Development of calcium stabilized nitrogen rich α-sialon ceramics along the Si_(3)N_(4):1/2Ca_(3)N_(2):3AlN line using spark plasma sintering  

作　　者：B.A.AHMED T.LAOUI A.S.HAKEEM 

机构地区：[1]Department of Mechanical Engineering,College of Electrical and Mechanical Engineering,National University of Sciences and Technology,Islamabad 44000,Pakistan [2]Department of Mechanical and Nuclear Engineering,University of Sharjah,Sharjah 27272,United Arab Emitates [3]Center for Advanced Materials Research,Research Institute of Sciences and Engineering,University of Sharjah,Sharjah 27272,United Arab Emitates [4]Center of Excellence in Nanotechnology,King Fahd University of Petroleum and Minerals,Dhahran 31261,Saudi Arabia

出　　处：《Journal of Advanced Ceramics》2020年第5期606-616,共11页先进陶瓷（英文）

基　　金：the support provided by both King Fahd University of Petroleum and Minerals,Saudi Arabia,and the University of Sharjah,United Arab Emirates

摘　　要：Calcium stabilized nitrogen rich sialon ceramics having a general formula of Ca_(x)Si_(12-2x)Al_(2x)N_(16) 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 Si_(3)N_(4):1/2Ca_(3)N_(2):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℃(typically reported a temperature of 1700℃ 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 richα-sialon sample possessing a maximum hardness of 22.4 GPa and fracture toughness of 6.1 MPa·m^(1/2) was developed.

关 键 词：nitrogen rich sialon ceramics Α-SIALON calcium sialons spark plasma sintering(SPS) liquid phase sintering 

分 类 号：TQ174.7[化学工程—陶瓷工业]