(1.哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院,哈爾濱 150001;
2.吉林工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院, 長(zhǎng)春 130025)
摘 要: 鎂合金在壓鑄過(guò)程中容易發(fā)生氧化燃燒,在目前的阻燃方法中,以添加合金元素法的效果最明顯。作者通過(guò)對(duì)添加富鈰稀土的研究,認(rèn)為富鈰稀土的添加同樣對(duì)鎂合金的阻燃具有顯著作用,例如添加1%的富鈰稀土,起燃溫度提高約170℃,可直接暴露在大氣中熔煉鎂合金。掃描電鏡和X射線衍射分析表明,稀土的分布由試樣的內(nèi)部向表面逐漸增多,鎂合金表面膜基體金屬中原來(lái)的MgO疏松結(jié)構(gòu)轉(zhuǎn)變?yōu)橛蒑gO, Ce2O3和Al2O3及Mg17Al12組成的復(fù)合致密結(jié)構(gòu),具有很好的防燃效果。由此結(jié)論為:具有豐富鎂、稀土資源的中國(guó),應(yīng)將鎂合金防燃研究的重點(diǎn)放在添加稀土、防止鎂合金氧化燃燒這方面,以促進(jìn)鎂合金在我國(guó)的廣泛應(yīng)用。
關(guān)鍵字: 鎂合金; 富Ce稀土; 起燃溫度
ignition temperature of magnesium alloy
(1. Harbin Institute of Technology, Harbin 150001, P.R.China;
2. Jilin University of Technology, Changchun 130025, P.R.China)
Abstract:It has been testified by experiment that by the addition of Ce, the ignition temperature of magnesium alloy was raised by 170 ℃. The results of SEM analysis indicate that the content of Ce is raised from inside to outside. In magnesium alloy, rare-earth is prone to reactwith MgO. The results of XRD indicate that oxide film on the surface of ignition-proof magnesium alloy can change from loose structure of simple MgO to compact composite structure consisting of MgO, Ce2O3, Al2O3 and Mg17Al12, which has excellent ignition-proof effect. Therefore the study should be beneficial to the application of magnesium alloy.
Key words: magnesium alloy; Ce rare-earth; ignition temperature


