Mechanical properties of toughened Al2O3–ZrO2–TiN ceramics

Novel Fabrication Route to Al2O3–TiN Nanocomposites Via Spark Plasma Sintering

“…T itanium nitride (TiN) has a particularly desirable combination of mechanical, thermal, and electrical properties, such as a high melting temperature (3200 K), a high microhardness (21 GPa), a high chemical stability, a relatively low density (5.4 g/cm 3 ), and a low electrical resistivity (3.34 × 10 −7 Ω·cm) 1 . Thus, TiN has been attracting increasing interest as a constituent of composites for a wide range of applications, such as cutting tools, tool coating, solar‐control films, and microelectronics 2 .…”

ZrO2–Al2O3 composites with tailored toughness

“…Due to the insolubility of alumina and zirconia over a wide temperature range of room temperature and typical sintering temperature, ZrO 2 -Al 2 O 3 composites have the potential to combine an increased hardness with the excellent toughness of tetragonal zirconia. Although a large amount of research papers have been published on the Al 2 O 3 -ZrO 2 system, literature reports, till todate, mainly concern the development of ZrO 2 toughened Al 2 O 3 (ZTA) materials with typical ZrO 2 contents of 10-40 vol.% [6][7][8][9]. ZTA materials have received increased attention as implant materials, structural materials, and cutting tools in metalworking and paper cutting.…”

“…The authors noted a maximum bending strength of about 3 GPa at Al 2 O 3 levels between 20 and 30 vol.%. Ostrovoy et al measured an indentation toughness of 5 MPa m 1/2 in hot pressed Al 2 O 3 composites with 30 wt.% of 3Y-TZP [9].…”

Electroconductive Al2O3–NbN Composites

“…Among these dispersoids, TiN is the most promising candidate due to its attractive mixture of physical and chemical properties. Electroconductive ceramic systems such as Al 2 O 3 –TiN, Si 3 N 4 –TiN, ZTM–TiN, Al 2 O 3 –ZrO 2 –TiN, ZrO 2 –TiN, Sialon–TiN, and MgAl 2 O 4 –TiN have been widely studied 13–19 …”

“…Electroconductive ceramic systems such as Al 2 O 3 -TiN, Si 3 N 4 -TiN, ZTM-TiN, Al 2 O 3 -ZrO 2 -TiN, ZrO 2 -TiN, Sialon-TiN, and MgAl 2 O 4 -TiN have been widely studied. [13][14][15][16][17][18][19] Just like TiN, niobium nitride (NbN) shows many superior chemical and physical properties such as a high melting point, chemical inertness, superior hardness, and high electrical conductivity. 20 It is reasonable to assume that incorporating NbN into ceramic matrices will greatly increase the performance of composites as well as the range of applications for NbN.…”