Properties of plasma sprayed NiCrAlY+(ZrO₂+Y₂O₃) coating on refractory steel surface

Abstract

NiCrAlY+(ZrO₂+Y₂O₃) thermal barrier coating was prepared on the surface of refractory steel 1Cr18Ni9Ti with plasma spraying technique. The phases and microstructure of the thermal barrier coating were determined by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results show that the bonding between thermal barrier coating and substrate is sound. The surface hardness of 1Cr18Ni9Ti reaches up to 1 000 HV, but that of substrate is only 300 HV. The patterns sprayed with CoNiCrAlY+(ZrO₂+Y₂O₃) ceramic coating have a good heat insulation effect at 800 °C for heat insulation temperature difference reaches 54 °C, which increases the operating temperature and service life of refractory steel.

Keywords

refractory steel / plasma spraying / NiCrAlY+(ZrO₂ + Y₂O₃) / heat insulation effect

References

[1] ZhouHai, ChenFei. Study on oxidation resistance of plasma sprayed CoNiCrAlY+(ZrO₂+Y₂O₃) coating on TiAl alloy[J]. Trans Mater Heat Treat, 2004, 25(2): 35-37(in Chinese)

[2] BrindleyW J, MillerR A. Thermal barrier coating life and isothermal oxidation of low-pressure plasma-sprayed bond coat alloys[J]. Surface and Coatings Technology, 1990, 43–44(1–3): 446-457

[3] CHEN Bing-yi. Thermal barrier coatings of speed development[J]. Engineering of Aviation Manufacture, 1994(6): 25–26. (in Chinese)

[4] EvansA G, HutchisonJ W. On the mechanics of delamination and spalling in compressed films[J]. Int J Solids Structures, 1993, 74(2): 1321-1326

[5] LelaitL, AlperineS, MevrelR. Alumina scale growth at zirconia-McrAlY interface: a microstructural study [J]. J Mater Sci, 1992, 27: 5-12

[6] LuthraK L, BraintC L. Mechanism of adhesion of alumina on McrAlY alloys[J]. Oxid Met, 1986, 26: 397-403

[7] FriisaM, PerssonaC. Influence of particle in-flight characteristics on the microstructure of atmospheric plasma sprayed yttria stablized ZrO₂ [J]. Surface and Coatings Technology, 2001, 145(4): 115-127

[8] KraussM. In-situ particle temperature, velocity and size measurements in the spray forming process[J]. Mater Sci Eng A, 2002, 326: 154-164

[9] WangNing, LuChun-yan. Effect of NiCrAlY coatings on oxidation resistance of Ni-base superalloy K17 [J]. Corrosion Science and Protection Technology, 2002, 14(1): 7-11(in Chinese)

[10] HuChuan-shun, WangFu-hui. Review of progress in thermal barrier coatings[J]. Corrosion Science and Protection Technology, 2000, 12(3): 160-163(in Chinese)

[11] MendelsonM L. Graded thermal barrier coatings: evaluation [J]. Ceramic Engineering and Science Processing, 1994, 15(14): 555-562

[12] RosarioV M. Development of a thermal barrier material using combustion synthesis[J]. Mater Sci Eng C, 1999, 270: 283-290

[13] KhorK A, DongZ L. Plasma sprayed functionally graded thermal barrier coatings[J]. Materials Letters, 1999, 38(6): 437-444

[14] KawasakiA, WatanabeR. Thermal fracture behavior of metal/ceramic functionally graded materials[J]. Engineering Fracture Mechanics, 2002, 69: 1713-1728

[15] KhorK A, GuY W, DongZ L. Mechanical behavior of plasma sprayed functionally graded YSZ/NiCoCrAlY composite coatings[J]. Surface and Coatings Technology, 2001, 139(2–3): 200-206