Investigations Of Sic Aggregates Oxidation Influence On
Investigations of SiC aggregates oxidation Influence on
Thanks to thermogravimetric and thermal expansion tests kinetics of oxidation of the powder of SiC and of the castables has been investigated According to these tests several important points have been underlined Firstly the oxidation of SiC aggregates has a high influence on the thermal expansion and on the weight gain of SiC castables
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A model for thermal oxidation of Si and SiC including
A model based on drift diffusion reaction kinetics for Si and SiC oxidation is discussed which takes the material expansion into account with an additional convection term The associated velocity field is determined self consistently from the local reaction rate The approach allows a calculation of the densities of volatile species in an nm resolution at the oxidation front
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Influence of Asphaltene Aggregation on the Adsorption and
This study is a continuation of our previous works on the use of metal based nanoparticles for the adsorption of asphaltenes and its subsequent catalytic thermal decomposition In this study we evaluated the effects of asphaltene aggregation on the adsorption process and the subsequent catalytic oxidation using fumed silica and nanoparticles of NiO and/or PdO supported on fumed silica
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PDF Investigations of Oxide/4H SiC Interface State
But using low temperature wet oxidation for a short time cannot provide sufficient oxide thickness Hence a Si 3 N 4 film was in situ deposited after NH 3 POA by LPCVD with SiH 2 Cl 2 and NH 3 as precursors to achieve EOT increment without further oxidizing the SiC substrate
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Influences of novel Si2BC3N antioxidant on the structure
Abstract The ultra low cement bonded Al2O3 SiC C castables were prepared with the introduction of a novel Si2BC3N antioxidant The microstructure evolution and the mechanical properties were evaluated in coke bed and air atmosphere Besides the thermal properties including thermal shock hot modulus of rupture oxidation and refractories under load were comparatively investigated
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Influence of SiC addition on the properties of andalusite
The aim of this study is to determine the properties of fired andalusite brick with silicon carbide addition Brick samples were prepared by mixing shaping drying and sintering at 1300 °C in a commercial tunnel kiln The bulk density apparent porosity gas permeability and cold crushing strength of fired brick samples were determined
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Oxidation Behavior of Silicon CarbideERVIN1958
A Gallet Doncieux O Bahloul C Gault M Huger and T Chotard Investigations of SiC aggregates oxidation Influence on SiC castables refractories life time at high temperature Journal of the European Ceramic Society 32 4 737 2012
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Mass Spectrometric Study of Oxidation of SiC in Low
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Influence of Electrochemical Potentials on the
Further detailed investigations of SiC materials with different well defined doping levels and conducting character p n conductor are necessary to validate this explanation In the case of ring on ring sliding geometries the contact area is rather large 552 mm 2
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Influence of SiC addition on the properties of andalusite
The aim of this study is to determine the properties of fired andalusite brick with silicon carbide addition Brick samples were prepared by mixing shaping drying and sintering at 1300 °C in a commercial tunnel kiln The bulk density apparent porosity gas permeability and cold crushing strength of fired brick samples were determined Slag penetration test was investigated by static cup
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Investigations of SiC aggregates oxidation Influence on
Firstly the oxidation of SiC aggregates has a high influence on the thermal expansion and on the weight gain of SiC castables Secondly the grain size distribution of SiC aggregates within castables plays a dominating role especially enhanced for the fine particles in castable expansion behaviour induced by oxidation
Get PriceInfluence of MoSi 2 on oxidation protective ability of TaB
TaB2 SiC coating modified by different content of MoSi2 was fabricated on graphite substrate with SiC inner coating by liquid phase sintering to elevate the anti oxidation capability of the TaB2 SiC coatings As compared to the sample with the TaB2 40wt SiC coating the coating sample modified with MoSi2 exhibited a weight gain trend at lower temperatures the fastest weight loss rate
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Influence of thermal growth parameters on the SiO2/4H SiC
