Metal particles size influence on graded structure in composite Al
Justyna Zygmuntowicz , Aleksandra Miazga , Katarzyna Konopka , Waldemar Kaszuwara
The aim of this study was to investigate the effect of the nickel particle size on the changes in metallic phase content in the graded structure in the Al2O3-Ni composites. Centrifugal slip casting was chosen as the method of composite fabrication. This method allows the creation of a graded distribution of Ni particles in the hollow cylinder composite sample. Functional graded materials were prepared in the vertical rotation axis. In the experiments the following powders were used: α-Al2O3 TM-DAR from Taimei Chemicals (Japan) of an average particle size 0.133 μm and density 3.96 g/cm3 and Ni powders from Sigma-Aldrich of average particle sizes 3 μm and 8.5 μm. Aqueous slurries containing alumina (50 % of volume fractions of solid phase volume content) and nickel powders (10 % of volume fractions) were tested. Deflocculates diammonium citrate (p.a., Aldrich) and citric acid (p.a., POCH Gliwice) were also added. Final sintering was conducted on all the specimens at 1400 °C in a reducing atmosphere (N2/H2). The obtained samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, quantitative analyses of the Ni particles distribution were made. In the fabricated samples the graded structure were characterized by zones with different Ni particles concentration. The size of the Ni particles influences the width of these zones. Vickers indentation was used to determine the hardness of the materials.
|Journal series||Materiali in Tehnologije, ISSN 1580-2949|
|Score|| = 15.0, 27-02-2020, ArticleFromJournal|
= 15.0, 27-02-2020, ArticleFromJournal
|Publication indicators||= 7; : 2016 = 0.661; : 2016 = 0.436 (2) - 2016=0.483 (5)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.