Spark plasma sintering of tantalum carbide

Khaleghi, Evan; Lin, Yu-Hsin; Meyers, Marc A.; Olevsky, Eugene A.

doi:10.1016/j.scriptamat.2010.06.006

Cited by 119 publications

(46 citation statements)

References 5 publications

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“…However, the strengths reported for TaC 1Àx are typically lower than theoretical (100-500 MPa) [5,16,[20][21][22][23][24][25][26], an effect that is well understood for brittle materials and related to pre-existing flaws in the material. Pores are a dominant type of flaw in TaC 1Àx , a consequence of the difficulty in producing dense samples [6,7,22,25,[27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of pore formation in high-temperature carbides: Case study of TaC prepared by spark plasma sintering

Kelly

Graeve

2015

Acta Materialia

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Section: Introductionmentioning

confidence: 99%

Mechanisms of pore formation in high-temperature carbides: Case study of TaC prepared by spark plasma sintering

Kelly

Graeve

2015

Acta Materialia

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“…Both of H and E are lower than published values for fully dense TaC ceramic material. The porosity degree of 11% for the TaC ceramic layer in this experiment could explain this deference ( Ref 1,22).…”

Section: Resultsmentioning

confidence: 64%

Evaluation of Fracture Toughness of Tantalum Carbide Ceramic Layer: A Vickers Indentation Method

Song

Zhao

et al. 2016

J. of Materi Eng and Perform

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A tantalum carbide (TaC) ceramic layer was produced on gray cast iron matrix by in situ technique comprising a casting process and a subsequent heat treatment at 1135°C for 45 min. Indentation fracture toughness in TaC ceramic layer was determined by the Vickers indentation test for various loads. A Niihara approach was chosen to assess the fracture toughness of TaC ceramic layer under condition of the Palmqvist mode in the experiment. The results reveal that K IC evaluation of TaC ceramic layer by the Vickers indentation method strongly depends on the selection of crack system and K IC equations. The critical indentation load for Vickers crack initiation in TaC ceramic layer lies between 1 and 2 N and the cracks show typical intergranular fracture characteristics. Indentation fracture toughness calculated by the indentation method is independent of the indentation load on the specimen. The fracture toughness of TaC ceramic layer is 6.63 ± 0.34 MPa m 1/2 , and the toughening mechanism is mainly crack deflection.

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“…Diamond circle 1A1 with AC4 80/63 grain was used as counter-body. Mechanical properties of obtained specimens were determined on P-5 (R-5) research machine by TRS method of determining strength limit [10].…”

Section: Object and Methods Of Studiesmentioning

confidence: 99%

Plasma methods of obtainment of multifunctional composite materials, dispersion-hardened by nanoparticles

Sizonenko¹,

Grigoryev

Zaichenko³

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract.The new approach in developed plasma methods consists in that dispersionhardening additives (TiC, TiB 2 in particular) are not mechanically added to powder mixture as additional component, as in conventional methods, but are instead synthesized during high voltage electric discharges (HVED) in disperse system "hydrocarbon liquid -powder"; preservation of ultrafine structure is ensured due to use of spark plasma sintering (SPS) as a consolidation method. HVED in disperse system "hydrocarbon liquid -powder" due to impact of plasma discharge channel, electromagnetic fields, shock waves mechanical impact, hydro flows and volume microcavitation leads to synthesis of nanocarbon, metal powders dispersion and synthesis of micro-(from 10 -6 to 10 -7 m) and nanosized (from 10 -7 to 10 -9 m) composite powders of hardening phases. SPS is the passage of pulsed current (superposition of direct and alternating current) through powder with the simultaneous mechanical compressing. The formation of plasma is initiated in gaseous phase that fills gaps between particles. SPS allows targeted control of grain growth rate and thus allows obtainment of multifunctional composite materials dispersion hardened by nanoparticles. Processes of HVED synthesis of micro-and nanosized powders of new compositions from elemental metal powders and their mixtures with the subsequent application of high-speed SPS of obtained powders create conditions for increase of strength (by 10 -20 %), hardness and wear-resistance (by 30 -60 %) of obtained materials. IntroductionNuclear energetics is one of the most dynamic sectors of the world economy. Each new generation of nuclear plants becomes more efficient and safe, but demands the use of materials that have high strength, wear-resistance and are capable of working in aggressive environments. Thus, development of construction materials for nuclear plants is important scientific and technical task.Creation of heterogeneous structure in material, which is a plastic matrix with hard inclusions, is a necessary condition to ensure materials strength and wear-resistance. Heterogeneous materials include metal-matrix composites of Fe -Ti -C system, obtained with methods of powder metallurgy. These materials have high strength, hardness, their wear resistance is close to tungsten-containing alloys and their modification by boron carbide leads to increase in corrosion and radiation resistance [1].

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Spark plasma sintering of tantalum carbide

Cited by 119 publications

References 5 publications

Mechanisms of pore formation in high-temperature carbides: Case study of TaC prepared by spark plasma sintering

Mechanisms of pore formation in high-temperature carbides: Case study of TaC prepared by spark plasma sintering

Evaluation of Fracture Toughness of Tantalum Carbide Ceramic Layer: A Vickers Indentation Method

Plasma methods of obtainment of multifunctional composite materials, dispersion-hardened by nanoparticles

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