High-Performance Zirconium Disilicide Ceramics Fabricated via High-Pressure and High-Temperature Sintering

Area of Science:

• Materials Science and Engineering
• Ceramic Engineering
• Solid State Chemistry

Background:

• Zirconium disilicide (ZrSi2) ceramics possess desirable physical and chemical properties for demanding industries.
• Limited research exists on the preparation and comprehensive properties of ZrSi2 ceramics.
• Understanding ZrSi2 characteristics is crucial for optimizing its industrial applications.

Purpose of the Study:

• To comprehensively investigate the characteristics of zirconium disilicide (ZrSi2) ceramics.
• To prepare dense bulk ZrSi2 ceramic samples using an advanced sintering technique.
• To evaluate the mechanical, electrical, and oxidation resistance properties of the prepared ZrSi2.

Main Methods:

• Preparation of dense bulk ZrSi2 ceramic samples via high-pressure-high-temperature (HPHT) sintering.
• Characterization of mechanical properties, including Vickers hardness and fracture toughness.
• Investigation of electrical conductivity through experimental and theoretical approaches.
• Determination of oxidation resistance using simultaneous thermal analysis.
• Microstructural analysis utilizing electron backscatter diffraction (EBSD).

Main Results:

• HPHT sintering yielded ZrSi2 ceramic samples with high density.
• Achieved Vickers hardness of 10.9 ± 0.28 GPa and fracture toughness of 4.84 ± 0.5 MPa·m^1/2.
• Oxidation onset temperature exceeded 1400 °C, indicating excellent oxidation resistance.
• Electrical conductivity was investigated through combined experimental and computational methods.

Conclusions:

• HPHT sintering is an effective method for enhancing the mechanical properties and oxidation resistance of ZrSi2 ceramics.
• The study provides valuable insights into the preparation and utilization of ZrSi2 ceramics.
• Optimized ZrSi2 ceramics show potential for advanced applications in aerospace, energy, and chemical sectors.