(裝甲兵工程學(xué)院 裝備再制造技術(shù)國(guó)防科技重點(diǎn)實(shí)驗(yàn)室， 北京 100072)
摘 要: 采用粉芯絲材和高速電弧噴涂技術(shù)（HVAS）制備了Fe-Al金屬間化合物涂層， 并研究了涂層的顯微組織和室溫至650℃的滑動(dòng)摩擦磨損性能。 結(jié)果表明： Fe-Al涂層的平均成分為Fe-20.0Al-14.1O（摩爾分?jǐn)?shù)， %）， 主要相是Fe3Al， FeAl， α-Fe， Al2O3及少量Al； 涂層具有較高的結(jié)合強(qiáng)度和硬度、較低的孔隙率及較高的高溫耐磨性； 高溫下磨損面形成了大面積的氧化物保護(hù)層， 降低了涂層的摩擦因數(shù)， 而剝層磨損是涂層的主要磨損機(jī)制。 涂層中Fe3Al和FeAl金屬間化合物相較高的高溫強(qiáng)度和硬度能有效地阻礙裂紋的產(chǎn)生、擴(kuò)展及扁平顆粒的斷裂， 從而使Fe-Al涂層表現(xiàn)出優(yōu)異的高溫耐磨性。
附件:(2004)S1-0154-05
關(guān)鍵字: Fe-Al金屬間化合物； 涂層； 高速電弧噴涂； 顯微組織； 高溫滑動(dòng)磨損
MA Shi-ning, ZHANG Wei
（National Laboratory for Remanufacturing,
Academy of Armored Forces Engineering,
Beijing 100072, China）
Abstract:The Fe-Al intermetallics coating was produced by cored wires and high velocity arc spraying (HVAS), and the microstructure and sliding wear behavior from room temperature up to 650℃ of the coating were investigated. The results show that the average chemical composition of the coating is Fe-20.0Al-14.1O (molar fraction, %). The microstructure is found to consist of Fe3Al, FeAl and α-Fe phases mainly, together with fine oxide (Al2O3) layers and a little Al. The results of sliding wear indicate that the Fe-Al coating exhibits low wear rate from room temperature to 650℃. The reason of the friction coefficient decreasing at elevated temperatures is that protective oxide film forms on the worn surface during sliding wear process. And delamination is the predominant wear mechanism of the coatings. Fe3Al and FeAl intermetallics which have higher strength and hardness at elevated temperatures can effectively resist crack initiation, propagation and fracture of splat particles, resulting in excellent high temperature wear resistance of the Fe-Al coating.
Key words: Fe-Al intermetallics; coating; high velocity arc spraying; microstructure; high temperature sliding wear
