Ablation Morphology and Microstructure of 3D Orthogonal Cf/SiC Composites Prepared by PIP

Abstract

SiC ceramic matrix composites reinforced by 3D orthogonal carbon fibers (C/SiC) were prepared by polycarbosilane infiltration pyrolysis (PIP). The 3D C/SiC composite was ablated by oxy-acetylene flame. The oxygen volume flow and acetylene volume flow were 0.42 L/s and 0.31 L/s, respectively. The ablation period was 180s. The ablation morphology and microstructure of the surface of 3D C/SiC composite were investigated. The ablation mechanism of the 3D C/SiC composites under the oxyacetylene condition is a combination effect of thermo-oxidation ablation, thermo-physics ablation and mechanical erosion.

Morphology and Microstructure of Three‐Dimensional Orthogonal C/SiC Composites Ablated by an Oxyacetylene Flame at 2900°C

“…The ablation rates of the center region and the outer region were 2.5 and 1.1 μm/s, respectively. The ablation rate of the center region at 2900°C was larger than at 2300°C, 16 which could have resulted from the oxidization of the carbon fibers and decomposition or sublimation of the SiC matrix. The center ablation region presents a gray coating, which had covered the fibers completely.…”

“…So far, ablation research was focused on the optimization of the testing environment, C/C composites, and 2D C/SiC composites, 12–15 much less of 3D orthogonal (3DO) C/SiC composites. The morphology and microstructure of 3DO C/SiC composites ablated by an oxyacetylene flame at 2300°C were reported 16 . The aim of the present study is to investigate the morphology and microstructure of 3DO C/SiC composites ablated by an oxyacetylene flame at 2900°C.…”

Oxy-Butane Ablation Testing of Thermal Protection Systems Based on Nanomodified Phenolic Resin Matrix Materials

“…Ablative-type materials based on phenolic resin in neat form and with nanometric silicon carbide nanofiller, reinforced by carbon fibre felt (ablative PR-felt) and cork, respectively (ablative PR-cork) (Figure 1). different ablation regions on the tested surface indicated that the centre region showed sublimation and mechanical erosion, while towards the outer regions, the mechanism was a combination of oxidation and mechanical erosion [26]. Several factors influence the ablative TPS behaviour, from its composition and manufacturing process to the oxygen/ethanol ratio in the used torch.…”

“…The ablation mechanism of 3D orthogonal Cf/SiC composites under oxyacetylene conditions was identified as a combination effect of thermo-oxidation ablation, thermo-physics ablation, and mechanical erosion. Scanning electron microscopy of different ablation regions on the tested surface indicated that the centre region showed sublimation and mechanical erosion, while towards the outer regions, the mechanism was a combination of oxidation and mechanical erosion [26]. Several factors influence the ablative TPS behaviour, from its composition and manufacturing process to the oxygen/ethanol ratio in the used torch.…”