氧化物与形成该氧化物消耗的金属的体积比（Ｐｉｌｌｉｎｇ－Ｂｅｄｗｏｒｔｈ Ｒａｔｉｏ简称ＰＢＲ）是判断氧化膜完整性的一个重要判据，也是氧化膜内产生生长应力的主要因素之一，已发发表的关于ＰＢＲ的数据都是针对纯金属的，本文基于合金的氧化行为建立了一个简化的模型，给出了合金上形成的氧化物的ＰＢＲ的人体估算了Ａｌ２Ｏ３、ＮｉＯ及Ｃｒ２Ｏ３等几种氧化物膜以及它们的混合膜ＰＢＲ值，合金上氧化物的ＰＢＲ值与合金 成分有关,并与纯金属上形成的同种氧化物的PBR有显著差别.
The volume ratio of an oxide to the metal which undergoes oxidation to form the oxide, known as Pilling-Bedworth Ratio (PBR) ,is an important factor as a criterion of integrity of the oxide on pure metals. PBR is one of main reasons for the generation of the growth stress in the oxide, its value is applied in the analysis of the oxide stress. Up to now, the value of PBR is only concerned with the oxide formed on pure metals. In order to evalu- ate the value of PBR for the oxide formed on alloys, a simple model has been established in the present paper. The data of PBR of the exclusive oxide or the mixed oxide scale on some alloys are obtained. PBR of an oxide on the alloy is different with that on the corresponding pure metal, and is related with the composition of the alloy.
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