原位反应渗透法制备石墨/AlN涂层材料

Fabrication of AIN Coating/Graphite Composites by In Situ Infiltrating Reaction

采用喷射法在石墨基体表面形成BN薄层,利用AI与BN原位渗透反应并渗入石墨基体,在基体获得AIN涂层来增强石墨的抗腐蚀能力。采用DTA、XRD分析方法,对原位反应过程进行分析,并探索了热处理工艺条件对反应物相结构的影响,确定了的最佳热处理工艺条件。采用SEM分析方法,对喷射工艺参数以及AIN涂层/石墨微观结构进行分析;采用EPMA对合成AIN涂层/石墨进行元素分布分析。结果表明:采用原位合成工艺可获得致密结构的AIN涂层,同时在石墨基体与涂层之间形成致密的结合界面。

BN thin films were formed on the surface of graphite, and AlN coating was prepared by the chemical reaction of aluminum, BN and graphite system. DTA and XRD were adopted to analyze the in situ reaction processing. The effect of heat treatment on the reactant phase structure were investigated and then the optimum parameters were decided. The spray parameters and the microstructures of AlN coating graphite were analyzed by SEM and its element distributions were tested by EPMA. The results show that AlN coating has a dense structure and mean while an interface between the AlN coating and the graphite has been formed.