Solid-particle erosion of directionally solidified Al₂O₃–ZrO₂ (Y₂O₃) eutectics

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• 作者：K.C. Goretta ; J.I. Pe&#xf1 ; a ; V.M. Orera ; Nan Chen ; D. Singh ; J.L. Routbort
• 关键词：Eutectic ceramic ; Directional solidification ; Erosion ; Mechanical properties
• 刊名：Wear
• 出版年：2010
• 出版时间：4 February 2010
• 年：2010
• 卷：268
• 期：3-4
• 页码：571-578
• 全文大小：1839 K

文摘

Resistance to solid-particle erosion was studied by measuring individual damage sites in directionally solidified Al₂O₃–ZrO₂ (Y₂O₃) eutectics that contained three concentrations of Y₂O₃ (0.5, 3, and 9 % in the ZrO₂ phase). For comparison, polycrystalline Al₂O₃, sapphire, and polycrystalline and single-crystal tetragonally stabilized ZrO₂ were also studied. All specimens were impacted at normal incidence by angular 63 and 143 μm SiC particles traveling at 100 m/s. The eutectics containing 3 % and 9 mol. % Y₂O₃ generally exhibited the smallest damage zones and the ZrO₂ specimens exhibited by far the largest damage zones. Examination of damage features and comparison with basic mechanical properties and models for erosion of brittle materials led to conclusions that the eutectics were resistant to erosion because of the presence of large compressive residual stresses in their Al₂O₃ phases and that the ZrO₂ materials were susceptible to erosive damage because transformation toughening was ineffective in reducing propagation of lateral cracks that emanated from the damage sites.