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 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 Novel Functionally Gradient Composites Al2O3-Cu-Mo Obtained via Centrifugal Slip Casting

2021 ◽  
Author(s):  
Justyna Zygmuntowicz ◽  
Hanna Winkler ◽  
Marcin Wachowski ◽  
Paulina Piotrkiewicz ◽  
Waldemar Kaszuwara
Keyword(s):  
Liquid Phase ◽  
Slip Casting ◽  
Metallic Phase ◽  
Critical Element ◽  
Phase Content ◽  
Sintering Process ◽  
Cognitive Value ◽  
Functionally Gradient ◽  
Gradient Microstructure ◽  
Original Concept

Abstract The investigations applied the original concept of the formation of materials as hybrid gradient composites. Two innovative technologies were used: formation by centrifugal slip casting and sintering with varying proportions of the liquid phase. This allowed us to create a gradient microstructure. This article presents the study of Al2O3-Cu-Mo gradient composites. This work aimed to determine the effect of the metallic phase content on the composite’s microstructure and basic properties. The most critical element of the study will be determining the ability to control the location and flow of the liquid phase during the sintering process. The research demonstrated that adding a third component in the form of Mo reduces the liquid Cu flow onto the surface of the composites during the sintering process. In this research, we achieve results with high cognitive value. Graphic Abstract

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 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 Manufacturing of Al2O3/Ni/Ti Composites Enhanced by Intermetallic Phases

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3510
Author(s):  
Marcin Wachowski ◽  
Justyna Zygmuntowicz ◽  
Robert Kosturek ◽  
Katarzyna Konopka ◽  
Waldemar Kaszuwara
Keyword(s):  
Mechanical Properties ◽  
Solid Phase ◽  
Slip Casting ◽  
Intermetallic Phases ◽  
X Ray Diffraction ◽  
Casting Method ◽  
Metal Composites ◽  
X Ray ◽  
Solid Phase Content ◽  
Electron Microscope Analysis

In this study, ceramic–metal composites in the Al2O3/Ti/Ni system were fabricated using the slip casting method. Two series of composites with 15 vol.% metal content and different solid phase contents were obtained and examined. A proper fabrication process allows obtaining composites enhanced by intermetallic phases. The microstructure of the base powders, slurries, and sintered composites was analyzed by scanning electron microscope. Analysis of the sedimentation tendency of slurries was carried out. The phase composition of the sintered samples was examined by X-ray diffraction analysis. A monotonic compression test was used to investigate the mechanical properties of the composites. A fractography investigation was also carried out. The research conducted revealed that the slip casting method allows the obtaining of composites enhanced by intermetallic phases (TiNi, Ni3Ti). The results show the correlation between solid-phase content, microstructure, and mechanical properties of the composites.

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