摘要
为研究石墨烯添加对非晶复合涂层的组织与性能影响,采用等离子熔覆技术在 Q235钢表面熔覆石墨烯、Fe、Cr、Nb、Mo、Si、B元素制备复合涂层,运用XRD、金相显微镜、SEM、热力学分析等手段分析涂层的物相结构组成、微观形貌、热稳定性和硬度.结果表明:复合涂层与基体冶金结合良好;复合涂层主要由NbC和少量Fe-Cr、Cr7 C3 及α-Fe的混合物组成;石墨烯的添加使得涂层晶粒细化,促进了非晶相和碳化物的形成,使得热稳定性和硬度大大提高;1%石墨烯含量的复合涂层组织最为细小致密,过冷液相区最大,热稳定性最好,涂层显微硬度达到6.28 GPa,在熔覆层中添加石墨烯提高了涂层的综合性能.
Abstract
This paper aims to study the effect of graphene addition on the microstructure and proper-ties of amorphous composite coatings.The study involves cladding graphene,Fe,Cr,Nb,Mo,Si and B on the surface of Q235 steel to prepare the composite coatings by using plasma cladding technology,and analyzing the phase structure,microstructure,thermal stability and hardness of the coating by using XRD,metallographic microscope,SEM and thermodynamic analysis.The experimental results show that the combination of the composite coating and matrix metallurgy is good.The composite coating is mainly composed of a mixture of NbC and a small amount of Fe-Cr,Cr7 C3 and α-Fe.The addition of graphene makes the coating grain fine,which promotes the formation of amorphous phase and carbide,and greatly improves the thermal stability and hardness.The composite coating with 1%graphene content has the smallest and densest microstructure,the largest supercooled liquid phase region,the best thermal stabili-ty,and the microhardness of the coating upto 6.28 GPa.The addition of graphene into the cladding layer improves the overall performance of the coating.
基金项目
黑龙江省省属高校基本科研业务费项目(2020-KYYWF-0699)
国家科技期刊平台
NSTL
万方数据