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采用氧-乙炔火焰法在YT14硬质合金表面沉积碳纳米材料,借助扫描电子显微镜和激光拉曼光谱仪对火焰沉积碳产物的形貌和结构进行了表征,并分析研究了火焰结构对沉积产物的影响。结果表明,氧-乙炔火焰的内焰长度、基体在火焰中所处位置和火焰沉积温度不同,火焰中的碳氢基团和活性质点等气相成分种类、浓度及分布梯度相应发生了变化,所获得的火焰沉积产物和分布状况也不一样。当内焰长度调至50 mm、基体-喷嘴距离为30 mm、沉积温度为850℃时,沉积产物主要为“菜花状”的类金刚石碳;当内焰长度调至70 mm、基体-喷嘴距离为40 mm、沉积温度为750℃时,沉积产物主要为“颗粒状”的纳米针状碳聚集体。
The carbon nanomaterials were deposited on the surface of YT14 carbide by oxy-acetylene flame method. The morphology and structure of the flame-deposited carbon products were characterized by scanning electron microscopy and laser Raman spectroscopy. The effects of flame structure on the deposition products influences. The results show that the inner flame length, the location of the matrix in the flame and the flame deposition temperature are different. The types, concentrations and distribution gradients of the gaseous constituents such as hydrocarbon groups and active particles in the flame are changed accordingly The resulting flame deposits are also distributed differently. When the inner flame length was adjusted to 50 mm, the substrate-nozzle distance was 30 mm, and the deposition temperature was 850 ° C, the deposition products were mainly “cauliflower-like” diamond-like carbon. When the inner flame length was adjusted to 70 mm, When the nozzle distance is 40 mm and the deposition temperature is 750 ℃, the deposited products are mainly “granular” nanometer acicular carbon aggregates.