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<p>Alumina (Al<sub>2</sub>O<sub>3</sub>) is the most widely utilized ceramics for high temperature applications owing to its superior mechanical performance and heat-resistant behavior. In this study, Al<sub>2</sub>O<sub>3</sub> ceramics was processed using direct ink writing (DIW), which is a subset of extrusion assisted 3D printing technology. The rheological characteristics of the slurry was evaluated and green body was printed using 66.7% solid loading using methyl cellulose (MC) as the binding agent. The slurry exhibited viscoelastic properties which ensured continuous and smooth printing process. Simultaneous TG-DTA studies on green bodies were performed to establish the optimal binder burnout step and densification process. The effect of firing temperature on physical characteristics, mechanical characteristics and microstructural features were investigated comprehensively. The findings revealed that with increase in consolidation temperature, enhancement in density and mechanical performance was observed. The sintered Al<sub>2</sub>O<sub>3</sub> components attained the maximum bulk density of 3.69&#xa0;g/cm<sup>3</sup> and fracture strength of 35.46&#xa0;MPa at sintering temperature of 1700 °C with a mean crystallite size of 1.95 <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:{\upmu\:}\text{m}.\:\)</EquationSource> </InlineEquation>The current research work highlighted the capability to produce complex shape geometries using DIW of Al<sub>2</sub>O<sub>3</sub> ceramics employing MC as additive and sintering temperature was optimized to tailor the microstructural features and mechanical behavior of 3D printed components.</p>

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Design and processing of alumina ceramics through direct ink writing: insights into mechanical–microstructural characterization

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Gaurav Prakash,
  • Sukhomay Pal,
  • P. S. Robi

摘要

Alumina (Al2O3) is the most widely utilized ceramics for high temperature applications owing to its superior mechanical performance and heat-resistant behavior. In this study, Al2O3 ceramics was processed using direct ink writing (DIW), which is a subset of extrusion assisted 3D printing technology. The rheological characteristics of the slurry was evaluated and green body was printed using 66.7% solid loading using methyl cellulose (MC) as the binding agent. The slurry exhibited viscoelastic properties which ensured continuous and smooth printing process. Simultaneous TG-DTA studies on green bodies were performed to establish the optimal binder burnout step and densification process. The effect of firing temperature on physical characteristics, mechanical characteristics and microstructural features were investigated comprehensively. The findings revealed that with increase in consolidation temperature, enhancement in density and mechanical performance was observed. The sintered Al2O3 components attained the maximum bulk density of 3.69 g/cm3 and fracture strength of 35.46 MPa at sintering temperature of 1700 °C with a mean crystallite size of 1.95 \(\:{\upmu\:}\text{m}.\:\) The current research work highlighted the capability to produce complex shape geometries using DIW of Al2O3 ceramics employing MC as additive and sintering temperature was optimized to tailor the microstructural features and mechanical behavior of 3D printed components.