Non-isothermal nitridation kinetics of Ti6Al4V in Al2O3-based refractories. Issue 20 (15th October 2022)

• Record Type: Journal Article
• Authors: Xu, Deting; Yu, Renhong; Chen, Xiaolei; Ren, Jiawang; Ren, Hengxing; Huang, Jiangwen; Lian, Fang
• Is Part Of: Ceramics international. Volume 48:Issue 20(2022)
• Page Start: 29554
• Page End: 29560
• Publication Date: 2022-10-15
• Subjects: Ti6Al4V -- Non-isothermal kinetics -- Isoconversional method -- TiN; TG thermogravimetric -- XRD X-Ray Diffraction -- SEM Scanning electron microscopy -- E Activation energy -- A Pre-exponential factor; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.06.207
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: To establish a kinetic model of nitridation of Ti6Al4V in Al2 O3 -based refractories, the non-isothermal nitridation of Ti6Al4V–Al2 O3 composite refractories at various heating rates was investigated using a thermogravimetric (TG) analyzer for large samples. The activation energy (E) and kinetic model (G(α)) for the nitridation of Ti6Al4V were determined using the isoconversional and master plots methods, respectively. The nucleation and growth of nitriding products of the TiN solid solution was the controlling step in the nitridation of Ti6Al4V in Al2 O3 -based refractories. The Avrami-Erofeev kinetic model, depicted by the G(α) = [-ln (1-α)] 4 equation, is the most rational kinetic model. The values of E and A for the nitridation of Ti6Al4V were calculated to be 214.99 kJ/mol and 1.46 × 10 7 (S −1 ), respectively.