Study on gelcasting process of alloy powder made of grinding mud
The steel powder was separated from grinding mud produced in Knife and scissors industry.A new al-loy powder was prepared by adding appropriate amount of elements to the purified grinding mud steel powder.Gel-casting process using the hydroxyethyl methacrylate as organic monomer and the tetraethylene glycol dipropylen-ate as crosslinker was investigate respectively.Sintered body with good surface condition was obtained after de-moulding,drying and sintering the green body at 1 400 ℃ for 2 h.The microstructure of the sintered body is com-posed of pearlite,carbide and micropore.The as-sintered specimen was then quenched at 1 050 ℃ and tempered at 180 ℃,respectively.Hardness of the sample after heatreatment is 50HRC.After 3 h salt spray test with 5％sodi-um chloride aqueous solution,the corrosion degree of the as-heattreated sintered body is much lower than that of sintered bodys without heat treatment.It shows that sintered alloys made of grinding mud alloy have good corrosion resistance after quenching and low temperature tempering.
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