Investigation of the oxidation resistance of the HfB2-HfC-TiC-B4C quaternary composite

Articles in Press

Document Type : Original Articles

Authors

• parisa chenari ¹
• zohre balak ²
• vahide shahedifar ³

¹ department of materials science

² Department of materials science

³ urmia university

10.22067/jmme.2025.89633.1155

Abstract

In this research,the oxidation resistance of HfB2-HfC-TiC-B4C four-component composites with equal molar ratios of 7:1:1:1 with and without niobium has been investigated. For this purpose, four composites 70HfB2-HfC-TiC-B4C, 70HfB2-HfC-TiC-B4C/Nb, HfB2-HfC-TiC-B4C and HfB2-HfC-TiC-B4C/Nb were sintered by spark plasma (SPS) method at the temperature of 2000 C, holding time of 25 min, under the pressure of 35 MPa. The oxidation resistance of the samples was investigated at 1200 degrees Celsius and 20 minutes holding time by Thermogravimetric analysis (TG) and DTA methods simultaneously. Phase identification and microstructural investigations were done by X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods, respectively. The results showed that the oxide scale formed in all samples is HfO2 phase. It was found that samples with equal molar ratio (1:1:1:1) have higher oxidation resistance than samples with 7:1:1:1 ratio. The presence of niobium also causes the formation of a denser oxide shell and thus improves oxidation resistance.

Keywords

• Oxidation resistance
• Thermal analysis
• Ultra high temperature ceramic
• spark plasma sintering

Main Subjects

• Ceramics

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