Preparation of niobium borides NbB and NbB2 by self-propagating combustion synthesis

Yeh, C.L.; Chen, W.H.

doi:10.1016/j.jallcom.2005.10.031

Cited by 53 publications

(35 citation statements)

References 28 publications

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“…The difference in recorded and theoretical adiabatic temperature appears to be dependent on the composition of the raw material, reaction environment and heat exchange with the surrounding. Similar experimental evidences are reported earlier in the combustion synthesis of silicide, boride and carbide 25,26,33 . The theoretical adiabatic temperature of Ta 2 C, TiSi and NbB 2 are 2600K, 2000K and 2400K, respectively.…”

Section: Combustion Temperaturessupporting

confidence: 90%

“…The theoretical adiabatic temperature of Ta 2 C, TiSi and NbB 2 are 2600K, 2000K and 2400K, respectively. The measured combustion temperatures reported were 1963K 33 , 1603K 25 and 1873K 26 , respectively, which are much lower than their theoretical adiabatic temperature.…”

Section: Combustion Temperaturesmentioning

confidence: 68%

“…The underlying basis of SHS relies on the ability of highly exothermic reactions to be self−sustaining and, therefore, energetically efficient [20][21][22] . Combustion synthesis is an important method to prepare intermetallics compounds like MoSi 2 , Ti−Si and Nb−B [23][24][25][26][27] . However, there is no report in the literature on the combustion synthesis of Mo−Si−Ti alloys.…”

Section: ·Kmentioning

confidence: 99%

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Formation of Mo−Si−Ti Alloys by Self−propagating Combustion Synthesis

Zhu

Feng

et al. 2015

Mat. Res.

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0.6 )Si 2 were prepared by combustion synthesis. The combustion mode, propagation velocity of combustion wave, combustion temperature and product structure were investigated. Specimens MoSi 2 , (Mo 0.9 Ti 0.1 )Si 2 , (Mo 0.8 Ti 0.2 )Si 2 , (Mo 0.7 Ti 0.3 )Si 2 , underwent spontaneously self−propagating combustion synthesis. However, the (Mo 0.6 Ti 0.4 )Si 2 and (Mo 0.5 Ti 0.5 )Si 2 specimens required a sustainable energy supply to complete the combustion synthesis reaction. There was no combustion synthesis reaction in specimen (Mo 0.4 Ti 0.6 )Si 2 . The combustion wave propagated along a spiral trajectory from top to the bottom of the specimen compacts in a layer by layer mode. The propagation velocity of the combustion wave reduced with the addition of titanium. The X-ray diffraction analysis showed that the Cll b -MoSi 2 and C40-(Mo,Ti)Si 2 type phases were formed during combustion synthesis. The intensity of diffraction peaks of C40-(Mo,Ti)Si 2 phase increased with Ti content.

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Section: Combustion Temperaturessupporting

confidence: 90%

Section: Combustion Temperaturesmentioning

confidence: 68%

Section: ·Kmentioning

confidence: 99%

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Formation of Mo−Si−Ti Alloys by Self−propagating Combustion Synthesis

Zhu

Feng

et al. 2015

Mat. Res.

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“…These are due to the presence of hard niobium boride phases such as NbB, NbB 2 and Nb 3 B 4 detected by XRD analysis as shown in Figure 2. This kind of niobium boride phases were also obtained at earlier studies [8][9][10][11][12]. The depth of the niobium boride layers changes between 0.42 μm to 2.43 μm, depending on the treatment temperatures and times as shown in Figure 3.…”

Section: Methodssupporting

confidence: 72%

Niobium boride layers deposition on the surface AISI D2 steel by a duplex treatment

Kon¹,

Pazarlıoğlu²,

Şen³

et al. 2015

AIP Conference Proceedings

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Abstract. In this paper, we investigated the possibility of deposition of niobium boride layers on the surface of AISI D2 steel by a duplex treatment. At the first step of duplex treatment, boronizing was performed on AISI D2 steel samples at 1000 o C for 2h and then pre-boronized samples niobized at 850°C, 900°C and 950 o C using thermo-reactive deposition method for 1-4 h. The presence of the niobium boride layers such as NbB, NbB 2 and Nb 3 B 4 and also iron boride phases such as FeB, Fe 2 B were examined by X-ray diffraction analysis. Scanning electron microscope (SEM) and micro-hardness measurements were realized. Experimental studies showed that the depth of the coating layers increased with increasing temperature and times and also ranged from 0.42 μm to 2.43 μm, depending on treatment time and temperature. The hardness of the niobium boride layer was 2620±180 HV 0.005 .

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“…Borides of niobium are recognized as potential candidates for high-temperature structural applications [1][2][3], due primarily to their excellent properties such as high melting temperature, high strength, high thermal and electrical conductivity, and good chemical stability [4,5]. Six types of binary niobium borides Nb 3 B 2 , NbB, Nb 5 B 6 ,Nb 3 B 4 , NbB 2 and Nb 2 B 3 have been reported.…”

Section: Introductionmentioning

confidence: 99%

Wear behavior of the surface alloyed AISI 1020 steel with Fe-Nb-B by TIG welding technique

Kılınç

Durmaz

Abakay

et al. 2015

AIP Conference Proceedings

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Abstract.Weld overlay coatings also known as hardfacing is a method which involves melting of the alloys and solidification for applied coatings. Recently hardfacing by welding has become a commonly used technique for improvement of material performance in extreme (high temperature, impact/abrasion, erosion, etc.) conditions.In the present study, the coatings were produced from a mixture of ferrous niobium, ferrous boron and iron powders in the ranges of -45 μm particle size with different ratio.

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Preparation of niobium borides NbB and NbB2 by self-propagating combustion synthesis

Cited by 53 publications

References 28 publications

Formation of Mo−Si−Ti Alloys by Self−propagating Combustion Synthesis

Formation of Mo−Si−Ti Alloys by Self−propagating Combustion Synthesis

Niobium boride layers deposition on the surface AISI D2 steel by a duplex treatment

Wear behavior of the surface alloyed AISI 1020 steel with Fe-Nb-B by TIG welding technique

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