Oxidation Behavior of TiC/ Fe Ceramics Produced by Self-Propagating High-Temperature Synthesis

2010 ◽  
Vol 434-435 ◽  
pp. 116-119 ◽  
Author(s):  
Bin Li ◽  
Zong De Liu ◽  
Li Ping Zhao ◽  
Yan Rong Bao
Keyword(s):  
High Temperature ◽  
Synthesis Method ◽  
Isothermal Oxidation ◽  
Composite Ceramics ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Oxidation Properties ◽  
Kinetics Of ◽  
Static Pressing

The key problem about the application of TiC/Fe composite ceramics in high temperature is the oxidation resistance. With an aim to investigate oxidation properties, the high density TiC/Fe ceramics was produced by self-propagating high-temperature synthesis method combined with pseudo hot iso-static pressing (SHS/PHIP). The oxidation kinetics of TiC/Fe ceramics were investigated by means of conducting the isothermal oxidation experiments in air at temperature of 550°C  900°C for up to 150 hours, and measuring the variations of the weight gains of the composites with the oxidation times. The microstructure evolution of the composites during the oxidation processing was studied by using SEM/EDS and XRD. Experimental results show that TiC/Fe ceramics basically follows a parabolic rule at high temperature. A detailed characterization of the microstructure and distribution of the phases within the scale following oxidation studies has been undertaken to suggest the possible mechanism for the oxidation of TiC/Fe ceramics.

Synthesis and Characterization of ZrB2-ZrC Composite Powders from Zircon Sand by Self-Propagating High-Temperature Synthesis Method

2018 ◽  
Vol 934 ◽  
pp. 66-70
Author(s):  
Singsarothai Saowanee ◽  
Niyomwas Sutham ◽  
Tawat Chanadee
Keyword(s):  
High Temperature ◽  
Synthesis Method ◽  
Equilibrium Composition ◽  
X Ray Diffraction ◽  
Composite Powders ◽  
Temperature Synthesis ◽  
X Ray ◽  
High Temperature Synthesis ◽  
Zircon Sand

ZrB2-ZrC composite powders were synthesized from zircon sand by self-propagating high-temperature synthesis (SHS). The reactions were verified and the feasibility of obtaining the predicted products was calculated from the adiabatic temperature (Tad) and the equilibrium composition using the HSC®chemistry program. The results show that the SHS products consisted of ZrB2, ZrC, ZrO2, ZrSiO4, MgO, and Mg2SiO4. Leaching the products with 0.5 M of HCl solution eliminated the by-product of MgO and the intermediate Mg2SiO4phases. The phase composition of the products was characterized by X-ray diffraction (XRD) and the morphologies were characterized by scanning electron microscopy (SEM) coupled with energy-dispersive X-ray (EDX).

scholarly journals Multianvil High-Pressure/High-Temperature Synthesis and Characterization of multiferroic HP-Co3TeO6

2021 ◽  
Author(s):  
Gunter Heymann ◽  
Elisabeth Selb ◽  
Toni Buttlar ◽  
Oliver Janka ◽  
Martina Tribus ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Type Structure ◽  
Synthesis And Characterization ◽  
Temperature Synthesis ◽  
Space Group ◽  
Crystal System ◽  
High Temperature Synthesis ◽  
High Pressure High Temperature

By high-pressure/high-temperature multianvil synthesis a new high-pressure (HP) phase of Co3TeO6 was obtained. The compound crystallizes in the acentric trigonal crystal system of the Ni3TeO6-type structure with space group R3...

