Anisotropy of elastic properties and thermal conductivity of Al2O3/h-BN composites

Rutkowski, Paweł; Piekarczyk, Wojciech; Stobierski, L.; Górny, G

doi:10.1007/s10973-013-3246-5

Cited by 16 publications

(13 citation statements)

References 17 publications

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“…5). This situation is similar to the h-BN orientation in hot-pressed Al 2 O 3 /h-BN composites [17]. It can have a very important influence on thermal conductivity of the composites, which will be presented in this study.…”

Section: Resultssupporting

confidence: 69%

Thermal stability and conductivity of hot-pressed Si3N4–graphene composites

Rutkowski

Stobierski

Górny

2013

J Therm Anal Calorim

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This study concerns new Si 3 N 4 -graphene composites manufactured using the hot-pressing method. Because of future applications of silicon nitride for cutting tools or specific parts of various devices having contact with high temperatures there is a need to find a ceramic composite material with good mechanical and especially thermal properties. Excellent thermal properties in the major directions are characteristic of graphene. In this study, the graphene phase is added to the silicon nitride phase in a quantity of up to 10 mass%, and the materials are sintered under uniaxial pressure. The mixture of AlN and Y 2 O 3 is added as sintering activator to the composite matrix. The studies focus on thermal stability of produced composites in argon and air conditions up to the temperature of 1,000°C. The research also concerns the influence of applied uniaxial pressure during the sintering process on the orientation of graphene nanoparticles in the Si 3 N 4 matrix. The study also presents research on anisotropy of thermal diffusivity and following thermal conductivity of ceramic matrix composites versus the increasing graphene quantity. Most of the presented results have not been published in the literature yet.

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Section: Resultssupporting

confidence: 69%

Thermal stability and conductivity of hot-pressed Si3N4–graphene composites

Rutkowski

Stobierski

Górny

2013

J Therm Anal Calorim

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“…Room temperature mechanical properties of Al 2 O 3 /h-BN refractories samples were investigated, and the results are depicted in Table II. The results show that fracture strength r f , Young's modulus E, fracture toughness K IC , and work of fracture c WOF were all decreased with the increase of h-BN content fraction, as also observed by Rutkowski et al [19] and Kusunose et al [31] The mechanical properties were closely associated with the physical properties such as AP and BD. The variation trend of the BD was same as that of the mechanical properties and these observations were in accordance with previous studies.…”

Section: A the Phase Composition And Microstructuresupporting

confidence: 77%

“…They claimed excellent machinability, high strength, high strain tolerance, and low Young's modulus, which were attributed to the weak gain boundaries. Rutkowski et al [19] reported that the materials with different amount of h-BN phases showed a decrease in relative density, Young's modulus, and thermal conductivity with the increase of volume fraction of h-BN dispersed in Al 2 O 3 matrix. However, no data concerning correlation between mechanical properties and TSR of this kind of material were found in the literature.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Thermal Shock Resistance of Alumina/Hexagonal Boron Nitride Composite Refractories

Liang

Xue

Zhao

et al. 2015

Metall Mater Trans A

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Alumina/hexagonal boron nitride (Al 2 O 3 /h-BN) composite refractories were fabricated with various h-BN contents, to study the effects on the mechanical properties and thermal shock resistance (TSR) of the composite refractories. The results showed that the mechanical properties of the composite refractories, including fracture strength, Young's modulus, fracture toughness, work of fracture, and decreased with the increase of h-BN amount. However, the residual flexural strength ratio after thermal shock test was increased with increasing the h-BN content, showing an improvement of TSR. The resistance to fracture propagation caused by the thermal stresses was increased, as supported by the R IV and R ST parameters.

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“…This situation can lead to the anisotropy of heat transport of ceramic matrix composites. In the case of hexagonal boron nitride dispersed phase, the thermal properties (conductivity) decrease in all of directions in comparison with reference pure material [23]. It is caused mostly by agglomeration of hexagonal boron nitride particles, where the agglomerates are porous.…”

Section: Introductionmentioning

confidence: 91%

“…The uniaxial pressing, which helps to densify the materials during the sintering, becomes a problem for ceramic-2D phase materials. The one direction of applied pressure causes the orientation of two-dimensional phase in the ceramic matrix [23,24]. This situation can lead to the anisotropy of heat transport of ceramic matrix composites.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties of pressure sintered alumina–graphene composites

Rutkowski

Klimczyk

Jaworska

et al. 2015

J Therm Anal Calorim

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The work concerns the alumina-graphene materials sintered by two different pressure methods. The different particle sizes of graphene were used. The preparation route of the matrix-graphene mixture was discussed in the paper. The so-prepared compositions with different amount of graphene were hot-pressed and spark plasma sintered. The influence on uniaxial pressure during the sintering process on the microstructure was presented by the SEM microstructural observations and ultrasonic measurements. The material with unidirectional oriented graphene particles was prepared, and the anisotropy was even higher than 30 % for 10 mass% of graphene additive. The influence of graphene orientation as an effect of pressing process on the thermal properties was analysed. The anisotropy of thermal conductivity was 90 % for 10 mass% of graphene. The thermal diffusivity and thermal conductivity of composites manufactured by hotpressing and spark plasma sintering method were compared. The experiment-based calculation of the specific heat versus temperature was presented in the paper. The thermal expansion coefficient was determined by dilatometric method. The thermal stability was analysed by thermogravimetric method, and it showed that composites with up to 2 mass% of graphene can work at temperatures higher than 700°C.

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Anisotropy of elastic properties and thermal conductivity of Al2O3/h-BN composites

Cited by 16 publications

References 17 publications

Thermal stability and conductivity of hot-pressed Si3N4–graphene composites

Thermal stability and conductivity of hot-pressed Si3N4–graphene composites

Mechanical Properties and Thermal Shock Resistance of Alumina/Hexagonal Boron Nitride Composite Refractories

Thermal properties of pressure sintered alumina–graphene composites

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