Fabrication of functionally graded Al/Al2O3 materials using pulse current pressure sintering process

Takekazu Nagae; Mai Mizubayashi; Masaru Yokota; Masateru Nose; Tomoaki Ishiguro; Shigeoki Saji

doi:10.2464/jilm.52.471

Fabrication of functionally graded Al/Al₂O₃ materials using pulse current pressure sintering process

Takekazu Nagae^*, Mai Mizubayashi, Masaru Yokota, Masateru Nose, Tomoaki Ishiguro, Shigeoki Saji

^*Corresponding author for this work

Department of Art and Design

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

Abstract

To fabricate densified Al/Al₂O₃ functionally graded materials (FGM) on hardness and thermal expansion, a pulse current pressure sintering process was employed. This FGM consists of an aluminum layer, an α-Al₂O₃ layer and 7 inter layers between them. As a starting material, aluminum and Al(OH)₃ powders were used. Results obtained were as follows. (1) Temperature of an upper punch which directly contact with Al₂O₃ layer reached about 1800 K when the mold temperature reached about 870 K of holding temperature. (2) Mechanical grinding of powder mixture of Al(OH)₃ and 20 mass% α-Al₂O₃ reduced the transformation temperature of Al(OH)₃ to α-Al₂O₃ by 300 K. (3) The hardness of inter layers gradually increased as the volume fraction of γ-Al₂O₃ increased. Top layer which consists of α-Al₂O₃ was about 1000 HV in average and the surface of this layer reached 1500 HV.

Original language	English
Pages (from-to)	471-476
Number of pages	6
Journal	Keikinzoku/Journal of Japan Institute of Light Metals
Volume	52
Issue number	10
DOIs	https://doi.org/10.2464/jilm.52.471
State	Published - 2002/10

Keywords

Alumina
Aluminum hydroxide
Functionally graded material
Pulse current pressure sintering
Seeding

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.2464/jilm.52.471

Cite this

@article{2325ddda92fb413089590c781721efd4,

title = "Fabrication of functionally graded Al/Al2O3 materials using pulse current pressure sintering process",

abstract = "To fabricate densified Al/Al2O3 functionally graded materials (FGM) on hardness and thermal expansion, a pulse current pressure sintering process was employed. This FGM consists of an aluminum layer, an α-Al2O3 layer and 7 inter layers between them. As a starting material, aluminum and Al(OH)3 powders were used. Results obtained were as follows. (1) Temperature of an upper punch which directly contact with Al2O3 layer reached about 1800 K when the mold temperature reached about 870 K of holding temperature. (2) Mechanical grinding of powder mixture of Al(OH)3 and 20 mass% α-Al2O3 reduced the transformation temperature of Al(OH)3 to α-Al2O3 by 300 K. (3) The hardness of inter layers gradually increased as the volume fraction of γ-Al2O3 increased. Top layer which consists of α-Al2O3 was about 1000 HV in average and the surface of this layer reached 1500 HV.",

keywords = "Alumina, Aluminum hydroxide, Functionally graded material, Pulse current pressure sintering, Seeding",

author = "Takekazu Nagae and Mai Mizubayashi and Masaru Yokota and Masateru Nose and Tomoaki Ishiguro and Shigeoki Saji",

year = "2002",

month = oct,

doi = "10.2464/jilm.52.471",

language = "英語",

volume = "52",

pages = "471--476",

journal = "Keikinzoku/Journal of Japan Institute of Light Metals",

issn = "0451-5994",

publisher = "Keikinzoku Gakkai/Japan Institute of Light Metals",

number = "10",

}

TY - JOUR

T1 - Fabrication of functionally graded Al/Al2O3 materials using pulse current pressure sintering process

AU - Nagae, Takekazu

AU - Mizubayashi, Mai

AU - Yokota, Masaru

AU - Nose, Masateru

AU - Ishiguro, Tomoaki

AU - Saji, Shigeoki

PY - 2002/10

Y1 - 2002/10

N2 - To fabricate densified Al/Al2O3 functionally graded materials (FGM) on hardness and thermal expansion, a pulse current pressure sintering process was employed. This FGM consists of an aluminum layer, an α-Al2O3 layer and 7 inter layers between them. As a starting material, aluminum and Al(OH)3 powders were used. Results obtained were as follows. (1) Temperature of an upper punch which directly contact with Al2O3 layer reached about 1800 K when the mold temperature reached about 870 K of holding temperature. (2) Mechanical grinding of powder mixture of Al(OH)3 and 20 mass% α-Al2O3 reduced the transformation temperature of Al(OH)3 to α-Al2O3 by 300 K. (3) The hardness of inter layers gradually increased as the volume fraction of γ-Al2O3 increased. Top layer which consists of α-Al2O3 was about 1000 HV in average and the surface of this layer reached 1500 HV.

AB - To fabricate densified Al/Al2O3 functionally graded materials (FGM) on hardness and thermal expansion, a pulse current pressure sintering process was employed. This FGM consists of an aluminum layer, an α-Al2O3 layer and 7 inter layers between them. As a starting material, aluminum and Al(OH)3 powders were used. Results obtained were as follows. (1) Temperature of an upper punch which directly contact with Al2O3 layer reached about 1800 K when the mold temperature reached about 870 K of holding temperature. (2) Mechanical grinding of powder mixture of Al(OH)3 and 20 mass% α-Al2O3 reduced the transformation temperature of Al(OH)3 to α-Al2O3 by 300 K. (3) The hardness of inter layers gradually increased as the volume fraction of γ-Al2O3 increased. Top layer which consists of α-Al2O3 was about 1000 HV in average and the surface of this layer reached 1500 HV.

KW - Alumina

KW - Aluminum hydroxide

KW - Functionally graded material

KW - Pulse current pressure sintering

KW - Seeding

UR - http://www.scopus.com/inward/record.url?scp=0036815903&partnerID=8YFLogxK

U2 - 10.2464/jilm.52.471

DO - 10.2464/jilm.52.471

M3 - 学術論文

AN - SCOPUS:0036815903

SN - 0451-5994

VL - 52

SP - 471

EP - 476

JO - Keikinzoku/Journal of Japan Institute of Light Metals

JF - Keikinzoku/Journal of Japan Institute of Light Metals

IS - 10

ER -