To achieve these goals different subatmospheric oxygen pressures of 18 O 2 and oxidation times were used to thermally grow thin SiO 2 films on 4H SiC substrates Samples were probed by nuclear reaction analysis NRA to determine the total amount of oxygen incorporated before and after the removal of the Si 18 O 2 film and by NRP to determine its depth distribution
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In the present work the effects of the pre firing temperature of andalusite aggregates 5–3 mm on the conversion of andalusite as well as the volume stability and oxidation resistance of the Al 2 O 3 –SiC–C castables were investigated The phases of the andalusite aggregates were tested via X ray diffraction and their microstructures as well as those of the castables were characterized via scanning
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Investigations of SiC aggregates oxidation Influence on
Firstly the oxidation of SiC aggregates has a high influence on the thermal expansion and on the weight gain of SiC castables Secondly the grain size distribution of SiC aggregates within castables plays a dominating role especially enhanced for the fine particles in castable expansion behaviour induced by oxidation
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Influences of novel Si2BC3N antioxidant on the structure
Si Al and B 4 C are responsible for the low to medium temperature range and their oxidation provide three benefits I firstly they sace themselves in front of carbon species to decrease the P O 2 II the oxidation products SiO 2 Al 2 O 3 and B 2 O 3 could block the voids and suppress the atmosphere exchange III they can also react with carbon containing species under high temperature to form ceramics including SiC
Get PriceInfluences of novel Si2BC3N antioxidant on the structure
Si2BC3N has mainly two effects depending on the treating temperature 1 it protects the carbon from oxidation and increases the structure integrity when the specimens are treated below 1100 °C 2 it stimulates the growth of SiC whiskers under 1400 °C due to the enhanced reaction between SiO and CO
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Oxygen partial pressure dependence of the SiC oxidation
Silicon carbide SiC is an attractive wide bandgap semiconductor because it has superior physical properties suited for low loss and high power devices such as high breakdown field and high thermal conductivity In addition Si oxide layers utilized as insulators in metal oxide semiconductor field effect transistors MOSFETs can be grown on SiC substrate surfaces by thermal oxidation
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Influence of SiC addition on the properties of andalusite
Open pores or channels in the brick with SiC might be blocked by SiO 2 generated by oxidation of silicon carbide during brick production at high temperatures In addition thermal expansion of SiC particles at a high temperature may also block pores in brick and it may decrease open pores and gas penetration After a 5 SiC addition an increase of gas permeability was observed it might be
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Young s modulus evolution at high temperature of SiC
The influence of oxidation of SiC aggregates on elastic properties is also discussed This is a preview of subscription content access via your institution Access options Buy single article Instant access to the full article PDF US 39 95 Tax calculation will be finalised during checkout
Get PriceMechanical performance and oxidation resistance of SiC
Investigations of SiC aggregates oxidation influence on SiC castables refractories life time at high temperature J Eur Ceram Soc 32 4 2012 pp 737743
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Controlled Surface Chemistry of Diamond/β SiC Composite
Diamond and SiC both process extraordinary biocompatible electronic and chemical properties A combination of diamond and SiC may lead to highly stable materials e g for implants or biosensors with excellent sensing properties Here we report on the controllable surface chemistry of diamond/β SiC composite films and its effect on protein adsorption
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Characterization of oxide films on 4H SiC epitaxial 0001
The oxidation rate of the 000 1 ¯ C face is the largest among all hexagonal SiC faces and is approximately ten times larger than that of the SiC 0001 Si face 2 2 A Gölz G Horstmann E Stein von Kamienski and H Kurz Inst Phys Conf Ser 142 633 1996 Hence utilization of the SiC C face can reduce the processing time needed for the production of SiC MOSFETs
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Effect of SiC Addition on Oxidation Behavior of ZrB 2 at
