塩化アンモニウムを混合したチタンおよびジルコニウムの高温高圧アンモニア中における窒化

概要

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Titanium and zirconium powders did not yield nitrides effectively by the treatment in pressurized ammonia of 1 MPa and above, at 700°C for 3 h. The addition of NH4Cl was effective for the nitridation of Ti and Zr. Reactions of titanium powder (99.1 % up) mixed with 10 wt% (9.2 mol%) ammonium chloride have been studied at 300-700°C under 0.1 or 1 MPa NH3 (initial pressure) for 3 h. Ti and NH4CI did not react at 300°C, but formed TiH1.924 at 400°C, and then TiH1.924 changed into TiN above 500°C. When the sample of Ti-10 wt% NH4Cl was heated at 300-600°C under 0.4 MPa Ar gas for 3 h, TiH1.924 was produced at 400°C and above, but TiN was not produced. When the sample of Zr-10 mol% (6 wt%) NH4Cl was heated under 0.1 or 1 MPa NH3, ZrN was formed above 600°C through the formation of ZrH and ZrH2 above 400°C. A small amount of β-ZrNCI was also produced at 700°C under the same conditions.
社団法人粉体粉末冶金協会の論文