Fire-Proof Evaluation of CaO Added Mg-3Al, Mg-6Al, and Mg-9Al Mg Cast Products

Mg products are easily oxidized and burned when they are exposed to high temperature or fire by accident. In order to solve these problems, the fire-proof solution has been developed by adding CaO in Mg alloys. The fire-proof was evaluated by three methods: quantitative DTA for small sphere specimen, furnace ignition test for burrs and machined chips, and torch ignition test for products. DTA was carried out for obtaining quantitative ignition temperature data with respect to specimen geometry and test environment; the furnace ignition test for burr and chip ignition temperature data; and the torch test for ignition temperature data for manufactured products. This paper discusses the results of fire-proof properties of 1wt.%, and 1.5wt.% CaO added Mg-3Al, Mg-6Al, and Mg-9Al Mg alloys compared with other high temperature Mg alloys such as AE44, AS21, MRI153, and MRI230. Eco-Mg alloy will be low-cost and fire-proof Mg alloys for airplane and train applications in terms of preventing poisonous gas generation, inhalation bum, and ignition generation.