發(fā)布時間：2018-05-17 12:24

  本文選題：Fe基 + 非晶涂層�。� 參考：《中國表面工程》2017年01期

【摘要】：采用火焰噴涂自制的FeCrBSiNb氣霧化合金粉末,制備了高非晶含量的Fe基非晶涂層。利用X射線衍射儀、掃描電鏡和透射電鏡分析了粉末和涂層的相組織結構、表面形貌和微觀特征。結果表明:FeCrBSiNb合金粉末主要有FeCrSi固溶體和B化物組成,粉末球形度較好,大顆粒粉末表面粗糙,主要為枝晶狀組織,并伴有"衛(wèi)星"球。制備的FeCrBSiNb非晶涂層潤濕性較好,粒子搭接邊界不明顯,非晶體積分數(shù)高達80%。非晶涂層存在少量孔隙,主要是未熔顆粒的嵌入、熔融粒子凝固時的"驟冷"應力和氣體逸出造成。FeCrBSiNb非晶涂層在532~644℃存在明顯放熱峰,玻璃轉(zhuǎn)變溫度Tg為509℃,開始晶化溫度Tx為532℃,其形成非晶相的臨界冷卻速率為3.458×103 K/s,在同一試驗條件下,非晶涂層的相對耐磨性是45鋼基體的2.6倍。
[Abstract]:Fe based amorphous coating with high amorphous content was prepared by flame spraying FeCrBSiNb gas atomized alloy powder. The phase structure, surface morphology and microstructure of the powder and coating were analyzed by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results show that the powder consists of FeCrSi solid solution and B compound. The powder has a good sphericity. The surface of the large particle powder is rough, and it is mainly dendritic structure, accompanied by "satellite" ball. The FeCrBSiNb amorphous coating has good wettability, the boundary of particle lap is not obvious, and the integral number of amorphous is up to 80. There are a few pores in the amorphous coating, mainly the intercalation of the unmelted particles. The "quench" stress and gas escape during solidification of the molten particles cause the exothermic peak of the amorphous coating at 532 鈩，

本文編號：1901362