scholarly journals Characterization of 3D Printed Yttria-Stabilized Zirconia Parts for Use in Prostheses

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2942
Author(s):  
Irene Buj-Corral ◽  
Daniel Vidal ◽  
Aitor Tejo-Otero ◽  
José Antonio Padilla ◽  
Elena Xuriguera ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Compressive Strength ◽  
Mechanical Strength ◽  
Total Porosity ◽  
Shrinkage Porosity ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Layer Height ◽  
3D Printed ◽  
Extrusion Printing

The main aim of the present paper is to study and analyze surface roughness, shrinkage, porosity, and mechanical strength of dense yttria-stabilized zirconia (YSZ) samples obtained by means of the extrusion printing technique. In the experiments, both print speed and layer height were varied, according to a 22 factorial design. Cuboid samples were defined, and three replicates were obtained for each experiment. After sintering, the shrinkage percentage was calculated in width and in height. Areal surface roughness, Sa, was measured on the lateral walls of the cuboids, and total porosity was determined by means of weight measurement. The compressive strength of the samples was determined. The lowest Sa value of 9.4 μm was obtained with low layer height and high print speed. Shrinkage percentage values ranged between 19% and 28%, and porosity values between 12% and 24%, depending on the printing conditions. Lowest porosity values correspond to low layer height and low print speed. The same conditions allow obtaining the highest average compressive strength value of 176 MPa, although high variability was observed. For this reason, further research will be carried out about mechanical strength of ceramic 3D printed samples. The results of this work will help choose appropriate printing conditions extrusion processes for ceramics.

MICROSTRUCTURAL, SURFACE ROUGHNESS AND WETTABILITY OF TITANIUM ALLOY COATED BY YZP-30WT. % TIO2 FOR DENTAL APPLICATION

2018 ◽  
Vol 80 (2) ◽  
Author(s):  
Afida Jemat ◽  
Mariyam Jameelah Ghazali ◽  
Masfueh Razali ◽  
Yuichi Otsuka
Keyword(s):  
Surface Roughness ◽  
Ceramic Coating ◽  
Sem Analysis ◽  
Yttria Stabilized Zirconia ◽  
High Porosity ◽  
Stabilized Zirconia ◽  
Dental Application ◽  
Spray Technique ◽  
Contact Angle Analysis ◽  
Microstructural Surface

Various roughness and surface topography of titanium coated ceramic material have been developed and used in clinical trials especially in a medical implant. The present work aimed to investigate the phase and microstructural of the yttria stabilized zirconia (YZP) coating reinforced titania (TiO2) and its effects on wettability for dental implant application. Plasma spray technique was used to prepare the pure YZP and YZP-30 wt.% TiO2 coatings. The titanium alloys coated with YZP/TiO2 were investigated through scanning electron microscopy (SEM) analysis, roughness measurements, and contact angle analysis. The SEM analysis demonstrated a distinguished lamellae structure of YZP and TiO2 in the coating. Instead of low wettability, the YZP-30 wt.% TiO2 ceramic coating demonstrated high porosity and  surface roughness (7.97±0.4 µm) than the pure YZP coating (7.06±0.9 µm) that is beneficial for cell growth and attachment.

Microwave Processing of Redox Ceramic-Metal Composites

1996 ◽  
Vol 430 ◽  
Author(s):  
R. R. Di Fiore ◽  
D. E. Clark
Keyword(s):  
Compressive Strength ◽  
Activated Carbon ◽  
Copper Oxide ◽  
Yttria Stabilized Zirconia ◽  
Carbon Powder ◽  
Stabilized Zirconia ◽  
Metal Composites ◽  
Reducing Atmosphere ◽  
Fine Powders ◽  
Microwave Hybrid Heating

AbstractCeramic-metal composites have been produced through the reduction of copper oxide (CuO) and the oxidation of aluminum in a reducing atmosphere. Fine powders of CuO and Al (<38μm) were mixed with yttria stabilized zirconia, ball milled and uniaxially pressed into disc samples. Microwave hybrid heating was used to process samples using β-SiC and activated carbon powder as susceptors. Pyrolysis of the carbon provided the reducing atmosphere. The resulting Ctt/Al2O3/Y-ZrO2 composite was analyzed for density, compressive strength and resistivity.

