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Ceramics, Volume 2, Issue 3

September 2019 - 9 articles

Cover Story: Sodium is known to diffuse down through the cathode lining in Hall–Héroult cells, possibly reaching the thermal insulation in the bottom of the lining. In this work, the reaction between sodium and three commercial thermal insulation materials was investigated for the first time via a laboratory test combined with thermodynamic considerations of possible mineralogical transformations due to reaction with Na. The results revealed clear differences between the materials with respect to chemical and structural stability. View this paper
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Articles (9)

  • Article
  • Open Access
1 Citations
3,090 Views
15 Pages

Morphology and Characterisation of Novolac–LDPE-Based Mixtures as Matrix for Injection Moulded Green Bodies for Bio-Based SiC Ceramics

  • Matthias Mihalic,
  • Fernanda Soares de Sousa,
  • Ivana Burzic,
  • Andreas Hinterreiter,
  • David Stifter and
  • Christian Fürst

9 September 2019

This work focuses on the influence of the composition of novolac–LDPE-based mixtures, which serve as a matrix for the green bodies for bio-based silicon carbide (C/Si/SiC) ceramics, on the morphology and the mechanical properties of the green b...

  • Article
  • Open Access
8 Citations
3,977 Views
11 Pages

Usability of Cr-Doped Alumina in Dosimetry

  • Ernests Einbergs,
  • Aleksejs Zolotarjovs,
  • Ivita Bite,
  • Katrina Laganovska,
  • Krisjanis Auzins,
  • Krisjanis Smits and
  • Laima Trinkler

2 September 2019

Dosimetry is a widespread material science field dealing with detection and quantification of ionizing radiation using electronic processes in materials. One of the main aspects that determines the performance of dosimeters is the type of defects the...

  • Article
  • Open Access
1 Citations
3,999 Views
11 Pages

19 August 2019

Yttria coatings for all-oxide combustor walls were tested for their crack-growth behavior. These environmental and thermal barrier Y2O3-coatings were processed by atmospheric plasma spraying (APS). The stiffness and strength were measured for as-rece...

  • Article
  • Open Access
3 Citations
3,868 Views
12 Pages

Enhancement of the Ionic Conductivity in Electric Field-Assisted Pressureless Sintered BITIVOX Solid Electrolytes

  • Midilane S. Medina,
  • Sabrina G. M. Carvalho,
  • Eliana N. S. Muccillo and
  • Reginaldo Muccillo

11 August 2019

Bi4V1.8Ti0.2O11 (BITIVOX) ceramic pellets, prepared with powders obtained by a sol gel technique, were sintered either conventionally at 800 °C/8 h or by applying an AC electric voltage, limiting the electric current through the pellets. Electric...

  • Article
  • Open Access
3 Citations
4,100 Views
14 Pages

1 August 2019

Dynamic separation and direct edge loading of hip replacement bearings can be caused by many factors, including implant positioning, implant design, changes in device over time, surgical variations and patient variations. Such dynamic separation and...

  • Article
  • Open Access
8 Citations
5,850 Views
16 Pages

Towards In-Situ Electron Microscopy Studies of Flash Sintering

  • Danny Schwarzbach,
  • Jesus Gonzalez-Julian,
  • Olivier Guillon,
  • Vladimir Roddatis and
  • Cynthia A. Volkert

25 July 2019

Flash sintering, a special case of electric field-assisted sintering, results in accelerated densification at lower temperatures than conventional sintering methods. However, the mechanisms remain elusive despite the wide application potential. In-si...

  • Article
  • Open Access
12 Citations
4,298 Views
12 Pages

17 July 2019

K0.5Na0.5NbO3-based ceramics, a promising group of lead-free piezoelectrics, are challenging to sinter dense while avoiding alkali evaporation. This work explores hybrid atmosphere processing, a new approach where reducing atmospheres is used during...

  • Article
  • Open Access
9 Citations
4,508 Views
19 Pages

Chemical Durability of Thermal Insulating Materials in Hall-Héroult Electrolysis Cells

  • Raymond Luneng,
  • Søren N. Bertel,
  • Jørgen Mikkelsen,
  • Arne Petter Ratvik and
  • Tor Grande

8 July 2019

The most common thermal insulating materials used in the cathode lining in aluminum electrolysis cells are Moler (diatomaceous earth), calcium silicate, or vermiculite based materials. The thermal insulation layer is critical for the overall thermal...

  • Article
  • Open Access
12 Citations
4,059 Views
15 Pages

1 July 2019

SiC-based fibers are sensitive to delayed failure under constant load at high temperatures in air. Static fatigue at intermediate temperatures < 800 °C was attributed to slow crack growth from flaws located at the surface of fibers, driven by...

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Ceramics - ISSN 2571-6131