为提高垃圾焚烧炉过热器的抗高温氧化和磨损性能,采用两种不同硼含量的NiCrB粉芯丝材,通过电弧喷涂方法在SA213-T2钢基体表面制备涂层,并对涂层的微观组织结构、高温氧化行为和显微硬度与商用NiCrTi涂层进行对比研究.结果表明:制备的NiCrB涂层呈典型的层状结构,孔隙率约为3％,氧化物含量较低,涂层的显微硬度明显高于NiCrTi涂层.NiCrB涂层在800℃下的氧化增重明显低于基体,其中B含量较低的NiCrB涂层氧化动力学曲线呈典型的抛物线形式,表面生成了连续致密的Cr2O3氧化膜,有效阻止了氧向涂层内部的渗透,对基材起到较好的防护作用,抗高温氧化性能略低于NiCrTi涂层.
In order to improve the high-temperature oxidation and wear resistance of the superheat tubes in waste incinerators,NiCrB coatings were prepared on SA213-T2 steel surface by arc spraying using two types of NiCrB cored wires with different boron contents.Microstructure,high-temperature oxidation behavior and microhardness of the NiCrB coatings were investigated,and compared with the commercial NiCrTi coating.The results show that the NiCrB coatings exhibit dense layered structure with low oxides and porosity about 3％.The microhardness of the NiCrB coatings is obviously higher than that of the NiCrTi coating.Thermo-gravimetric analysis was used to evaluate the high-temperature oxidation behavior of the Ni-based coatings at 800 ℃ under cyclic oxidation condition.The high-temperature oxidation resistance of the NiCrB coating with lower boron content is slightly lower than that of the NiCrTi coating.Due to the compact Cr2O3 film formed on the coating surface,the penetration of oxygen to internal coating is inhibited.
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