Influence of the Fine Fraction and Sintering on Selected Isotropic and Anisotropic Bulk Properties of Uniaxial Compacts

Influence of the Fine Fraction and Sintering on Selected Isotropic and Anisotropic Bulk Properties of Uniaxial Compacts
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细粒级分和烧结对单轴压坯选定的各向同性和各向异性块体性能的影响

DOI:
10.1007/s42411-022-0482-3
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发表时间:
--
期刊:
Interceram - International Ceramic Review
影响因子:
--
通讯作者:
H. Harmuth
H. Harmuth
中科院分区:
--
文献类型:
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作者:
J. Fruhstorfer;M. Wagner;D. Gruber;H. Harmuth

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研究了细颗粒含量和最小粒径对水泥基复合材料的密度、收缩率、弹性模量E以及收缩率和弹性模量各向异性的影响。较低的最小颗粒尺寸和较高的细粉含量改善了颗粒的堆积、润滑和烧结致密化,导致较高的密度和E。据推测,由于压制后的较低密度中性区,各向异性收缩率在压制方向上较高,从而改善了密度均匀性。对于杨氏模量,各向异性的程度主要随着较高的烧结能力(高细粉含量)而增加。特别是作为中性区的核心,E值更低。示例性的密度和开孔孔隙度分布揭示了在芯中形成的缺陷,这导致较低的E。单轴压制期间的压力分布导致密度分布,并且最终导致烧结后的缺陷密度或缺陷尺寸分布。
This study focuses on the influences of the fine particle fraction and the minimum particle size on the density, the shrinkage, the Young's modulus E, and the anisotropies of shrinkage and E. A lower minimum particle size and a higher fines content improved the particle packing, lubrication and sintering densification resulting in higher densities and E. Presumably due to a lower-density neutral zone after pressing, the anisotropic shrinkage was higher in the pressing direction, improving the density homogeneity. For the Young's modulus, the extent of the anisotropy increased mainly with a higher sintering capability (high fines content). Especially the core as a part of the neutral zone had a lower E. Exemplary density and open porosity distributions revealed that flaws formed in the core, which led to the lower E. The pressure distribution during uniaxial pressing leads to a density distribution and, finally, to a flaw density or flaw size distribution after sintering.
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