Formation of nanocrystalline niobium carbide (NbC) with a convenient route at low temperature

Ma, Jing; Wu, Min; Du, Yihong; Yang, Keqin; Jin, Wanqin; Fu, Li; Yang, Qiongyao; Wen, Aifei

doi:10.1016/j.jallcom.2008.07.039

Cited by 50 publications

(19 citation statements)

References 18 publications

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“…3(a), corresponds to a reduction in the NbB 2 formation temperature at the same time, based on the reaction in Eq. (5). Although the onset formation temperature of NbB 2 was reported as 1400°C for the Nb 2 O 5 -B 2 O 3 -C powder blend in the FactSage™ graph in Fig.…”

Section: The Effect Of Milling and Annealing On The Reaction Mechanismmentioning

confidence: 92%

“…On the other hand, among transition metal carbides, NbC has received great attention due to its applications in the mechanical, chemical and microelectronics industries [6]. It can find applications in the production of hard materials for reinforcement, in heating elements of electric resistance furnaces and as a catalyst [5]. The superconductivity of NbC was also reported in some studies [7].…”

Section: Introductionmentioning

confidence: 98%

“…NbB 2 exhibits a hexagonal structure with a space group of P6/mmm, in which Nb and B atoms occupy the 1a and 2d positions, respectively [4]. Niobium carbide is a refractory ceramic with promising properties such as a high melting point ($3600°C), high hardness, excellent chemical stability and good wear resistance [5][6][7]. NbC exhibits a cubic structure with a space group of Fm-3m [7].…”

Section: Introductionmentioning

confidence: 99%

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In situ synthesis of NbB2–NbC composite powders by milling-assisted carbothermal reduction of oxide raw materials

Balcı

Ağaoğulları

Ovalı

et al. 2015

Advanced Powder Technology

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Section: The Effect Of Milling and Annealing On The Reaction Mechanismmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In situ synthesis of NbB2–NbC composite powders by milling-assisted carbothermal reduction of oxide raw materials

Balcı

Ağaoğulları

Ovalı

et al. 2015

Advanced Powder Technology

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“…At these temperatures, intensive oxidation of the machined surface is taking place even under intensive coolant flow ( Ref 13). It was shown elsewhere that NbC intensively oxidizes at temperatures above 400°C ( Ref 11,14). The EDS spectrum in Fig.…”

Section: Investigation Of Machined Part: Structure Of Workpiece Matermentioning

confidence: 71%

Microscopic Observations on the Origin of Defects During Machining of Direct Aged (DA) Inconel 718 Superalloy

Dosbaeva

Veldhuis

Elfizy³

et al. 2010

J. of Materi Eng and Perform

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Surface quality of advanced superalloys after machining is one of the major issues in the aerospace industry because it directly affects service characteristics of the machined part. Tool life of cemented carbide inserts with the TiAlN coating during machining of direct aged DA 718 alloys under roughing and finishing conditions has been under study. The defect origin on the surface of the machined part was investigated. Metallographic observations of the DA 718 were made using optical metallography and SEM/EDS. To find out the origins of surface defect formation, the morphology of machined parts and cross sections of the machined surfaces have been investigated. Two major categories of defects were detected on the surface of the machined part: cracks and tears. The origin of the cracks on the machined surface is related to shearing of the primary complex TiC/NbC carbide revealed in a structure of DA 718 alloy. At the same time, Nb-rich regions of the primary complex carbide interact with the environment (oxygen from air) during machining with further formation of low strength oxide layer on the surface, forming tears.

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“…Industrial production of these materials, however, is only possible through highly energetic processes at elevated temperatures (>1300°C) 5 for long residence times (over 6h) 6 , which makes the production of nanoscale products difficult 7 . The development of reaction routes that apply lower temperatures and reaction times, such as the one presented in this paper, could be more interesting economically and industrially, not to mention the gains in materials' properties (nanoscale products, higher superficial area, etc.…”

Section: 2mentioning

confidence: 99%

Synthesis and Characterization of Niobium Carbide with Copper Addition Obtained Via Gas Solid Reaction

et al. 2018

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The use of niobium containing materials' has gained much attention of the scientific community in the late years due its various applications in diverse fields. NbC is a highly versatile material. Copper addition may alter several of its properties, such as morphology, crystal structure etc. as well as enhance its catalytic behavior. Nanostructured NbC with copper addition synthesis' presented here had the precursor [(NH 4 ) 3 [NbO(C 2 O 4 ) 3 ] x H 2 O] as starting material, which was doped with Cu(NO 3 ) 2 at 5% and 10% (molar) ratios. Doped NbC was obtained via gas solid reaction in fixed bed reactor at lower temperature (980°C) and with shorter reaction time (2h) than traditional methods. Reaction products' were characterized by XRD, crystal sizes were estimated according to HWL method, and SEM, XRF, BET and laser particle size analysis were performed. XRD indicated the formation of NbC and Cu phases with cubic crystal structure of ~20nm. SEM showed slight morphological change upon increasing copper content, indicating a less porous structure, which is consistent with BET data (43.7m2 /g for 5%Cu-NbC and 37m 2 /g for the 10% Cu-NbC). Crystal size calculations showed that increasing dopant content particle sizes were also increased, probably due to the presence of the dopant, in some extent, in the crystal structure.

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Formation of nanocrystalline niobium carbide (NbC) with a convenient route at low temperature

Cited by 50 publications

References 18 publications

In situ synthesis of NbB2–NbC composite powders by milling-assisted carbothermal reduction of oxide raw materials

In situ synthesis of NbB2–NbC composite powders by milling-assisted carbothermal reduction of oxide raw materials

Microscopic Observations on the Origin of Defects During Machining of Direct Aged (DA) Inconel 718 Superalloy

Synthesis and Characterization of Niobium Carbide with Copper Addition Obtained Via Gas Solid Reaction

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