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Lim, Chang-Sung

doi:10.1023/a:1004743230570

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…The Bragg equation ( θ = λ) shows the interplanar spacing d increases with θ decreases, which states that the position of peaks shifts toward the lower 2 θ angles when d increases and the degree of the shift is related to change of c . The peak position of (110) shifts to a high angle can also be explained [29].…”

Section: Resultsmentioning

confidence: 99%

Structural, thermal and dielectric properties of AlN–SiC composites fabricated by plasma activated sintering

Wang

Liu

et al. 2019

Advances in Applied Ceramics

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Highly dense AlN-SiC composites with various SiC additions (0-50 wt-%) were fabricated at 1800°C by plasma activated sintering. The effect of SiC addition on structural, thermal and dielectric properties as well as microwave absorbing performance of the composites was investigated. The thermal conductivity decreases with increasing SiC addition, from 68.7 W (m K) −1 for 0 wt-% SiC to 19.38 W (m K) −1 for 50 wt-% SiC. On the contrary, the permittivity and dielectric loss increase gradually, from 7.6-8.5 to 22-26.7 and from 0.02-0.1 to 0.2-0.53, respectively. AlN-SiC composite with better thermal and dielectric properties in 30 wt-% SiC, whose thermal conductivity and dielectric loss are found to be 24.88 W (m K) −1 and 0.15-0.74, respectively. Furthermore, the composite exhibits microwave absorbing performance with the minimum reflection loss (RL) of −16.5 dB at 15.5 GHz and the frequency range of 2.6 GHz for RL below −10 dB (90% absorption).

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Section: Resultsmentioning

confidence: 99%

Structural, thermal and dielectric properties of AlN–SiC composites fabricated by plasma activated sintering

Wang

Liu

et al. 2019

Advances in Applied Ceramics

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“…According to previous studies, transformation of 3C to 6H and 6H to 4H polytypes generate more elongated and interlocked grains, that tends to increase the fracture toughness of SiC. In addition, primary β-SiC (3C) can develop the columnar inter-grains of 4H phase as secondary α-SiC with relatively uniform composition and grain size distribution, which increases fracture toughness 23,[50][51][52][53] . The elongated and interlocked grains are shown in Fig.…”

Section: Toughnessmentioning

confidence: 99%

“…Also, active mechanisms in improving the fracture toughness of SiC ceramics reinforced by graphene include crack deflection, crack bridging, tearing-open regions, relative slip between graphene layers, and crack branching 8 . In addition, the transformation of β-SiC (3C) to α-SiC (6H/4H) generates longer, interlocking grains that tend to increase the SiC fracture toughness 10,23,[50][51][52][53] .…”

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confidence: 99%

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αSiC - βSiC - graphene composites

Razmjoo

Baharvandi

Ehsani

2023

Sci Rep

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In this study, the mechanical properties of the pressureless sintered samples of α-SiC based composite containing 0–3 wt.% graphene and 0–15 wt.% nano β-SiC were investigated. Simultaneous usage of nano β-SiC and graphene and transformation of β-SiC (3C) to α-SiC (6H/4H) resulted in elongation of secondary α-SiC grains, which significantly improved the mechanical properties (e.g. fracture toughness) of SiC ceramics. According to the results, the highest Relative density of 99.04%, Young’s modulus of 537.76 GPa and fracture toughness of 5.73 MPa × m1/2 were obtained in the sample containing 5 wt.% nano β-SiC and 1 wt.% graphene (5B1G). In addition, two methods of measuring bending strength including three-point bending tests and biaxial tests (piston-on-three-ball) were compared. Strip-shaped specimens were prepared for three-point bending test and disc-shaped specimens were prepared for biaxial bending test. Each bending test was evaluated using a universal testing machine. The results showed that the biaxial bending strength is less than the three-point bending strength. Also, the maximum three-point bending strength of 582.01 MPa and biaxial bending of 441.56 MPa were obtained in 5 wt.% Nano β-SiC and 1 wt.% Graphene samples (5B1G). Studies have shown that in addition to the many advantages of using the biaxial bending method, the results have a very similar trend to the three-point bending strength. Also, the most-increased hardnesses of 28.03 GPa and 29.97 GPa were seen in the sample containing 5 wt.% nano β-SiC (5B) with forces of 10 N and 1 N, respectively. One of the effective mechanisms in improving the fracture toughness of α-SiC ceramics is crack deflection/bridging. Also, the difference in thermal expansion of the α-SiC matrix and the reinforcements, leading to the creation of residual stresses between the matrix grains and the reinforcement, is effective in improving the mechanical properties (e.g. strength and fracture toughness).

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Long term oxidation behaviour of liquid phase pressureless sintered SiC–AlN ceramics obtained without powder bed

Magnani

Beaulardi

2006

Journal of the European Ceramic Society

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Untitled

Cited by 7 publications

References 16 publications

Structural, thermal and dielectric properties of AlN–SiC composites fabricated by plasma activated sintering

Structural, thermal and dielectric properties of AlN–SiC composites fabricated by plasma activated sintering

αSiC - βSiC - graphene composites

Long term oxidation behaviour of liquid phase pressureless sintered SiC–AlN ceramics obtained without powder bed

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