Scholarlink

<p>The present study deals with the effect of silicon carbide (SiC) reinforcement on the densification, microstructure, mechanical properties, and electrical discharge machinability of TaC ceramics processed via spark plasma sintering. Two-stage sintering with an optimum sintering temperature of 1900&#xa0;°C was used to achieve a relative density of ~ 97% for monolithic TaC ceramics, whereas a relative density of &gt; 98% was obtained for TaC—(20 to 65 vol%) SiC powder mixtures with single-stage sintering at 1800&#xa0;°C. Besides facilitating densification, SiC addition restricted the growth of TaC grains. The hardness of TaC-SiC composites increased with an increase in SiC content, whereas fracture toughness increased beyond 50 vol% SiC addition. Wire-electrical discharge machining (EDM) revealed that TaC–35 vol% SiC composite offered the best combination of machinability (material removal rate of 11.8&#xa0;mg/min) and surface finish (surface roughness of 1.58&#xa0;µm). These results highlight the potential of TaC–SiC composites for fabricating critical end, complex-shaped components for advanced strategic structural applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Spark Plasma Sintering of TaC and TaC-SiC Composites: Densification, Microstructure and Electrical Discharge Machinability

  • 期刊论文

  • 发表日期：

    2026年7月18日

查看全文
  • Smita Pandey,
  • Chodisetti Surya Prakasarao,
  • B. Venkata Manoj Kumar

摘要

The present study deals with the effect of silicon carbide (SiC) reinforcement on the densification, microstructure, mechanical properties, and electrical discharge machinability of TaC ceramics processed via spark plasma sintering. Two-stage sintering with an optimum sintering temperature of 1900 °C was used to achieve a relative density of ~ 97% for monolithic TaC ceramics, whereas a relative density of > 98% was obtained for TaC—(20 to 65 vol%) SiC powder mixtures with single-stage sintering at 1800 °C. Besides facilitating densification, SiC addition restricted the growth of TaC grains. The hardness of TaC-SiC composites increased with an increase in SiC content, whereas fracture toughness increased beyond 50 vol% SiC addition. Wire-electrical discharge machining (EDM) revealed that TaC–35 vol% SiC composite offered the best combination of machinability (material removal rate of 11.8 mg/min) and surface finish (surface roughness of 1.58 µm). These results highlight the potential of TaC–SiC composites for fabricating critical end, complex-shaped components for advanced strategic structural applications.