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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

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Journal of Advanced Ceramics 2020年第5期9卷 606-616页

作者： B.A.AHMED t.laoui A.S.HAKEEM Department of Mechanical Engineering College of Electrical and Mechanical EngineeringNational University of Sciences and TechnologyIslamabad 44000Pakistan Department of Mechanical and Nuclear Engineering University of SharjahSharjah 27272United Arab Emitates Center for Advanced Materials Research Research Institute of Sciences and EngineeringUniversity of SharjahSharjah 27272United Arab Emitates Center of Excellence in Nanotechnology King Fahd University of Petroleum and MineralsDhahran 31261Saudi Arabia

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)*** 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 *** SPS processed sialons were characterized for their microstructure,phase and compositional analysis,and physical and mechanical ***,a correlation was developed between the lattice parameters and the content(x)of the alkaline metal cation in the α-sialon ***-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

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Synthesis and spark plasma sintering of Al-Mg-Zr alloys

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Journal of Central South University 2013年第1期20卷 7-14页

作者： N.Saheb A.S.Hakeem A.Khalil N.Al-Aqeeli t.laoui Department of Mechanical Engineering/Center of Research Excellence in Nanotechnology King Fahd University of Petroleum & Minerals (KFUPM)Dhahran 31261Kingdom of Saudi Arabia

Although casting is commonly used to process aluminum alloys, powder metallurgy remains a promising technique to develop aluminum based materials for structural and functional applications. the possibility to synthesize Al-Mg-Zr alloys through mechanical alloying and spark plasma sintering techniques was explored. Al-10Mg-5Zr and Al-5Mg-1Zr alloyed powders were synthesized through wet ball milling the appropriate amount of elemental powders. the dried milled powders were spark plasma sintered through passing constant pulsed electric current with fixed pulse duration at a pressure of 35 MPa. the samples were vacuum sintered at 450, 500, 550, 600 and 620 ℃ for 10, 15 and 20 min. the Al-10Mg-5Zr alloy displays poor densification at lower sintering temperatures of 450, 500, 550 and 600 ℃. Its sinterability is improved at a temperature of 620 ℃ whereas sintering temperatures higher than 620 ℃ leads to partial melting of the alloy. It is possible to sinter the Al-5Mg-1Zr alloy at 450, 500 and 550 ℃. the increase of sintering temperature improves its densification and increases its hardness. the Al-5Mg-IZr alloy displays better densification and hardness compared to Al-10Mg-5Zr alloys.

关键词： aluminum alloys mechanical alloying spark plasma sintering powder metallurgy

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