碳化硼对电弧喷涂涂层性能的影响

Effect of boron carbide on properties of arc spraying coatings

关键词:  碳化硼  磨损  电弧喷涂  粉芯丝材

Key words:  boron carbide  wear  arc spraying  cored wire

摘要:

将碳化硼(B₄C)陶瓷粉末和其它合金元素与304L不锈钢带轧制成粉芯丝材,采用电弧喷涂技术制备金属陶瓷复合涂层.研究了B₄C在电弧喷涂中的应用.利用XRD,SEM对涂层的形貌、相组成和磨损表面进行了分析.利用自行设计的高温磨粒磨损装置和高温冲蚀设备分别评价了B₄C对涂层耐高温磨粒磨损性能和耐高温冲蚀性能的影响.结果表明,粉芯丝材喷涂工艺良好,B₄C陶瓷与粉芯中其它组分反应,可以形成含Fe₃B,CrB,Fe_xNi_23-xB₆,Fe₂₃(C,B)₆,(Cr,Fe)₇C₃和Fe₃C等硬质相的复合涂层,大幅度提高了涂层的硬度和耐磨耐冲蚀性能.

Abstract:

A cored wire containing the boron carbide ceramic powder and other alloying elements powder was fabricated with 304L stainless steel sheath and the metal ceramic composite coating was deposited by arc spraying.The feasibility of boron carbide in the application of arc spraying was studied.The microstructure,phase compositions and worn surface morphologies of the coatings were analyzed by means of scanning electron microscopy and X-ray diffraction.High temperature abrasive wear performance and erosion performance were evaluated by high-temperature abrasive wear tester designed by authors and high temperature erosion devices,respectively.The results show that the cored wires have good process ability for arc spraying.The composite coatings contains Fe₃B,CrB,FexNi_23-xB₆,Fe₂₃(C,B)₆,(Cr,Fe)₇C₃ and Fe₃C hard phases due to the in-situ synthesis of B₄C ceramic particle with other alloying elements powder,which result in a significant increase in the hardness,wear-resistantance and erosion-resistantance of the coating.