... is used to puff edible oils, mayonnaise, margarine in barrel or peanut oil products for increasing their volumes and ... , nitrogenizing, furnace washing and blowing, etc. Used in fields such as metal heating treatment, powder metallurgy, magnetic ... , agglomeration, anneal, deoxidization, storage of electronic products. Used in fields such as peak welding, circumfluence welding, crystal, piezoelectricity ...