Fabrication and Properties Analysis of the Thin Walled β''-Alumina Tube

2014 ◽  
Vol 1643 ◽  
Author(s):  
Shimeng Zeng ◽  
Hwan Kim ◽  
Jin-Soo Ahn ◽  
Young-Min Park ◽  
Nigel Mark Sammes
Keyword(s):  
Slip Casting ◽  
Dip Coating ◽  
Alumina Powder ◽  
Dense Layer ◽  
Porous Substrate ◽  
Sintering Process ◽  
Casting Method ◽  
Porous Tube ◽  
Ring Method ◽  
Reaction Processing

ABSTRACTDense thin β/β’’-alumina electrolyte films of less than 50 μm thickness were fabricated using vacuum dip-coating on porous substrate tubes. The porous substrate tubes were fabricated using a slip casting method. Fine Na-β/β’’-alumina powder was obtained via traditional solid state reaction processing. It was found that vacuum dip-coating is an effective method for fabricating thin dense layers coated on the porous tube. The mechanical properties of the porous tube, with and without the dense layer, were tested using a C-ring method. The optimized sintering process was also studied.

scholarly journals Investigation of microstructure and selected properties of Al2O3-Cu and Al2O3-Cu-Mo composites

2020 ◽  
Author(s):  
Justyna Zygmuntowicz ◽  
Joanna Łoś ◽  
Bernard Kurowski ◽  
Paulina Piotrkiewicz ◽  
Waldemar Kaszuwara
Keyword(s):  
Slip Casting ◽  
Sintering Process ◽  
Casting Method ◽  
Metal Composites ◽  
Rheological Study ◽  
X Ray ◽  
Wear Rates ◽  
Flow Limit ◽  
Molybdenum Addition ◽  
The Mean

AbstractThe scope of work included the fabrication of ceramic-metal composites from the Al2O3-Cu and Al2O3-Cu-Mo and examining their microstructure and selected properties. The composites were fabricated by the slip casting method. The rheological behavior, microstructures, X-ray analysis, and mechanical properties were investigated. The rheological study demonstrated that all of the obtained slurries were non-Newtonian shear diluted fluids and stability on time. In both slurries, the flow limit is close to 0 Pa, which is very beneficial when casting the suspensions into molds. The X-ray analysis reveals Al2O3, Cu, and Mo phases in all specimens. No new phases were found in both types of composites after the sintering process. The results provided that the hardness for Al2O3-Cu-Mo composites was equal to 10.06 ± 0.49 GPa, while for Al2O3-Cu, it was equal to 6.81 ± 2.08 GPa. The K1C values measured, with the use of Niihara equation, for composites with and without the addition of Mo were equal to 6.13 ± 0.62 MPa m0.5 and 6.04 ± 0.55 MPa m0.5, respectively. It has been established that the mean specific wear rates of Al2O3-Cu and Al2O3-Cu-Mo samples were 0.35 × 10–5 ± 0.02 mm3 N−1 m−1 and 0.22 × 10–5 ± 0.04 mm3 N−1 m−1, respectively. It was found that molybdenum addition improved wear resistance properties of the composites.

scholarly journals Investigation on microstructure and selected properties of aluminum oxide–copper–nickel ceramic–metal composites

2021 ◽  
Author(s):  
J. Zygmuntowicz ◽  
J. Kosiorek ◽  
P. Piotrkiewiecz ◽  
B. Zacharko ◽  
M. Wachowski ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Reference Material ◽  
Slip Casting ◽  
Metallic Phase ◽  
Homogeneous Distribution ◽  
Sintering Process ◽  
Casting Method ◽  
Metal Composites ◽  
Microstructure Characteristics ◽  
Nickel Powders

AbstractA new ternary system of ceramic–metal composites has been fabricated from alumina, copper, and nickel powders by the slip casting method. The research aimed to avoid copper leaking during the sintering process of the formation while processing the CuNi phase. Five different compositions were examined, differing in the ratio of nickel to copper. Stable slurries with good casting properties were prepared for all compositions. The final composites after the sintering process were characterized by a homogeneous distribution of the metallic phase, but they differed in the microstructure characteristics. The addition of nickel limits the outflow of the liquid phase (copper) during sintering but does not eliminate it. This resulted in a reduction in the hardness of the samples compared to the reference material.

