Wear resistance of polypropylene-SiC composite

6th International Conference on Fracture Fatigue and Wear

Abenojar, J.^1 ; Enciso, B.^1 ; Martínez, M.A.^1 ; Velasco, F.^1

Department of Materials Science and Engineering, Universidad Carlos III de Madrid, Av. Universidad 30, Leganés

28911, Spain^1

关键词: Chemical decomposition;    Digital microscopes;    Insulation performance;    Reaction temperature;    Silicon carbides (SiC);    Sliding distances;    Thermoplastic composite;    Wear characterization;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/843/1/012066/pdf
DOI  :  10.1088/1742-6596/843/1/012066

来源: IOP

【 摘 要 】

In this work, the wear resistance of thermoplastic composites with a high amount of ceramic is evaluated. Composites made of polypropylene (PP) and silicon carbide (SiC) powder at 50 wt% were used with the final objective of manufacturing ablative materials. This is the first part of a project studying the wear resistance and the mechanical properties of those composites, to be used in applications like habitat industry. In theory, the exposure to high temperature of ablative materials involves the elimination of thermal energy by the sacrifice of surface polymer. In our case, PP will act as a heat sink, up to the reaction temperature (melting or sublimation), where endothermic chemical decomposition into charred material and gaseous products occurs. As the surface is eroded, it is formed a SiC like-foam with improved insulation performance. Composites were produced by extrusion and hot compression. The wear characterization was performed by pin-on-disk test. Wear test was carried out under standard ASTM G99. The parameters were 120 rpm speed, 15 N load, a alumina ball with 6 mm as pin and 1000 m sliding distance. The tracks were also observed by opto-digital microscope.