scholarly journals The Influence of Gum Arabic Admixture on the Mechanical Properties of Lime-Metakaolin Paste Used as Binder in Hemp Concrete

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6775
Author(s):  
Przemysław Brzyski
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Mechanical Strength ◽  
Pore Diameter ◽  
Gum Arabic ◽  
Total Porosity ◽  
Hydrated Lime ◽  
Partial Replacement ◽  
Reference Formulation ◽  
Strength Parameters

Organic admixtures based on polysaccharides are used in construction for modifying the properties of mortars and concretes. Gum arabic is an example of a polysaccharide-based biopolymer. The aim of the article was to investigate the possibilities of improving the strength parameters of a binder paste based on hydrated lime and metakaolin. The paste was modified with powdered gum arabic at 1%, 3% and 5% (by mass) as a partial replacement for the binder mix. The influence of the admixture on the pore size distribution as well as flexural and compressive strength was investigated. The admixture enhanced the total porosity of the paste, increasing the pore diameter compared with the reference formulation. The increase in porosity, in turn, did not reduce the mechanical strength. Conversely, the admixture in the amount of 3% and 5% caused a significant increase in the flexural (by about 300% in relation to reference paste) and compressive strengths (by 25% and 60%, respectively). The tested pastes were used as a binder in a composite based on hemp shives. The influence of binder modification on the water absorption and compressive strength of hemp concrete was tested. The strength of the composite soaked in water was also tested. The modification of the binder with gum arabic in the amount of 3% and 5% increased the compressive strength of hemp concrete (not soaked in water) by 53% and 92%, respectively and reduced the mass absorptivity by 6.6% and 10.4%, respectively.

Improvement of Mechanical Strength of 8 mol % Yttria-Stabilized Zirconia Ceramics by Spark-Plasma Sintering

2002 ◽  
Vol 149 (4) ◽  
pp. A455 ◽  
Author(s):  
Tomonari Takeuchi ◽  
Isao Kondoh ◽  
Nobuyuki Tamari ◽  
Nalini Balakrishnan ◽  
Katsuhiro Nomura ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Spark Plasma Sintering ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Zirconia Ceramics ◽  
Plasma Sintering ◽  
Spark Plasma

An Investigation of Phase Crystallinity in Laser Modified Yttria Stabilized Zirconia (YSZ) Thermal Barrier Coating

2014 ◽  
Vol 611-612 ◽  
pp. 1601-1607
Author(s):  
Mohamed Suffian Reza ◽  
Syarifah Nur Aqida ◽  
Mohd Radzi Mohd Toff
Keyword(s):  
Surface Roughness ◽  
Thermal Barrier Coating ◽  
Pulse Repetition Frequency ◽  
Sample Surface ◽  
Yttria Stabilized Zirconia ◽  
Thermal Barrier ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
X Ray ◽  
Barrier Coating

This paper presents laser surface modification process of plasma sprayed yttria stabilized zirconia (YSZ) thermal barrier coating (TBC) for enhanced hardness properties and low surface roughness. A 300W JK300HPS Nd: YAG laser was used to process YSZ TBC sample surface. The parameters selected for examination were laser power, pulse repetition frequency (PRF) and residence time. Micrographs of the TBC system were captured using EVO 15 Scanning Electron Microscope (SEM). Surface roughness was measured using 2-dimensional stylus profilometer. X-ray diffraction analysis (XRD) was conducted to measure phase crystallinity of the laser-modified coating surface. X-ray diffraction patterns were recorded in the 2θ range of 10 to 80° using Bruker D8 Advance system with 0.7Å wavelength from a copper source (~1.5Å). The laser modified surface exhibited higher crystallinity compared to the as-sprayed samples. The presence of tetragonal phase was detected in the as-sprayed and laser processed samples. The hardness properties of laser modified TBC increased 15% of the as-sprayed sample. These finding are significant to development of thermal barrier coating design optimization for enhanced surface properties of semi-solid forming die.

