Formation of TiB2 by volume combustion and mechanochemical process

Bilgi, Eda; Çamurlu, H. Erdem; Akgün, Barış; Topkaya, Yavuz; Sevinç, Naci

doi:10.1016/j.materresbull.2007.05.001

Cited by 44 publications

(42 citation statements)

References 20 publications

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“…Most of the studies have been focused on preparation of TiB 2 or TiB 2 containing composites [6][7][8][9][10][11][12]. Molybdenum borides have been used as hard coating materials for high temperature structural applications, and also in the form of MoB/CoCr cermet coatings [1,2,13].…”

Section: Introductionmentioning

confidence: 99%

Preparation of single phase molybdenum boride

Çamurlu

2011

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Preparation of single phase molybdenum boride

Çamurlu

2011

Journal of Alloys and Compounds

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“…Fig. 1-a 4 Cl is 338 and 520°C respectively, though only in this range it can operate as a diluent and cannot control the process. It seems that the addition of NH 4 Cl encourages the formation of Mg 3 B 2 O 6 phase.…”

Section: Methodsmentioning

confidence: 99%

“…As mentioned by Chaichana et al 7 the melted NaCl that remain in the system during the SHS reaction may play an important role by coating on the nucleated TiB 2 particles that could reduce their growth and finally decrease the particle sizes. Fig 1-d shows the SEM micrograph of the sample processed with addition of 1 mole NH 4 Cl. Approximately uniform structure with agglomerated particles was observed.…”

Section: Methodsmentioning

confidence: 99%

“…It is widely used as cutting tool composites, wear resistance parts, metal melting crucibles, electrode materials and cathodes for electro-chemical processing of aluminum (Hall-Heroults process). [1][2][3][4] TiB 2 can be synthesized by different methods such as carbothermic/borothermic reduction of mixed oxides of titanium oxide with boron carbide, solid state reduction of TiCl 4 , Mg and MgB 2 , ball milling and self-propagating high-temperature synthesis (SHS) followed by acid leaching technique. [4][5][6][7][8] The SHS method is a form of controlled combustion synthesis which is a simple method for preparation of advanced ceramics and composites.…”

Section: Introductionmentioning

confidence: 99%

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EFFECTS OF PROCESS CONTROL AGENT ADDITION IN PROCESSING OF NANO-CRYSTALLINE TiB₂ VIA SHS METHOD

Nozari

Ataie

Heshmati-Manesh

2012

Int. J. Mod. Phys. Conf. Ser.

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Nano-crystalline titanium diboride (TiB2) was prepared by self-propagating high-temperature synthesis through putting a hot filament on top of the compact mixture of TiO2, H3BO3 and Mg with a stoichiometric ratio. Effects of the addition of various chloride salts e.g. NaClO4 and NH4Cl as process control agents on phase evolution and chemical analysis and the morphology of the products were investigated by XRD and SEM techniques, respectively. Analysis of the X-ray diffraction patterns confirmed the formation of TiB2 together with some intermediate phases such as Mg3B2O6 and Mg2TiO4 in as synthesized powder. MgO phase was detected as a major phase in the XRD patterns. Nano-crystalline TiB2 became the major phase in some of the leached samples by HCl. The results also showed that the powder particle characteristics were influenced by the addition of the chloride salts.

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“…[3][4] A series of upsetting, bending, rolling and plane strain tests to assess the fracture behaviour of porous materials was carried out. 5 P/M components involving copper are a highly researched composite materials as alloys with copper as one of the constituents will be stronger and durable.…”

Section: Introductionmentioning

confidence: 99%

Workability behaviour of Cu-TiB2 powder-metallurgy preforms during cold upsetting

Gadakary¹,

Khanra²,

Davidson³

2016

Mater. Tehnol.

