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.

Fracture Behaviour of Pressureless Sintered Nickel-Reinforced Alumina Composites

2005 ◽  
Vol 290 ◽  
pp. 324-327 ◽  
Author(s):  
Alessio Beverina ◽  
Antonio Javier Sanchez-Herencia ◽  
N. Hernández ◽  
Rodrigo Moreno
Keyword(s):  
Colloidal Stability ◽  
Sintering Temperature ◽  
Fracture Behaviour ◽  
Slip Casting ◽  
High Dispersion ◽  
Nickel Aluminum ◽  
Alumina Matrix ◽  
Concentrated Suspensions ◽  
Alumina Composites ◽  
Flowing Atmosphere

Nickel-reinforced alumina composites have been manufactured by aqueous slip casting and pressureless sintered under flowing atmosphere of argon with 0,36 and 1% of oxygen in order to force interfacial reactions leading to the formation of a nickel-aluminum spinel. Colloidal stability of concentrated suspensions of alumina with 5, 10 and 15 vol% of nickel has been studied in terms of zeta potential, rheometry and packing density. The processed composites show a high dispersion of the nickel into the alumina matrix and green densities of 60-70 %th. The effect of sintering temperature and atmosphere on the mechanical behaviour of the composites has been investigated through Vickers indentation and fractographic SEM observations.

High-Toughening Alumina Composites Weakened by Metastable Hexacelsian Interphases

2007 ◽  
Vol 345-346 ◽  
pp. 721-724
Author(s):  
Sang Jin Lee ◽  
Sang Ho Lee
Keyword(s):  
Laminated Composite ◽  
Crack Deflection ◽  
Alumina Matrix ◽  
Electronic Microscopy ◽  
Deflection Curve ◽  
Laminate Design ◽  
Alumina Composite ◽  
Alumina Composites ◽  
Load Deflection Curve ◽  
Work Of Fracture

New laminate design for improved toughness in hexacelsian-alumina composite is introduced. The composite is based on crack deflection in a weak interphase in the alumina matrix and hexacelsian interphase. The strength and toughness of the laminated composite were studied both qualitatively by electronic microscopy and measuring flexure strength. The metastable hexacelsian interphases had partially microcracks to provide crack deflection in the composite, and the crack deflection noticeably proceeded along the meta-stable hexacelsian interphase. Load-deflection curve for the laminate showed improved work of fracture of 2.23 kJ/m2.

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.

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.

The Size and Shape Analysis of Titanium Particles in Composites from ZrO2 – Ti System

2015 ◽  
Vol 797 ◽  
pp. 400-407
Author(s):  
Paula Łada ◽  
Marta Bartnik ◽  
Aleksandra Miazga ◽  
Katarzyna Konopka
Keyword(s):  
Microstructural Characterization ◽  
Partial Solution ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Composite Matrix ◽  
Stereological Analysis ◽  
X Ray ◽  
Eds Analysis ◽  
Ti Powder ◽  
New Phase

The morphology ZrO2-Ti composites depends on used powders substrates, methods of forming and sintering conditions. In this study a composite from the nanosize ZrO2 powder stabilized by 3 mol% Y2O3 and 3 vol. % Ti powder with particle size about 15 μm was prepared. A composite material was formed by uniaxial pressing. Sintering process was conducted in an argon atmosphere at 1300°C with retention time 2h. The selected physical properties of the green body and sintered ZrO2-Ti composites were determined by Archimedes method. The microstructural characterization was carried out using the x-ray diffraction and the scanning electron microscope (SEM) with EDS analysis. Stereological analysis by using computer programs was supported. The SEM observation and EDS analysis of the cross-section of the samples confirmed that the Ti particles are distributed homogenously in analysed areas. The EDS analysis revealed partial solution of titanium in ZrO2 matrix. Moreover, the x-ray diffraction exposed the existence of tetragonal zirconium oxide and titanium or a new phase from Ti-Zr-O system. The stereological analysis showed similarity between the starting particles of Ti powder and particles of titanium in the composite matrix.

scholarly journals AlN ceramics processed by aqueous slip casting

2006 ◽  
Vol 21 (10) ◽  
pp. 2460-2469 ◽  
Author(s):  
S.M. Olhero ◽  
P. Miranzo ◽  
J.M.F. Ferreira
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Zeta Potential ◽  
Slip Casting ◽  
Sintering Aids ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sintering Additives ◽  
Phosphate Species ◽  
Sintered Materials