scholarly journals Preparation and Optimization Green Gel Casting Technique for Manufacturing Near-Net-Shape Ceramics Using Genetic Algorithm

2021 ◽  
Vol 877 (1) ◽  
pp. 012035
Author(s):  
Mohammed A. Ahmed Al-dujaili ◽  
Imad Ali Al-hydary ◽  
Montaha Abdalhussien
Keyword(s):  
Genetic Algorithm ◽  
Aqueous Solution ◽  
Surface Roughness ◽  
Yttria Stabilized Zirconia ◽  
Solid Loading ◽  
Stabilized Zirconia ◽  
Casting Technique ◽  
Gel Casting ◽  
Near Net Shape ◽  
Cross Linker

Abstract Gel casting technique is a promising technology that has ability to produce near-net shape ceramics via using toxic and non-ecofriendly agents. The current work aim to develop green gel casting technique using water as a solvent, agar as a gelling agent, and the microwave thermal treatment instead of cross linker. 8mo l% Yttria stabilized zirconia was selected as a case study to produce near-net shape ceramics. The experimental work involved the preparation of Yttria stabilized zirconia nanoparticles via chemical precipitation method. The effect study of agar ratio, Yttria stabilized zirconia solid loading percent on the physical, mechanical, surface properties of the prepared ceramics and selecting of suitable casting conditions. The study has been found that the microwave thermal treatment develops thermally activated cross linking in the agar aqueous solution leading to higher glass transition temperature for agar. The green combination (agar aqueous solution and microwave treatment) can be used as alternative to (monomer, solvent, cross linker) Companion. Also, using the ultrasonic treatment can effectively eliminate needs for dispersants, also the vacuum de-airing treatment. Yttria stabilized zirconia ceramic with high dimensional accuracy, low surface roughness (Ra=2. 81 nm) can be obtained using an agar ratio of (0.4%) and solid loading of (65%). The sample can be moulded with complex shape and the green gel, also the pre-sintered body is machineable. The sintered samples have a porosity of (31%) and compressive strength of (234MPa). Regression analysis and genetic algorithm are showed that the obtained microhardness, compressive strength, and surface roughness are predictable.

Effect of Laser Treatment on the Surface Roughness of Multilayer Plasma Sprayed Thermal Barrier Coating System

2021 ◽  
Vol 39 (2A) ◽  
pp. 180-188
Author(s):  
Mais A. Habeeb ◽  
Mohammed J. Kadhim ◽  
Fadhil A. Hashim ◽  
Maryam A. Bash
Keyword(s):  
Surface Roughness ◽  
Yttria Stabilized Zirconia ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Stabilized Zirconia ◽  
Barrier Coating ◽  
Moderate Power ◽  
Analysis Of Results ◽  
And Performance ◽  
Plasma Sprayed

Thermal barrier coatings (TBCs) are used in advanced engines working at higher temperatures. Higher efficiency and performance of gas turbine engines will require careful selection of TBCs. In this study, Ni22Cr10Al1.0Y (Amdry 9625) bond coat and two types of top coat including ceria stabilized zirconia (CSZ) ZrO2-24CeO2-2.5Y2O3) and yttria stabilized zirconia (YSZ) ZrO2-8Y2O3 were deposited on IN 625 by air plasma spraying (APS). The thickness of the duplex ceramic coat based on zirconia was in the range between 350 to 400 µm. The effect of  high power Yb:YAG solid state laser  at different laser parameters on feature, microstructure and roughness of plasma sprayed and laser sealed coating of multilayer ceria stabilized zirconia/ yttria stabilized zirconia was investigated. Surface roughness has been reduced significantly after laser sealing. The effect of laser process parameters carried out using Taguchi’s L16 orthogonal array design. Minimum roughness can be obtained at moderate power density and longer interaction time with sufficient specific energy to produce complete melting of coating. Characterization and analysis of results was achieved by employing scanning electron microscopy (SEM) , (EDS) and image J analysis. It was found from the results, there were significant improvements in the performance of plasma sprayed coatings after laser sealing due to the reduction of surface coating defects.

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