scholarly journals Asymmetric LSCF Membranes Utilizing Commercial Powders

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 614 ◽  
Author(s):  
Paolo Fedeli ◽  
Francesca Drago ◽  
Falk Schulze-Küppers ◽  
Stefan Baumann
Keyword(s):  
Manufacturing Process ◽  
Sintering Temperature ◽  
Tape Casting ◽  
Oxygen Flux ◽  
Microstructural Properties ◽  
Asymmetric Membranes ◽  
Custom Made ◽  
Ceramic Manufacturing ◽  
Slurry Composition ◽  
Flat Crack

Powders of constant morphology and quality are indispensable for reproducible ceramic manufacturing. In this study, commercially available powders were characterized regarding their microstructural properties and screened for a reproducible membrane manufacturing process, which was done by sequential tape casting. Basing on this, the slurry composition and ratio of ingredients were systematically varied in order to obtain flat, crack-free green tapes suitable for upscaling of the manufacturing process. Debinding and sintering parameters were adjusted to obtain defect-free membranes with diminished bending. The crucial parameters are the heating ramp, sintering temperature, and dwell time. The microstructure of the asymmetric membranes was investigated, leading to a support porosity of approximately 35% and a membrane layer thickness of around 20 µm. Microstructure and oxygen flux are comparable to asymmetric La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) membranes manufactured from custom-made powder, showing an oxygen flux of > 1 mL⋅cm−2⋅min at 900 °C in air/Ar gradient.

scholarly journals Role of Sintering Temperature in Production of Nepheline Ceramics-Based Geopolymer with Addition of Ultra-High Molecular Weight Polyethylene

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1077
Author(s):  
Romisuhani Ahmad ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Wan Mastura Wan Ibrahim ◽  
Kamarudin Hussin ◽  
Fakhryna Hannanee Ahmad Zaidi ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Sintering Temperature ◽  
Ceramic Materials ◽  
Microstructural Properties ◽  
Sintering Process ◽  
Final Microstructure ◽  
Change Of Microstructure ◽  
Ultra High Molecular Weight

The primary motivation of developing ceramic materials using geopolymer method is to minimize the reliance on high sintering temperatures. The ultra-high molecular weight polyethylene (UHMWPE) was added as binder and reinforces the nepheline ceramics based geopolymer. The samples were sintered at 900 °C, 1000 °C, 1100 °C, and 1200 °C to elucidate the influence of sintering on the physical and microstructural properties. The results indicated that a maximum flexural strength of 92 MPa is attainable once the samples are used to be sintered at 1200 °C. It was also determined that the density, porosity, volumetric shrinkage, and water absorption of the samples also affected by the sintering due to the change of microstructure and crystallinity. The IR spectra reveal that the band at around 1400 cm−1 becomes weak, indicating that sodium carbonate decomposed and began to react with the silica and alumina released from gels to form nepheline phases. The sintering process influence in the development of the final microstructure thus improving the properties of the ceramic materials.

Preparation and Characterization of Textured CaBi4-XLaXTi4O15 Ceramics

2011 ◽  
Vol 492 ◽  
pp. 218-221
Author(s):  
Guo Xi Jin ◽  
Xiao Bo Wu ◽  
Ling Di Chen ◽  
Yan Xue Tang ◽  
Ben Xue Jiang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Electric Field ◽  
Sintering Temperature ◽  
Tape Casting ◽  
Particle Method ◽  
Textured Ceramics ◽  
The Relationship

La3+ doped textured ceramics CaBi4-xLaxTi4O15were prepared by oriented consolidation of anisometric particle method with tape casting. The orientation was improved by modifying sintering temperature. The doping of La3+in orientated CaBi4-xLaxTi4O15ceramics increased the dielectric constant. The higher dielectric constant was obtained in the direction which tropism parallels to the electric field. The relationship between dielectric constant and orientation was discussed.

Performance Improvement of (La,Sr)MnO3 and (La,Sr)(Co,Fe)O3-Type Anode-Supported SOFCs

2006 ◽  
Vol 3 (3) ◽  
pp. 263-270 ◽  
Author(s):  
Vincent A. C. Haanappel ◽  
Josef Mertens ◽  
Andreas Mai
Keyword(s):  
Electrochemical Performance ◽  
Performance Improvement ◽  
Sintering Temperature ◽  
High Reliability ◽  
Single Cells ◽  
Tape Casting ◽  
Slip Casting ◽  
Production Costs ◽  
Processing Route ◽  
Functional Layer

