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

Autor:	Masaru Yokota, Tomoaki Ishiguro, Shigeoki Saji, Mai Mizubayashi, Masateru Nose, Takekazu Nagae
Rok vydání:	2002
Předmět:	Materials science Fabrication Mechanical Engineering Metals and Alloys Sintering chemistry.chemical_element Functionally graded material Thermal expansion chemistry Mechanics of Materials Aluminium Volume fraction Materials Chemistry Composite material Layer (electronics) Powder mixture
Zdroj:	Journal of Japan Institute of Light Metals. 52:471-476
ISSN:	1880-8018 0451-5994
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3007c9bfede210bc69b7b294fd56bea6 https://doi.org/10.2464/jilm.52.471 Zobrazit plný text záznamu