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早在七十年代初,国外就开始重视铁基粉末冶金零件在氮基气氛中烧结的研究。1971年初在粉末冶金工厂中试用,但目前已相当普及。例如美国Webster—Hoff公式用氮基气氛生产的材料有不锈钢、铁、黄铜、青铜、铝及其他合金。有的预计:将来美国作为烧结保护气氛的天然煤气中90％改用氮基气氛时,那么每吨粉末冶金制品可节省能耗4.0 ×10Btu,即占全部粉末冶金制品生产能耗的10％。
As early as the early seventies, foreign countries began to attach importance to the sintering of iron-based powder metallurgy parts in a nitrogen-based atmosphere. In early 1971 in the powder metallurgy factory trial, but has been quite popular. For example, the United States Webster-Hoff formula using nitrogen-based atmosphere materials are stainless steel, iron, brass, bronze, aluminum and other alloys. Some predict that in the future, when 90% of natural gas in the US as a sintering atmosphere is switched to a nitrogen-based atmosphere, the energy consumption per ton of powder metallurgy products will be saved to be 4.0 × 10 8 tons, accounting for 10% of the total energy consumption of the powder metallurgy products.