Retained strength of UHTCMCs after oxidation at 2278 K

In the frame of Horizon 2020 European C3HARME research project, the manufacture of ZrB2-based CMCs was developed through different processes: slurry infiltration and sintering, radio frequency chemical vapour infiltration (RF-CVI) and reactive metal infiltration (RMI). To assess the high temperature stability, room temperature bending strength was measured after oxidizing the samples at 2278 K and compared to the strength of the asproduced materials. Microstructures were analysed before and after the thermal treatment to assess the damage induced by the high temperature oxidation. Short fibre-reinforced composites showed the highest retained strength (>80%) and an unchanged stress-strain curve.

Automated summary

In the frame of the Horizon 2020 European C3HARME research project, different processes were developed for the manufacture of ZrB2-based CMCs. The high temperature stability and microstructures of the materials were assessed to evaluate the influence of oxidation on the properties, with short fibre-reinforced composites showing the best performance.