مقاومت به فرسایش و اکسیداسیون پوشش SiC برای کامپوزیت های کربن- کربن

Oxidation and ablation resistance of ZrB2–SiC–Si/B-modified

SiC coating for carbon/carbon composites

مقاومت به فرسایش و اکسیداسیون پوشش SiC اصلاح شده با ZrB2-SiC-Si/B

برای کامپوزیت های کربن/ کربن

ABSTRACT

ZrB2–SiC–Si/B-modified SiC coating was prepared on the surface of carbon/carbon (C/C) composites by two-step pack cementation. The coating could efficiently provide protection for C/C composites from oxidation and ablation. The improvement of oxidation resistance was attributed to the self-sealing property of the multilayer coating. A dense glassy oxide layer could afford the high temperature up to 2573 K and efficiently protect C/C composites from ablation.

اثر توزیع ZrB2 و SiC روی فرسایش کامپوزیت های کربن/کربن اصلاح شده

Effect of ZrB2 and SiC distributions on the ablation of

modified carbon/carbon composites

اثر توزیع ZrB2 و SiC روی فرسایش کامپوزیت های کربن/کربن اصلاح شده

ABSTRACT

To understand the effect of introduced phases’ distribution on the ablation of carbon/carbon (C/C) composites, C/C–ZrB2–SiC composites containing isolated (SZ-1) and coupled (SZ-2) ZrB2–SiC particles were prepared via controllable precursor infiltrations and pyrolysis, respectively. Ablation under oxyacetylene torch at both Z and XY directions showed that SZ-1 had better ablation resistance than SZ-2, while the surface temperature rose up to about 2400 °C. The ablated surface morphologies showed that a relative integrate layer of ablation products was formed on SZ-1, whereas the layer on SZ-2 was defective. It was believed that the dissimilar distributions of ZrB2–SiC particles in composites resulted in distinct structures of ablation products on the surfaces and consequently their different ablation behavior.