烧结
微观结构
放电等离子烧结
无定形固体
材料科学
粒径
陶瓷
维氏硬度试验
扫描电子显微镜
差热分析
共晶体系
热压
粒度
矿物学
冶金
化学工程
复合材料
化学
衍射
结晶学
光学
物理
工程类
作者
Anna Prnová,Jana Valúchová,Monika Michálková,Beáta Pecušová,Milan Parchovianský,Peter Švančárek,Ondrej Hanzel,Václav Pouchlý,Dušan Galusek
标识
DOI:10.1515/pac-2021-0705
摘要
Abstract Glass microspheres with yttria-alumina eutectic composition (76.8 mol% Al 2 O 3 and 23.2 mol% Y 2 O 3 ) were prepared by sol-gel Pechini method and flame synthesis with or without subsequent milling. Prepared amorphous powders were studied by X-ray powder diffraction (XRD), particle size analysis (PSA), scanning electron microscopy (SEM) and differential thermal analysis (DTA). Hot pressing (HP), rapid hot pressing (RHP) and spark plasma sintering (SPS) were used to sinter amorphous precursor powders at 1600 °C without holding time (0 min). The preparation process including milling step resulted in amorphous powders with narrower particle size distribution and smaller particle size. All applied pressure assisted sintering techniques resulted in dense bulk samples with fine grained microstructure consisting of irregular α-Al 2 O 3 and Y 3 Al 5 O 12 (YAG) grains. Milling was beneficial in terms of final microstructure refinement and mechanical properties of sintered materials. A material with the Vickers hardness of HV = (17.1 ± 0.3) GPa and indentation fracture resistance of (4.2 ± 0.2) MPa.m 1/2 was prepared from the powder milled for 12 h.
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