Self-propagating high-temperature synthesis microalloying of MoSi2 with Nb and V

2003 ◽  
Vol 18 (8) ◽  
pp. 1842-1848 ◽  
Author(s):  
F. Maglia ◽  
C. Milanese ◽  
U. Anselmi-Tamburini ◽  
Z. A. Munir
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Tetragonal Phase ◽  
Synthesis Method ◽  
The Self ◽  
Alloying Elements ◽  
Alloying Element ◽  
Temperature Synthesis ◽  
Starting Mixture ◽  
High Temperature Synthesis

Microalloying of MoSi2 to form Mo(1−x)MexSi2 (Me = Nb or V) was investigated by the self-propagating high-temperature synthesis method. With alloying element contents up to 5 at.%, a homogeneous C11b solid solution was obtained. For higher contents of alloying elements, the product contained both the C11b and the hexagonal C40 phases. The relative amount of the C40 phase increases with an increase in the content of alloying metals in the starting mixture. The alloying element content in the hexagonal C40 Mo(1−x)MexSi2 phase was nearly constant at a level of about 12 at.% for all starting compositions. In contrast, the content of the alloying elements in the tetragonal phase is considerably lower (around 4 at.%) and increases slightly as the Me content in the starting mixture is increased.

High-temperature synthesis and characterization of boron suboxide (B6O) and boron containing hard materials

2019 ◽  
Vol 16 ◽  
pp. 95-101
Author(s):  
Jelena Maletaškić ◽  
Jelena Luković ◽  
Katsumi Yoshida ◽  
Toyohiko Yano ◽  
Ryosuke S.S. Maki ◽  
...  
Keyword(s):  
High Temperature ◽  
Synthesis And Characterization ◽  
Temperature Synthesis ◽  
Hard Materials ◽  
High Temperature Synthesis ◽  
Boron Suboxide

Immobilization of Radioactive Wastes into Perovskite Synrock by the SHS Method

2005 ◽  
Vol 475-479 ◽  
pp. 1627-1630 ◽  
Author(s):  
Rui Zhu Zhang ◽  
Zhi Meng Guo ◽  
Cheng Chang Jia ◽  
Guangfeng Lu
Keyword(s):  
High Temperature ◽  
Synthesis Process ◽  
Temperature Synthesis ◽  
Geological Disposal ◽  
Major Phase ◽  
Leach Rate ◽  
High Temperature Synthesis ◽  
Waste Loading ◽  
Shs Method

This paper researched the fabrication of perovskite synrock by self-propagating high temperature synthesis (SHS) and the characterization of the products. This synthesis process is simpler, the fabricated synrock can immobilize waste loading up to 35wt% SrO with satisfied physical properties (density>4.2g•cm-3, open porosity<0.2%, Leach rate<1.0 g•m-2•d-1). The structure analyses by XRD and SEM/EDS show that the major phase is perovskite which well agrees with the design. It proves that SHS offer a suitable Sr-waste synroc which is favorable for geological disposal.

scholarly journals Direct observation of the formation and stabilization of metallic nanoparticles on carbon supports

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhennan Huang ◽  
Yonggang Yao ◽  
Zhenqian Pang ◽  
Yifei Yuan ◽  
Tangyuan Li ◽  
...  
Keyword(s):  
High Temperature ◽  
Metallic Nanoparticles ◽  
Synthesis Method ◽  
Md Simulations ◽  
Graphite Substrate ◽  
Carbon Supports ◽  
Temperature Synthesis ◽  
Excellent Thermal Stability ◽  
High Temperature Synthesis ◽  
Underlying Mechanisms

AbstractDirect formation of ultra-small nanoparticles on carbon supports by rapid high temperature synthesis method offers new opportunities for scalable nanomanufacturing and the synthesis of stable multi-elemental nanoparticles. However, the underlying mechanisms affecting the dispersion and stability of nanoparticles on the supports during high temperature processing remain enigmatic. In this work, we report the observation of metallic nanoparticles formation and stabilization on carbon supports through in situ Joule heating method. We find that the formation of metallic nanoparticles is associated with the simultaneous phase transition of amorphous carbon to a highly defective turbostratic graphite (T-graphite). Molecular dynamic (MD) simulations suggest that the defective T-graphite provide numerous nucleation sites for the nanoparticles to form. Furthermore, the nanoparticles partially intercalate and take root on edge planes, leading to high binding energy on support. This interaction between nanoparticles and T-graphite substrate strengthens the anchoring and provides excellent thermal stability to the nanoparticles. These findings provide mechanistic understanding of rapid high temperature synthesis of metal nanoparticles on carbon supports and the origin of their stability.

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