Fracture toughness (KIC & γwof) of a HIPed Si3N4 at elevated temperatures

A. A. Wereszczak; M. K. Ferber; R. R. Sanders; M. G. Jenkins; P. Khandelwal

doi:10.1002/9780470314180.ch10

Fracture toughness (K_IC & γwof) of a HIPed Si₃N₄ at elevated temperatures

A. A. Wereszczak, M. K. Ferber, R. R. Sanders, M. G. Jenkins, P. Khandelwal

Mechanical Properties and Mechanics

Research output: Contribution to journal › Conference article › peer-review

7 Scopus citations

Abstract

Chevron-notched bend bars of a hot isostatically pressed (HIPed) silicon nitride (PY6) were tested in three-point flexure in air at 25, 1000, 1200, 1300, and 1400°C. Stable crack growth was consistently produced at all the test temperatures. Average fracture toughness, K_Ic, and work of fracture, γwof, decreased from 6.4 MPa·√m and 52J/m², respectively, at 25°C to 4.5 MPa·√m and 44 J/m² at 1200°C; a 29% and 15% decrease in K_Ic and γwof. Tests conducted at 1300°C activated high temperature deformation mechanisms, which effectively caused greater specimen ductility and apparent greater fracture resistances. At 1400°C, K_Ic and γwof were 6.5 MPa·√m and 159 J/m², respectively.

Original language	English
Pages (from-to)	101-112
Number of pages	12
Journal	Ceramic Engineering and Science Proceedings
Volume	14
Issue number	7 -8 pt 1
DOIs	https://doi.org/10.1002/9780470314180.ch10
State	Published - 1993
Event	Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials - Cocoa Beach, FL, USA Duration: Jan 10 1993 → Jan 15 1993

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title = "Fracture toughness (KIC & γwof) of a HIPed Si3N4 at elevated temperatures",

abstract = "Chevron-notched bend bars of a hot isostatically pressed (HIPed) silicon nitride (PY6) were tested in three-point flexure in air at 25, 1000, 1200, 1300, and 1400°C. Stable crack growth was consistently produced at all the test temperatures. Average fracture toughness, KIc, and work of fracture, γwof, decreased from 6.4 MPa·√m and 52J/m2, respectively, at 25°C to 4.5 MPa·√m and 44 J/m2 at 1200°C; a 29% and 15% decrease in KIc and γwof. Tests conducted at 1300°C activated high temperature deformation mechanisms, which effectively caused greater specimen ductility and apparent greater fracture resistances. At 1400°C, KIc and γwof were 6.5 MPa·√m and 159 J/m2, respectively.",

author = "Wereszczak, {A. A.} and Ferber, {M. K.} and Sanders, {R. R.} and Jenkins, {M. G.} and P. Khandelwal",

year = "1993",

doi = "10.1002/9780470314180.ch10",

language = "English",

volume = "14",

pages = "101--112",

journal = "Ceramic Engineering and Science Proceedings",

issn = "0196-6219",

number = "7 -8 pt 1",

note = "Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials ; Conference date: 10-01-1993 Through 15-01-1993",

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TY - JOUR

T1 - Fracture toughness (KIC & γwof) of a HIPed Si3N4 at elevated temperatures

AU - Wereszczak, A. A.

AU - Ferber, M. K.

AU - Sanders, R. R.

AU - Jenkins, M. G.

AU - Khandelwal, P.

PY - 1993

Y1 - 1993

N2 - Chevron-notched bend bars of a hot isostatically pressed (HIPed) silicon nitride (PY6) were tested in three-point flexure in air at 25, 1000, 1200, 1300, and 1400°C. Stable crack growth was consistently produced at all the test temperatures. Average fracture toughness, KIc, and work of fracture, γwof, decreased from 6.4 MPa·√m and 52J/m2, respectively, at 25°C to 4.5 MPa·√m and 44 J/m2 at 1200°C; a 29% and 15% decrease in KIc and γwof. Tests conducted at 1300°C activated high temperature deformation mechanisms, which effectively caused greater specimen ductility and apparent greater fracture resistances. At 1400°C, KIc and γwof were 6.5 MPa·√m and 159 J/m2, respectively.

AB - Chevron-notched bend bars of a hot isostatically pressed (HIPed) silicon nitride (PY6) were tested in three-point flexure in air at 25, 1000, 1200, 1300, and 1400°C. Stable crack growth was consistently produced at all the test temperatures. Average fracture toughness, KIc, and work of fracture, γwof, decreased from 6.4 MPa·√m and 52J/m2, respectively, at 25°C to 4.5 MPa·√m and 44 J/m2 at 1200°C; a 29% and 15% decrease in KIc and γwof. Tests conducted at 1300°C activated high temperature deformation mechanisms, which effectively caused greater specimen ductility and apparent greater fracture resistances. At 1400°C, KIc and γwof were 6.5 MPa·√m and 159 J/m2, respectively.

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U2 - 10.1002/9780470314180.ch10

DO - 10.1002/9780470314180.ch10

M3 - Conference article

AN - SCOPUS:0027635231

SN - 0196-6219

VL - 14

SP - 101

EP - 112

JO - Ceramic Engineering and Science Proceedings

JF - Ceramic Engineering and Science Proceedings

IS - 7 -8 pt 1

T2 - Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials

Y2 - 10 January 1993 through 15 January 1993

ER -

Fracture toughness (K_IC & γwof) of a HIPed Si₃N₄ at elevated temperatures

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