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<p>NiAl-based composites reinforced with TiC and Al<sub>2</sub>O<sub>3</sub> ceramics have attracted significant interest due to their outstanding high-temperature properties. Combustion synthesis is an effective and efficient processing route for producing the ceramic composite. Since the synthesis reaction occurs at high temperature, precise evaluation of the product is essential. This work analyzes the Raman spectra of the NiAl/(TiC–Al<sub>2</sub>O<sub>3</sub>) composite structure produced by combustion synthesis. A mixture of Ni/Al and 5 wt.% TiO<sub>2</sub>/Al/C was used as the reactant system. The combustion synthesis of the mixtures was initiated by induction heating at 300 A after prior compression to 200 MPa. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) tests were conducted simultaneously to verify the phase analysis observed by the Raman spectroscopy systems. The XRD spectra indicate that the formed product predominantly consists of NiAl matrix, reinforced by TiC and Al<sub>2</sub>O<sub>3</sub>, suggesting that the synthesis process has fully completed. The SEM images reveal that the ceramic phases, titanium carbide (TiC) and aluminium oxide (Al<sub>2</sub>O<sub>3</sub>), are unevenly distributed throughout the NiAl matrix. Raman spectra of NiAl, TiC, and Al<sub>2</sub>O<sub>3</sub> were analyzed and compared with those of the raw materials. The Raman peaks of the synthesized Al<sub>2</sub>O<sub>3</sub> were observed at 1369 and 1400 cm<sup>–1</sup>. Whereas, the Raman spectra of the synthesized TiC show two pairs of peak bands, comprising the lower band at 284 and 376 cm<sup>–1</sup>, and the higher band at 589 and 668 cm<sup>–1</sup>, demonstrating the acoustic and optical bands of the TiC spectra, respectively. Surprisingly, the Raman spectra of NiAl are low in intensity. Thus, the phases analyzed by the Raman shift support those observed by SEM and XRD. This work extends the evaluation of the Raman shifts of TiC, Al<sub>2</sub>O<sub>3</sub>, and NiAl, including Ni/Al and Ti/C mixtures. Raman analysis provides a comprehensive assessment of the ceramic composite formed by combustion synthesis and confirms the feasibility of using Raman spectroscopy as a reliable research method.</p>

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Raman Spectra of NiAl/(TiC–Al2O3) Composite Produced by Combustion Synthesis

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Tri Widodo Besar Riyadi,
  • Dessy Ade Pratiwi,
  • Akida Mulyaningtyas

摘要

NiAl-based composites reinforced with TiC and Al2O3 ceramics have attracted significant interest due to their outstanding high-temperature properties. Combustion synthesis is an effective and efficient processing route for producing the ceramic composite. Since the synthesis reaction occurs at high temperature, precise evaluation of the product is essential. This work analyzes the Raman spectra of the NiAl/(TiC–Al2O3) composite structure produced by combustion synthesis. A mixture of Ni/Al and 5 wt.% TiO2/Al/C was used as the reactant system. The combustion synthesis of the mixtures was initiated by induction heating at 300 A after prior compression to 200 MPa. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) tests were conducted simultaneously to verify the phase analysis observed by the Raman spectroscopy systems. The XRD spectra indicate that the formed product predominantly consists of NiAl matrix, reinforced by TiC and Al2O3, suggesting that the synthesis process has fully completed. The SEM images reveal that the ceramic phases, titanium carbide (TiC) and aluminium oxide (Al2O3), are unevenly distributed throughout the NiAl matrix. Raman spectra of NiAl, TiC, and Al2O3 were analyzed and compared with those of the raw materials. The Raman peaks of the synthesized Al2O3 were observed at 1369 and 1400 cm–1. Whereas, the Raman spectra of the synthesized TiC show two pairs of peak bands, comprising the lower band at 284 and 376 cm–1, and the higher band at 589 and 668 cm–1, demonstrating the acoustic and optical bands of the TiC spectra, respectively. Surprisingly, the Raman spectra of NiAl are low in intensity. Thus, the phases analyzed by the Raman shift support those observed by SEM and XRD. This work extends the evaluation of the Raman shifts of TiC, Al2O3, and NiAl, including Ni/Al and Ti/C mixtures. Raman analysis provides a comprehensive assessment of the ceramic composite formed by combustion synthesis and confirms the feasibility of using Raman spectroscopy as a reliable research method.