Densification Behavior and Mechanical Properties of Spark Plasma Sintered ZrC-SiC and ZrC-SiC-CNT Composites


Sagdic S., Göller G.

JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY, vol.50, no.2, pp.76-82, 2014 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 50 Issue: 2
  • Publication Date: 2014
  • Journal Name: JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.76-82
  • Istanbul Technical University Affiliated: Yes

Abstract

ZrC-SiC and ZrC-SiC-CNT composites containing 0-30 vol% SiC and 0.25-1 wt% CNT were prepared by spark plasma sintering at 1750-1850 degrees C for 300 s under a pressure of 40 MPa. Fully dense ZrC based composites with a relative density of approximately 99% were obtained. The hardness of ZrC-SiC composites increased from 18.2 GPa to 20.6 GPa when the content of SiC increased from 10 to 30 vol% and the fracture toughness of ZrC increased from 3.3 to 5.5 MPa.m(1/2) with the addition of 30 vol% SiC. Additionally, mechanical properties of ZrC-SiC composites having 30 vol% SiC increased with 0.25 wt% CNT. However, further addition of CNT resulted in lower hardness values and there was not any considerable difference in fracture toughness values for ZrC-SiC-CNT composites. The highest values of hardness and fracture toughness were 21.6 GPa and 5.8 MPa.m(1/2) which was about 75% better compared to monolithic ZrC, and achieved with the addition of 30 vol% SiC and 0.25 wt% CNT.