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SHS-離心法制備W-C-Fe金屬陶瓷內襯復合鋼管

Preparation of W-C-Fe cermet lined steel pipes by SHS-centrifugal process

  • 摘要: 以Fe2O3、WO3、Al和C為反應原料,采用SHS-離心法制備W-C-Fe內襯復合鋼管.利用X射線衍射分析內襯層的相組成,掃描電鏡觀察金屬陶瓷涂層的組織,利用能譜儀分析涂層與基體結合處的元素分布,顯微硬度儀測量內襯層硬度.結果表明:涂層與基體之間形成良好的冶金結合,涂層主要由Fe3W3C組成,還有少量的WC、W2C、Fe3C和Fe;涂層組織呈梯度分布,靠近基體處晶粒細小,遠離基體處晶粒呈粗大樹枝狀;涂層顯微硬度為13.5±1.6GPa,是基體的7~8倍.

     

    Abstract: A cermet lined steel pipe was prepared by the self-propagating high-temperature synthesis (SHS) centrifugal process. In the process, Fe203, WO3, Al and C were used as the staring mixture in order to synthesize a cermet lined coating after the mixture ignited and combusted. The phases in the synthesized coating were examined by X-ray diffraction (XRD). The of the coating and the substrate/coating bonding interface and the distribution of elements adjacent to the interface were analyzed by scanning electron microscopy (SEM) and energy dispersion spectroscope (EDS). The hardness of the coating was measured. The resuits show that a metallurgical bonding interface is formed between the coating and the substrate pipe. The coating is mainly composed of Fe3W3C, and there is a little WC, W2C, Fe3C and Fe in the coating. The phases in the coating possess a gradient distribution along the depth of the coating. The grains near the substrate are fine but those far from the substrate are coarse dendrite crystals. The microhardness of the coating is 13,50±1.6 GPa, which is 7-8 times higher than that of the substrate.

     

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