A High Strength Alumina-Silicon Carbide-Boron Carbide Triplex Ceramic

Eric W. Neuman; Greg Hilmas; William Fahrenholtz

doi:10.1016/j.ceramint.2017.03.104

A High Strength Alumina-Silicon Carbide-Boron Carbide Triplex Ceramic

Eric W. Neuman
, Greg Hilmas
, William Fahrenholtz

Materials Science and Engineering

Missouri University of Science and Technology

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

Abstract

A ceramic particulate composite composed of oxide, and carbide ceramics was found to have high strength, hardness, and fracture toughness values. A composition consisting of Al ₂ O ₃ with 15 vol% SiC and 15 vol% B ₄ C additions was produced by hot-pressing at 1650⁰C for 30 min, with full density reached after ~5 min at temperature. Both WB and WB ₂ were observed, with the W source presumably an impurity from WC milling media, and Al ₁₈ B ₄ O ₃₃ was also detected following densification. Strength was~880 MPa, which is greater than values reported for comparable composites of Al ₂ O ₃ containing 30 vol% SiC or B ₄ C. Vickers hardness was ~21 GPa, and fracture toughness was ~4.5 MPa m ^1/2 , comparable to values reported for the binary mixtures. The calculated critical flaw size of the material was similar to the size of the SiC/B ₄ C clusters and microcracking at grain boundaries. The latter resulting from thermal expansion mismatch between the Al ₂ O ₃ matrix and SiC/B ₄ C resuborcing phases.

Original language	American English
Pages (from-to)	7958-7962
Number of pages	5
Journal	Ceramics International
Volume	43
Issue number	10
DOIs	https://doi.org/10.1016/j.ceramint.2017.03.104
State	Published - Jul 1 2017

Keywords

Aluminum oxide
Boron carbide
Hot-pressing
Microstructure
Silicon carbide
Strength
Binary mixtures
Fracture toughness
Grain boundaries
Hot pressing
Thermal expansion
Vickers hardness

Disciplines

Materials Science and Engineering

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10.1016/j.ceramint.2017.03.104License: CC BY

https://doi.org/10.1016/j.ceramint.2017.03.104

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@article{93b7b85cb8844ceebba8d97064fae746,

title = "A High Strength Alumina-Silicon Carbide-Boron Carbide Triplex Ceramic",

abstract = " A ceramic particulate composite composed of oxide, and carbide ceramics was found to have high strength, hardness, and fracture toughness values. A composition consisting of Al 2 O 3 with 15 vol\% SiC and 15 vol\% B 4 C additions was produced by hot-pressing at 1650⁰C for 30 min, with full density reached after \textasciitilde{}5 min at temperature. Both WB and WB 2 were observed, with the W source presumably an impurity from WC milling media, and Al 18 B 4 O 33 was also detected following densification. Strength was\textasciitilde{}880 MPa, which is greater than values reported for comparable composites of Al 2 O 3 containing 30 vol\% SiC or B 4 C. Vickers hardness was \textasciitilde{}21 GPa, and fracture toughness was \textasciitilde{}4.5 MPa m 1/2 , comparable to values reported for the binary mixtures. The calculated critical flaw size of the material was similar to the size of the SiC/B 4 C clusters and microcracking at grain boundaries. The latter resulting from thermal expansion mismatch between the Al 2 O 3 matrix and SiC/B 4 C resuborcing phases.",

keywords = "Aluminum oxide, Boron carbide, Hot-pressing, Microstructure, Silicon carbide, Strength, Binary mixtures, Fracture toughness, Grain boundaries, Hot pressing, Thermal expansion, Vickers hardness",

author = "Neuman, \{Eric W.\} and Greg Hilmas and William Fahrenholtz",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd and Techna Group S.r.l.",

year = "2017",

month = jul,

day = "1",

doi = "10.1016/j.ceramint.2017.03.104",

language = "American English",

volume = "43",

pages = "7958--7962",

journal = "Ceramics International",

number = "10",

}

TY - JOUR

T1 - A High Strength Alumina-Silicon Carbide-Boron Carbide Triplex Ceramic

AU - Neuman, Eric W.

AU - Hilmas, Greg

AU - Fahrenholtz, William

PY - 2017/7/1

Y1 - 2017/7/1

N2 - A ceramic particulate composite composed of oxide, and carbide ceramics was found to have high strength, hardness, and fracture toughness values. A composition consisting of Al 2 O 3 with 15 vol% SiC and 15 vol% B 4 C additions was produced by hot-pressing at 1650⁰C for 30 min, with full density reached after ~5 min at temperature. Both WB and WB 2 were observed, with the W source presumably an impurity from WC milling media, and Al 18 B 4 O 33 was also detected following densification. Strength was~880 MPa, which is greater than values reported for comparable composites of Al 2 O 3 containing 30 vol% SiC or B 4 C. Vickers hardness was ~21 GPa, and fracture toughness was ~4.5 MPa m 1/2 , comparable to values reported for the binary mixtures. The calculated critical flaw size of the material was similar to the size of the SiC/B 4 C clusters and microcracking at grain boundaries. The latter resulting from thermal expansion mismatch between the Al 2 O 3 matrix and SiC/B 4 C resuborcing phases.

AB - A ceramic particulate composite composed of oxide, and carbide ceramics was found to have high strength, hardness, and fracture toughness values. A composition consisting of Al 2 O 3 with 15 vol% SiC and 15 vol% B 4 C additions was produced by hot-pressing at 1650⁰C for 30 min, with full density reached after ~5 min at temperature. Both WB and WB 2 were observed, with the W source presumably an impurity from WC milling media, and Al 18 B 4 O 33 was also detected following densification. Strength was~880 MPa, which is greater than values reported for comparable composites of Al 2 O 3 containing 30 vol% SiC or B 4 C. Vickers hardness was ~21 GPa, and fracture toughness was ~4.5 MPa m 1/2 , comparable to values reported for the binary mixtures. The calculated critical flaw size of the material was similar to the size of the SiC/B 4 C clusters and microcracking at grain boundaries. The latter resulting from thermal expansion mismatch between the Al 2 O 3 matrix and SiC/B 4 C resuborcing phases.

KW - Aluminum oxide

KW - Boron carbide

KW - Hot-pressing

KW - Microstructure

KW - Silicon carbide

KW - Strength

KW - Binary mixtures

KW - Fracture toughness

KW - Grain boundaries

KW - Hot pressing

KW - Thermal expansion

KW - Vickers hardness

UR - https://scholarsmine.mst.edu/matsci_eng_facwork/1612

UR - https://doi.org/10.1016/j.ceramint.2017.03.104

U2 - 10.1016/j.ceramint.2017.03.104

DO - 10.1016/j.ceramint.2017.03.104

M3 - Article

VL - 43

SP - 7958

EP - 7962

JO - Ceramics International

JF - Ceramics International

IS - 10

ER -

A High Strength Alumina-Silicon Carbide-Boron Carbide Triplex Ceramic

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