Research and Development > JFE TECHNICAL REPORT > No.16 Special Issue on “Engineering,” “Steel Section Products,” and “Iron and Steel Powders” > Analysis of Dewaxing Behavior of Iron Powder Compacts Based on a Direct Observation of Decomposing Lubricant During Sintering in a Furnace

No.16 Special Issue on “Engineering,” “Steel Section Products,” and “Iron and Steel Powders”

Analysis of Dewaxing Behavior of Iron Powder Compacts Based on a Direct Observation of Decomposing Lubricant During Sintering in a Furnace

KAWANO Takashi   ONO Tomoshige   OZAKI Yukiko

Abstract

Dewaxing behavior of iron powder compacts containing zinc stearate (ZnSt) or ethylene-bisstearamide (EBS) was directly observed during sintering. First, small droplets of lubricant melt appeared scattered on the surface. Then, they gradually formed large pools, and finally vaporized. In addition, melt of ZnSt more remarkably bubbled than that of EBS during vaporization. After sintering the compact containing ZnSt in nitrogen, spot stains of rough surface and concentrated zinc with the diameter of 1 mm were found on the top of their surface. It is believed that the lubricant melt inhomogeneously flew out through the easier paths in the compacts to the surface accompanied by the exhausting gas of the decomposed lubricants.

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