Effect of Nb2O5 addition on microstructure and thermal/mechanical properties in zirconia-toughened alumina sintered at low temperature

Woong Kyeong Seong; Byeong Min Ahn; Yuho Min; Geon Tae Hwang; Jong Jin Choi; Joon Hwan Choi; Byung Dong Hahn; Young Rae Cho; Cheol Woo Ahn

doi:10.1016/j.ceramint.2020.06.158

Effect of Nb₂O₅ addition on microstructure and thermal/mechanical properties in zirconia-toughened alumina sintered at low temperature

Woong Kyeong Seong, Byeong Min Ahn, Yuho Min, Geon Tae Hwang, Jong Jin Choi, Joon Hwan Choi, Byung Dong Hahn, Young Rae Cho, Cheol Woo Ahn

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8 Scopus citations

Abstract

In the ceramic industry, alumina is widely used as a heat dissipation substrate, and the sintering temperature of alumina is known to be higher than 1500 °C. Nb₂O₅ is added to lower the sintering temperature of alumina, and the effect of the additive on the microstructure of the sintered specimen is described in this manuscript. The Nb₂O₅ powder ground by a planetary ball-mill is added to alumina in order for a Nb₂O₅ particle to be effectively dispersed among the alumina particles. In addition, Y-stabilized zirconia (YSZ) is also added to suppress the rapid grain growth due to the addition of Nb₂O₅. Consequently, a thermal conductivity of 34.1 W/mK and a flexural strength of 385 MPa were obtained in the alumina specimen sintered at 1400 °C. These properties are similar to those of a commercial alumina currently used for ceramic substrates. This material has a considerable advantage at the cost of process owing to the sintering temperature of 1400 °C.

Original language	English
Pages (from-to)	23820-23827
Number of pages	8
Journal	Ceramics International
Volume	46
Issue number	15
DOIs	https://doi.org/10.1016/j.ceramint.2020.06.158
State	Published - 15 Oct 2020

Keywords

Alumina
Flexural strength
Low temperature sintering
Microstructure
Thermal conductivity

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10.1016/j.ceramint.2020.06.158

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title = "Effect of Nb2O5 addition on microstructure and thermal/mechanical properties in zirconia-toughened alumina sintered at low temperature",

abstract = "In the ceramic industry, alumina is widely used as a heat dissipation substrate, and the sintering temperature of alumina is known to be higher than 1500 °C. Nb2O5 is added to lower the sintering temperature of alumina, and the effect of the additive on the microstructure of the sintered specimen is described in this manuscript. The Nb2O5 powder ground by a planetary ball-mill is added to alumina in order for a Nb2O5 particle to be effectively dispersed among the alumina particles. In addition, Y-stabilized zirconia (YSZ) is also added to suppress the rapid grain growth due to the addition of Nb2O5. Consequently, a thermal conductivity of 34.1 W/mK and a flexural strength of 385 MPa were obtained in the alumina specimen sintered at 1400 °C. These properties are similar to those of a commercial alumina currently used for ceramic substrates. This material has a considerable advantage at the cost of process owing to the sintering temperature of 1400 °C.",

keywords = "Alumina, Flexural strength, Low temperature sintering, Microstructure, Thermal conductivity",

author = "Seong, {Woong Kyeong} and Ahn, {Byeong Min} and Yuho Min and Hwang, {Geon Tae} and Choi, {Jong Jin} and Choi, {Joon Hwan} and Hahn, {Byung Dong} and Cho, {Young Rae} and Ahn, {Cheol Woo}",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd and Techna Group S.r.l.",

year = "2020",

month = oct,

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doi = "10.1016/j.ceramint.2020.06.158",

language = "English",

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T1 - Effect of Nb2O5 addition on microstructure and thermal/mechanical properties in zirconia-toughened alumina sintered at low temperature

AU - Seong, Woong Kyeong

AU - Ahn, Byeong Min

AU - Min, Yuho

AU - Hwang, Geon Tae

AU - Choi, Jong Jin

AU - Choi, Joon Hwan

AU - Hahn, Byung Dong

AU - Cho, Young Rae

AU - Ahn, Cheol Woo

PY - 2020/10/15

Y1 - 2020/10/15

N2 - In the ceramic industry, alumina is widely used as a heat dissipation substrate, and the sintering temperature of alumina is known to be higher than 1500 °C. Nb2O5 is added to lower the sintering temperature of alumina, and the effect of the additive on the microstructure of the sintered specimen is described in this manuscript. The Nb2O5 powder ground by a planetary ball-mill is added to alumina in order for a Nb2O5 particle to be effectively dispersed among the alumina particles. In addition, Y-stabilized zirconia (YSZ) is also added to suppress the rapid grain growth due to the addition of Nb2O5. Consequently, a thermal conductivity of 34.1 W/mK and a flexural strength of 385 MPa were obtained in the alumina specimen sintered at 1400 °C. These properties are similar to those of a commercial alumina currently used for ceramic substrates. This material has a considerable advantage at the cost of process owing to the sintering temperature of 1400 °C.

AB - In the ceramic industry, alumina is widely used as a heat dissipation substrate, and the sintering temperature of alumina is known to be higher than 1500 °C. Nb2O5 is added to lower the sintering temperature of alumina, and the effect of the additive on the microstructure of the sintered specimen is described in this manuscript. The Nb2O5 powder ground by a planetary ball-mill is added to alumina in order for a Nb2O5 particle to be effectively dispersed among the alumina particles. In addition, Y-stabilized zirconia (YSZ) is also added to suppress the rapid grain growth due to the addition of Nb2O5. Consequently, a thermal conductivity of 34.1 W/mK and a flexural strength of 385 MPa were obtained in the alumina specimen sintered at 1400 °C. These properties are similar to those of a commercial alumina currently used for ceramic substrates. This material has a considerable advantage at the cost of process owing to the sintering temperature of 1400 °C.

KW - Alumina

KW - Flexural strength

KW - Low temperature sintering

KW - Microstructure

KW - Thermal conductivity

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JF - Ceramics International

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Effect of Nb₂O₅ addition on microstructure and thermal/mechanical properties in zirconia-toughened alumina sintered at low temperature

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