Fabrication of alumina-based metal nanocomposites by pressureless sintering and their mechanical properties

Sung Tag Oh; Sung Ll Lee

doi:10.1166/jnn.2010.1544

Fabrication of alumina-based metal nanocomposites by pressureless sintering and their mechanical properties

Sung Tag Oh
, Sung Ll Lee

Dept. of Materials Science & Engineering

Seoul National University of Science and Technology (SNUST)

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

10 Scopus citations

Abstract

The processing conditions to prepare nano-sized Cu and Mo dispersed Al ₂0 ₃ (Al ₂0 ₃/Cu and AI ₂0 ₃/Mo) composites by pressureless sintering were explored. The composite powders of Al ₂0 ₃/Cu and AI ₂0 ₃/Mo were obtained by the hydrogen reduction of AI ₂0 ₃/CuO and AI ₂0 ₃/Mo03 powder mixtures and consolidated by pressureless sintering using infrared heating furnace with a heating rate of 200 °C/min. SEM and TEM analyses for the composite showed that the nano-sized metal particles were well distributed and situated on the grain boundaries of the Al ₂0 ₃ matrix. The nanocomposites, sintered at 1300 to 1500 deg;C for 4 min, showed the relative density of above 90%. Maximum hardness of 16.1 GPa was obtained in Al ₂0 ₃/Cu nanocomposites with sintering additive of 1 wt% MgO. The sintered nanocomposites exhibited the enhanced fracture toughness of above 4.5 MPa-m1/2, compared with monolithic Al ₂0 ₃. The mechanical properties were discussed in terms of observed microstructural characteristics.

Original language	English
Pages (from-to)	366-369
Number of pages	4
Journal	Journal of Nanoscience and Nanotechnology
Volume	10
Issue number	1
DOIs	https://doi.org/10.1166/jnn.2010.1544
State	Published - Jan 2010

Keywords

Ceramic nanocomposites
Metal dispersion
Pressureless sintering

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10.1166/jnn.2010.1544

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title = "Fabrication of alumina-based metal nanocomposites by pressureless sintering and their mechanical properties",

abstract = "The processing conditions to prepare nano-sized Cu and Mo dispersed Al 20 3 (Al 20 3/Cu and AI 20 3/Mo) composites by pressureless sintering were explored. The composite powders of Al 20 3/Cu and AI 20 3/Mo were obtained by the hydrogen reduction of AI 20 3/CuO and AI 20 3/Mo03 powder mixtures and consolidated by pressureless sintering using infrared heating furnace with a heating rate of 200 °C/min. SEM and TEM analyses for the composite showed that the nano-sized metal particles were well distributed and situated on the grain boundaries of the Al 20 3 matrix. The nanocomposites, sintered at 1300 to 1500 deg;C for 4 min, showed the relative density of above 90\%. Maximum hardness of 16.1 GPa was obtained in Al 20 3/Cu nanocomposites with sintering additive of 1 wt\% MgO. The sintered nanocomposites exhibited the enhanced fracture toughness of above 4.5 MPa-m1/2, compared with monolithic Al 20 3. The mechanical properties were discussed in terms of observed microstructural characteristics.",

keywords = "Ceramic nanocomposites, Metal dispersion, Pressureless sintering",

author = "Oh, \{Sung Tag\} and Lee, \{Sung Ll\}",

year = "2010",

month = jan,

doi = "10.1166/jnn.2010.1544",

language = "English",

volume = "10",

pages = "366--369",

journal = "Journal of Nanoscience and Nanotechnology",

issn = "1533-4880",

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AU - Oh, Sung Tag

AU - Lee, Sung Ll

PY - 2010/1

Y1 - 2010/1

N2 - The processing conditions to prepare nano-sized Cu and Mo dispersed Al 20 3 (Al 20 3/Cu and AI 20 3/Mo) composites by pressureless sintering were explored. The composite powders of Al 20 3/Cu and AI 20 3/Mo were obtained by the hydrogen reduction of AI 20 3/CuO and AI 20 3/Mo03 powder mixtures and consolidated by pressureless sintering using infrared heating furnace with a heating rate of 200 °C/min. SEM and TEM analyses for the composite showed that the nano-sized metal particles were well distributed and situated on the grain boundaries of the Al 20 3 matrix. The nanocomposites, sintered at 1300 to 1500 deg;C for 4 min, showed the relative density of above 90%. Maximum hardness of 16.1 GPa was obtained in Al 20 3/Cu nanocomposites with sintering additive of 1 wt% MgO. The sintered nanocomposites exhibited the enhanced fracture toughness of above 4.5 MPa-m1/2, compared with monolithic Al 20 3. The mechanical properties were discussed in terms of observed microstructural characteristics.

AB - The processing conditions to prepare nano-sized Cu and Mo dispersed Al 20 3 (Al 20 3/Cu and AI 20 3/Mo) composites by pressureless sintering were explored. The composite powders of Al 20 3/Cu and AI 20 3/Mo were obtained by the hydrogen reduction of AI 20 3/CuO and AI 20 3/Mo03 powder mixtures and consolidated by pressureless sintering using infrared heating furnace with a heating rate of 200 °C/min. SEM and TEM analyses for the composite showed that the nano-sized metal particles were well distributed and situated on the grain boundaries of the Al 20 3 matrix. The nanocomposites, sintered at 1300 to 1500 deg;C for 4 min, showed the relative density of above 90%. Maximum hardness of 16.1 GPa was obtained in Al 20 3/Cu nanocomposites with sintering additive of 1 wt% MgO. The sintered nanocomposites exhibited the enhanced fracture toughness of above 4.5 MPa-m1/2, compared with monolithic Al 20 3. The mechanical properties were discussed in terms of observed microstructural characteristics.

KW - Ceramic nanocomposites

KW - Metal dispersion

KW - Pressureless sintering

UR - https://www.scopus.com/pages/publications/77955075355

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DO - 10.1166/jnn.2010.1544

M3 - Article

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SN - 1533-4880

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ER -

Fabrication of alumina-based metal nanocomposites by pressureless sintering and their mechanical properties

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Keywords

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