scholarly journals Microstructure Characterization of Composite from ZrO2 – Ti System

2017 ◽  
Vol 62 (4) ◽  
pp. 2045-2049 ◽  
Author(s):  
P. Łada ◽  
A. Miazga ◽  
P. Bazarnik ◽  
K. Konopka
Keyword(s):  
Quantitative Analysis ◽  
Dwell Time ◽  
Titanium Powder ◽  
Slip Casting ◽  
Inert Atmosphere ◽  
Sintering Process ◽  
Titanium Particle ◽  
Casting Method ◽  
Composite Samples

AbstractIn this work the microstructure analysis of composite from ZrO2– Ti system were presented. For the preparation of the composite samples nanometric ZrO2powder stabilized by 3 mol% of Y2O3and micrometric titanium powder were used. The composites with 10 vol.% addition of titanium particles were prepared by slip casting method. The sintering process was conducted at 1450°C with 2 hours’ dwell time, in the inert atmosphere of argon. The microstructure observations were carried out with the use of SEM and STEM microscopes. The quantitative analysis and stereological characterization were performed. The SEM and STEM observations allowed characterizing the microstructure of composite samples. Especially, the interface between titanium particles and zirconia matrix was described. The growth of the zirconia grains around the Ti rich areas was observed. The increase of the zirconia grains size results from the reaction on the interface between titanium particle and zirconia matrix during the sintering process.

scholarly journals Zirconia–Alumina Composites Obtained by Centrifugal Slip Casting as Attractive Sustainable Material for Application in Construction

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 250
Author(s):  
Justyna Zygmuntowicz ◽  
Justyna Tomaszewska ◽  
Radosław Żurowski ◽  
Marcin Wachowski ◽  
Paulina Piotrkiewicz ◽  
...  
Keyword(s):  
Slip Casting ◽  
Sintering Process ◽  
Alumina Matrix ◽  
X Ray Diffraction ◽  
Casting Method ◽  
Zro2 Content ◽  
Stereological Analysis ◽  
Alumina Composite ◽  
Alumina Composites ◽  
Sintered Materials

This paper focuses on the possibility of adapting the centrifugal slip casting method to obtain zirconia–alumina composite materials in the form of finished tube-shaped products. These types of products, due to their unique properties, can be utilised, for example, in the transport of aggressive substances, even in extreme temperatures or corrosive conditions. The study reports on the two series of zirconia–alumina composites differing in the content of ZrO2—2.5 and 25 vol%. The fabricated and sintered materials were characterised using scanning electron microscopy (SEM), X-ray diffraction (XRD) and stereological analysis. Moreover, a life cycle assessment (LCA) was provided in accordance with the requirements of the ISO 14044 and EN 15805 standards. The obtained data clearly show that the centrifugal slip casting method allows obtaining samples with high density and extremely uniform distribution of the ZrO2 phase in the alumina matrix. The stereological analysis results proved also that the addition of ZrO2 is effective in reducing the growth of Al2O3 grains during the sintering process. The phase analysis carried out by means of XRD showed that during the sintering process, in the case of composites with a lower ZrO2 content (2.5 vol%), the monoclinic to tetragonal transformation of ZrO2 was total, while for samples containing 25 vol% ZrO2, the monoclinic phase remained in a small amount in the final product.

Fabrication of Al2O3-ZrO2~Ni Functionally Graded Pipes

2005 ◽  
Vol 492-493 ◽  
pp. 69-76
Author(s):  
H. Kobayashi
Keyword(s):  
Slip Casting ◽  
Functionally Graded ◽  
Bonding Interface ◽  
Pressureless Sintering ◽  
Sintering Process ◽  
Casting Method ◽  
Slurry Coating ◽  
Epma Analysis

The fabrication of Al2O3-ZrO2~Ni functionally graded pipes has been investigated by slurry coating and pressureless sintering process. Each slurry of Al2O3-ZrO2~Ni mixture and Ni was coated in order on the Al2O3-ZrO2 pipes formed by slip casting method with those slurries. The obtained laminar green pipes were 30 mm in diameter and approximately 90 mm in length. The laminar green pipes were sintered for 2 hours at 1430°C in a vacuum. The structure of pipes fabricated by this method was optically and microscopically examined and the graded distribution was examined by an EPMA analysis of Al and Ni. The pipes with 2 layers of Al2O3-ZrO2 and Ni had crevices in the bonding interface. Some functionally graded pipes with 3 layers were free from cracks and warps without porosity, and each interface had the complete bonding.

