Investigation of SHS-products in titanium and carbon powder mixtures with excess of titanium content
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Abstract:
The products of self-propagating high-temperature synthesis (SHS) in the reaction mixtures of titanium and carbon (carbon black) containing an excess of titanium content with the purpose of obtaining composite "titanium carbide–titanium binder" powders from the synthesis products were studied by X-ray diffraction analysis, optical and scanning electron microscopy. Based on the results of the investigation of the phase and elemental composition of SHS powders synthesized in argon, the formation of non-stoichiometric titanium carbide has been established which led to a decrease in the content of the titanium binder in composite powders in comparison with the target values. The results of the study of the morphology and structure dependencies of the carbide phase in composite powders on the content of titanium in reactive mixtures have been discussed in conjunction with the results of the determination of the thermo-kinetic characteristics of SHS in the wave combustion mode.Keywords:
Titanium carbide
Titanium powder
Carbon fibers
Stoichiometry
Self-propagating high-temperature synthesis
Self-propagating high-temperature synthesis
Titanium carbide
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Titinium carbide (TiCx) was produced by self-propagating high temperature synthesis (SHS) method. The morphology and non-stoichiometric number of the SHS product were observed by scanning electron microscopy and neutron diffractometry, respectively. Tubular titanium carbide with hole inside was formed with different non-stoichiometric number (x), which value increased with combustion temperature.
Stoichiometry
Self-propagating high-temperature synthesis
Titanium carbide
Morphology
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Stoichiometry
Titanium carbide
Self-propagating high-temperature synthesis
Atmospheric temperature range
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The experimental technique on self-propagating high-temperature synthesis (SHS) of composite titanium carbide and silicon or niobium powders was developed. The synthesis in a mode of burning powder compositions with different percentages of initial reagents was made. The combustion temperature measurement was given. The final products of synthesis were analyzed by electron microscopy and X-ray diffractometry. As is shown SHS products are compositions of ultrafine and nanosized particles of pure target phases TiC-SiC and TiC-NbC, combined into micron size agglomerates.
Self-propagating high-temperature synthesis
Titanium carbide
Agglomerate
Niobium carbide
Titanium powder
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Al₂O₃-TiC composites were prepared from aluminum, titanium oxide, and carbon fibers by self-propagating high-temperature synthesis (SHS). After the SHS reaction, the TiC phase in the sample was found either fibrous or non-fibrous shape. The fraction of the fibrous TiC phase varied with the amount of Al₂O₃ diluent addition. The optimum amount of diluent to make fibrous carbide was determined to be 30%. The fibers were hollow inside and made of multiple grains with a composition of titanium carbide. The hollow fiber formation mechanism was suggested and discussed. The synthesized powders were consolidated to dense composites by hot pressing at 1750℃ under 30 ㎫.
Self-propagating high-temperature synthesis
Titanium carbide
Diluent
Hot pressing
Ceramic matrix composite
Volume fraction
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Self-propagating high-temperature synthesis
Realization (probability)
Titanium carbide
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Titanium carbide
Titanium powder
Powder mixture
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Stoichiometry
Titanium carbide
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Porous titanium carbide (TiC) and TiC/Ti composites were synthesized by self-propagating high-temperature synthesis (SHS). Titanium and carbon powders were blended by various Ti/C blending ratios. The heat of reaction between titanium and carbon was high enough to induce the self-sustaining reaction of TiC formation on condition that some processing parameters (Ti/C ratio and porosity of the precursor) were appropriately selected. When the Ti/C blending ratio was high, the excess amount of titanium absorbed the heat of reaction. Consequently, the heated zone was not heated up to the ignition temperature. On the other hand, when the Ti/C ratio was low, high thermal conductivity of the precursor prevented an ignition of the heated side of precursors. The pore morphology was controlled by changing the Ti/C ratio and the preheat temperature.
Self-propagating high-temperature synthesis
Titanium carbide
Carbon fibers
Autoignition temperature
Titanium powder
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