Unidirectional SiC_f/SiC-matrix composites with a pyrocarbon interface were prepared by hot-pressing SiC nano-powder via a liquid phase of sintering additives under high temperature (1900 °C) and applied pressure (20 MPa). The SiC reinforcing fiber volume fraction of the composites varied from 0 to 78 vol% and was found to have significant effects on densification and mechanical properties, where changes in failure mode, proportional limit stress, ultimate strength, and elastic modulus were observed. The mechanical properties were significantly enhanced with an increase in the fiber volume fraction until a moderately high fiber content was obtained, after which the ultimate strength of the composite degraded. These observations were related to the open porosity within the fiber bundles. Further, fiber strength was affected by fiber damage caused by contact with the surrounding matrix due to poor densification of the SiC nano-powder.

单向碳化硅_˚F通过在高温（1900°C）和施加压力（20 MPa）下通过烧结添加剂液相热压SiC纳米粉，制备具有热碳界面的/ SiC基复合材料。复合材料的SiC增强纤维体积分数从0到78 vol％不等，并且发现它们对致密化和机械性能有显着影响，其中观察到破坏模式，比例极限应力，极限强度和弹性模量的变化。随着纤维体积分数的增加，机械性能显着增强，直到获得适度的高纤维含量，此后复合材料的极限强度降低。这些观察结果与纤维束内的开孔率有关。进一步，