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碳纤维增强的纳米碳化硅陶瓷基复合材料力学性能优良,且具有一定的生物相容性,因此可作为一种新型的可取代钛合金的全尺寸整体人工骨骼。研究了具有三向正交结构的T300和M30碳纤维预制体对C/SiC复合材料制备过程和抗弯强度的影响规律。以聚碳硅烷为先驱体,以二乙烯基苯为溶剂和交连剂,采用聚合物浸渍热解法制备了C/SiC复合材料,采用阿基米德排水法测量其密度和气孔率,采用三点抗弯法测量其抗弯强度。M30 C/SiC抗弯强度比T300 C/SiC高6.7%,表明碳纤维弹性模量对复合材料基体开裂强度有显著影响,并通过增加纤维径向强度以及承担载荷的比例提高了复合材料的断裂强度。
Carbon fiber reinforced nano-SiC ceramic matrix composite has excellent mechanical properties and certain biocompatibility, so it can be used as a new full-scale integral artificial bone that can replace titanium alloy. The effects of T300 and M30 carbon fiber preform with three-way orthogonal structure on the preparation process and flexural strength of C / SiC composites were studied. Using polycarbosilane as precursor, divinylbenzene as solvent and crosslinking agent, the C / SiC composites were prepared by polymer impregnation pyrolysis, and the density and porosity were measured by Archimedes dewatering method. Three-point bending method to measure the flexural strength. The flexural strength of M30 C / SiC was 6.7% higher than that of T300 C / SiC, which indicated that the elastic modulus of carbon fiber had a significant effect on the cracking strength of the matrix and increased the fracture strength of the composite by increasing the radial strength of the fiber and the load bearing ratio .