C/C复合材料高温纯化与致密化技术研究

Research on high temperature purification and densification technology of C/C composite

为实现光伏设备中炭素热场材料的循环使用,对硅化腐蚀后的C/C复合材料采用先纯化、再沉积的工艺路线,研究了不同工艺对C/C复合材料体积密度、抗折强度、物相组成以及微观元素分布的变化情况。结果表明:采用高温还原纯化法可大幅降低C/C复合材料中存在的Si元素,且纯化次数越多,纯化效果越明显。与此同时,在经过气相沉积后,材料密度和抗折强度均得到改善,分别从最初的1.94 g/cm^(3)和11.23 MPa提升至2.09 g/cm^(3)和22.93 MPa。

In order to realize the recycling use of carbon thermal field materials in photovoltaic equipment,the C/C composite material after silicidation and corrosion is purified first and then deposited.The effects of different processes on the bulk density,flexural strength,phase composition and microscopic element distribution of the C/C composite material are researched.The results show that the high temperature reduction purification method can greatly reduce the Si content in the C/C composite,and the more purification times,the more obvious purification effect.At the same time,after vapor deposition,both the bulk density and flexural strength are improved,from the initial 1.94 g/cm^(3) and 11.23 MPa to 2.09 g/cm^(3) and 22.93 MPa,respectively.