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Study of the heat treatment effect on electrical and porosity of Cermet Coating layers (Zro2 – Y2O3) prepared by Thermal Spraying. | ||
| Iraqi Journal of Physics | ||
| Article 1, Volume 7, Issue 10, 2009, Pages 77-83 | ||
| Abstract | ||
| The technical of Flame Thermal Spray had been used in producing a cermet composite based on powders of stabilized zirconium oxide containing amount of Yatteria oxide (ZrO2- 8Y2O3) reiforced by minerals powders of bonding material (Ni-Cr- Al- Y) in different rates of additions (25, 35, 50) on stainless steel base type (304) after preparing it by the way of Grit Blasting. Before heat treatment, the coated cermet layers were characterized for porosity and electric resistivity. All samples were heat treated in vacuum furnace at different temperature and times. The physical tests had been operated after heat treatment and gave best results especially porosity, which found to be reduced dramatically and producing high hardness. The best thickness of coating with bonding material (25%) was (1.5 mm). The resistivity was found to increase after heat treatment but it reduces with increasing the amount of self bonding additions. | ||
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