碳布铺层方式对C/ C-SiC 薄壁喉衬性能的影响

通过CVI+PIP 制备了准三维针刺C/ C-SiC 薄壁喉衬,预制体碳布铺层方式分别采用与喉衬内型 面形状相同的仿形铺层以及与喉衬入口端角度相同30°铺层。研究了两种铺层方式对最终构件层间弯曲性 能、整体承压性能以及抗烧蚀抗冲刷的影响。结果表明,构件的弯曲强度分别为205 和152 MPa;水压爆破压 力分别为6. 5 和4. 9 MPa。用与材料表面夹角为30°的氧乙炔气流考查材料的抗烧蚀及冲刷性能,同角度铺层 成型材料抗冲刷能力明显较好,200 s 其线烧蚀率为仿形铺层成型材料的70%。

Effect of Carbon Cloth Spreading Means on Performance of

Quasi-three dimensional needled C/ C-silicon carbide thin-wall throats were prepared by CVI+PIP combined process. The performs were spreading individually by carbon cloth layers which is copying the inner moulding surface of the throat and 30° carbon cloth layers which is the same as the entrance angle of the throat. The effect of the two carbon cloth spreading means on the bending performance, integral bearing performance and anti-ablative and erosion properties of C/ C-SiC components are investigated. Results show that the bending intensity of the components is 205 MPa and 152 MPa and the hydraulic bursting pressure is 6. 5 MPa and 4. 9 MPa separately. The ablation properties are investigated using oxyacetylene ablation technique with the angle between the gas flow and material surface is 30°. The anti-ablative and anti-erosion properties of 30° carbon cloth spreading composites is excellent. The linear ablation rate is 70% compared to that of carbon cloth copying spreading composites after 200 s ablation time.