High-Temperature Compressive Deformation of Si₃N₄/BN Fibrous Monoliths

Jules L. Routbort; Kenneth C. Goretta; Euntae Park; Dileep Kumar Singh; J. L. Finch; James M. Staehler; Larry P. Zawada; Greg Hilmas

doi:10.1002/9780470294567.ch49

High-Temperature Compressive Deformation of Si₃N₄/BN Fibrous Monoliths

Jules L. Routbort
, Kenneth C. Goretta
, Euntae Park
, Dileep Kumar Singh
, J. L. Finch
, James M. Staehler
, Larry P. Zawada
, Greg Hilmas

Materials Science and Engineering

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

Abstract

Fibrous monolithic Si ₃ N ₄ /BN (≈85 vol.% Si ₃ N ₄ /15 vol.% BN) and monolithic Si ₃ N ₄ ceramics were compressed at a nearly constant strain rate (ε) at 1200-1400 ⁰C in N ₂ . The ε range was ≈1x10 ^-6 to 5x10 ^-6 s ^-1 ; the stress (σ) range was 37-202 MPa. The Si ₃ N ₄ and the unidirectional fibrous monoliths that were oriented with the long axis of the Si ₃ N ₄ cells parallel to the compression direction exhibited plasticity at 1300 and 1400 ⁰C, with ε∝σ. A 0/90⁰ cross-ply Si ₃ N ₄ /BN laminate also exhibited significant plasticity, but it was weaker than the above-mentioned ceramics. The unidirectional fibrous monoliths that were compressed perpendicular to the cell direction fractured at ≈50 MPa in all tests. A ±45⁰ laminate tested at 1300 ⁰C fractured at a stress of ≈40 MPa. Low fracture stress correlated with shear through BN layers.

Original language	American English
Journal	Proceedings of the 1999 23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures (1999, Cocoa Beach, FL)
Volume	20
DOIs	https://doi.org/10.1002/9780470294567.ch49
State	Published - Jan 1 1999

Keywords

Boron compounds
Boron nitride
Ceramic fibers
Compressive deformation
Compressive stress
Crystal orientation
Deformation
Fracture testing
Laminates
Plasticity
Silicon nitride
Strain rate
Stress analysis

Disciplines

Materials Science and Engineering

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https://doi.org/10.1002/9780470294567.ch49

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Routbort, J. L., Goretta, K. C., Park, E., Singh, D. K., Finch, J. L., Staehler, J. M., Zawada, L. P., & Hilmas, G. (1999). High-Temperature Compressive Deformation of Si₃N₄/BN Fibrous Monoliths. Proceedings of the 1999 23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures (1999, Cocoa Beach, FL), 20. https://doi.org/10.1002/9780470294567.ch49

@article{d9545bcbcdb746ba8507c714c55092ef,

title = "High-Temperature Compressive Deformation of Si₃N₄/BN Fibrous Monoliths",

abstract = " Fibrous monolithic Si 3 N 4 /BN (≈85 vol.\% Si 3 N 4 /15 vol.\% BN) and monolithic Si 3 N 4 ceramics were compressed at a nearly constant strain rate (ε) at 1200-1400 ⁰C in N 2 . The ε range was ≈1x10 -6 to 5x10 -6 s -1 ; the stress (σ) range was 37-202 MPa. The Si 3 N 4 and the unidirectional fibrous monoliths that were oriented with the long axis of the Si 3 N 4 cells parallel to the compression direction exhibited plasticity at 1300 and 1400 ⁰C, with ε∝σ. A 0/90⁰ cross-ply Si 3 N 4 /BN laminate also exhibited significant plasticity, but it was weaker than the above-mentioned ceramics. The unidirectional fibrous monoliths that were compressed perpendicular to the cell direction fractured at ≈50 MPa in all tests. A ±45⁰ laminate tested at 1300 ⁰C fractured at a stress of ≈40 MPa. Low fracture stress correlated with shear through BN layers.",

