scholarly journals Phase formation and performance of solid state reactive sintered Ce0.8Gd0.2O2−δ - FeCo2O4 composites

2021 ◽  
Author(s):  
Liudmila Fischer ◽  
Kerstin Neuhaus ◽  
Christina Schmidt ◽  
Ke Ran ◽  
Patrick Behr ◽  
...  
Keyword(s):  
Solid State ◽  
Phase Formation ◽  
Oxygen Transport ◽  
Raw Materials ◽  
Low Cost ◽  
Promising Method ◽  
Dual Phase ◽  
Reactive Sintering ◽  
And Performance ◽  
Oxygen Transport Membrane

Reactive sintering of dual phase composites for the use as oxygen transport membrane is a promising method enabling lower sintering temperatures as well as low cost raw materials. Ce0.8Gd0.2O2−δ -...

scholarly journals Fabrication and performance of a tubular ceria based oxygen transport membrane on a low cost MgO support

2015 ◽  
Vol 147 ◽  
pp. 422-430 ◽  
Author(s):  
D.K. Ramachandran ◽  
M. Søgaard ◽  
F. Clemens ◽  
J. Gurauskis ◽  
A. Kaiser
Keyword(s):  
Oxygen Transport ◽  
Low Cost ◽  
Mgo Support ◽  
And Performance ◽  
Oxygen Transport Membrane

Microstructure Formation and Performance of Reactive Sintered Titanium Oxycarbide Base Ceramic-Ceramic Composites

2019 ◽  
Vol 799 ◽  
pp. 131-135
Author(s):  
Kristjan Juhani ◽  
Jakob Kübarsepp ◽  
Marek Tarraste ◽  
Jüri Pirso ◽  
Mart Viljus
Keyword(s):  
Phase Formation ◽  
Mechanical Performance ◽  
Aluminium Oxide ◽  
High Energy ◽  
Ceramic Composites ◽  
Oxide Ceramic ◽  
Reactive Sintering ◽  
Attritor Milling ◽  
Different Temperatures ◽  
And Performance

Reactive sintering is a process where synthesis reaction of the ceramic phases is combined with sintering (densification) of the composite. Dense lightweight titanium oxycarbide-aluminium oxide ceramic-ceramic composites were produced from titanium dioxide, carbon black as graphite source and aluminium precursors by high energy attritor milling, followed by reactive sintering. Titanium oxycarbide and aluminium oxide phases were synthesized during reactive sintering in situ. To investigate the microstructure evolution and phase formation, the specimens were sintered at different temperatures (600-1725 °C) in vacuum. Scanning electron microscopy and X-ray diffraction were used to analyze the microstructure and phase formation. Mechanical performance (hardness and fracture toughness) was evaluated.

scholarly journals Solid-state synthesis of NASICON (Na3Zr2Si2PO12) using nanoparticle precursors for optimisation of ionic conductivity

2019 ◽  
Vol 55 (6) ◽  
pp. 2291-2302 ◽  
Author(s):  
A. Jalalian-Khakshour ◽  
C. O. Phillips ◽  
L. Jackson ◽  
T. O. Dunlop ◽  
S. Margadonna ◽  
...  
Keyword(s):  
Particle Size ◽  
Solid State ◽  
Ionic Conductivity ◽  
Raw Materials ◽  
Ionic Conductivities ◽  
Solid State Synthesis ◽  
Powder Particle Size ◽  
Macro Scale ◽  
And Performance ◽  
Microstructure And Performance

Abstract In this work, the effect of varying the size of the precursor raw materials SiO2 and ZrO2 in the solid-state synthesis of NASICON in the form Na3Zr2Si2PO12 was studied. Nanoscale and macro-scale precursor materials were selected for comparison purposes, and a range of sintering times were examined (10, 24 and 40 h) at a temperature of 1230 °C. Na3Zr2Si2PO12 pellets produced from nanopowder precursors were found to produce substantially higher ionic conductivities, with improved morphology and higher density than those produced from larger micron-scaled precursors. The nanoparticle precursors were shown to give a maximum ionic conductivity of 1.16 × 10−3 S cm−1 when sintered at 1230 °C for 40 h, in the higher range of published solid-state Na3Zr2Si2PO12 conductivities. The macro-precursors gave lower ionic conductivity of 0.62 × 10−3 S cm−1 under the same processing conditions. Most current authors do not quote or consider the precursor particle size for solid-state synthesis of Na3Zr2Si2PO12. This study shows the importance of precursor powder particle size in the microstructure and performance of Na3Zr2Si2PO12 during solid-state synthesis and offers a route to improved predictability and consistency of the manufacturing process.

