Abstract
The aim of the study was to increase the toughness and strength of the Cr3C2 based cermets without compromising other mechanical properties by reinforcing Cr3C2-NiCr with yttria stabilized tetragonal zirconia particles (3Y-TZP). The TZPs were produced by a steric entrapment process. Cr3C2-NiCr (master) and 2wt% 3Y-TZP reinforced Cr3C2-NiCr "73C2Z3" cermets were sintered and the sintering kinetics and resulting mechanical properties were determined. The master cermets were sintered to 97% of theoretical density at 1350°C while 73C2Z3 cermets achieved a relative density of 98.5% even at 1300°C. Elastic modulus, transverse rapture strength, hardness, and fracture toughness values were measured. For the master cermets, all mechanical properties showed an increasing trend by increasing the sintering temperature to 1350°C. On the other hand, the mechanical properties of 73C2Z3 cermets reached maximum or near maximum values at 1300°C. Moreover, 73C2Z3 cermets had higher strength and fracture toughness compared to that of the master cermets and this observation was attributed to smaller carbide grains, a homogeneous 3-D network structure of Ni-Cr metal binder phase and a good distribution of fine 3Y-TZPs.
Original language | English (US) |
---|---|
Pages (from-to) | 878-884 |
Number of pages | 7 |
Journal | Materials Science and Engineering: A |
Volume | 556 |
DOIs | |
State | Published - Oct 30 2012 |
Keywords
- 3Y-TZP
- Carbides
- Cermet
- Fracture
- SEM
- Sintering
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering