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氧化物与形成该氧化物消耗的金属的体积比（ Ｐｉｌｌｉｎｇ Ｂｅｄｗ ｏｒｔｈ Ｒａｔｉｏ，简称 Ｐ Ｂ Ｒ）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． 已发表的关于 Ｐ Ｂ Ｒ 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 Ｐ Ｂ Ｒ 的计算公式． 具体估算了 Ａｌ２ Ｏ３、 Ｎｉ Ｏ 及 Ｃｒ２ Ｏ３ 等几种氧化物膜以及它们的混合膜的 Ｐ Ｂ Ｒ 值． 合金上氧化物的 Ｐ Ｂ Ｒ 值与合金成分有关， 并与纯金属上形成的同种氧化物的 Ｐ Ｂ Ｒ 有显著差别
The Pilling-Bedw orth ratio (P B R) is an important criterion for judging the integrity of oxide films and is also one of the main factors that cause the growth stress in oxide films. Published data on P B R are for pure metals. In this paper, a simplified model was established based on the oxidation behavior of the alloy, and the formula for calculating P B R for the oxides formed on the alloy was given. The specific P B R values of several oxide films, such as Al 2 O 3, NiO and Cr 2 O 3, and their mixed films were estimated. The P B R value of the oxide of the alloy is related to the composition of the alloy and is significantly different from the P B R of the same type of oxide formed on the pure metal