Rapid Oxidation Characterization of Ultra‐High Temperature Ceramics

Here, a novel method for testing ultra‐high‐temperature ceramics (UHTC) at a high temperature, rapidly, at a low cost is introduced. A self‐supported, self‐heated ribbon specimen is used with a table‐top apparatus to achieve the necessary high temperatures. This method enables a large temperature–time–composition parameter space to be covered by rapidly producing a large set of postoxidation samples for analysis. The complex oxide scale known to form during oxidation of UHTC materials is shown to be easily reproduced using this method. A ZrB 2 –SiC (15 vol%) UHTC material was tested at 1700° C for 15 min. The oxide scale consists of a thin outermost silica (SiO 2 ) layer and a zirconia (ZrO 2 ) columnar layer with small amounts of SiO 2 embedded between the ZrO 2 columns. A region of SiC‐depleted zone was observed between the unreacted core and the ZrO 2 layer. The measured thickness of the oxide scale was 102 μm and ∼120 μm for the SiC‐depleted zone.