Microstructure and Mechanical Properties of AlN Ceramics Sintered with Yttrium Nitrate

Zhi Jun Zhang; Fu Min Xu; Yi Tan; Xiao Lei Shi; Wei Dong

doi:10.4028/www.scientific.net/MSF.675-677.159

Paper Titles

Effects of Rare-Earth Oxides Doping on Microstructures and Properties of Al₂O₃/TiAl Composites
p.143

First Principle Study on Ti₄AlN₃ Properties under Pressure Effect
p.147

Mechanical Properties and Microstructure of KD-1 SiC_f/SiC Composites Fabricated by Vapor Silicon Infiltration
p.151

Effects of LiF on Sintering Temperature and Microwave Dielectric Properties of (Ca_0.3La_0.4/3)(Li_0.25Nd_0.25)TiO₃ Ceramics Doped by ZnO-B₂O₃- SiO₂ Glass
p.155

Microstructure and Mechanical Properties of AlN Ceramics Sintered with Yttrium Nitrate
p.159

Preparation of High Wear-Resistant Ceramic Parts
p.163

Surface Treatment of Cubic Boron Nitride Grains Applied to Vitrified Bond Grinding Tools
p.167

Influence of La₂O₃ on the Electrical Properties of Dense SnO₂ Electrodes
p.171

Effects of Carbon Source on Fabrication and Characterization of Porous Silicon Nitride Ceramics by Carbothermal Reduction
p.175

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Microstructure and Mechanical Properties of AlN Ceramics Sintered with Yttrium Nitrate

Abstract:

AlN ceramics were prepared by hot-pressing process with Y(NO3)3·6H2O as a sintering additive. Microstructure and mechanical properties of sintered AlN ceramics were measured and compared with that of monolithic AlN ceramic prepared by the same process. The results showed that the density and mechanical properties of monolithic AlN ceramics were drastically enhanced by adding Y(NO3)3·6H2O. Especially, the AlN ceramic with 3.24 wt% Y(NO3)3·6H2O (2 wt% Y2O3) displayed striking enhancement in mechanical propertie. However, such enhancement did not follow a consistent behavior with the increase of Y(NO3)3·6H2O content. A significant drop present at contents over inflection point (3.24 wt% Y(NO3)3·6H2O).