Matrix characterization of fibre-reinforced SiC matrix composites fabricated by chemical vapour infiltration

Stinton, D.P.; Hembree, D. M.; More, Karren L.; Sheldon, Brian W.; Besmann, Theodore M.; Headinger, M.H.; Davis, R. F.

doi:10.1007/bf00361507

Cited by 20 publications

(20 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that the SiC is initially deposited as very fine equiaxial nanocrystalline but quickly changes to much large columnar grain along the growth direction. When a large number of errors occur in the regular sequence of atomic layers in hexagonal close packed structure, high density SFs are formed . The high‐resolution TEM image of CVI‐SiC matrix and the corresponding selected‐area electron diffraction (SAED) pattern are shown in Figure , which indicates the existence of dense SFs.…”

Section: Resultsmentioning

confidence: 99%

“…There is a low‐density peak (marked with stacking faults (SFs)) at the diffraction angle of 33.7°, which reflects the spontaneously formed SFs during the SiC growth. In fact, it has been reported that SFs, twins, and dislocations are very often observed in CVD‐SiC . In the process of β‐SiC crystal growth, the growth pattern is extremely significant, exhibiting an alternate stacking of equiaxial nanocrystalline and much large columnar grain.…”

Section: Resultsmentioning

confidence: 99%

“…In fact, it has been reported that SFs, twins, and dislocations are very often observed in CVD-SiC. [58][59][60][61] In the process of b-SiC crystal growth, the growth pattern is extremely significant, exhibiting an alternate stacking of equiaxial nanocrystalline and much large columnar grain. Note that the SiC is initially deposited as very fine equiaxial nanocrystalline but quickly changes to much large columnar grain along the growth direction.…”

Section: Phase Compositionmentioning

confidence: 99%

See 2 more Smart Citations

Anisotropic compressive properties of porous CNT/SiC composites produced by direct matrix infiltration of CNT aerogel

et al. 2017

View full text Add to dashboard Cite

Carbon nanotube‐reinforced silicon carbide composites (CNT/SiC) produced by direct infiltration of matrix into a porous CNT arrays have been demonstrated to possess a unique microstructure and excellent micro‐mechanical properties. However, the thickness of the array preforms is usually very small, typically less than 2 mm. Therefore, fabrication of macroscopic CNT/SiC composites by chemical vapor infiltration (CVI) process requires that the nanoscale fillers could form macroscopic architectures with an open pore network. Here, this study reports an experimental strategy for the fabrication of SiC matrix composites reinforced by CNT based on an ice‐segregation‐induced self‐assembly (ISISA) technique. Macroscopic CNT aerogel with well‐defined macroporous network was produced by ISISA technique and was subsequently infiltrated by SiC in a CVI reactor. After five CVI cycles, the porosity of as‐fabricated composites was 11.6±0.3% and the machined specimens exhibited lamellar structure with parallel lamellaes intersected at discrete angles. By observed, there are in fact five different representative anisotropic macrostructures, the compressive strengths of these five different loading modes with respect to lamella orientation were 933±55, 619±34, 200±45, 199±21, and 297±41 MPa, respectively, and the failure mechanisms were attributed to the anisotropic nature of the macrostructures. Energy dissipation toughening mechanism at the nanoscale such as CNT pull‐out was observed and the phase composition of the fabricated materials included β‐SiC, CNT, and SiO2.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Phase Compositionmentioning

confidence: 99%

See 1 more Smart Citation

Anisotropic compressive properties of porous CNT/SiC composites produced by direct matrix infiltration of CNT aerogel

et al. 2017

View full text Add to dashboard Cite

show abstract

“…5,23,37,42 Although the reasons for this were not investigated directly, they are probably a result of a combination of factors including the change in the sample thermal conductivity and dielectric characteristics with increasing sample density as a function of time. 6 and 7, suggest that the initial central hot zone remained stable in size for approximately the first 6 h and then gradually expanded across the diameter of the sample in the form of a ''moving front,'' which could be considered to be similar in principle to the ''reaction front'' found in FCVI.…”

Section: Discussionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7] The main benefit is its ability to produce materials with attractive mechanical properties at relatively low processing temperatures 2,8-10 and pressures, 2,4,11,12 which reduce fiber stress and damage. [1][2][3][4][5][6][7] The main benefit is its ability to produce materials with attractive mechanical properties at relatively low processing temperatures 2,8-10 and pressures, 2,4,11,12 which reduce fiber stress and damage.…”

Section: Introductionmentioning

confidence: 99%

Microwave Heated Chemical Vapor Infiltration: Densification Mechanism of SiC_f/SiC Composites

Jaglin¹,

Binner²,

Vaidhyanathan³

et al. 2006

Journal of the American Ceramic Society

View full text Add to dashboard Cite

Silicon carbide fiber‐reinforced silicon carbide matrix composites (SiCf/SiC) have been produced using microwave heated chemical vapor infiltration. Preferential densification of the composite from the inside out was clearly observed. Although an average relative density of only 55% was achieved in 24 h, representative of an ∼26% increase over the initial fiber vol%, the center of the preform densified to 73% of the theoretical. The densification mechanisms were investigated using X‐ray absorptiometry and scanning electron microscopy. The initial inverse temperature profile obtained, which was found to result in the efficient filling of the intratow porosity, although not the intertow porosity, flattened out after approximately 6 h as the densification front moved outward toward the edges. Although not investigated directly, the evidence suggested that this was caused by changes in both the thermal conductivity and microwave absorption characteristics as the samples densified.

show abstract

Chemical Vapor Deposition (CVD) and Infiltration (CVI)

Besmann

Stinton

Lowden

et al. 1997

Carbide, Nitride and Boride Materials Synthesis and Processing

View full text Add to dashboard Cite

Matrix characterization of fibre-reinforced SiC matrix composites fabricated by chemical vapour infiltration

Cited by 20 publications

References 9 publications

Anisotropic compressive properties of porous CNT/SiC composites produced by direct matrix infiltration of CNT aerogel

Anisotropic compressive properties of porous CNT/SiC composites produced by direct matrix infiltration of CNT aerogel

Microwave Heated Chemical Vapor Infiltration: Densification Mechanism of SiC_f/SiC Composites

Chemical Vapor Deposition (CVD) and Infiltration (CVI)

Contact Info

Product

Resources

About

Matrix characterization of fibre-reinforced SiC matrix composites fabricated by chemical vapour infiltration

Cited by 20 publications

References 9 publications

Anisotropic compressive properties of porous CNT/SiC composites produced by direct matrix infiltration of CNT aerogel

Anisotropic compressive properties of porous CNT/SiC composites produced by direct matrix infiltration of CNT aerogel

Microwave Heated Chemical Vapor Infiltration: Densification Mechanism of SiCf/SiC Composites

Chemical Vapor Deposition (CVD) and Infiltration (CVI)

Contact Info

Product

Resources

About

Microwave Heated Chemical Vapor Infiltration: Densification Mechanism of SiC_f/SiC Composites