Targets in the development of anode-supported or planar solid oxide fuel cells (SOFCs) are low operation temperatures, high durability, high reliability, high power density, and low production costs. During the past ten years steps have already been taken at Forschungszentrum Jülich to lower the operating temperatures while maintaining the power output. This was achieved by optimizing processing and microstructural parameters of the electrodes. This paper presents the latest results concerning performance improvement through variations of the processing route and the microstructure of La0.65Sr0.3MnO3 (LSM) and La0.58Sr0.4Co0.2Fe0.8O3−δ (LSCF)-type SOFCs. In the case of the LSM-type single cells, the following aspects relating to the electrochemical performance were investigated in more detail: (1) production of the anode substrate by tape casting versus warm pressing; (2) deposition of the anode functional layer (AFL) and electrolyte by screen printing versus vacuum slip casting; (3) use of noncalcined and non-ground YSZ for applying the cathode functional layer (CFL); and (4) sintering temperature of the CFL and cathode current collector layer (CCCL). In the case of LSCF-type cells, a systematic approach was initiated for optimizing the Ce0.8Gd0.2O2−δ (CGO) diffusion barrier layer: (1) deposition techniques of the CGO layer and (2) sintering temperature of the screen-printed CGO layer. Results have shown that certain modifications of the processing route led to a slightly lower electrochemical performance, whereas others did not affect the performance at all. Regarding LSCF-type SOFCs, a slight improvement of the performance was achieved by optimizing the sintering temperature of the CGO layer.

Imperial Needs, Imperial Methods: Chimú Ceramic Manufacturing Process Through CT Scan Analysis of Stirrup-Spout Bottles

2016 ◽  
Vol 27 (2) ◽  
pp. 238-256
Author(s):  
Valentine Wauters
Keyword(s):  
Computed Tomography ◽  
Ct Scan ◽  
Manufacturing Process ◽  
Ceramic Production ◽  
Ct Scans ◽  
Manufacturing Processes ◽  
Ceramic Assemblage ◽  
Ceramic Manufacturing ◽  
Industrial Level ◽  
Ct Scan Analysis

The stirrup-spout bottle is one of the most representative forms in the Chimú (A.D. 900-1470) ceramic repertoire. I discuss the ceramic assemblage of this coastal culture and describes more precisely the various manufacturing processes of the stirrup-spout bottle. Although molds used to produce these complex vessels are known today, only little information has been published on the various stages involved in their manufacture. My purpose is to contribute to this research using medical imaging computed tomography (CT) scans of intact stirrup-spout vessels. Based on my findings, I propose that changes in the construction of these vessels correlated with a transition in ceramic production to a semi-industrial level during the time of the Chimú Empire.

scholarly journals Determination of Optimal Process Parameters In The Process Of Making Ceramics To Maximize Flexural Strength Using the Taguchi Method (Case Study at the Kasongan Ceramics UKM Center, Bantul, DIY)

OPSI ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 66
Author(s):  
Sutrisno Sutrisno Sutrisno ◽  
Dyah Rachmawati Lucitasari
Keyword(s):  
Flexural Strength ◽  
Taguchi Method ◽  
Process Parameters ◽  
Orthogonal Array ◽  
Manufacturing Process ◽  
Bending Strength ◽  
Total Production ◽  
Ceramic Manufacturing

Kasongan Ceramic UKM Center is an association of UKM which makes goods made from clay. Kasongan Ceramic UKM Center, located in Bantul Regency, DIY. The problem that is often experienced by Kasongan Ceramics Center is that products that are often cracked, warped, and easily brittle. The total production of Kasongan UKM Center from September 2019 to February 2020 was 32,256 units, with the number of defective products amounting to 3,873 or 12% of the total production. Based on the studies that have been done, it can be concluded that the defects of cracks, curling, and brittleness that occur are one of them caused by the less than optimal flexural strength of the ceramic products produced. To maximize the flexural strength of the ceramic products produced, the optimal ceramic manufacturing process parameters will be determined using the Taguchi method. To maximize the flexural strength in the process of making ceramics using the Taguchi method, it is necessary to do an experimental design. The first thing to do is to determine the controlled factors and levels in the ceramic manufacturing process that affect the flexural strength. After that determine a suitable orthogonal array and perform experiments based on the specified orthogonal array. The experimental results will be tested for its flexural strength in the laboratory. The resulting flexural strength data will be processed to determine the optimal ceramic manufacturing process parameters that maximize the bending strength of ceramics. Based on the data processing carried out, it is found that the optimal ceramic-making process parameters at the Kasongan Ceramics UKM Center that maximize flexural strength are the composition of 3 parts Godean clay, 3 parts Kasongan clay composition, 1 part sand composition, and burning using an open tub. 

scholarly journals Development and Accuracy Test of a Fused Deposition Modeling (FDM) 3D Printing using H-Bot Mechanism

2021 ◽  
Vol 3 (1) ◽  
pp. 46-53
Author(s):  
Budi Hadisujoto ◽  
Robby Wijaya
Keyword(s):  
3D Printing ◽  
Manufacturing Process ◽  
Fused Deposition Modeling ◽  
Industrial Revolution ◽  
3D Printer ◽  
Initial Development ◽  
Fused Deposition ◽  
Accuracy Test ◽  
Custom Made ◽  
Deposition Modeling

