can be made. So, the Arbobelnd V2 Nature bio-polymer coated with ceramic micro-particles works in normal working parameters for temperatures not exceeding 200°C. The paper also highlights in the beginning part the systemic analysis of the coating process in order to underline the factors that significantly influence the output parameters as: structure, morphology, mechanical, tribological, and thermal behavior.