摘要
利用自行开发的温度采集系统,测试了加入少量稀土元素Ce的块状AZ91D镁合金及其熔体在加热过程中表面与心部的温度-时间曲线。发现在该曲线上存在两个温度加快上升的拐点,分别与合金及其熔体表面产生"菜花状"氧化物和明火燃烧现象相对应,将其分别定义为氧化点和燃烧点。合金及其熔体心部温度-时间曲线与表面相似,但存在一定的时间滞后。测试表明,随Ce含量的增加,氧化点与燃烧点均呈上升趋势。w(Ce)=1%时,氧化点与燃烧点的平均值较AZ91D的分别提高了33℃和61℃。少量添加Ce时氧化点与燃烧点上升较快,随其含量提高,上升幅度减慢。Ce含量在w(Ce)=0.6%左右即可。
The superficial and interior temperature-time curves in heating process of blocky AZ91D magnesium alloy added with cerium （Ce） and its melt were measured with temperature collection system developed by our self. Two inflection points with quickly raising of temperature are found on the curve, which correspond with the phenomena of formation of ＂cauliflower＂ oxide and occurrence of flame on the surface of the alloy and its melt respectively. The two temperatures of the inflection points are defined as oxidation point and ignition point respectively in this paper. The interior temperuture-time curve is similar to the superficial curve but exist a lag on time. The oxidation and ignition temperature increase with increasing of Ce content, for example, their average amount increased by 33℃ and 61℃ respectively when w（Ce） = 1.0%. The increasing rate of the oxidation and ignition temperature de- crease with increasing of Ce addition, and the advisable amount is about w（Ce） = 0.6% for ignition-proof of AZ91D magnesium alloy.
出处
《轻合金加工技术》
CAS
北大核心
2008年第2期42-44,57,共4页
Light Alloy Fabrication Technology
关键词
AZ91D镁合金
铈
阻燃
燃点
测试方法
AZ91D magnesium alloy
cerium
ignition resistance
ignition point
measurement technology
