Microstructure of TiC/Fe composite coatings prepared by reactive flame spraying
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摘要: 采用鈦鐵礦粉、石墨粉和鐵粉為主要原料,利用反應火焰噴涂技術成功制備了TiC/Fe金屬陶瓷復合涂層.采用X射線衍射儀、掃描電鏡、透射電鏡等手段,研究了涂層的顯微組織結構.結果表明,反應火焰噴涂TiC/Fe復合涂層主要由TiC和Fe兩相組成.涂層具有多層多相的結構,即由TiC含量不同的片層交替疊加而成;在富TiC片層中,大量的、比較細小的(粒度小于0.5μm)、大致呈球形的TiC顆粒彌散分布在Fe基體上.這種顯微組織結構有利于改善金屬陶瓷涂層的耐磨性能.
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關鍵詞:
- 金屬陶瓷 /
- 涂層 /
- TiC/Fe /
- 顯微結構 /
- 自蔓延高溫合成(SHS)
Abstract: TiC/Fe composite coatings were successfully obtained by reactive flame spraying (RFS) with ilmenite, graphite and ferrous powder as rough materials. The microstructure of the composite coatings and the relations among their wear properties, phases and microstructure were investigated by X-ray diffraction, scanning electron microscopy and transaction electron microscopy. The results show that the composite coatings mainly consist of TiC and Fe phases and were composed of alternate soft and hard layers with different TiC contents. In the TiC-rich layers, lots of submicron (< 0.5 μm) and approximately round TiC particles are dis-persed in the iron matrix. This multiphase and multilayer coatings will be helpful to improve the wear resistance of cermet composite coatings.-
Key words:
- cermets /
- coating /
- TiC/Fe /
- microstructure /
- self-propagating high-temperature synthesis(SHS)
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