Low Cost Fabrication and Performance of YSZ Electrolyte Thin-Substrate

2007 ◽  
Vol 280-283 ◽  
pp. 439-442
Author(s):  
Da Ming Chen ◽  
Xiao Guang Liu ◽  
Jian Feng Tong ◽  
Bao Wei Li
Keyword(s):  
Ph Value ◽  
Low Cost ◽  
Solid Content ◽  
High Density ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Gel Casting ◽  
A New Technique ◽  
And Performance ◽  
Ysz Electrolyte

A new technique for the fabrication of yttria stabilized zirconia (YSZ) substrates using aqueous gel-casting has been developed. This technique has been used to fabricate planar thin-substrate YSZ fuel cells. A thin-substrate YSZ electrolyte with high density and low porosity was prepared by this method with 57vol% solid content slurry. The character of the technique was discussed based on the influence of dispersant and pH value on slurry. After sintering, the YSZ electrolyte thickness is between 100 and 200µm, and the electrolyte area is 100 × 100 mm2. The research shows that aqueous gel-casting allows fabricate thin YSZ substrate with high density and homogenous structure. The method is suitable for preparing thin-substrate electrolyte of yttria stabilized zirconia.

The Stability of TZP-YSZ Binary Suspensions

2007 ◽  
Vol 336-338 ◽  
pp. 2385-2387 ◽  
Author(s):  
Ping Yun Li ◽  
Guo Jun Li ◽  
Rui Ming Ren
Keyword(s):  
Mechanical Properties ◽  
Ph Value ◽  
Chemical Properties ◽  
Solid Content ◽  
Surface Chemical ◽  
Viscosity Measurements ◽  
Gel Casting ◽  
Isoelectric Points ◽  
The Stability ◽  
Ysz Electrolyte

The binary micrometer YSZ-TZP suspensions were prepared for the gel-casting molding of YSZ electrolyte in order to improve the mechanical properties of YSZ. The potential, sedimentation and viscosity of YSZ, TZP and TZP-YSZ suspensions were investigated. The results indicated that the dispersant (PAA NH4) can greatly affect the surface chemical properties of both YSZ and TZP, and it can also change the isoelectric points (IEP) of the two powders to lower pH value. The potential and sedimentation tests indicate that the stable suspensions are prepared when pH is between 8 and 10. The viscosity measurements showed that there exists an optimum dispersant content for each suspension. The lowest viscosity can be obtained at the optimum dispersant content. The solid content of the stable micrometer TZP-YSZ suspensions can reach as high as 50vol%.

scholarly journals Simulasi Diameter Gel Basah Pada Fabrikasi Kernel Yttria-Stabilized Zirconia Menggunakan Alat Gel-Casting

2018 ◽  
Vol 24 (3) ◽  
Author(s):  
Erilia Yusnitha ◽  
Sarjono Sarjono ◽  
Sri Rinanti Susilowati ◽  
Winter Dewayatna ◽  
Wahyudi Budi Setiawan
Keyword(s):  
Vinyl Alcohol ◽  
Yttria Stabilized Zirconia ◽  
Poly Vinyl Alcohol ◽  
Nitrate Hexahydrate ◽  
Trial And Error ◽  
Stabilized Zirconia ◽  
Gel Casting

Simulasi Diameter Gel Basah Pada Fabrikasi Kernel Yttria-Stabilized Zirconia Menggunakan Alat Gel-Casting. Pada proses pembuatan kernel yttria-stabilized zirconia (YSZ), broth diteteskan melalui alat gel-casting untuk membentuk gel basah YSZ. Broth adalah umpan alat gel-casting yang berupa larutan terdiri dari zirconium (IV) nitrate, yttrium (III) nitrate hexahydrate, urea, tetrahydrofurfuryl alcohol (THFA), dan poly vinyl alcohol (PVA). Parameter proses alat gel-casting seperti frekuensi vibrasi dan kecepatan aliran broth diatur untuk memperoleh bentuk dan ukuran diameter gel basah yang diinginkan. Alat gel-casting yang berada di PTBBN BATAN memiliki satu buah nozzle dengan diameter 1 mm. Kegiatan simulasi ini perlu dilakukan untuk mengurangi jumlah eksperimen di laboratorium sehingga mengurangi volume limbah yang diakibatkan trial and error dalam eksperimen. Selain itu, simulasi ini bertujuan untuk memprediksi diameter gel basah yang dihasilkan. Oleh karena itu, simulasi diameter gel basah perlu dilakukan dan diverifikasi dengan hasil eksperimen. Berdasarkan hipotesa, simulasi diameter gel basah dapat dilakukan dengan memperhitungkan parameter alat gel-casting seperti kecepatan aliran broth dan frekuensi vibrasi. Selain itu karakteristik dari broth seperti densitas juga mempengaruhi diameter gel basah. Diameter gel basah yang dihasilkan alat gel-casting diukur menggunakan alat mikroskop digital. Diameter gel basah dari eksperimen didekati menggunakan persamaan yang dimodifikasi dengan memperhitungkan frekuensi vibrasi, kecepatan aliran broth, konsentrasi metal dalam broth dan densitas broth. Hasil simulasi menunjukkan penyimpangan yang lebih kecil dari simulasi menggunakan persamaan sederhana yang hanya memperhitungkan frekuensi vibrasi dan kecepatan aliran broth.Kata kunci: simulasi, diameter, gel basah, broth, alat gel-casting.

