Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1656324 | Surface and Coatings Technology | 2016 | 9 Pages |
Abstract
To improve the ablation resistance of carbon/carbon (C/C) composites at high temperature, a ZrB2-SiC-ZrC coating was prepared on the surface of SiC-coated C/C composites by supersonic atmosphere plasma spray (SAPS). Ablation resistance of the coated C/C composites was tested in an oxyacetylene torch environment with a heat flux of 2400Â kW/m2 for 120, 150 and 200Â s, respectively. After ablation for 120Â s, the coating exhibited a three-layered structure consisting of a porous ZrO2 layer, a ZrO2-SiO2 thin layer and a SiC-depleted layer, whereas it transformed into a two-layered structure (ZrO2 recrystallized layer and ZrO2-SiO2 layer) after ablation for 150Â s. With the increase of ablation time, the SiC inner coating was almost consumed and a gap emerged between the ZrO2 layer and the C/C matrix after ablation for 200Â s. The good ablation resistance of the sprayed coating is mainly attributed to the layered structure acting as a thermal barrier and inhibiting inward diffusion of oxygen.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Yulei Zhang, Heng Hu, Pengfei Zhang, Zhixiong Hu, Hejun Li, Leilei Zhang,