Development of calcium stabilized nitrogen rich α-sialon ceramics along the Si3N4:1/2Ca3N2:3AlN line using spark plasma sintering

Journal of Advanced Ceramics

A. S. Hakeem¹  B. A. Ahmed²  T. Laoui³ 

[1] Center of Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals, 31261, Dhahran, Saudi Arabia;Department of Mechanical Engineering, College of Electrical and Mechanical Engineering, National University of Sciences and Technology, 44000, Islamabad, Pakistan;Department of Mechanical and Nuclear Engineering, University of Sharjah, 27272, Sharjah, United Arab Emirates;Center for Advanced Materials Research, Research Institute of Sciences and Engineering, University of Sharjah, 27272, Sharjah, United Arab Emirates;

关键词: nitrogen rich sialon ceramics;    α-sialon;    calcium sialons;    spark plasma sintering (SPS);    liquid phase sintering;   

DOI  :  10.1007/s40145-020-0400-y

来源: Springer

【 摘 要 】

Calcium stabilized nitrogen rich sialon ceramics having a general formula of CaxSi12-2xAl2xN16 with x value (x is the solubility of cation Ca in α-sialon structure) in the range of 0.2–2.2 for compositions lying along the Si3N4:1/2Ca3N2:3AlN line were synthesized using nano/submicron size starting powder precursors and spark plasma sintering (SPS) technique. The development of calcium stabilized nitrogen rich sialon ceramics at a significantly low sintering temperature of 1500 °C (typically reported a temperature of 1700 °C or greater) remains to be the highlight of the present study. The SPS processed sialons were characterized for their microstructure, phase and compositional analysis, and physical and mechanical properties. Furthermore, a correlation was developed between the lattice parameters and the content (x) of the alkaline metal cation in the α-sialon phase. Well-densified single-phase nitrogen rich α-sialon ceramics were achieved in the range of 0.53(3) ⩽ x ⩽ 1.27(3). A nitrogen rich α-sialon sample possessing a maximum hardness of 22.4 GPa and fracture toughness of 6.1 MPa·m1/2 was developed.

【 授权许可】

CC BY