Experimental Study on Preparation of Titanium Nitride by Direct Nitridation of Porous Titanium AITranslate

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Chinese Library Classification Number:TQ134.11[化学工程—无机化工]

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At present,titanium nitride is produced mainly by direct nitridation of titanium powder,but the production process requires multiple nitridation,resulting in high energy consumption,Porous titanium prepared by aluminothermic reduction with sodium fluorotitanate as raw material has large specific surface area and good activity.The process of preparing titanium nitride by direct nitridation of porous titanium as raw material is studied in this paper.The phase,microstructure and nitrogen content of the prepared titanium nitride were analyzed by XRD,SEM and ONH,and the influence of nitridation process conditions on nitridation effect was studied.The mechanism of direct nitridation of porous titanium was discussed by thermodynamic analysis and differential thermal-thermogravimetric analysis.The results show that titanium nitride with N content of 20.6%can be prepared by one-stage nitridation under the conditions of nitridation temperature of 1200 C,holding time of 300 min and nitridation pressure of o.100 MPa.The purity of the prepared titanium nitride is high and the overall nitridation effect is good.The nitridation of porous titanium is exothermic.Since the nitridation process is gradually from the surface to the inside and the N element diffuses slowly from particle surface to the inside,the nitridation reaction as a whole is a process of slowly nitriding and gradually increasing nitrogen.