Effect of hydrogen on improving purity of WC and AlN powders*1

Effects of reduction atmosphere and nano carbon powder addition on the deoxidization of injection molded aluminum nitride parts

“…Indeed, there are different quantities of residual carbon content in the specimens, which accounted for the deviation of the slope from the value predicted by the chemical reaction leading to the product of CO. The other factor that led to such a deviation was that the residual carbon contents for the specimens thermally treated in N 2 -3%H 2 were lower than those counterparts in N 2 , caused by the reaction between carbon and hydrogen (Trefilov et al, 1996;Trefilov and Morozova, 2003).…”

Role of hydrogen in production of materials for space-system engineering by powder metallurgy methods

“…The method of hydrogen-thermal treatment (HTT) of powders of non-metal refractory compounds (BN, AlN, Si 3 N 4 ) was developed at the Institute and it is of great interest [2,3].…”

Purification of Aluminum Nitride Powder with Heat Treatment in Hydrogen

“…The formation of volatile compounds of hydrogen makes it possible to use hydrogen heat treatment (HHT) for purifying powder from a number of impurities [2,3].…”

“…The results of modelling were compared with experimental data [3]. Modelling was carried out by means of an ASTRA program [4].…”

“…The authors have carried out HHT for aluminum nitride [3]. The composition of impurities for used AlN powder (Table 4) differs somewhat from that taken for calculations, and the hydrogen pressure was 0.1 MPa, although this does not hinder qualitative comparison of the results.…”