Effects of adding yttrium nitrate on the mechanical properties of hot-pressed AlN ceramics

► Y(NO 3) 3·6H 2O was used to prepare AlN ceramics as sintering additive. ► The residual stress was discussed in sintered AlN ceramics. ► The interfacial bonding of AlN and yttrium aluminates phase was discussed. Aluminum nitride (AlN) ceramics were prepared by hot-pressing with Y(NO 3) 3·6H 2O as s...

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Bibliographic Details
Published in:Journal of alloys and compounds 2011-09, Vol.509 (35), p.8688-8691
Main Authors: Xu, F.M., Zhang, Z.J., Shi, X.L., Tan, Y., Yang, J.M.
Format: Article
Language:English
Subjects:
Additives
AlN ceramics
Aluminum nitride
Ceramics
Condensed matter: structure, mechanical and thermal properties
Deformation and plasticity (including yield, ductility, and superplasticity)
Exact sciences and technology
Fracture toughness
Hardness
Interfacial bonding
Mechanical and acoustical properties of condensed matter
Mechanical properties
Mechanical properties of solids
Physics
Strength
Tribology and hardness
Yttrium
Yttrium nitrate
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Summary:► Y(NO 3) 3·6H 2O was used to prepare AlN ceramics as sintering additive. ► The residual stress was discussed in sintered AlN ceramics. ► The interfacial bonding of AlN and yttrium aluminates phase was discussed. Aluminum nitride (AlN) ceramics were prepared by hot-pressing with Y(NO 3) 3·6H 2O as sintering additive. The mechanical properties including flexural strength, Vickers’ hardness, and fracture toughness were studied. The relative density and mechanical property of the monolithic AlN were improved by adding Y(NO 3) 3·6H 2O, which decreased the porosity. At 2 wt% Y 2O 3, the AlN ceramic exhibited the highest strength of 383 MPa, the highest hardness of 15.39 GPa, and the highest fracture toughness of 3.1 MPa m 1/2. However, doping with more additive, the strength, hardness, and toughness of AlN ceramics decreased because of the weak interfacial bonding between AlN matrix and the yttrium aluminates phase.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2011.05.110