Sintering with Nitrogen Based Atmospheres

Abstract

The use of nitrogen based atmosphere systems for sintering is now well established both worldwide and in the UK. On the basis of this experience, the atmosphere systems that can be used to replace conventional endothermic and cracked ammonia atmospheres are briefly described and their practical implementation reviewed in terms of advantages and limitations. In particular, the recent application in the UK of a nitrogen-methanol atmosphere system as an alternative to endothermic gas is discussed. In addition to the practical experience gained, a number of laboratory development programmes have been carried out to gain a better understanding of the effect of nitrogen based atmospheres on sintered components. The results of work on high temperature sintering, on the effect of hydrogen level on sulphur content in ferrous compacts, and on nitrogen pick-up in ferrous compacts are reviewed. PM/0345