Mechanical and thermal properties of low temperature sintered silicon carbide using a preceramic polymer as binder

Mehr, Mehrad; Moore, Donald T.; Esquivel-Elizondo, J. Roberto; Nino, Juan C.

doi:10.1007/s10853-015-9252-1

Cited by 10 publications

(7 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, the G peak of the silicon-carbon film deposited on the silicon substrate shifted to a lower wavenumber, and the full width at half maximum of the G peak was also larger than that of the silicon-carbon film, deposited on the Al 2 O 3 substrate. The high intensity of the D peak confirmed the existence of unsaturated hydrocarbons on the surface of SiC nanoparticles [21]. The bands attributed to the hexagonal 6H SiC polytype were observed.…”

Section: Characterizationmentioning

confidence: 70%

Electrochemical Deposition of Silicon-Carbon Films: A Study on the Nucleation and Growth Mechanism

et al. 2019

View full text Add to dashboard Cite

Silicon-carbon films have been deposited on silicon and Al2O3/Cr-Cu substrates, making use of the electrolysis of methanol/dimethylformamide-hexamethyldisilazane (HMDS) solutions. The electrodeposited films were characterized by Raman spectroscopy and scanning electron microscopy, respectively. Moreover, the nucleation and growth mechanism of the films were studied from the experimental current transients.

show abstract

Section: Characterizationmentioning

confidence: 70%

Electrochemical Deposition of Silicon-Carbon Films: A Study on the Nucleation and Growth Mechanism

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The effective mixing of the PCS, PMMA, and β-SiC powder requires the PCS viscosity to be reduced by dispersal in a solvent. Mehr et al 46 demonstrated the feasibility of diluting SMP-10 in n-hexane to coat ceramic powders. Furthermore, mesoporous membranes have been synthesized by König et al 61 using SMP-10 and α-SiC powder suspended in n-hexane resolving the mixing issue described by Kotani et al 48 and was therefore implemented here.…”

Section: Sample Preparationmentioning

confidence: 99%

“…8,10,[36][37][38] The ceramic foam synthesis approach used in this study exploits well-established polymer-derived ceramic (PDC) routes for the synthesis of silicon carbide (SiC) ceramic components. 36,37,[39][40][41][42][43][44] PDCs have been previously investigated as an alternative synthesis approach of ceramic parts to more traditional routes such as powder-based methods, 45,46 SiC fiber synthesis, 41,47 and ceramic matrix composite fabrication. 39,48,49 The thermal processing of liquid polycarbosilanes (PCSs) to a solid ceramic component involves large changes in composition and substantial reductions in mass and volume.…”

Section: Introductionmentioning

confidence: 99%

“…PDCs have been previously investigated as an alternative synthesis approach of ceramic parts to more traditional routes such as powder‐based methods, 45,46 SiC fiber synthesis, 41,47 and ceramic matrix composite fabrication 39,48,49 . The thermal processing of liquid polycarbosilanes (PCSs) to a solid ceramic component involves large changes in composition and substantial reductions in mass and volume.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanical property—processing relations for SiC foams synthesized via polymer particle templating of polycarbosilane

Kassner,

Wadley

2023

Int J Ceramic Engine & Sci

View full text Add to dashboard Cite

Silicon carbide foams with an average pore diameter of 650 nm and an inter‐pore ligament thickness of 150 nm have been synthesized using spherical polymethylmethacrylate (PMMA) particle templating of a β‐SiC nanoparticle‐loaded polycarbosilane (PCS) preceramic polymer and the effect of crystallization temperature upon their microstructure and mechanical properties investigated. Differential scanning calorimetry and thermogravimetric analysis were used to investigate both the kinetics of PMMA decomposition and the influence of β‐SiC nanoparticles upon the mechanisms of PCS cure, pyrolysis, and partial crystallization. As the crystallization temperature was systematically increased, the inter‐pore ligament structure coarsened and nanopores developed within the ligaments between the β‐SiC nanoparticles. The foam's Young's modulus and compressive strength at first increased with crystallization temperature, reaching a maximum after processing at 1300˚C. However, further increases in temperature resulted in a rapid fall in both foam modulus and compressive strength. To gain insight into the fundamental processes responsible for the overall (macroscale) mechanical properties, models for open/closed cell foams were inverted and used in conjunction with the measured foam density, Young's modulus, and compressive strength to estimate the mechanical properties of the inter‐pore ligaments. This procedure indicated that changes to the ligament properties were responsible for the observed dependence of the foam mechanical properties upon crystallization temperature.

show abstract

“…The ratio of the intensity of the D peak to the G peak (I D /I G ) is related to the cluster diameter of the free carbon domains [29]. A smaller ratio corresponds to smaller free carbon clusters.…”

Section: Film Characterizationmentioning

confidence: 99%

Fabrication of Gas-Sensor Chips Based on Silicon–Carbon Films Obtained by Electrochemical Deposition

et al. 2019

View full text Add to dashboard Cite

In this study, we designed two types of gas-sensor chips with silicon–carbon film, doped with CuO, as the sensitive layer. The first type of gas-sensor chip consists of an Al2O3 substrate with a conductive chromium sublayer of ~10 nm thickness and 200 Ω/□ surface resistance, deposited by magnetron sputtering. The second type was fabricated via the electrochemical deposition of a silicon–carbon film onto a dielectric substrate with copper electrodes formed by photoelectrochemical etching. The gas sensors are sensitive to the presence of CO and CH4 impurities in the air at operating temperatures above 150 °C, and demonstrated p- (type-1) and n-type (type-2) conductivity. The type-1 gas sensor showed fast response and recovery time but low sensitivity, while the type-2 sensor was characterized by high sensitivity but longer response and recovery time. The silicon–carbon films were characterized by the presence of the hexagonal 6H SiC polytype with the impurities of the rhombohedral 15 R SiC phase. XRD analysis revealed the presence of a CuO phase.

show abstract

Mechanical and thermal properties of low temperature sintered silicon carbide using a preceramic polymer as binder

Cited by 10 publications

References 40 publications

Electrochemical Deposition of Silicon-Carbon Films: A Study on the Nucleation and Growth Mechanism

Electrochemical Deposition of Silicon-Carbon Films: A Study on the Nucleation and Growth Mechanism

Mechanical property—processing relations for SiC foams synthesized via polymer particle templating of polycarbosilane

Fabrication of Gas-Sensor Chips Based on Silicon–Carbon Films Obtained by Electrochemical Deposition

Contact Info

Product

Resources

About