Method of sintering silicon nitride based materials
AssigneeSandvik AB
InventorsMarianne Collin, Marian Mikus
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Abstract
The present invention relates to a method for sintering of a silicon nitride based material using gas pressure sintering technique. It has been found that using a sintering atmosphere containing nitrogen and 0.1-10 vol-% carbon monoxide a cutting tool material is obtained with improved properties, particularly increased edge toughness, when machining heat resistant alloys.
Claims21
A method for sintering a silicon nitride based material using gas pressure sintering, comprising sintering a silicon nitride based material in a low pressure sintering step followed by a high pressure sintering step wherein the sintering atmosphere contains nitrogen in both said sintering steps and an oxygen-containing gas in an amount equal to an oxygen potential corresponding to that of 0.1-10 volume % of carbon monoxide in at least the high pressure sintering step.
Dependencies are inferred from the claim text.