scholarly journals Fabrication of Polydimethysiloxane (PDMS) Dense Layer on Polyetherimide (PEI) Hollow Fiber Support for the Efficient CO2/N2 Separation Membranes

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 756
Author(s):  
Guoqiang Li ◽  
Katarzyna Knozowska ◽  
Joanna Kujawa ◽  
Andrius Tonkonogovas ◽  
Arūnas Stankevičius ◽  
...  
Keyword(s):  
Gas Separation ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Dip Coating ◽  
Separation Performance ◽  
Dense Layer ◽  
Pdms Layer ◽  
Coating Method ◽  
Coating Time ◽  
Dip Coating Method

The development of thin layer on hollow-fiber substrate has drawn great attention in the gas-separation process. In this work, polydimethysiloxane (PDMS)/polyetherimide (PEI) hollow-fiber membranes were prepared by using the dip-coating method. The prepared membranes were characterized by Scanning Electron Microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), and gas permeance measurements. The concentration of PDMS solution and coating time revealed an important influence on the gas permeance and the thickness of the PDMS layer. It was confirmed from the SEM and EDX results that the PDMS layer’s thickness and the atomic content of silicon in the selective layer increased with the growth in coating time and the concentration of PDMS solution. The composite hollow-fiber membrane prepared from 15 wt% PDMS solution at 10 min coating time showed the best gas-separation performance with CO2 permeance of 51 GPU and CO2/N2 ideal selectivity of 21.

scholarly journals Effect of Palm Stearin binder to the Mechanical Properties of Alumina using Slip Casting Method

2020 ◽  
Vol 834 ◽  
pp. 012059
Author(s):  
M N Halmy ◽  
S K Alias ◽  
M A Mat Shah ◽  
M K Maryam ◽  
M A Abu Bakar ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Slip Casting ◽  
Palm Stearin ◽  
Casting Method

Effect of Sintering Temperature on the Mechanical Properties of Nanostructured Ceria-Zirconia Prepared by Colloidal Process

2015 ◽  
Vol 1125 ◽  
pp. 401-405
Author(s):  
Mohamed M. Aboras ◽  
Andanastuti Muchtar ◽  
Noor Faeizah Amat ◽  
Che Husna Azhari ◽  
Norziha Yahaya
Keyword(s):  
Mechanical Properties ◽  
Sintering Temperature ◽  
Slip Casting ◽  
Tetragonal Zirconia ◽  
Cold Isostatic Pressing ◽  
Sintering Process ◽  
Colloidal Processing ◽  
Tooth Color ◽  
Biological Compatibility ◽  
Nanostructured Ceria

The demand for tetragonal zirconia as a dental restorative material has been increasing because of its excellent mechanical properties and resemblance to natural tooth color, as well as its excellent biological compatibility. Cerium oxide (CeO2) has been added to yttria-stabilized zirconia (Y-TZP), and studies have demonstrated that the stability of the tetragonal phase can be significantly improved. Y-TZP with 5wt% CeO2 as a second stabilizer was developed via colloidal process, followed by a suitable sintering process. According to the literature, the sintering process is the most crucial stage in ceramic processing to obtain the most homogeneous structure with high density and hardness. This study aims to investigate the effect of sintering temperature on the mechanical properties of nanostructured ceria–zirconia fabricated via colloidal processing and slip casting process with cold isostatic pressing (CIP). Twenty-five pellet specimens were prepared from ceria–zirconia with 20 nm particle size. CeO2 nanopowder was mixed with Y-TZP nanopowder via colloidal processing. The consolidation of the powder was done via slip casting followed by CIP. The samples were divided into five different sintering temperatures with. Results from FESEM, density and hardness analyses demonstrated statistically significant increase in density and hardness as the sintering temperature increased. The hardness increased from 4.65 GPa to 14.14 GPa, and the density increased from 4.70 to 5.97 (g/cm3) as the sintering temperature increased without changing the holding time. Sintering Ce-Y-TZP at 1600 °C produced samples with homogenous structures, high hardness (14.14 GPa), and full densification with 98% of the theoretical density.

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