scholarly journals A CO2-stable reduction-tolerant Nd-containing dual phase membrane for oxyfuel CO2 capture

2014 ◽  
Vol 2 (21) ◽  
pp. 7780-7787 ◽  
Author(s):  
Huixia Luo ◽  
Tobias Klande ◽  
Zhengwen Cao ◽  
Fangyi Liang ◽  
Haihui Wang ◽  
...  
Keyword(s):  
Partial Oxidation ◽  
Co2 Capture ◽  
Oxygen Transport ◽  
Synthesis Gas ◽  
Dual Phase ◽  
Membrane Material ◽  
Oxidation Of Methane ◽  
Oxygen Transport Membrane ◽  
Stable Reduction ◽  
Harsh Conditions

We report a novel CO2-stable reduction-tolerant dual-phase oxygen transport membrane 40 wt% Nd0.6Sr0.4FeO3−δ–60 wt% Ce0.9Nd0.1O2−δ. This membrane material shows good reversibility of the oxygen permeation fluxes, good stability in a CO2 atmosphere and under the harsh conditions of partial oxidation of methane to synthesis gas up to 950 °C.

scholarly journals Properties of Foamed Lightweight High-Performance Phosphogypsum-Based Ternary System Binder

2020 ◽  
Vol 10 (18) ◽  
pp. 6222 ◽  
Author(s):  
Girts Bumanis ◽  
Jelizaveta Zorica ◽  
Diana Bajare
Keyword(s):  
Ternary System ◽  
High Performance ◽  
Raw Materials ◽  
Low Cost ◽  
Construction Materials ◽  
Mineralogical Composition ◽  
Point Of View ◽  
Raw Material ◽  
Total Energy Consumption ◽  
And Performance

The potential of phosphogypsum (PG) as secondary raw material in construction industry is high if compared to other raw materials from the point of view of availability, total energy consumption, and CO2 emissions created during material processing. This work investigates a green hydraulic ternary system binder based on waste phosphogypsum (PG) for the development of sustainable high-performance construction materials. Moreover, a simple, reproducible, and low-cost manufacture is followed by reaching PG utilization up to 50 wt.% of the binder. Commercial gypsum plaster was used for comparison. High-performance binder was obtained and on a basis of it foamed lightweight material was developed. Low water-binder ratio mixture compositions were prepared. Binder paste, mortar, and foamed binder were used for sample preparation. Chemical, mineralogical composition and performance of the binder were evaluated. Results indicate that the used waste may be successfully employed to produce high-performance binder pastes and even mortars with a compression strength up to 90 MPa. With the use of foaming agent, lightweight (370–700 kg/m3) foam concrete was produced with a thermal conductivity from 0.086 to 0.153 W/mK. Water tightness (softening coefficient) of such foamed material was 0.5–0.64. Proposed approach represents a viable solution to reduce the environmental footprint associated with waste disposal.

scholarly journals Micro-Structure Determines the Intrinsic Property Difference of Bio-Based Nitrogen-Doped Porous Carbon—A Case Study

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1765
Author(s):  
Yingfang Jiang ◽  
Yanxia Liu ◽  
Yagang Zhang ◽  
Yidan Chen ◽  
Xingjie Zan
Keyword(s):  
Porous Carbon ◽  
Carbon Materials ◽  
Raw Materials ◽  
Low Cost ◽  
Synthesis Method ◽  
Intrinsic Property ◽  
Nitrogen Doped ◽  
Surface Areas ◽  
Cottonseed Hull ◽  
And Performance

Biomass-derived porous carbon materials have drawn considerable attention due to their natural abundance and low cost. In this work, nitrogen-doped porous carbons with high nitrogen content and large surface areas were designed and prepared from cottonseed hull and cattail. The two plant-based biomass compositions are similar, but the structures are very different, generating distinctly different property and performance of the prepared carbon materials. NRPC-112 has good electrochemical properties, while CN800 has good adsorption properties. By comparing the microstructure differences between the two starting materials, it was found that the structure of the raw materials would significantly affect the properties and performance of the materials. The work provided an important theoretical basis and reference for the selection of bio-resources for preparing carbon material. It is also important for choosing the appropriate synthesis method, process optimization, and application scenarios.

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