在Ni-30Al(mass%,下同)和Ni-20Cr-10Al铸态合金上进行粉末包埋渗铝,分别得到纯β-NiAl相涂层和β-(Ni,Cr)Al相涂层.在这两种渗铝试样和铸态Ni-20Cr-13Al合金(含β-NiAl、γ'-Ni_3Al、α-Cr相)上涂覆了硫酸钠薄膜,进行900℃热腐蚀测试.经过10小时热腐蚀测试后,三种试样表面均生成Al_2O_3膜.腐蚀动力学分析表明,Cr对提高材料的抗热腐蚀性能是有益的;Ni-20Cr-10Al渗铝涂层试样的增重最低,仅为铸态Ni-20Cr-13Al合金试样增重的80%左右,Ni-30Al渗铝涂层试样增重的50%左右.
Hot corrosion behavior of three β-NiAl phase materials, namely aluminized Ni-30Al (mass%) and Ni-20Cr-10Al,and a bare cast alloy Ni-20Cr-13Al, was studied. The aluminized layer of Ni -30Al was simple β-NiAl, and the aluminized layer of Ni-20Cr-10Al consisted of β-(Ni, Cr)Al, and the cast Ni-20Cr-13 Al consisted of β-NiAl, γ'-Ni_3Al and α-Cr. The specimens were coated by Na_2SO_4 films, and test-ed in air at 900℃ for 10 h. After tests ,only alumina scales were detected on the surfaces of all the speci-mens. The kinetic curves of the hot corrosion tests demonstrated that Cr is beneficial to the hot corrosion resistance of the β-NiAl phase materials. The mass gain of the aluminized Ni-20Cr-10Al was 20% lower than that of the cast Ni-20Cr-13Al,and was as half as that of the aluminized Ni-30Al.
参考文献
| [1] | Coward G W.Progess in coatings for gas turbine airfoils[J].Surface and Coatings Technology,1998,108-109(1-3):73. |
| [2] | Niu Y,Zhang X J,Wu Y,et al.The third-element effect in the oxidation of Ni-xCr-7Al(x =0,5,10,15 at.%)alloys in 1atin O_2 at 900 ～ 1000℃[J].Corrosion Science,2006,48(12):4020. |
| [3] | 张志刚,牛焱,张学军.铁-铬-铝合金中铬的第三组元作用[J].钢铁研究学撤,2007,19(7):46. |
| [4] | 张志刚,张学军,潘太军,等.Fe-Al和Fe-Cr-Al合金在高温下的初期氧化[J].钢铁研究,2007,35(3):38. |
| [5] | 范瑞麟.NiCrAlY涂层的铬含量及结构对热腐蚀寿命的影响[J].航空材料学报,1998,18(1):45. |
| [6] | Luthra K L,Wood J H.High chromium cobalt-base coatings for low temperature hot corrosion[J].Thin Solid Films,1984,119 (3):271. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%