Fully dense aluminium nitride (AlN) ceramics consolidated by aqueous slip casting were obtained after sintering at 1750 °C for 2 h. The obtained samples were characterized by Vickers hardness (1000 Hv), flexural strength (200 MPa) and thermal conductivity (115 W/mK). YF3 and CaF2 were used as sintering additives in total amounts ranging from 5 to 7 wt% in YF3/CaF2 weight ratios of 1.25, 1.5, and 2. The compatibility between the thermochemically treated AlN powder and the sintering additives in the aqueous suspensions was investigated by rheological and zeta potential measurements. Highly concentrated (50 vol%) and well-dispersed suspensions could be prepared and used to consolidate homogeneous green bodies by slip casting. The phosphate species used to protect the surface AlN particles against hydrolysis could no longer be detected at temperatures higher than 1400 °C. X-ray diffraction results revealed that all the new crystalline phases formed upon sintering belong to the system Al–Y–O–Ca, but their specific compositions as well as the thermal properties of the sintered materials were shown to depend on the total amount and ratio of sintering aids.

Effect of Heating Rate on the Synthesis and Sintering of Ternary Carbide Zr2Al3C4 through Spark Plasma Sintering

2012 ◽  
Vol 508 ◽  
pp. 32-37
Author(s):  
Lian Meng Zhang ◽  
Qi Long Guo ◽  
Jun Guo Li ◽  
Qiang Shen
Keyword(s):  
Heating Rate ◽  
Spark Plasma Sintering ◽  
Raw Materials ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Reaction Route ◽  
Plasma Sintering ◽  
Ternary Carbide ◽  
Spark Plasma ◽  
Sintered Materials

The Nearly Full Dense Zr2Al3C4 Ceramic Was Successfully Fabricated at 1800 °C for 10 min under a Uniaxial Load of 20 MPa in Vacuum by the Spark Plasma Sintering Process, Using a Mixture of Zr, Al and Graphite Powders as Raw Materials. The Reaction Route of Synthesis as Well as the Sintering Conditions of the SPS Technique Were Discussed Based on X-Ray Diffraction Results. The Results Showed that the Heating Rate Can Largely Affect the Loss and Aggregation of Molten Al. Moreover, the Contents of Al4O4C and the Elevated Sintering Temperature Were Beneficial for the Synthesis of Zr2Al3C4 Ceramic. The Microstructures of the Samples Were Observed by Scanning Electron Microscopy, Showing that the as-Synthesized Zr2Al3C4 Has an Anisotropic Microstructure Consisting of Elongated Grains. Compared to the Hot-Pressing, the Starting Temperature for the Formation of Zr3Al3C5 and Al4O4C Phases Was Rather Low. It Indicates that the SPS Technique Can Rapidly Synthesize Zr2Al3C4 from the Zr/Al/C Powders in a Relatively Low Temperature Range. The Mechanical Properties of the Sintered Materials Were Also Investigated, Including the Hardness of 11.66±0.34 GPa, and Fracture Toughness of 4.0 ± 0.4 MPa×m1/2.

scholarly journals Alumina matrix ceramic-nickel composites formed by centrifugal slip casting

2015 ◽  
Vol 9 (4) ◽  
pp. 199-202 ◽  
Author(s):  
Justyna Zygmuntowicz ◽  
Aleksandra Miazga ◽  
Katarzyna Konopka ◽  
Katarzyna Edrysiak ◽  
Waldemar Kaszuwara
Keyword(s):  
Composite Materials ◽  
Rotation Axis ◽  
Quantitative Description ◽  
Slip Casting ◽  
Metal Particles ◽  
Alumina Matrix ◽  
Casting Method ◽  
Composite Fabrication ◽  
Nickel Particles ◽  
Nickel Composites

The paper is focused on the possibility of fabricating the alumina matrix ceramic-nickel composites with gradient concentration of metal particles. Centrifugal slip casting method was chosen for the composite fabrication. This method allows fabrication of the graded distribution of nickel particles in the hollow cylinder composites. The horizontal rotation axis was applied. The samples were characterized by XRD, SEM and quantitative description of the microstructure. The macroscopic as well as SEM observations of the prepared composites confirmed the gradient concentration of Ni particles in the composite materials. The application of the centrifugal slip casting method allows for the graded distribution of metal particles in the samples.

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