Mechanical properties of ZrB2- and HfB2-based ultra-high temperature ceramics fabricated by spark plasma sintering

Zapata-Solvas, Eugenio; Jayaseelan, Daniel Doni; Lin, Hua‐Tay; Brown, Peter M.; Lee, William

doi:10.1016/j.jeurceramsoc.2012.12.009

Cited by 188 publications

(105 citation statements)

References 43 publications

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“…[113] Due to the unique combination of mechanical and physical properties potential applications of UHTC are related with components that work under extreme temperatures conditions, such as thermal protective structures for leading edges on hypersonic flights and during atmosphere exit and re-entry processes on aerospace vehicles, aero propulsion systems, refractory crucibles, and plasma-arc electrodes. [114,115] ZrB 2 and HfB 2 are the most studied and employed UHTC materials, [116,117] although TiB 2 , [118] ZrC, [119] TaC, [120] , and TiN [121] also show interesting properties. Sinterability of UHTC materials is low due to the highcovalent character of atomic bonding, low self-diffusion coefficients, oxygen impurities located on the particle surfaces and the micrometer size of commercial powders.…”

Section: Refractory Metals and Intermetallicsmentioning

confidence: 99%

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

et al. 2014

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Field-assisted sintering technology/Spark plasma sintering is a low voltage, direct current (DC) pulsed current activated, pressure-assisted sintering, and synthesis technique, which has been widely applied for materials processing in the recent years. After a description of its working principles and historical background, mechanical, thermal, electrical effects in FAST/SPS are presented along with the role of atmosphere. A selection of successful materials development including refractory materials, nanocrystalline functional ceramics, graded, and non-equilibrium materials is then discussed. Finally, technological aspects (advanced tool concepts, temperature measurement, finite element simulations) are covered.

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Section: Refractory Metals and Intermetallicsmentioning

confidence: 99%

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

et al. 2014

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“…The increase in K IC was caused not only by the increase of the residual stress, but the increase in the fracture toughness due to reducing the size of the ZrB 2 grains in the ZrB 2 -SiC composites obtained by SPS at sintering temperatures of ~2200 K. Sonber and co-authors [21] [1,6,21]. The calculated normalized compressive strength of ZrB 2 -В 4 С ceramics versus the logarithm of normalized strain rates are shown in Fig.…”

Section: Resultsmentioning

confidence: 98%

“…Zapata-Solvas [6] showed that the use of SPS allowed processing of ZrB 2 -SiC and HfB 2 -SiC composites with higher values of hardness, flexural strength and fracture toughness at room temperature, at 1700 K and 2100 K in comparison with analogs obtained by the HIP fabrication method. For the ZrB 2 -SiC system the flexural strength is increased by addition of second phases such as SiC and La 2 O 3 , from 450 to ~700 MPa and from 500 to ~700 MPa in HfB 2 -based UHTCs.…”

Section: Introductionmentioning

confidence: 99%

Predicting the mechanical properties of ultra-high temperature ceramics

Skripnyak¹,

Skripnyak²

2017

LoM

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A model for predicting mechanical properties of ultra-high temperature ceramics (UHTC) and composites within a wide temperature range is presented. The model can be useful for predicting the mechanical properties of UHTC composites under dynamic loading and thermal shock. Results of calculations taking into account the dependences of the nonlinearity of normalized elastic moduli on the homologous temperature in the range T / T m = 0.2 -0.62 are presented.. Residual stresses in ZrB 2 composites reinforced with particles of refractory borides, carbides and nitrides after selective laser sintering (SLS) or spark plasma sintering (SPS) are predicted. It is shown that the fracture toughness K IC of UHTC increases at the sintering temperature in the range (0.45 -0.62) T m . The residual stress in the matrix of ceramic composites can be either negative or positive due to a difference between the thermal expansion coefficients of the matrix and inclusion phases. It is shown that the fracture toughness and the flexural strength of ZrB 2 matrix composites can be increased by 25 % by the introduction of inclusions of specially selected refractory strengthening phases. Dependence of the normalized strength of composites ZrB 2 -B 4 C on the logarithm of normalized strain rate can be described by a power law in the range of strain rates from 10 -3 to 10 6 s -1 and temperatures from 295 K to about 1673 K. Results of simulations confirm that the technologies of SLS and SPS can be used for the production of UHTC composites with high values of the specific strength and the fracture toughness.

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“…Ethylene Glycol (CH2 (OH).CH2OH) (Density 1.112 g/cm 3 ) is used the immersing medium. Density and relative density is obtained for those fabricated composites, where the relative density is calculated by dividing the measured density to theoretical density (Calculated using rule of mixtures).…”

Section: Density and Porosity Measurementmentioning

confidence: 99%

“…Amongst various UHTCs, ZrB2 has been studied extensively for the last two decades. It has exceptional combination of high melting point (>3000°C), high thermal and electrical conductivity, moderate density (6.09 g/cm 3 ), and excellent chemical and physical stability in various atmospheres.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Mechanical Properties of Sintered Zrb2-Graphite Composites by Spark Plasma Sintering (Sps) Method

2015

International Conference on Advancements and Recent Innovations in Mechanical, Production and Industrial Engineering

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Abstract-Zirconiumdiboride-Graphite (ZrB2-C) composite is fabricated by spark plasma sintering (SPS) process. The ZrB2 powder is prepared by single step carbothermal process. The synthesized powder is mixed with Graphite powder (with varying composition of 5wt% and 10wt% of C) is compacted and subsequently densified using SPS. The formation of phases in the sintered composites along with its density, porosity, Vickers hardness, and micro structural characteristics are investigated. The study revealed that the ZrB2-5wt%C composite showed dense microstructure and better mechanical performance.

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Mechanical properties of ZrB2- and HfB2-based ultra-high temperature ceramics fabricated by spark plasma sintering

Cited by 188 publications

References 43 publications

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

Predicting the mechanical properties of ultra-high temperature ceramics

Preparation and Mechanical Properties of Sintered Zrb2-Graphite Composites by Spark Plasma Sintering (Sps) Method

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