The oxidation behavior of ZrB2–SiC composites with different contents of SiC addition was investigated at 1273 and 1473 K in air for 12 h in this study The SiC addition contents ranged from 0 to 30 wt The results showed that when ZrB2–SiC composites were oxidized at 1273 K in air a two oxide layer structure forms a continuous glassy layer and a ZrO2 layer contained unoxidized SiC
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On the influence of relative humidity on the oxidation and
Modern oil paintings are affected by conservation issues related to the oil paint formulations and to the fact that they are often unvarnished and in direct contact with the environment
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Active Oxidation of SiC SpringerLink
Silicon carbide SiC forms a protective condensed phase oxide SiO2 in passive oxidation and a volatile sub oxide SiO g in active oxidation The transition between these two modes of oxidation and the rates of active oxidation are critical issues A literature review indicates that impurity effects the difference between active to passive and passive to active transitions and the effect
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Corrosion characteristics of silicon carbide and silicon
corrosion because of their influence on the possible reaction sequences the diffusion rates of the reac tants and products and the occurrence of either localized pitting or uniform surface recession 2 1 Oxidation of SiC The oxidation of SiC has been a subject of con
Get PriceInfluence of SiC addition on the properties of andalusite
The effects of SiC additions on the penetration properties of the samples have been investigated The addition of SiC significantly affects the reduction behavior of metallic ingredients in EAF dust recovery on the brick surface SiC shows the self glazing properties
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Thermal Oxidation Mechanism of Silicon Carbide IntechOpen
2 1 Deal Grove model and its related models The kinetic model of Si oxidation that is most often taken as a reference is the one so called Deal Grove model proposed by Deal and Grove 6 12 According to this model the beginning of oxidation is limited to the interfacial oxidation reaction and after oxidation proceeds the rate imiting process is transferred from the interfacial reaction
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Influence of annealing environment on the ALD Al2O3/4H SiC
The instability of Al 2 O 3 /4H SiC interface at various process temperatures and ambient is investigated by the annealing of Al 2 O 3 /4H SiC in low vacuum conditions as well as in N 2 environments Atomic layer deposited Al 2 O 3 on a 4H SiC substrate with 3 6 and 10 nm of thicknesses is treated at 300 500 700 and 900 °C under the vacuum level of 10 −1 torr
Get PriceResearch on Influence of Chloride Ion in Sea Sand on the
Sea sand concrete is a kind of concrete in which mixed sea sand as fine aggregate which is large scale application in the coastal areas in recent years especially in Ningbo area The sea sand solves the problem of river sand shortage coupled with cheaper price most of the ready mixed concrete companies are willing to use desalted sea sand instead of river sand
Get PriceChemistry of reactions proceeding inside molecular aggregates
Influence of Anions and Micelle and Submicellar Aggregates on the Alkaline Hydrolysis of Malachite Green Tensiometric Spectrophotometric and Kinetic Investigations The Journal of Physical Chemistry B 2020 124 10
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Chemistry of reactions proceeding inside molecular aggregates
Influence of Anions and Micelle and Submicellar Aggregates on the Alkaline Hydrolysis of Malachite Green Tensiometric Spectrophotometric and Kinetic Investigations The Journal of Physical Chemistry B 2020 124 10
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behavior of asphalt facings on rock fill dams AFRD
section 1 and Figure 4 results of bitumen investigations values of needle penetrationPEN INDEX in various aging conditions were compared While the influence of aggregates is negligible the crucial part of the aging behavior is caused by bitumen Several investigations have shown that
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Modeling the Effect of Oxidation on the Creep Behavior of
A new model for predicting the creep behavior of SiC/PyC/SiC mini composites under wet oxygen atmosphere 900 1200℃ 1 50 H2O is developed based on the thermal–mechanical environmental micro fiber strength degradation and creep oxidation model The model firstly takes the effects of the catalysis of water vapor the oxidation of matrix and interphase fiber strength
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Corrosion characteristics of silicon carbide and silicon
corrosion because of their influence on the possible reaction sequences the diffusion rates of the reac tants and products and the occurrence of either localized pitting or uniform surface recession 2 1 Oxidation of SiC The oxidation of SiC has been a subject of con
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