碳纤维表面CVD硅涂层对其性能的影响

 分析了碳纤维表面化学气相沉积Ｓｉ涂层的相结构,研究了Ｓｉ涂层对碳纤维抗氧化性能及强度的影响。结果表明：涂层中Ｓｉ元素呈非晶态分布；Ｓｉ涂层可提高碳纤维的抗氧化性能；氧化温度不同,Ｓｉ涂层碳纤维的氧化失重或增重规律也不相同。同时,Ｓｉ涂层降低了碳纤维拉伸强度,而适度空气氧化又可使Ｓｉ涂层碳纤维强度得到大幅度提高；Ｓｉ涂层碳纤维的强度随氧化温度、氧化时间的变化而改变。

INFLUENCE OF CVD Si COATING ON THE SURFACE OF CARBON FIBERS ON THEIR PROPERTIES

There are adopted CVD method and acquired unifonn Si coating on the surfaee of carbon fibers(CF),analyzed further phase structure of Si coating,researched that influenee of Si coating on the oxidation resistance and tensile strength properties of CF. Experimental results show that the phase structure of Si in the coating is noncrystaline; Si coating can rise the oxidation resistance of CF; which the oxidation temperatures are at 400℃ and 500℃,Si coat- ing CF oxidated have the increase of weight stage; but which oxidation temperature is up to 600℃,Si coating CF have only weight loss stage, meanwhile Si coating have the tensile strength of CF depressed,but the comfort air oxidation may have the tensile strength of CF improved further,while the oxidation times are stretched,the tensile strength of coating CF is increasing progressively at 400℃ and it is increasing as a starter and then dropping at 500℃;but which the oxidation temperature is up to 600℃,the tensile strength of coating CF is in- creasing quickly as a starter and then droppinng rapidly.