Spark plasma sintering of silicon carbide and multi-walled carbon nanotube reinforced zirconium diboride ceramic composite

作者：Yadhukulakrishnan Govindaraajan B; Rahman Arif; Karumuri Sriharsha; Stackpoole Margaret M; Kalkan A Kaan; Singh Raman P; Harimkar Sandip P^*

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2012, 552: 125-133.

DOI：10.1016/j.msea.2012.05.020

• Sintering
• Ceramics
• Zirconium diboride
• Silicon carbide
• Carbon nanotubes

In this paper spark plasma sintering (SPS) of silicon carbide and multi-walled carbon nanotube reinforced zirconium diboride ultra-high temperature ceramic matrix composites is reported. Systematic investigations on the effect of reinforcement type (SiC and CNTs) and content (10-40 vol.% SiC and 2-6 vol.% CNTs) on densification behavior, microstructure development, and mechanical properties (microhardness, biaxial flexural strength, and indentation fracture toughness) are presented. With the similar SPS processing parameters (1900 degrees C, 70 MPa pressure, and 15 min soaking time), near-full densification (%26gt;99% relative density) was achieved with 10-40% SiC (in ZrB2-SiC) and 4-6% CNT (in ZrB2-CNT) reinforced composites. The SiC and CNT reinforcement further improved the indentation fracture toughness of the composites through a range of toughening mechanisms, including particle shearing, crack deflection at the particle-matrix interface, and grain pull-outs for ZrB2-SiC composites, and CNT pull-outs and crack deflection in ZrB2-CNT composites.

• 出版日期2012-8-30