Synthesis of (α- and β-)Si3N4/Si2N2O into silicon particulate porous preforms by hybrid system CVI and direct nitridation

J. C. Flores-García; M. I. Pech-Canul; A. L. Leal-Cruz; J. C. Rendón-Angeles

doi:10.1016/j.jeurceramsoc.2011.08.006

Synthesis of (α- and β-)Si3N4/Si2N2O into silicon particulate porous preforms by hybrid system CVI and direct nitridation

J. C. Flores-García, M. I. Pech-Canul^*, A. L. Leal-Cruz, J. C. Rendón-Angeles

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

An investigation on the microstructure and mechanical properties of Si/Si₃N₄/Si₂N₂O porous ceramic composites, synthesized in a multi-step approach via hybrid precursor system chemical vapor infiltration (HYSYCVI) and direct nitridation (DN) has been conducted. Particulate silicon porous preforms were infiltrated in subsequent stages S1-1, S1-2 (both at 1300°C for 70min in high purity nitrogen (HPN) using Na₂SiF₆ as solid precursor) and S2 (1350°C for 120min in ultra high purity nitrogen (UHPN)). Chemical reactions that account for the formation of Si₂N₂O and Si₃N₄ are proposed. Results show that the microstructure of the composites was influenced by atmosphere type and processing stage, affecting kind, morphology and size (including nanometric size) of nitrides formed. Porous composites (43% porosity) with modulus of rupture (MOR)≈43±3.5MPa (evaluated in four-point bending tests) and elastic modulus (E)≈29GPa (determined by the pulse-echo ultrasonic method) are routinely obtained.

Original language	English
Pages (from-to)	175-184
Number of pages	10
Journal	Journal of the European Ceramic Society
Volume	32
Issue number	1
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2011.08.006
State	Published - Jan 2012

Bibliographical note

Funding Information:
Authors gratefully acknowledge CONACyT for financial support under contract No. SEP-CONACYT-2005-1/24322. Also, Mr. J.C. Flores-García expresses his gratitude to CONACyT for providing a scholarship. Finally, the authors also thank Mrs. M. Rivas-Aguilar and S. Rodriguez-Arias for technical assistance during the analysis by SEM and XRD, respectively.

Keywords

A. Powders-gas phase reaction
B. Composites
D. Nitrides
E. Structural applications
HYSYCVI

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10.1016/j.jeurceramsoc.2011.08.006

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title = "Synthesis of (α- and β-)Si3N4/Si2N2O into silicon particulate porous preforms by hybrid system CVI and direct nitridation",

abstract = "An investigation on the microstructure and mechanical properties of Si/Si3N4/Si2N2O porous ceramic composites, synthesized in a multi-step approach via hybrid precursor system chemical vapor infiltration (HYSYCVI) and direct nitridation (DN) has been conducted. Particulate silicon porous preforms were infiltrated in subsequent stages S1-1, S1-2 (both at 1300°C for 70min in high purity nitrogen (HPN) using Na2SiF6 as solid precursor) and S2 (1350°C for 120min in ultra high purity nitrogen (UHPN)). Chemical reactions that account for the formation of Si2N2O and Si3N4 are proposed. Results show that the microstructure of the composites was influenced by atmosphere type and processing stage, affecting kind, morphology and size (including nanometric size) of nitrides formed. Porous composites (43% porosity) with modulus of rupture (MOR)≈43±3.5MPa (evaluated in four-point bending tests) and elastic modulus (E)≈29GPa (determined by the pulse-echo ultrasonic method) are routinely obtained.",

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author = "Flores-Garc{\'i}a, {J. C.} and Pech-Canul, {M. I.} and Leal-Cruz, {A. L.} and Rend{\'o}n-Angeles, {J. C.}",

note = "Funding Information: Authors gratefully acknowledge CONACyT for financial support under contract No. SEP-CONACYT-2005-1/24322. Also, Mr. J.C. Flores-Garc{\'i}a expresses his gratitude to CONACyT for providing a scholarship. Finally, the authors also thank Mrs. M. Rivas-Aguilar and S. Rodriguez-Arias for technical assistance during the analysis by SEM and XRD, respectively.",

year = "2012",

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AU - Flores-García, J. C.

AU - Pech-Canul, M. I.

AU - Leal-Cruz, A. L.

AU - Rendón-Angeles, J. C.

N1 - Funding Information: Authors gratefully acknowledge CONACyT for financial support under contract No. SEP-CONACYT-2005-1/24322. Also, Mr. J.C. Flores-García expresses his gratitude to CONACyT for providing a scholarship. Finally, the authors also thank Mrs. M. Rivas-Aguilar and S. Rodriguez-Arias for technical assistance during the analysis by SEM and XRD, respectively.

PY - 2012/1

Y1 - 2012/1

N2 - An investigation on the microstructure and mechanical properties of Si/Si3N4/Si2N2O porous ceramic composites, synthesized in a multi-step approach via hybrid precursor system chemical vapor infiltration (HYSYCVI) and direct nitridation (DN) has been conducted. Particulate silicon porous preforms were infiltrated in subsequent stages S1-1, S1-2 (both at 1300°C for 70min in high purity nitrogen (HPN) using Na2SiF6 as solid precursor) and S2 (1350°C for 120min in ultra high purity nitrogen (UHPN)). Chemical reactions that account for the formation of Si2N2O and Si3N4 are proposed. Results show that the microstructure of the composites was influenced by atmosphere type and processing stage, affecting kind, morphology and size (including nanometric size) of nitrides formed. Porous composites (43% porosity) with modulus of rupture (MOR)≈43±3.5MPa (evaluated in four-point bending tests) and elastic modulus (E)≈29GPa (determined by the pulse-echo ultrasonic method) are routinely obtained.

AB - An investigation on the microstructure and mechanical properties of Si/Si3N4/Si2N2O porous ceramic composites, synthesized in a multi-step approach via hybrid precursor system chemical vapor infiltration (HYSYCVI) and direct nitridation (DN) has been conducted. Particulate silicon porous preforms were infiltrated in subsequent stages S1-1, S1-2 (both at 1300°C for 70min in high purity nitrogen (HPN) using Na2SiF6 as solid precursor) and S2 (1350°C for 120min in ultra high purity nitrogen (UHPN)). Chemical reactions that account for the formation of Si2N2O and Si3N4 are proposed. Results show that the microstructure of the composites was influenced by atmosphere type and processing stage, affecting kind, morphology and size (including nanometric size) of nitrides formed. Porous composites (43% porosity) with modulus of rupture (MOR)≈43±3.5MPa (evaluated in four-point bending tests) and elastic modulus (E)≈29GPa (determined by the pulse-echo ultrasonic method) are routinely obtained.

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KW - B. Composites

KW - D. Nitrides

KW - E. Structural applications

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JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 1

ER -

Synthesis of (α- and β-)Si3N4/Si2N2O into silicon particulate porous preforms by hybrid system CVI and direct nitridation

Abstract

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Keywords

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