Phase transformation on spark plasma sintered dense polycarbosilane-derived SiC without additive

Lee, Ji Hwoan; Shin, Dong Geun; Noviyanto, Alfian; Lee, Heyon Myong; Nishimura, Toshiyuki; Jang, Byung Koog; Kwon, Woo Teck; Kim, Young‐Hee; Kim, Sukyoung; Han, Young Hwan

doi:10.1016/j.scriptamat.2017.02.031

Cited by 19 publications

(11 citation statements)

References 8 publications

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“…The phase transformation of SiC was reported to be closely dependent on the temperature, duration, pressure, 46 and doping element 47,48 . In particular, relatively high pressures (>50 MPa) can induce the phase transformation of β‐SiC to α‐SiC in SPS‐SiC ceramics within a short time (<10 min) 44,45 . Meanwhile, it is well documented that nitrogen can retard the phase transformation of β‐SiC to α‐SiC 47,48 .…”

Section: Resultsmentioning

confidence: 99%

Microstructural, electrical, and mechanical properties of conductive SiC ceramics fabricated by spark plasma sintering

Shen

Yang

et al. 2022

Int J Applied Ceramic Tech

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Nitrogen (N)-doped conductive silicon carbide (SiC) of various electrical resistivity grades can satisfy diverse requirements in engineering applications. To understand the mechanisms that determine the electrical resistivity of N-doped conductive SiC ceramics during the fast spark plasma sintering (SPS) process, SiC ceramics were synthesized using SPS in an N 2 atmosphere with SiC powder and traditional Al 2 O 3 -Y 2 O 3 additive as raw materials at a sintering temperature of 1850-2000 • C for 1-10 min. The electrical resistivity was successfully varied over a wide range of 10 −3 -10 1 Ω cm by modifying the sintering conditions. The SPS-SiC ceramics consisted of mainly Y-Al-Si-O-C-N glass phase and N-doped SiC. The Y-Al-Si-O-C-N glass phase decomposed to an Si-rich phase and Ndoped Y x Si y C z at 2000 • C. The Vickers hardness, elastic modulus, and fracture toughness of the SPS-SiC ceramics varied within the ranges of 14.35-25.12 GPa, 310.97-400.12 GPa, and 2.46-5.39 MPa m 1/2 , respectively. The electrical resistivity of the obtained SPS-SiC ceramics was primarily determined by their carrier mobility.

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Section: Resultsmentioning

confidence: 99%

Microstructural, electrical, and mechanical properties of conductive SiC ceramics fabricated by spark plasma sintering

Shen

Yang

et al. 2022

Int J Applied Ceramic Tech

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“…G. Franceschin et al 38 reported that the generation of electrical discharges during SPS induced a significant reduction of impurity phases in siliceous compounds. The application of pressure during densification has been reported to affect the phase formation in the sintered specimens 39‐41 …”

Section: Resultsmentioning

confidence: 99%

“…The application of pressure during densification has been reported to affect the phase formation in the sintered specimens. [39][40][41] FE-SEM micrographs and elemental mapping of the polished surfaces of the YB 2 C 2 sample are shown in Figure 5. The average grain size of the sintered YB 2 C 2 was 584 μm.…”

Section: Densification Of Yb 2 C 2 Powdermentioning

confidence: 99%

Synthesis of YB₂C₂ by high‐energy ball milling and reactive spark plasma sintering

2020

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X-ray pure yttrium diborodicarbide (YB 2 C 2) was synthesized for the first time via modified spark plasma sintering (SPS) using Y 2 O 3 , B 4 C, and carbon as starting materials. Homogeneous intermixing of the raw powder by high energy ball milling (HEBM) promoted the formation of YB 2 C 2 powder with layered structure by boro/ carbo-thermal reduction. The average particle size of the synthesized powder at an optimum synthesis temperature (1625℃) was 568 nm. Small amount of YB 2 C was formed by consuming YB 4 at and above 1625°C. The metal basis purity of the synthesized YB 2 C 2 powder was 99.84%. X-ray pure YB 2 C 2 was obtained by densifying the synthesized YB 2 C 2 powder at 1900°C for 60 minutes at a pressure of 80 MPa using SPS. This study reports a simple method for the fabrication of X-ray pure rare earth metal diborodicarbides (ReB 2 C 2). K E Y W O R D S high energy ball milling, powder, spark plasma sintering, yttrium diborodicarbides 1230 | NGUYEN Et al.

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“…Thanks to the highly covalent bonding of SiC which gives excellent resistance in the chemical and thermal, as well as outstanding mechanical properties [5,6]. However, like other covalent bonding materials, the sintering of SiC is practically challenging due to the low diffusivity of Si and C. Although the densification of SiC is also possible without sintering additives [7][8][9][10], the sintering condition of those SiC is in harsh conditions. For instance, a sintering temperature > 1800 °C is needed to obtain near the theoretical density of SiC [7,8,10].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the density of silicon carbide with the addition of nitrate-based additives

Dioktyanto

Aryanto²,

Noviyanto

et al. 2022

J min metall B Metall

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Dense monolithic silicon carbide (SiC) was successfully sintered by hot-pressing at 1750 ?C for 1 h under an applied pressure of 20 MPa with the addition of a nitrate-based additive. A relative density of more than 98% were obtained with the addition of MgO-Y2O3 and Al2O3-Y2O3 in nitrate form, while in the oxide form they were 85.0 and 96.0%, respectively. Indeed, MgO-Y2O3 showed poor densification due to the eutectic temperature of 2110?C, however, the addition of nitrate form of MgO-Y2O3 enhanced the densification greatly. The sintering mechanism in the nitrate-based additive is liquid phase sintering, which is identified by the presence of an oxide phase, i.e., Y2O3 in the SiC with the addition of Al2O3-Y2O3 in nitrate form. Moreover, the addition of nitrate form suppressed the grain growth of SiC, which was believed to be due to the adequate rearrangement stage during sintering.

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Phase transformation on spark plasma sintered dense polycarbosilane-derived SiC without additive

Cited by 19 publications

References 8 publications

Microstructural, electrical, and mechanical properties of conductive SiC ceramics fabricated by spark plasma sintering

Microstructural, electrical, and mechanical properties of conductive SiC ceramics fabricated by spark plasma sintering

Synthesis of YB₂C₂ by high‐energy ball milling and reactive spark plasma sintering

Enhancing the density of silicon carbide with the addition of nitrate-based additives

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Phase transformation on spark plasma sintered dense polycarbosilane-derived SiC without additive

Cited by 19 publications

References 8 publications

Microstructural, electrical, and mechanical properties of conductive SiC ceramics fabricated by spark plasma sintering

Microstructural, electrical, and mechanical properties of conductive SiC ceramics fabricated by spark plasma sintering

Synthesis of YB2C2 by high‐energy ball milling and reactive spark plasma sintering

Enhancing the density of silicon carbide with the addition of nitrate-based additives

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Product

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Synthesis of YB₂C₂ by high‐energy ball milling and reactive spark plasma sintering