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<p>The metal-ceramic powdered composite castings of nickel-based powder reinforced with 10% SiC and 10% Al<sub>2</sub>O<sub>3</sub> were successfully processed through <i>in-situ</i> melting via microwave hybrid heating route. The premixed powders of metal – <i>x</i>% ceramics were cast in graphite cavity under suscepting environment. The composites were developed within 15 – 20 minutes of 2.45 GHz microwaves exposure using domestic microwave applicator. Microstructure analysis of developed castings revealed uniform equiaxed grain growths of nickel based metallic powder matrix and uniform dispersed ceramic particles. Results revealed lower visible defects in cast samples and porosity was in the range of 1.25 – 1.28%. Microhardness studies revealed higher hardness of 1200 HV. The present work on <i>in-situ</i> powder melting and casting of composites provides an alternate energy efficient route for Metal Matrix composites processing.</p>

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Microwave Metal-Ceramic in-situ Powder Casting Process: Mechanism and Process

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • S. Singh

摘要

The metal-ceramic powdered composite castings of nickel-based powder reinforced with 10% SiC and 10% Al2O3 were successfully processed through in-situ melting via microwave hybrid heating route. The premixed powders of metal – x% ceramics were cast in graphite cavity under suscepting environment. The composites were developed within 15 – 20 minutes of 2.45 GHz microwaves exposure using domestic microwave applicator. Microstructure analysis of developed castings revealed uniform equiaxed grain growths of nickel based metallic powder matrix and uniform dispersed ceramic particles. Results revealed lower visible defects in cast samples and porosity was in the range of 1.25 – 1.28%. Microhardness studies revealed higher hardness of 1200 HV. The present work on in-situ powder melting and casting of composites provides an alternate energy efficient route for Metal Matrix composites processing.