聚硅氧烷先驱体转化制备2D C_f/Si-O-C材料

Study of 2D C_f/Si-O-C Fabricated via Polysiloxane Pyrolysis

以二维碳纤维布和廉价的聚硅氧烷为原料,采用先驱体转化工艺制备2D Cf/Si-O-C材料,对其力学性能进行了考察,并与以聚碳硅烷为先驱体制备的2D Cf/SiC材料在价格和性能方面进行了对比。实验表明,2D Cf/Si-O-C材料力学性能较2D Cf/SiC材料有所下降,但成本大大降低。2D Cf/Si-O-C材料弯曲强度达到157.9 MPa,断裂韧性达到8.4MPa.m1/2,剪切强度达到23.4MPa,并且在1400℃下能较好保持材料的力学性能。

Carbon fiber cloth reinforced silicon oxycarbide （2D Cf/Si-O-C） composites were fabricated with cheap polysiloxane （PSO） and divinylbenzene （DVB） as precursors and carbon fiber cloth as reinforcements. The mechanical properties of 2D Cf/Si-O-C composites with polysiloxane as precursors were investigated and the difference of properties and cost between them and 2D Cf/SiC composites were also studied in the paper. The results show that the mechanical properties of 2D Cf/Si-O-C are decreased and the cost of them reduced greatly. The flexural strength, fracture toughness and shear strength reach 157.9MPa, 8.4MPa·m^1/2 and 23.4MPa respectively. Such mechanical properties can be reserved up to 1400℃.