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[資源]
P-B比（pilling-bedworth ratio）
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| 金屬與氧結(jié)合在金屬表面生成的氧化物膜中的每個金屬離子體積與金屬中的每個金屬原子體積之比。反映氧化物膜中的應(yīng)力狀況。P-B比在l～2之間的金屬，其表面氧化物膜中產(chǎn)生一定程度的壓應(yīng)力，膜比較致密，金屬抗氧化性強。P-B比小于1或大于2時，氧化物膜中產(chǎn)生張應(yīng)力或過大的壓應(yīng)力，容易造成膜破裂，金屬抗氧化性低 |
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A correlation between the radius of curvature of metallic substrates with strainfree coherent monolayers of oxides and the Pilling-Bedworth ratio was found to follow the expression |R|≈19.5/|φ–1| for a large number of metal- oxide systems in which the metal and the oxide have identical cubic structures. For any given Pilling-Bedworth ratio φ, the radius of curvature of basally oriented hexagonal substrates was lower than that when the surface was perpendicular to the basal plane. Based on the theory of Pilling-Bedworth ratio (PBR) for metals, PBR for oxidation of alloys is suggested as. Three Al2O3 forming alloys (Ni3Al, NiAl and NiAl3) were used as examples to calculate PBR with this method. The results showed significant discrepancies compared with the PBR calculated with aluminium metal. Calculation with the traditional method gave the PBR value for oxidation of Al as 1.29; calculations with the modified method gave the PBR values for Ni3Al, NiAl and NiAl3 alloys as 1.71~1.88, 1.64~1.78, and 1.48~1.57, respectively. |
2樓2007-07-31 14:14:49
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