Sinterability of 8 mol% Yttria Stabilized Zirconia

2018 ◽  
Vol 280 ◽  
pp. 102-108
Author(s):  
Tinesha Selvaraj ◽  
Johar Banjuraizah ◽  
S.F. Khor ◽  
M.N. Mohd Zainol
Keyword(s):  
Low Cost ◽  
Crystal Structure Analysis ◽  
Yttria Stabilized Zirconia ◽  
Holding Time ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
Holding Period ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Sintering Behaviour

The sintering behaviour of low cost 8 mol% yttria stabilized zirconia powders has been studied. The effect of sintering holding time of the sintered granulated and milled 8YSZ were determined using density measurements, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The elemental composition, particle size and morphology of the as-received 8YSZ powder and proceed for milling was investigated. 48 hours of ball milling on granulated 8YSZ resulted rises in specific surface area and sintered at 1550°C with the various period of time (4, 5, 6 and 7 hours). The milled 8YSZ sample with 5h sintering holding period coded as F5, sintering activity improved and the relative density came up to 98.3%. But then, granulated 8YSZ achieved only 62.7% with 5 hours holding time. Crystal structure analysis for milled 8YSZ powder consists of 59.6% of cubic ZrO2 phase, 40.1% of tetragonal ZrO2 and 0.3% of monoclinic ZrO2. Meanwhile, granulated 8YSZ indicated low content in cubic ZrO2 but high amount in monoclinic ZrO2 phase. In brief, low cost 8YSZ reached higher densification of 98% successfully.

Low Temperature Synthesis of Lanthanum Silicate Apatite Type by Modified Sol Gel Process

2014 ◽  
Vol 975 ◽  
pp. 143-148 ◽  
Author(s):  
Agatha Matos Misso ◽  
Daniel Ricco Elias ◽  
Fernando dos Santos ◽  
Chieko Yamagata
Keyword(s):  
Colloidal Silica ◽  
High Efficiency ◽  
Ceramic Body ◽  
Low Cost ◽  
Sol Gel ◽  
Lanthanum Nitrate ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Lanthanum Silicate ◽  
Apatite Type

Rare earth silicate apatite type is a very important and promising material for application as an electrolyte in IT-SOFC (Intermediate Temperature Solid Oxide Fuel Cell). Lanthanum silicate apatite, La9,33Si6O26, exhibits high conductivity and has high efficiency, long term stability, fuel flexibility, low emissions and relatively low cost compared to yttria stabilized zirconia (YSZ - yttria stabilized zirconia), at temperatures between 600 to 800 °C. One of the problems of YSZ is its high operating temperature which results in long starting times and problems of mechanical and chemical compatibility. The interest of investigating lanthanum silicate apatite as an electrolyte is to overcome the problems caused by high temperature operation required by YSZ electrolyte. In the present study, sol-gel method was used to synthesize La9,33Si6O26. Initially, the reagents (sodium silicate and lanthanum nitrate) were mixed to obtain colloidal silica. Then, this gel containing lanthanum nitrate was thermally treated to allow the melting of lanthanum nitrate salt distributed on colloidal silica. The aim of this study was to verify if this method permits the formation of La9,33Si6O26 pure apatite phase, in order to obtain fine powders and uniform particles for further processing and obtaining a ceramic body.

