Self-propagating high-temperature synthesis with post-heat treatment of La1−xSrxFeO3 (x=0–1) perovskite as catalyst for soot combustion

2009 ◽  
Vol 470 (1-2) ◽  
pp. 245-249 ◽  
Author(s):  
T. Hirano ◽  
T. Tosho ◽  
T. Watanabe ◽  
T. Akiyama
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Soot Combustion ◽  
Post Heat Treatment ◽  
Temperature Synthesis ◽  
High Temperature Synthesis

Composite materials based on Al2O3‒SiC‒TiB2 obtained by SHS extrusion and their hightemperature annealing

2021 ◽  
pp. 51-55
Author(s):  
A. P. Chizhikov ◽  
A. S. Konstantinov ◽  
M. S. Antipov ◽  
P. M. Bazhin ◽  
A. M. Stolin
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Pressing Pressure ◽  
Technological Parameters ◽  
Temperature Synthesis ◽  
Shs Extrusion ◽  
High Temperature Synthesis ◽  
Before And After

As a result of the combination of the processes of selfpropagating high-temperature synthesis (SHS) and shear high-temperature deformation, realized in the method of SHS-extrusion, ceramic rods based on Al2O3‒SiC‒TiB2 were obtained. The influence of technological parameters of the process (delay time, pressing pressure) on the length of the obtained rods has been studied. The obtained materials were annealed in the range 1000‒1300 °C, and the microstructure and phase composition of the materials were studied before and after heat treatment.

Solid Phase’s Transformations in Boron Carbide Based Composites during Heat Treatment

2008 ◽  
Vol 138 ◽  
pp. 175-180
Author(s):  
Lembit A. Kommel ◽  
Eduard Kimmari
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Boron Carbide ◽  
Environmental Conditions ◽  
Sliding Wear ◽  
Bending Strength ◽  
Reaction Products ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Different Temperatures

Lightweight B4C/Al composites were produced from powders of boron carbide and aluminum by self-propagating high-temperature synthesis (SHS). The effects of postdensification heat treatment at different temperatures and environmental conditions on phase transformations and properties evolution were studied. Heat treatment processing that followed the synthesis was applied using low heating rate in temperature range from 400°C up to 1500°C. An interconnected multiphase (B4C, Al3BC, and c-BN) microstructure was produced in composite as a result of heat treatment at temperatures below 1080°C. The formation of hard and brittle reaction products (AlN, AlB2, Al4C3, and Al8B4C7) at temperatures above 1150°C causes decrease in bending strength and increase in resistance to unlubricated sliding wear.

Self-propagating High-temperature Synthesis of La1−xSrxMnyFe1−yO3 Perovskites for Soot Combustion Catalyst

2012 ◽  
Vol 31 (4-5) ◽  
pp. 513-518
Author(s):  
T. Hirano ◽  
T. Tosho ◽  
T. Watanabe ◽  
T. Akiyama
Keyword(s):  
High Temperature ◽  
Specific Area ◽  
Oxide Phase ◽  
Xrd Analysis ◽  
Soot Combustion ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Dta Analysis ◽  
Perovskite Type ◽  
Shs Method

AbstractThe La1−xSrxMnyFe1−yO3 samples of perovskite-type oxides were synthesized by Self-propagating High-temperature Synthesis (SHS) method. In this study, first, we synthesized B-site substituted perovskite-type oxides, LaMnxFe1−xO3. The SHS method successfully synthesized LaMnxFe1−xO3. The most active composition for soot combustion among synthesized samples of LaMnxFe1−xO3 was x = 0.4, LaMn0.4Fe0.6O3, from model-soot combustion experiment with TG/DTA analysis. We then examined the effect of A-site substitution by Sr on LaMn0.4Fe0.6O3 perovskite. The SHS of La1−xSrxMn0.4Fe0.6O3 was successfully ignited, propagated and completed. XRD peaks of perovskite-type oxide phase was detected in all the synthesized La1−xSrxMn0.4Fe0.6O3 but unreacted material, SrCO3, was also detected in the sample above x = 0.6 from XRD analysis. The soot combustion activity of Sr-doped LaMn0.4Fe0.6O3 was not enhanced according to the impurity in the samples. The most active composition among synthesized samples of La1−xSrxMnyFe1−yO3 was LaMn0.4Fe0.6O3 which exhibited lower activation energy than conventional Pt/Al2O3 catalyst, that is, LaMn0.4Fe0.6O3 synthesized by SHS method had superior soot combustion activity despite its relatively small specific area.

scholarly journals Effect of Cu addition and heat treatment self-propagating high temperature synthesis reaction in Al-Ti-C system

2008 ◽  
Vol 40 (2) ◽  
pp. 207-214 ◽  
Author(s):  
Y.X. Li ◽  
J. Hu ◽  
Y.H. Liu ◽  
Z.X. Guo
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Combustion Temperature ◽  
The Self ◽  
Synthesis Reaction ◽  
Reaction Products ◽  
Temperature Synthesis ◽  
Rigid Framework ◽  
High Temperature Synthesis ◽  
Al2cu Phase

Effect of Cu addition and heat treatment on the self-propagating high temperature synthesis reaction have been investigated. The results show that Cu reacts with Al to form Al2Cu phase. With the addition of Cu, the combustion temperature of the system decreases and the porosity of the products is reduced, the size of TiC particulate decreases in the SHS reaction products. Specially, when heat treatment is carried out for the sintering products at 800 ?C, the rigid framework (sintering neck) between TiC particles was formed.

scholarly journals Effect of New Superhard Phases Formation on Properties of Composite Processed by SHS

2012 ◽  
Vol 527 ◽  
pp. 137-142 ◽  
Author(s):  
Lembit Kommel ◽  
Toomas Tamm ◽  
Raido Metsvahi
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Friction Coefficient ◽  
Tribological Behavior ◽  
Dry Sliding ◽  
Initial Powder ◽  
Nitrogen Flow ◽  
Gaseous Nitrogen ◽  
Temperature Synthesis ◽  
High Temperature Synthesis

A composite was produced from initial powder mixture of B4C (70 wt.%) and Al (30 wt. %) with WC-Co additives introduced during ball-milling and acting as catalysts by self-propagating high-temperature synthesis and followed by heat treatment of raw samples under gaseous nitrogen flow at 650, 800, 1000, 1150 and 1450 °C, respectively. Formation of different new superhard phases was detected via XRD investigation and analysis of microstructures. Micromechanical properties were tested by nanoindentation. The tribological behavior in dry sliding conditions of the composite was investigated using the ball-on-disk technique against alumina balls. The friction coefficient of the composite increased and wear rate decreased with formation of c-BC2N, c-BN, B13C2, W2B5, Al3BC, AlN, etc. contents during heat treatment at increased temperatures.

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