【摘要】 熔炼了钙的质量分数为0.5%~5.0%,铝的质量分数为9.0%的10种镁合金,研究了Ca的加入对合金阻燃效果的影响.分别取定量的10种合金在700℃的高温下进行氧化增重的测量,并对合金表面的氧化形貌进行了观察.实验结果表明:镁合金加入钙后,其表面在高温下生成了CaO及少量MgO的复合致密氧化膜,这层氧化膜隔绝了空气,阻止了镁的燃烧;当钙的质量分数为3.5%时,可起到良好的阻燃效果.更多还原

【Abstract】 Investigates the effect of Ca addition on the ignition-proof behavior of 10 kinds of molten Mg alloys,in which the Ca content was 0.5wt%～5.0wt% and Al content 9.0wt%.All the specimens of equal weight taken from those alloys were measured at 700 ℃ for their weight increments due to oxidation,and their oxidized surface morphologies were observed.The results revealed that a dense composite CaO film containing a bit of MgO grows up on alloy surface at high temperature after adding Ca to the alloy,and the film is thus isolated from air to prevent Mg from burning.The ignition-proof effect is favorable if the Ca content in Mg alloy is 3.5wt%.更多还原