Abstract: In present paper a result is deduced from thermo dynamics analysis tfhat it is difficult to form CH₄ between H₂ and graphite,but C is liable to be seized rom Fe₈C by H₂. As a protective atmosphere for sintering iron base materials, dissociated ammonia is a kind of decarburizing atmospheres.
This paper try to make sure by thermo dynamics analysis which kind of chemical reactions can possibly happen when protective atmosphere is dissociatd ammonia during sintering P/M iron-base materials. The effect of dissociated ammonia on sintered materials is discussed. The characteristics of ammogas is further clear.