keywords = "Boron compounds, Boron nitride, Ceramic fibers, Compressive deformation, Compressive stress, Crystal orientation, Deformation, Fracture testing, Laminates, Plasticity, Silicon nitride, Strain rate, Stress analysis",

author = "Routbort, \{Jules L.\} and Goretta, \{Kenneth C.\} and Euntae Park and Singh, \{Dileep Kumar\} and Finch, \{J. L.\} and Staehler, \{James M.\} and Zawada, \{Larry P.\} and Greg Hilmas",

year = "1999",

month = jan,

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doi = "10.1002/9780470294567.ch49",

language = "American English",

volume = "20",

journal = "Proceedings of the 1999 23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures (1999, Cocoa Beach, FL)",

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T1 - High-Temperature Compressive Deformation of Si₃N₄/BN Fibrous Monoliths

AU - Routbort, Jules L.

AU - Goretta, Kenneth C.

AU - Park, Euntae

AU - Singh, Dileep Kumar

AU - Finch, J. L.

AU - Staehler, James M.

AU - Zawada, Larry P.

AU - Hilmas, Greg

PY - 1999/1/1

Y1 - 1999/1/1

N2 - Fibrous monolithic Si 3 N 4 /BN (≈85 vol.% Si 3 N 4 /15 vol.% BN) and monolithic Si 3 N 4 ceramics were compressed at a nearly constant strain rate (ε) at 1200-1400 ⁰C in N 2 . The ε range was ≈1x10 -6 to 5x10 -6 s -1 ; the stress (σ) range was 37-202 MPa. The Si 3 N 4 and the unidirectional fibrous monoliths that were oriented with the long axis of the Si 3 N 4 cells parallel to the compression direction exhibited plasticity at 1300 and 1400 ⁰C, with ε∝σ. A 0/90⁰ cross-ply Si 3 N 4 /BN laminate also exhibited significant plasticity, but it was weaker than the above-mentioned ceramics. The unidirectional fibrous monoliths that were compressed perpendicular to the cell direction fractured at ≈50 MPa in all tests. A ±45⁰ laminate tested at 1300 ⁰C fractured at a stress of ≈40 MPa. Low fracture stress correlated with shear through BN layers.

AB - Fibrous monolithic Si 3 N 4 /BN (≈85 vol.% Si 3 N 4 /15 vol.% BN) and monolithic Si 3 N 4 ceramics were compressed at a nearly constant strain rate (ε) at 1200-1400 ⁰C in N 2 . The ε range was ≈1x10 -6 to 5x10 -6 s -1 ; the stress (σ) range was 37-202 MPa. The Si 3 N 4 and the unidirectional fibrous monoliths that were oriented with the long axis of the Si 3 N 4 cells parallel to the compression direction exhibited plasticity at 1300 and 1400 ⁰C, with ε∝σ. A 0/90⁰ cross-ply Si 3 N 4 /BN laminate also exhibited significant plasticity, but it was weaker than the above-mentioned ceramics. The unidirectional fibrous monoliths that were compressed perpendicular to the cell direction fractured at ≈50 MPa in all tests. A ±45⁰ laminate tested at 1300 ⁰C fractured at a stress of ≈40 MPa. Low fracture stress correlated with shear through BN layers.

KW - Boron compounds

KW - Boron nitride

KW - Ceramic fibers

KW - Compressive deformation

KW - Compressive stress

KW - Crystal orientation

KW - Deformation

KW - Fracture testing

KW - Laminates

KW - Plasticity

KW - Silicon nitride

KW - Strain rate

KW - Stress analysis

UR - https://scholarsmine.mst.edu/matsci_eng_facwork/1603

UR - https://doi.org/10.1002/9780470294567.ch49

U2 - 10.1002/9780470294567.ch49

DO - 10.1002/9780470294567.ch49

M3 - Article

VL - 20

JO - Proceedings of the 1999 23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures (1999, Cocoa Beach, FL)

JF - Proceedings of the 1999 23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures (1999, Cocoa Beach, FL)

ER -

High-Temperature Compressive Deformation of Si₃N₄/BN Fibrous Monoliths

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