Nanocomposites Based on Refractory Compounds, Consolidated by Rate-Controlled and Spark-Plasma Sintering (Review)

Zgalat-Lozinskii, O. B.

doi:10.1007/s11106-014-9583-5

Cited by 15 publications

(15 citation statements)

References 19 publications

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“…New prospects for refractory nanomaterials are related to their outstanding mechanical properties [21], whereas high-temperature applications are limited due to excess grain growth at elevated temperatures [22]. At high temperatures, the nanostructure is unstable and grows up, which leads to deterioration of the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Formation and Properties of the Ta‐Y₂O₃, Ta‐ZrO₂, and Ta‐TaC Nanocomposites

Jakubowicz

Sopata

Adamek

et al. 2018

Advances in Materials Science and Engineering

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e nanocrystalline tantalum-ceramic composites were made using mechanical alloying followed by pulse plasma sintering (PPS). e tantalum acts as a matrix, to which the ceramic reinforced phase in the concentration of 5, 10, 20, and 40 wt.% was introduced. Oxides (Y 2 O 3 and ZrO 2 ) and carbides (TaC) were used as the ceramic phase. e mechanical alloying results in the formation of nanocrystalline grains. e subsequent hot pressing in the mode of PPS results in the consolidation of powders and formation of bulk nanocomposites. All the bulk composites have the average grain size from 40 nm to 100 nm, whereas, for comparison, the bulk nanocrystalline pure tantalum has the average grain size of approximately 170 nm. e ceramic phase refines the grain size in the Ta nanocomposites. e mechanical properties were studied using the nanoindentation tests. e nanocomposites exhibit uniform load-displacement curves indicating good integrity and homogeneity of the samples. Out of the investigated components, the Ta-10 wt.% TaC one has the highest hardness and a very high Young's modulus (1398 HV and 336 GPa, resp.). For the Ta-oxide composites, Ta-20 wt.% Y 2 O 3 has the highest mechanical properties (1165 HV hardness and 231 GPa Young's modulus).

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Section: Introductionmentioning

confidence: 99%

Formation and Properties of the Ta‐Y₂O₃, Ta‐ZrO₂, and Ta‐TaC Nanocomposites

Jakubowicz

Sopata

Adamek

et al. 2018

Advances in Materials Science and Engineering

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“…In general, the nanocrystalline ceramics win in hardness and bend strength, when the so-called "size effect" appears, but lose in fracture toughness compared to coarse grained ceramics. Nanocomposites made with non-oxide ceramic compounds exhibit extremely high hardness and wear resistance, low specific gravity, and maintain mechanical properties at high temperatures without oxidation [1][2][3][4][5][6][7][8][9][10]. Unique properties of Si 3 N 4 -based nanocomposites found an application in novel wear-resistive components, capable to withstand severe operating conditions such as cryogenic and high temperatures, boiling sea water, bases, and acids [1][2][3][4][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Another way to improve tribological properties of Si 3 N 4 -based ceramics is to incorporate TiN particles into the Si 3 N 4 matrix [3,6,10,18]. An addition of TiN into Si 3 N 4 leads to reduction of the friction coefficient from 0.70 down to about 0.50 and stabilisation of the wear coefficients at about 10 À 6 mm 3 /N m level in tribological tests with AISI-52100 steel counterbody [18].…”

Section: Introductionmentioning

confidence: 99%

“…Due to such selflubricating phenomenon, cylindrical rollers made with Si 3 N 4 -TiN composites exhibited enhanced tribological behaviour and 1.5-2 times higher lifespan compared with conventional Si 3 N 4 -based materials [3,6]. Traditionally, Si 3 N 4 -based nanocomposites for wearproof applications are manufactured using high pressure (HP) or spark plasma sintering (SPS) technologies [1][2][3][4]6,13]. These technologies, however, are limited due to strict requirements for the shape of consolidated parts and the necessity of special equipment.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to HP and SPS, RCS could be realized in most conventional furnaces. Fully dense nanoscale ceramics could be fabricated using RCS or multistage sintering profiles without any form factor limitations [5,6].…”

Section: Introductionmentioning

confidence: 99%

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