Influence of TiB2 content on microstructure and hardness of TiB2–B4C composite

Srivatsan, T. S.; Guruprasad, G.; Black, D. E.; Radhakrishnan, R.; Sudarshan, T. S.

doi:10.1016/j.powtec.2005.08.003

Cited by 73 publications

(30 citation statements)

References 20 publications

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“…The partial edges of the B 4 C particles next to TiO 2 were consumed to in situ synthesize TiB 2 . Srivatsan et al [22] also reported that the formation of TiB 2 effectively inhibited the B 4 C grain growth. Figs.…”

Section: Methodsmentioning

confidence: 96%

Microstructure and mechanical properties of B4C-TiB2-Al composites fabricated by vacuum infiltration

Lü

Yue

et al. 2010

Rare Metals

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B 4 C-TiB 2 -Al composites were fabricated by infiltrating aluminum into porous B 4 C-TiB 2 preforms in vacuum. The microstucture and mechanical properties of the B 4 C-TiB 2 -Al composites were investigated. The hardness decreased, the flexural strength increased, and the fracture toughness first increased and then decreased slightly with an increase in TiB 2 content. The B 4 C-TiB 2 -Al composite with 40wt.% TiB 2 showed the optimized properties. The infiltrated aluminum addition was the leading reason for the fracture toughness improvement of the composites. The tear ridges and dimples on the fracture surface of the composites increased gradually with the increase of infiltrated aluminum content showing inter/transgranular fracture mode. The relationships between the microstructures and the mechanical properties of the composites were discussed.

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Section: Methodsmentioning

confidence: 96%

Microstructure and mechanical properties of B4C-TiB2-Al composites fabricated by vacuum infiltration

Lü

Yue

et al. 2010

Rare Metals

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“…Boron carbide (B 4 C) ceramics possesses excellent mechanical and physical properties of good impact and wears resistance, hardness and high melting, excellent resistance to chemical materials as well as high capability for neutron absorption [1][2][3][4][5][6] . Moreover the low density of B 4 C and its high Young's modulus recommend this material for the construction of light-weight armor such as in the helicopter and similar aeroapplication 7 However, the widespread application of B 4 C ceramics has been restricted because of the poor sinterability due to a low self-diffusion coefficient and the low fracture toughness (< 2.2 MPa m 1/2 ) 8,9 .…”

Section: Introductionmentioning

confidence: 99%

The Effect of Calcination Temperature on Synthesis of B4C-Nano Tib2 Composite by Co-Precipitation Method

Khorrami

Baharvandi²,

Lotfi³

2016

Orient. J. Chem

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Titanium diboride is one of the candidate materials for high temperature applications and also for control rod elements in high temperature reactors. This paper presents the experimental data on the composites of B 4 C-nano TiB 2 that were synthesized successfully by co-precipitation method at temperatures between 973 and 1523K. Titanium tetraisopropoxide, boron carbide and isopropanol were used as the precursor materials. The phase constitution and microstructure of B 4 C-nano TiB 2 during synthesis were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to determine phase and microstructure of TiB 2 -B 4 C composites. The DTA/DDTA and TG/ DTG results improve that the first exothermic reaction is TiO 2 phase and second exothermic reaction takes place at 1523K which is TiB 2 phase.

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“…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. [6][7][8] Copper P/M parts are used extensively in both structural and non-structural applications because of the high corrosion resistance, high thermal and electrical conductivity. The corrosion resistance can be further improved by the application of chemical conversion coatings or anodizing treatment.…”

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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Influence of TiB2 content on microstructure and hardness of TiB2–B4C composite

Cited by 73 publications

References 20 publications

Microstructure and mechanical properties of B4C-TiB2-Al composites fabricated by vacuum infiltration

Microstructure and mechanical properties of B4C-TiB2-Al composites fabricated by vacuum infiltration

The Effect of Calcination Temperature on Synthesis of B4C-Nano Tib2 Composite by Co-Precipitation Method

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

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