Fabrication of ultrafine TaC powders by mechano-chemical process

Kwon, Do Hoon; Hong, Seong‐Hyeon; Kim, Byoung-Kee

doi:10.1016/j.matlet.2004.07.038

Cited by 22 publications

(13 citation statements)

References 8 publications

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“…Therefore, the synthesis of fine tantalum carbide powders is of interest. Methodologies for the synthesis of this material include carbothermal reduction and subsequent carburization, impulse plasma synthesis in a liquid, gas‐phase condensation, solvothermal synthesis, mechano‐chemical synthesis, alkalide reduction, organometallic reactions, metathesis reactions, solid‐state reactions, synthesis in ionic/electronic melts, and electrosynthesis 9–21 . Variations of these techniques include the use of elements, compounds, or polymeric precursors as raw materials and the use of microwaves or electric fields to promote the reaction.…”

Section: Introductionmentioning

confidence: 99%

Statistical Experimental Design Approach for the Solvothermal Synthesis of Nanostructured Tantalum Carbide Powders

Kelly

Graeve

2011

Journal of the American Ceramic Society

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We report on the preparation of tantalum carbide nanopowders via a modified solvothermal synthesis route by using experimental design principles. The reaction proceeds by self‐propagating behavior in a molten metal after thermal‐ignition of tantalum chloride, carbon, and a metal reductant. A 4 × 4 × 3 experimental design matrix was performed, without replication, to observe the effects of carbon stoichiometry, reductant stoichiometry, and reductant type on process response variables concerning phase purity, compound stoichiometry, crystallite size, particle size, and surface characteristics. Statistical verifications of the observed effects were performed using a 2 × 2 × 2 experimental design matrix with replication. Eleven conditions resulted in phase‐pure tantalum carbide, with an additional four nonoxide conditions with low secondary‐phase content. The stoichiometry (x in TaCx) ranged from 0.92 to 0.96, the average crystallite size ranged from 24 to 68 nm, the specific surface area ranged from 25 to 66 m2/g, and the average particle size ranged from 93 to 123 nm, indicating a low level of agglomeration.

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Section: Introductionmentioning

confidence: 99%

Statistical Experimental Design Approach for the Solvothermal Synthesis of Nanostructured Tantalum Carbide Powders

Kelly

Graeve

2011

Journal of the American Ceramic Society

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“…T ransition metal carbides, such as tantalum carbide, are some of the most refractory ceramics known (having melting temperatures up to ∼4000 K). Besides being refractory, other beneficial properties include thermomechanical stability, thermochemical stability, corrosion and wear resistance, good creep and fatigue resistance, unique optical and electronic properties, high emissivity at elevated temperatures, and catalytic characteristics 1–8 . These materials are of particular interest in the aerospace industry, where reentry conditions and internal rocket conditions result in harsh environments with demanding specifications.…”

Section: Introductionmentioning

confidence: 99%

A Solvothermal Approach for the Preparation of Nanostructured Carbide and Boride Ultra‐High‐Temperature Ceramics

Kelly

Kanakala

Graeve

2010

Journal of the American Ceramic Society

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The use of a solvothermal process for the synthesis of tantalum carbide (TaC) and lanthanum hexaboride (LaB6) powders in fused‐quartz test tubes is reported in order to demonstrate the synthesis of these powders using thermal and chemical ignition techniques and to prove that the process is of a self‐propagating high‐temperature synthesis type, obviating the need for an autoclave. X‐ray powder diffraction showed phase pure powders with crystallite sizes of 25 and ∼80 nm, while dynamic light scattering showed average particle sizes of 97 and ∼130 nm, for TaC and LaB6, respectively. The data demonstrates that the powders have a very low level of agglomeration. Scanning electron microscopy shows that the TaC powders have a spherical morphology, while the LaB6 powders have a mixture of cubic and spherical morphologies.

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“…For this reason, within a wide range of applications, especially in the transport industry, they are being exploited commonly [6][7][8][9]. However, aluminium alloys exhibit weak tribological characteristics which lead to reduction of their use in many other applications [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Aluminium surface treatment with ceramic phases using diode laser

et al. 2016

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Ceramic particles powder feeding into surface layer of engineering metal alloy is a well-known and widely used technique. New approach into the topic is to obtain finely distributed nano-sized particles involved in the aluminium matrix using the traditional laser technology. In this paper are presented results of microstructure investigation of cast aluminium-silicon-copper alloys surface layer after heat treatment and alloying with ceramic carbides of WC and ZrO 2 using high-power diode laser. The surface layer was specially prepared for the reason of reducing the reflectivity, which is the main problem in the up-to-date metal matrix composites production. With scanning electron microscopy, it was possible to determine the deformation process and distribution of WC and ZrO 2 ceramic powder phase. Structure of the surface after laser treatment changes, revealing three zones-remelting zone, heat-affected zone and transition zone placed over the Al substrate. The structural changes of ceramic powder, its distribution and morphology as well as microstructure of the matrix material influence on functional properties, especially wear resistance and hardness of the achieved layer, were investigated.

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Fabrication of ultrafine TaC powders by mechano-chemical process

Cited by 22 publications

References 8 publications

Statistical Experimental Design Approach for the Solvothermal Synthesis of Nanostructured Tantalum Carbide Powders

Statistical Experimental Design Approach for the Solvothermal Synthesis of Nanostructured Tantalum Carbide Powders

A Solvothermal Approach for the Preparation of Nanostructured Carbide and Boride Ultra‐High‐Temperature Ceramics

Aluminium surface treatment with ceramic phases using diode laser

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