INFLUENCE OF SINTERING TEMPERATURE ON TRANSLUCENCY OF YTTRIA-STABILIZED ZIRCONIA FOR DENTAL CROWN APPLICATIONS

2016 ◽  
Vol 78 (11-3) ◽  
Author(s):  
Chin Chuin Hao ◽  
Andanastuti Muchtar ◽  
Che Husna Azhari ◽  
Masfueh Razali ◽  
Mohamed Aboras
Keyword(s):  
Light Scattering ◽  
Light Transmission ◽  
Sintering Temperature ◽  
High Density ◽  
Yttria Stabilized Zirconia ◽  
Integrating Sphere ◽  
Stabilized Zirconia ◽  
Scattering Effect ◽  
Light Scattering Effect ◽  
Dental Crown

This study aims to investigate the effect of sintering temperature on the translucency of yttria-stabilized zirconia (YSZ) for dental crown applications. YSZ suspension was treated by colloidal processing and 24 h of sedimentation to eliminate agglomerates and aggregates. The green bodies of YSZ were then shaped into pellets through slip casting. These bodies were sintered into a final shape at 1450 °C–1650 °C. The densities of the specimens were measured using Archimedes method. Light transmission of the YSZ specimen was also evaluated using a spectrophotometer with an integrating sphere. Morphological analysis was conducted with field-emission scanning electron microscopy. Results showed that sintering temperature significantly influenced the density, light transmission, and microstructure of YSZ. High sintering temperatures produced YSZ with a compact and homogeneous microstructure and a high density. Furthermore, the low light scattering effect on the porosity-free microstructure yielded light transmission as high as 37% in YSZ sintered at 1650 °C. The optimal sintering temperature was found to be 1600 °C, at which 34% light transmission was generated. In conclusion, high sintering temperatures improved the translucency of YSZ. This effect was attributed to effective densification of grains and elimination of pores at high temperatures, thereby alleviating the light scattering effect of the pores. At the optimal temperature, YSZ with high density and translucency and a compact microstructure was formed

scholarly journals Facile Synthesis of Cauliflower Leaves Biochar at Low Temperature in the Air Atmosphere for Cu(II) and Pb(II) Removal from Water

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3163 ◽  
Author(s):  
Qilong Ge ◽  
Qi Tian ◽  
Muhammad Moeen ◽  
Sufang Wang
Keyword(s):  
Low Temperature ◽  
Ph Value ◽  
Low Cost ◽  
Competitive Sorption ◽  
Complexation Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Air Atmosphere ◽  
Phosphorus Containing ◽  
And Performance

In this study, a facile and low-cost method for biochar (CLB) preparation from vegetable waste (cauliflower leaves) was developed at a low temperature (120 °C) in the air atmosphere. The prepared mechanism, adsorption mechanism, and performance of CLB for Cu(II) and Pb(II) sorption were investigated using Scanning electron microscopy- energy dispersive X-ray spectroscopy(SEM-EDS), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), and a series of sorption experiments. Then the CLB was subjected to single and double element sorption studies to examine the effect of pH value on the Cu(II)/Pb(II) sorption capacities and then competitive sorption priority. There are both more hydroxyl (–OH) and carboxyl (–COOH) functional groups on the surface of CLB compared to those from control (without H3PO4 impregnation), resulting in more ion exchanges and complexation reaction for CLB with Cu(II) and Pb(II). Besides, the phosphorus-containing groups (e.g., P = OOH, P = O.), which newly formed with H3PO4 impregnation, could also enhance sorption, especially for Pb(II), this way leaded to its adsorption and precipitation as Pb5(PO4)3OH crystals. The performance of maximum adsorption capacities of CLB toward Cu(II) and Pb(II) were 81.43 and 224.60 mg/g, respectively. This sorption was slightly pH-dependent, except that the sorption capacity improved significantly as the pH value of the solution increased from 2 to 4. Competitive sorption experiment confirmed that Pb(II) had a higher sorption priority than Cu(II).

Fabrication and Performance of Anode-Supported Micro-Tubular Solid Oxide Fuel Cells

2006 ◽  
Vol 3 (4) ◽  
pp. 482-486 ◽  
Author(s):  
Jakub Pusz ◽  
Alidad Mohammadi ◽  
Nigel M. Sammes
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Lanthanum Strontium Manganite ◽  
Scanning Electron Microscopy Micrographs ◽  
Stabilized Zirconia ◽  
Excellent Performance ◽  
Lanthanum Strontium ◽  
And Performance ◽  
Ysz Electrolyte

A solid oxide fuel cell was fabricated using standard NiO/8YSZ cermet anode, 8mol% yttria stabilized zirconia (YSZ) electrolyte, and lanthanum strontium manganite cathode. The anodes were extruded using an hydraulic ram extruder. An electrolyte was deposited using a novel technique allowing obtaining a 3-5μm thin and dense YSZ layer. The cathode was deposited by brush painting. The cells were operated under different temperature and fuel conditions, and showed excellent performance of up approximately 0.6Wcm−2 at 890°C. Performance data as well as scanning electron microscopy micrographs of the cells are presented.

Sign in / Sign up

Export Citation Format

Share Document