Method for making sintered products and a metal powder composition therefor
AssigneeHöganäs AB
InventorsBjörn Johansson, Ulf Engström
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Abstract
This invention relates to a metal powder composition for warm compaction. According to the invention, the invention comprises metal powder, graphite, optional binding agent, optional alloying elements and a lubricant essentially consisting of ethylene-bis-stearamide, whereby the mixture before warm compaction has been subjected to treatment with an organic solvent. The invention further relates to a method for making sintered products, whereby an organic solvent is added during the mixing of the metal powder composition and is evaporated before warm compaction.
Claims23
A method for the preparation of a mixture for forming a sintered product, the method comprising the following steps:
- providing a dry mixture of a metal powder, lubricant and optionally one or more additives, wherein the lubricant consists of essentially pure ethylene-bis-stearamide having an acid number less than 8;
- adding and mixing an organic solvent to the metal powder composition obtained, optionally in combination with a binding agent;
- evaporating the solvent;
- and
- forming a shaped article by warm compacting the mixture at a temperature between 60° C. and 200° C.
Dependencies are inferred from the claim text.