IC6合金NiCoCrAlY涂层在制造过程中的修复研究

Repair of NiCoCrAlY Overlay Coating on Ni_3Al Base Alloy IC6

研究了适用于 IC6合金的 Ni Co Cr Al Y涂层在制造过程中的修复对涂层本身及 IC6合金基体的显微组织和力学性能的影响。结果表明 ,与原始态涂层相似 ,修复态涂层通过扩散层与基体紧密结合 ,涂层 /基体界面处没有任何孔洞和裂缝 ,各元素在涂层、基体之间存在明显的浓度梯度。而且涂层修复对 IC6合金的显微组织和力学性能均没有明显影响。经过 110 0℃ / 90 MPa持久试验后 ,原始态涂层和修复态涂层与 IC6合金基体之间都发生了明显的互扩散 ,涂层中 Mo含量上升到 16 % (质量分数 ,下同 )左右 ,而 Cr和 Co含量下降至 5 %左右 ,但涂层仍然与合金基体结合紧密。因此 ,Ni Co Cr Al

The effect of NiCoCrAlY coating repair during its preparation on coating itself and microstructure and mechanical properties of Ni 3Al base alloy IC6 was studied. The results indicate that the repaired coating connects to base alloy IC6 compactly through diffusion layer, without any cavity and crack at the coating/matrix interface, similar to original coating and there is obvious concentration gradient of all elements between coating and matrix. And coating repair has no obvious effect on the mechanical properties of alloy IC6. After 1100℃/90MPa stress rupture test, the obvious interdiffusion happens between the repaired coating and base alloy, in both of original and repaired coatings, the content of Mo in the coating is up to about 16%(mass fraction), and the content of Cr and Co decreases to about 5%(mass fraction). The coatings still have good adherence to the base alloy. Therefore, the NiCoCrAlY coating repair is feasible.