Sintering behaviour of nanocrystalline titanium nitride powders

Nanocrystalline Ti Produced by Cryomilling and Consolidation by Severe Plastic Deformation

“…To attain a high density of samples, sintering and/or pressing at elevated temperatures is normally used during compaction, but an intensive recrystallization occurring in the material during this process leads to a noticeable grain coarsening [21]. It is evident that the preservation of the nanocrystalline range of grain sizes can be achieved only through a decrease in the temperature and/or an increase in the pressure during pressing.…”

“…Subsequent compaction of ultradispered powders should, first, ensure the fullest consolidation of the sample, and second, preserve the nanostructure of the initial ultradispersed powder [20,21]. To attain a high density of samples, sintering and/or pressing at elevated temperatures is normally used during compaction, but an intensive recrystallization occurring in the material during this process leads to a noticeable grain coarsening [21].…”

Enhancing the sintering ability of TiNx by introduction of nitrogen vacancy defects

“…Conventional sintering of dense TiN bodies from micrometric powders has always been conducted above 1800 1C. Consolidating nanosized or nanocrystalline TiN powder are effective means because of its promising ability to produce dense TiN bodies with improved mechanical properties at temperatures lower than those normally required [5][6][7][8]. Russias et al obtained TiN powders from self-propagating high temperature synthesis and consolidated by hot pressing at 1600 1C after thermal treatment, the relative density of 98% and hardness of $ 18 GPa were achieved [9,10].…”

“…To overcome this problem, researches have focused on investigating advanced sintering techniques or refined microstructures of TiN powder to optimize densification and mechanical properties [5][6][7][8][9][10][11][12]. Conventional sintering of dense TiN bodies from micrometric powders has always been conducted above 1800 1C.…”

Hot pressed titanium nitride obtained from SHS starting powders: Influence of a pre-sintering heat-treatment of the starting powders on the densification process

“…5,6 Investigations about densification and properties of bulk TiN specimens revealed their attractive physical and mechanical properties but also underlined the drastic influence of starting powders on the final characteristics of dense specimens. 7,8 Indeed, the densification stage is dependent of the sintering process but also strongly of the initial starting powder grain size, stoichiometry and oxygen content.…”