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为了实现给铝制发动机缸体内壁喷涂铁基耐磨涂层,设计并制造一种新型的适合直径80 mm及以上内孔的电弧喷涂装置。利用所设计的喷涂装置,采用08Mn2Si作为喷涂丝材,分别选用不同的电流和不同的喷涂距离进行喷涂,通过对涂层微观组织比较分析得出,采用电流70 A和喷涂距离70 mm时,完全可以满足对直径80 mm及以上内孔的喷涂,进而对涂层结构研究时发现,在涂层中具有大量铁基氧化物,涂层结合界面上没有大的氧化物、孔隙及夹杂,涂层结合强度高且涂层组织结构由外部到内部基本一致。
In order to achieve an iron-based wear-resistant coating on the inner wall of an aluminum engine block, a new type of arc spraying device suitable for bores with a diameter of 80 mm and above was designed and manufactured. By using the spray device designed, 08Mn2Si was used as the sprayed wire, sprayed with different current and different spraying distance respectively. The microstructure of the coating was compared and analyzed. When the current was 70 A and the spraying distance was 70 mm, Which can meet the requirement of spraying the inner hole with the diameter of 80 mm and above. Furthermore, when the structure of the coating is studied, it is found that there is a large amount of iron-based oxide in the coating and no large oxides, pores and inclusions in the coating- High bonding strength and coating structure from the outside to the interior is basically the same.