| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1604018 | International Journal of Refractory Metals and Hard Materials | 2011 | 6 Pages |
The sinterability of ZrC was enhanced by high-energy ball milling as well as introduction of graphite and SiC as sintering additives. Densification process and microstructure development were investigated for ZrC-based ceramics densified by pressureless sintering. As-received ZrC powder showed poor sinterability. After high-energy ball milling, ZrC powder can be sintered to 98.4% theoretical density at 2100 °C. The obtained ceramic had fine microstructure and fewer entrapped pores. Introduction of 2 wt.% graphite combined with high-energy ball milling lowered the densification temperature of ZrC. The relative density of obtained ceramic reached up to 95% at 1900 °C. Introduced SiC inhibited ZrC grain growth during sintering and consequently avoided the entrapped pores within the grains. The relative density of ZrC–SiC reached up to 96.7% at 2100 °C. ZrC–SiC composite formed an interesting intragranular structure and had high fracture strength at room temperature.
Research Highlights► High-energy ball milled ZrC was pressurelessly sintered to 98.4% theoretical density at 2100°C. ► High-energy ball milled ZrC was pressurelessly sintered to 95% theoretical density at 1900°C using 2wt% graphite as sintering aid. ► High-energy ball milled ZrC + 20vol.%SiC was pressurelessly sintered to 96.7% theoretical density at 2100°C. ► The obtained ZrC + 20vol.%SiC ceramic formed an intragranular microstructure and had excellent mechanical properties.
