【摘要】 比较分析了部分合金元素及其氧化物的电负性、氧化反应Gibbs自由能变及相关物性参数。指出碱土金属与稀土金属元素是镁合金合金化阻燃的主要元素,其中Be最为有效。鉴于Be有较大毒性、Ca对镁合金力学性能有不良影响,稀土元素是其主要的代用品。测试了在AZ91镁合金中加入少量纯稀土元素Ce后的氧化点与燃烧点。结果表明,随Ce加入量的增加,氧化点与燃烧点均呈上升趋势。Ce加入量为1%时氧化点与燃烧点的平均值较AZ91分别提高了33℃和61℃。少量添加Ce时氧化点与燃烧点上升较快,随着Ce含量提高,上升幅度减慢。从阻燃的角度讲添加量在0.6%左右即可。更多还原

【Abstract】 The electro-negativities, Gibbs free energy of oxidation reaction and physical properties of some alloying elements and their oxides were compared. It is pointed out that alkaline earth and rare earth elements are dominant in ignition-proof of is used to, especially Be element. RE elements is used to substituting Be and Ca due to high toxicity of Be and be inferior to mechanical properties of the Mg alloy with Ca. The oxidation and ignition temperatures of AZ91 magnesium alloy with somew hat Ce addition were measured. The results show that although the oxidation and ignition temperatures of the alloy are raised, their increasing velocity is slowed with Ce addition increase, increasing by 33 ℃ and 61 ℃, respectively, with 1% Ce addition, compared with those of the AZ91 magnesium. The advisable Ce addition is about 0.6% for ignition-proof AZ91Mg alloy.更多还原