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An investigation was carried out to find the workability behaviour of a Cu-TiB2 composite under triaxial stress-state conditions. Initially, the TiB2 powder was prepared by using a self-propagating high-temperature synthesis (SHS) technique and the same was added to a Cu matrix in order to make Cu-TiB2 composites. Cylindrical preforms with three different TiB2 weight percentages (2 %, 4 % and 6 %) with aspect ratios of 0.50, 0.75 and 1 were prepared using a uniaxial load. Then the preforms were pressureless sintered in a tubular furnace with a continuous flow of pure argon gas at 950°C for a period of 1 h. The cold upsetting test was carried out on the sintered specimens. The relationships between the various stresses, strains and the relative density were determined. The results for the various stress-ratio parameters, namely (sq/seff) and (sm/seff), the formability stress index (bs) under triaxial stress-state conditions were systematically analysed. The formability stress index was found to increase with the increase in preform fractional density and it decreased with the aspect ratios. This was because the preform contains more pores and the porous bed height is high. A statistical fitting method was performed on the curve drawn between the axial strain and the stress-formability index. The compacts with a higher value of the aspect ratio and the initial preform density showed a very high fracture strain. Keywords: SHS, powder metallurgy, TiB 2 , workability, relative density, fracture strain Izvr{ena je bila preiskava preoblikovalnosti Cu-TiB2 kompozita pri triosnem napetostnem stanju. Najprej je bil pripravljen prah TiB2; s pomo~jo napredujo~e visoko temperaturne sinteze (SHS), ki je bil dodan Cu osnovi, da bi napravili Cu-TiB2 kompozit. Z enoosnim stiskanjem so bili pripravljeni vzorci cilindri~ne oblike s tremi razli~nimi vsebnostmi TiB2 v masnih dele`ih (2 %, 4 % and 6 %) in z razmerjem 0,50, 0,75 in 1. Nato so bile predoblike sintrane v cevasti pe~i pri kontinuirnem pretoku~istega argona na temperaturi 950°C in trajanju 1 h. Kovni preizkus v hladnem je bil izveden na sintranih vzorcih. Ugotovljena je bila odvisnost med razli~nimi napetostmi, raztezki in relativne gostote. Sistemati~no so bili analizirani rezultati razli~nih parametrov (sq/seff) in (sm/seff) ter indeks preoblikovalnih napetosti (bs) pri triosnem napetostnem stanju. Ugotovljeno je, da indeks preoblikovalne napetosti nara{~a z nara{~anjem gostote predoblike in se zmanj{uje z razmerjem {irina-vi{ina. Razlog za to je ve~je {tevilo por v predobliki in zato je vi{ina poroznega vzorca vi{ja. Izvedena je bila tudi statisti~na obdelava krivulje, narisane med osno napetostjo in indeksom preoblikovalne napetosti. Stiskanci z vi{jo vrednostjo razmerja med {irino in vi{ino ter ve~jo gostoto predoblike, so pokazali veliko napetost pri poru{itvi. Klju~ne besede: SHS, metalurgija prahov, TiB2, preoblikovalnost, relativna gostota, napetost pri poru{itvi

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Formation of TiB2 by volume combustion and mechanochemical process

Cited by 44 publications

References 20 publications

Preparation of single phase molybdenum boride

Preparation of single phase molybdenum boride

EFFECTS OF PROCESS CONTROL AGENT ADDITION IN PROCESSING OF NANO-CRYSTALLINE TiB₂ VIA SHS METHOD

Workability behaviour of Cu-TiB2 powder-metallurgy preforms during cold upsetting

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Formation of TiB2 by volume combustion and mechanochemical process

Cited by 44 publications

References 20 publications

Preparation of single phase molybdenum boride

Preparation of single phase molybdenum boride

EFFECTS OF PROCESS CONTROL AGENT ADDITION IN PROCESSING OF NANO-CRYSTALLINE TiB2 VIA SHS METHOD

Workability behaviour of Cu-TiB2 powder-metallurgy preforms during cold upsetting

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EFFECTS OF PROCESS CONTROL AGENT ADDITION IN PROCESSING OF NANO-CRYSTALLINE TiB₂ VIA SHS METHOD