Chemical Purification

Nilsen, Kevin J.; Weimer, Alan W.

doi:10.1007/978-94-009-0071-4_19

Cited by 2 publications

(4 citation statements)

References 24 publications

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“…Removing excess carbon was not considered in this study because excess carbon can assist in achieving full density during sintering by removing oxide impurities and to obtain smaller grain sizes 24–28 . If it is later determined that removal of some, or all, of the carbon would be beneficial for sintering, there are techniques available to do so 29 …”

Section: Methodsmentioning

confidence: 99%

“…[24][25][26][27][28] If it is later determined that removal of some, or all, of the carbon would be beneficial for sintering, there are techniques available to do so. 29 Powder X-ray diffraction (XRD) was performed on a Siemens D5000 instrument (Siemens, New York, NY) by scanning from 201 to 801 2y using a step size of 0.041 2y and a dwell time of 15 s after dispersing the powders on a zero-background holder. Jade 8 software was used to determine phase purity, the compound stoichiometry, and the crystallite size of the samples.…”

Section: Methodsmentioning

confidence: 99%

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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: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

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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“…The high-temperature oxidation method, which involves calcination in air at a temperature as high as 600−800 °C, is commonly used to remove residual carbon. 16 Although a high efficiency of carbon removal was recognized for this method, oxidative structural damage and the resultant degradation of properties was pronounced for nonoxide materials. Other methods such as chemical oxidation decarburization and flotation decarburization routes are inadvisible due to their environmental hazards and less effective removal, respectively.…”

Section: ■ Introductionmentioning

confidence: 99%

“…For example, residual carbon may degrade the oxidation resistance of ceramics and impair the luminescent properties of phosphors. The high-temperature oxidation method, which involves calcination in air at a temperature as high as 600–800 °C, is commonly used to remove residual carbon . Although a high efficiency of carbon removal was recognized for this method, oxidative structural damage and the resultant degradation of properties was pronounced for nonoxide materials.…”

Section: Introductionmentioning

confidence: 99%

Damage-Free Removal of Residual Carbon in a Dielectric Barrier Discharge (DBD) Plasma for Carbothermal-Synthesized Materials

Mao

Chen

et al. 2016

Chem. Mater.

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In this work, we demonstrate damage-free removal of residual carbon in a dielectric barrier discharge (DBD) plasma for carbothermal-synthesized materials, such as CaAlSiN3:Eu2+ phosphors, SnSb alloy anode materials, and TiN ceramic powders. The efficiency of residual carbon removal and the damaging effects of the plasma for treated materials are investigated in detail, with carbothermal-synthesized CaAlSiN3:Eu2+ phosphors being used as an example. Results show that the residual carbon in carbothermal-synthesized CaAlSiN3:Eu2+ phosphors could be removed effectively within a DBD plasma generator, resulting in the significant improvement of luminescent properties. The damage-free character of this DBD plasma decarburization process to phosphors is revealed, showing amazing superiority over the traditional high-temperature decarburization route. These results offer an attractive strategy for the removal of residual carbon for various carbothermal-synthesized materials with finely controlled compositions.

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Chemical Purification

Cited by 2 publications

References 24 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

Damage-Free Removal of Residual Carbon in a Dielectric Barrier Discharge (DBD) Plasma for Carbothermal-Synthesized Materials

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