氧化镍掺杂酚醛树脂热解炭的结构及抗氧化性

Structure and Oxidation Resistance of Pyrolytic Carbon from Phenol Resin-doped Ni203 Powder

在普通酚醛树脂中直接掺杂氧化镍粉末,研究氧化镍掺量和炭化处理温度对树脂热解炭的结构与氧化过程的影响,用X射线衍射仪、拉曼光谱分析仪、扫描电镜和综合差热分析仪等对掺杂改性树脂热解炭的石墨化度、显微结构及氧化过程分析表征,结果表明,在埋炭条件下掺杂改性树脂在450-750℃的炭化处理中三氧化二镍被逐级还原为一氧化镍和单质镍后,碳原子在镍颗粒上沉积生长,形成晶须、片状或块状结构的热解炭,热解炭石墨化程度取决于炭化温度和氧化镍掺杂量,在高于1050℃炭化处理的热解炭中出现明显的石墨化炭峰,随着掺杂量增加,热解炭石墨化程度大大增加,氧化温度比普通树脂明显提高,且以3~5%的掺杂量为佳。

Ni2O3 was directly doped into phenol resin as a catalyzer with aim of conversion of amorphous carbon into graphite structure in pyrolytic process. The effect of the amount of Ni2O3 powders and coking temperature on pyrolytic reaction of phenol resin, structure and oxidation of pyrolytic carbon was investigated by means of XRD, SEM, Raman spectrum and DSC-TG. The results showed that Ni2O3 will be reduced gradually into NiO and metal Ni at the temperature from 450℃ to 750℃ under the condition of buried carbon, then decomposed carbon atom was deposited on the Ni particles and formed whisker, whisker, flake and block structures. The graphitization of pyrolytic carbon depends on carbonization temperatures and doping amount of Ni2O3 powder. At higher than 1050℃ the graphite carbon appears remarkably in the pyrolytic product and its content increases with the doping amount in phenol resin. The pyrolytic carbon of doped resin has better oxidation resistance than that of resin without NizO3 dopant. The optimum amount is 3- 5% Ni2O3 into phenol resin for good oxidation resistance of pyrolytic carbon.