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保证镁合金浇注过程中不氧化燃烧的气体中,SF_6气体防燃效果较好,但目前SF_6产品价格比较昂贵,其高温分解产品(如SF_4)对人仍有一定害处,使用中仍须给于一定重视。SO_2气体防燃作用也较强,但对人的中枢神经和呼吸道粘膜非常有害,使用上受到了限制。CO_2虽然不及SO_2、Ar、SF_6和它们的混合气体防燃效果好,但无毒、无味、无腐蚀,而且货源充足、价格便宜。我们经过一年多的探索试
SF6 gas has a good fire-proof effect in the non-oxidizing combustion gas during the pouring process of magnesium alloy. However, the current SF6 product price is relatively expensive, and its pyrolysis products (such as SF4) still have some harmful effects to people and still need to be used Must pay attention. SO 2 gas flame-retardant effect is also strong, but the human central nervous and respiratory mucosa is very harmful to use has been limited. Although CO_2 is less effective than SO_2, Ar, SF_6 and their mixed gases, they are non-toxic, odorless and non-corrosive, and they are plentiful in supply and cheap in price. After more than a year of exploration we tried