Factors Affecting the Formation Rate of ZrN by the Carbothermal Nitridation Method

Yamamura, Hiroshi; Emoto, Satoshi; Mori, Toshiyuki

doi:10.2109/jcersj.106.650

Cited by 6 publications

(8 citation statements)

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“…Additionally, the lattice parameter of the product in each sample is in better accordance with that of ZrN than that of ZrC. As shown in Table 4, the lattice parameters exist in a narrow range of 0.4590-0.4595 nm, which are close to the data reported by Yamamura et al 11 but a little larger than the value given by PDF 35-0753.…”

Section: A Thermodynamic Analysis On the Formation Of Zrnsupporting

confidence: 84%

“…By the reduction and nitridation of ZrO 2 in a N 2 or NH 3 atmosphere, ultrafine ZrN powders have also been prepared. 11,12 In this paper, consolidated ZrO 2 ceramics, instead of ZrO 2 powders, are used as the precursor to synthesize ZrN by carbothermal nitridation. Polycrystalline ZrN 1-x C x layers with (111) preferred orientation are prepared at the surface of ZrO 2 ceramics.…”

Section: Introductionmentioning

confidence: 99%

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Polycrystalline ZrN_1-xC_x Layers with (111) Preferred Orientation Prepared by the Carbothermal Nitridation of ZrO₂ Ceramics

Liu

Chen

et al. 2008

Crystal Growth & Design

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Polycrystalline ZrN 1-x C x layers have been prepared by the carbothermal nitridation of consolidated ZrO 2 ceramics. Thermodynamic analysis indicates that the formation of ZrN 1-x C x is favored by increasing the reaction temperature and the pressure of N 2 . The kinetics in the carbothermal nitridation is studied, and the overall reaction is considered to be controlled by the infiltration and diffusion of gaseous reactants. From the surface to the center, the sample shows a porosity gradient due to the difference in reaction degree. A strong (111) preferred orientation is observed in the as-synthesized ZrN 1-x C x layers, which is enhanced at elevated temperatures and higher pressures of N 2 . It is proposed that the growth of ZrN 1-x C x crystals takes place by the two-dimensional nucleation and growth mechanism.

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Section: A Thermodynamic Analysis On the Formation Of Zrnsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Polycrystalline ZrN_1-xC_x Layers with (111) Preferred Orientation Prepared by the Carbothermal Nitridation of ZrO₂ Ceramics

Liu

Chen

et al. 2008

Crystal Growth & Design

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“…The reaction of oxides with graphite (carbothermal process) is widely used for industrial synthesis of bulk carbide powders. Nitrides can also be synthesized from oxides [49] by reaction with nitrogen or ammonia, usually in the presence of carbon (carbothermal nitridation) [26,50]. The traditional preparation routes were reviewed in monographs by Toth [22] and Storms [21].…”

Section: Synthesis Methodsmentioning

confidence: 99%

“…Carbides obtained by carbothermal reaction from oxides are known to retain some oxygen [55]. Nitrides from carbothermal nitridation will contain both oxygen and carbon impurities [50]. Synthesis from metal hydrides is often considered most appropriate for producing pure compounds; however, hydrogen can also be incorporated in rock-salt structure, e.g., formation of the solid solution ZrC 0.67 H 0.33 has been reported [56].…”

Section: Synthesis Methodsmentioning

confidence: 99%

Carbides and Nitrides of Zirconium and Hafnium

et al. 2019

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Among transition metal carbides and nitrides, zirconium, and hafnium compounds are the most stable and have the highest melting temperatures. Here we review published data on phases and phase equilibria in Hf-Zr-C-N-O system, from experiment and ab initio computations with focus on rocksalt Zr and Hf carbides and nitrides, their solid solutions and oxygen solubility limits. The systematic experimental studies on phase equilibria and thermodynamics were performed mainly 40–60 years ago, mostly for binary systems of Zr and Hf with C and N. Since then, synthesis of several oxynitrides was reported in the fluorite-derivative type of structures, of orthorhombic and cubic higher nitrides Zr3N4 and Hf3N4. An ever-increasing stream of data is provided by ab initio computations, and one of the testable predictions is that the rocksalt HfC0.75N0.22 phase would have the highest known melting temperature. Experimental data on melting temperatures of hafnium carbonitrides are absent, but minimum in heat capacity and maximum in hardness were reported for Hf(C,N) solid solutions. New methods, such as electrical pulse heating and laser melting, can fill the gaps in experimental data and validate ab initio predictions.

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“…ZrN powders have been successively synthesized by the carbothermal nitridation method. 3 Yamamura et al 4 have previously investigated the factors affecting the formation rate of ZrN powders in the carbothermal nitridation method. They clarified that an excess amount of carbon was needed for the synthesis of ZrN powders.…”

Section: 2mentioning

confidence: 99%

Synthesis of ZrN Thin Film by a New Carbothermal Nitridation Method of Sol-Gel Derived ZrO2

博

真之

克良

2005

J. Ceram. Soc. Japan

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ZrO 2 gel film was prepared by spin-coating of Zr sol from Zr-n-propoxide, n-propanol, acetylacetone, water and nitric acid, on various substrates such as polycrystalline Al 2 O 3 , and single crystals of Al 2 O 3 , SrTiO 3 , 8 mol! Y 2 O 3 doped ZrO 2 YSZ and MgO. The dried-gel film on Al 2 O 3 substrate was transformed to cubic ZrN single phase with bright gold-color by a new carbothermal nitridation method, in which the thin film was covered with a porous graphite crucible to realize a strong reducing atmosphere was fired in flowing nitrogen gas at a fairly high temperatures above 1673 K. The ZrN thin film thus obtained was characterized by means of X-ray diffractometry XRD , scanning electron microscopy SEM observation, reflection spectra.

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Factors Affecting the Formation Rate of ZrN by the Carbothermal Nitridation Method

Cited by 6 publications

References 1 publication

Polycrystalline ZrN_1-xC_x Layers with (111) Preferred Orientation Prepared by the Carbothermal Nitridation of ZrO₂ Ceramics

Polycrystalline ZrN_1-xC_x Layers with (111) Preferred Orientation Prepared by the Carbothermal Nitridation of ZrO₂ Ceramics

Carbides and Nitrides of Zirconium and Hafnium

Synthesis of ZrN Thin Film by a New Carbothermal Nitridation Method of Sol-Gel Derived ZrO2

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Factors Affecting the Formation Rate of ZrN by the Carbothermal Nitridation Method

Cited by 6 publications

References 1 publication

Polycrystalline ZrN1-xCx Layers with (111) Preferred Orientation Prepared by the Carbothermal Nitridation of ZrO2 Ceramics

Polycrystalline ZrN1-xCx Layers with (111) Preferred Orientation Prepared by the Carbothermal Nitridation of ZrO2 Ceramics

Carbides and Nitrides of Zirconium and Hafnium

Synthesis of ZrN Thin Film by a New Carbothermal Nitridation Method of Sol-Gel Derived ZrO2

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Polycrystalline ZrN_1-xC_x Layers with (111) Preferred Orientation Prepared by the Carbothermal Nitridation of ZrO₂ Ceramics

Polycrystalline ZrN_1-xC_x Layers with (111) Preferred Orientation Prepared by the Carbothermal Nitridation of ZrO₂ Ceramics