Optical Materials Express · 2014 · 19 citations · 16 references
Natural SciencesMaterials EngineeringMaterials ScienceCeramic MaterialsCeramicsMaterials ChemistryCeramic MorphologyCeramic TechnologyMicrostructure AnalysisMicrostructure ControlPorous CeramicsSinteringCeramic CharacterizationCeramic LasersGrain BoundariesHot Isostatic PressingIsostatic PressingPoresSinter ProcessingSintering Behavior
This paper demonstrates that we can further eliminate the remaining micro pores by hot isostatic press (HIP) approach. The porosity of Nd:LuAG laser ceramics sharply declined from 7 x 10(-6) to 5.60 x 10(-7) after additional HIP. Annealing is one of the key steps to optimize the quality of vacuum sintered ceramics, such as make the transmittance rise from 79.98% to 81.02% at 1200nm. However, the trend is in the opposite direction for the HIPed Nd:LuAG:fallen from 82.65% to 25.50% at 1200nm. The microstructure of Nd:LuAG studied by microscope, SEM and TEM shows that a large number of pores and a few second phases like Lu2SiO5 appeared along grain boundaries in post-annealed HIPed Nd:LuAG. The gas composition was confirmed as argon by GCMS analysis. By further optimizing the annealing process of HIPed ceramics we found that vacuum annealed at 1600 degrees C for 10h and oxygen re-annealed at 1200 degrees C for 30h can reduce pores and make the ceramic quality better, the transmittance can reach 83.05% at 1200nm, and the porosity dropped to 3.2 x 10(-7). (C) 2014 Optical Society of America
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Transparent ceramics: Processing, materials and applications
S. F. Wang, J. Zhang, D.W. Luo et al. · Progress in Solid State Chemistry · 2012 · 639 citations
Natural Sciences, Materials Engineering, Materials Science +12