Additive manufacturing process known as the 3D printing process is an advanced manufacturing process including one of the components to support industrial revolution 4.0. The initial development of a 3D printing machine at Sampoerna University is the background of this research. The 3D printing setup of Fused Deposition Modeling (FDM) was built using H-bot moving mechanism by considering the rigidity aspect. The FDM printing method is selected due to its cost and reliability. In this early development, the brackets were custom made using a 3D printer with Polylactic Acid (PLA) material. The result showed that the software worked properly in accordance with the assembled mechanical and electrical parts. The 3D printer could print simple objects such as planes and cubes with small dimensions. However, the printing specimen still lacked accuracy caused by the less rigidity of linear rail brackets, less coplanar belt arrangement, and error in some electronic components.

scholarly journals Optimizing the conductivity, microstructure and mechanical properties of tape-cast LATP with LiF and SiO2 additives

2021 ◽  
Author(s):  
Jürgen Peter Gross ◽  
Jürgen Malzbender ◽  
Enkhtsetseg Dashjav ◽  
Frank Tietz ◽  
Ruth Schwaiger
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Sintering Temperature ◽  
General Trend ◽  
Tape Casting ◽  
Growth Behavior ◽  
Crack Growth Behavior ◽  
Microstructure And Mechanical Properties ◽  
Solid State Batteries ◽  
Tape Cast

Abstract LATP sheets with LiF and SiO2 addition prepared by tape casting as electrolytes for solid-state batteries were characterized regarding conductivity, microstructure and mechanical properties aiming towards an optimized composition. The use of additives permitted a lowering of the sintering temperature. As general trend, higher LiF to SiO2 ratios led to lower porosities. This decrease in the porosity corresponds to an increase of the ionic conductivity as well as higher values of elastic modulus and hardness determined by indentation testing. Micro-pillar testing was used to assess the crack growth behavior, revealing weak grain boundaries.

scholarly journals Integrated 3D Information for Custom-Made Bone Grafts: Focus on Biphasic Calcium Phosphate Bone Substitute Biomaterials

2020 ◽  
Vol 17 (14) ◽  
pp. 4931
Author(s):  
Alessandra Giuliani ◽  
Maria Laura Gatto ◽  
Luigi Gobbi ◽  
Francesco Guido Mangano ◽  
Carlo Mangano
Keyword(s):  
Calcium Phosphate ◽  
Biphasic Calcium Phosphate ◽  
Alveolar Bone ◽  
Sintering Temperature ◽  
Calcium Phosphates ◽  
Compressive Loading ◽  
Peak Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Custom Made

Purpose: Several studies showed that the sintering temperature of 1250 °C could affect the formation of α-Ca3(PO4)2, which is responsible for the reduction of the hardness value of biphasic calcium phosphate biocomposites, but they did not evaluate the inference of the sintering time at peak temperature on transition of β-Ca3(PO4)2 to α-Ca3(PO4)2. This analysis explored, in an innovative way, inferences and correlations between volumetric microstructure, mechanical properties, sintering temperature, and time at peak temperature in order to find the best sintering conditions for biphasic calcium phosphate composites grafted in severe alveolar bone defects. Methods: Sintered biphasic calcium phosphates (30%-hydroxyapatite/70%-tricalcium phosphate) were tested by microCT imaging for the 3D morphometric analysis, by compressive loading to find their mechanical parameters, and by X-ray diffraction to quantify the phases via Rietveld refinement for different sintering temperatures and times at the peak temperature. Data were analysed in terms of statistical inference using Pearson’s correlation coefficients. Results: All the studied scaffolds closely mimicked the alveolar organization of the jawbone, independently on the sintering temperatures and times; however, mechanical testing revealed that the group with peak temperature, which lasted for 2 hours at 1250 °C, showed the highest strength both at the ultimate point and at fracture point. Conclusion: The good mechanical performances of the group with peak temperature, which lasted for 2 hours at 1250 °C, is most likely due to the absence of the α-Ca3(PO4)2 phase, as revealed by X-ray diffraction. However, we detected its presence after sintering at the same peak temperature for longer times, showing the time-dependence, combined with the temperature-dependence, of the β-Ca3(PO4)2 to α-Ca3(PO4)2 transition.

Tape Casting and Dielectric Properties of Zn2Te3O8-Based Ceramics with an Ultra-Low Sintering Temperature

2009 ◽  
Vol 6 (4) ◽  
pp. 531-536 ◽  
Author(s):  
Johanna Honkamo ◽  
Heli Jantunen ◽  
Ganesanpotti Subodh ◽  
Mailadil T. Sebastian ◽  
Pezholil Mohanan
Keyword(s):  
Dielectric Properties ◽  
Sintering Temperature ◽  
Tape Casting ◽  
Low Sintering Temperature
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