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Effects of AlN on the densification and mechanical properties of pressureless-sintered sic ceramics

Progress in Natural Science:Materials International 2016年第1期26卷 90-96页

作者： Qisong Li Yujun Zhang Hongyu Gong Haibin Sun Yanxia Zhai Weiya Zhu Jie Jing Key Laboratory for Liquid–solid Structural Evolution & Processing of Materials of Ministry of Education Shandong University Key Laboratory of Special Functional Aggregated Materials Ministry of Education Shandong University School of Materials and Chemical Engineering Zhongyuan University of Technology Shandong Baona New Materials Co. Ltd.

In the present work, Si C ceramics was fabricated with Al N using B;C and C as sintering aids by a solid-state pressureless-sintered method. The effects of Al N contents on the densification, mechanical properties, phase compositions, and microstructure evolutions of as-obtained Si C ceramics were thoroughly investigated. Al N was found to promote further densification of the Si C ceramics due to its evaporation over 1800 °C,transportation, and solidification in the pores resulted from Si C grain coarsening. The highest relative density of 99.65% was achieved for Si C sample with 15.0 wt% Al N by the pressureless-sintered method at 2130 °C for 1 h in Ar atmosphere. Furthermore, the fracture mechanism for Si C ceramics containing Al N tended to transfer from single transgranular fracture mode to both transgranular fracture and intergranular fracture modes when the sample with 30.0 wt% Al N sintered at 1900 °C for 1 h in Ar. Also, Si C ceramics with 30.0 wt% Al N exhibited the highest fracture toughness of 5.23 MPa m;when sintered at 1900 °C.

关键词： sic ceramics AlN Densification Pressure-less sintering

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Transition-layer of coreerim structures andβ→a transformation in sic ceramics

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Journal of Materiomics 2023年第2期9卷 299-309页

作者： Qing-Qing Shao Hui Gu Materials Genome Institute School of Materials Science and EngineeringShanghai UniversityShanghai200444China

Similar to Si_(3)N_(4)ceramics,β→a phase transformation in sic ceramics plays a key role in tailoring the microstructures thus optimizing related *** microstructures are dominated with the core erim structures by AlN-solution,and by EBSD analysis,a-lamellae were revealed as stacking-faults(SF)and twin-boundaries(TB)in b-grains,co-existing with the coreerim structures asα/β→α’/β’transformation by *** structural transformation can proceed much further by gas-pressuresintering than hot-pressing with only RE2O3 agents,while the latter retain a high-density of SF/TB in the metastable b-sic *** high-angle secondary-electron imaging,nanoscale transition-layer(TL)was observed as an inter-phase to fully separate the core and rim,which is created by a transitory equilibrium in the solutionereprecipitation *** enrichment of AlN or RE in TL demonstrates their segregation to core surface until reaching the super-saturation and before the growth of *** higher AlN or RE solution and after sintering,a shear stress can develop from TL contour to drive the expansion of SF/TB in Martensitic transition,especially under an external isotropic *** combinations ofβ→a transformation,coreerim structures and viscous liquid-phase enable the comprehensive assessment of sintering-microstructure-property-performance relationship of sic ceramics,as demonstrated for their creep behaviors and fracture toughness.

关键词： sic ceramics Coreerim structures Transition-layer Martensitic transition Creep behaviors

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High strength mullite-bond sic porous ceramics fabricated by digital light processing

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Journal of Advanced ceramics 2024年第1期13卷 53-62页

作者： Jian Sun Jingde Zhang Xu Zhang Zihe Li Jianzhang Li Sijie Wei Weibin Zhang Weili Wang Guifang Han Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China Key Laboratory of Special Functional Aggregated Materials Ministry of EducationShandong UniversityJinan 250100China Materials and Structures Research Centre Department of Mechanical EngineeringUniversity of BathBath BA27AYUK National Engineering Research Centre of Ceramic Matrix Composite Manufacture Technology Xi’an Golden Mountain Ceramic Composites Co.Ltd.Xi’an 710118China School of Physics and Materials Science Changji UniversityChangji 831100China

Fabricating sic ceramics via the digital light processing(DLP)technology is of great challenge due to strong light absorption and high refractive index of deep-colored sic powders,which highly differ from those of resin,and thus significantly affect the curing performance of the photosensitive sic *** this paper,a thin silicon oxide(SiO_(2))layer was in-situ formed on the surface of sic powders by pre-oxidation *** method was proven to effectively improve the curing ability of sic *** sic photosensitive slurry was fabricated with solid content of 55 vol%and viscosity of 7.77 Pa·s(shear rate of 30 s^(−1)).The curing thickness was 50μm with exposure time of only 5 ***,a well-designed sintering additive was added to completely convert low-strength SiO_(2) into mullite reinforcement during *** mullite-bond sic ceramics were successfully *** flexural strength of sic ceramics sintered at 1550℃in air reached 97.6 MPa with porosity of 39.2 vol%,as high as those prepared by spark plasma sintering(SPS)techniques.

关键词： digital light processing(DLP) sic ceramics pre-oxidation mullite-bond sic mechanical properties

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