Crack Healing of Nano-Ni/Al2O3 Hybrid Materials via High-Temperature Oxidation

被引：11

作者：

Maruoka, Daisuke ^{[1
]}

Nanko, Makoto ^{[2
]}

机构：

[1] Nagaoka Univ Technol, Grad Sch Engn, 1603-1 Kamitomioka, Nagaoka, Niigata 9402188, Japan

[2] Nagaoka Univ Technol, Dept Engn Mech, Nagaoka, Niigata 9402186, Japan

来源：

HIGH-TEMPERATURE OXIDATION AND CORROSION 2010 | 2011年 / 696卷

基金：

日本学术振兴会;

关键词：

Al2O3; Nanocomposite; High temperature oxidation resistance; Crack healing; Bending strength; Pulsed electric current sintering; Grain boundary diffusion; CREEP RESISTANCE; ALUMINA; COMPOSITES; DIFFUSION; BEHAVIOR; YTTRIUM;

D O I：

10.4028/www.scientific.net/MSF.696.378

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Crack-healing effectiveness was investigated on 5 vol% nano-Ni dispersed Al2O3 hybrid materials. Influence of the Y or Si doping or SiC co-dispersion was also studied on the crack healing behavior. Cracks were introduced by a Vickers indentation to be a crack length of approximately 60 mu m. Cracks of nano-Ni/Al2O3 were completely disappeared, for example, by oxidation at 1200 degrees C for 6 h in air, Y/Si doped one and SiC co-dispersed one have similar performance of crack disappearance. Bending strength of crack-disappeared samples showed about 550 MPa and was comparable or improved with that of as-sintered one. Mechanism of crack healing was considered as filling up of cracks by NiAl2O4 oxidation product which is developed by outward diffusion of cations at grain boundary of Al2O3 matrix. Nano-Ni/Al2O3 with Y or Si doping or SiC co-dispersion are realized to have crack-healing effectiveness with improved high-temperature oxidation resistance.

引用

页码：378 / +

页数：2

共 18 条

[1] Possibility of enhanced strength and self-recovery of surface damages of ceramics composites under oxidative conditions [J].

Abe, O ;

Ohwa, Y ;

Kuranobu, Y .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2006, 26 (4-5) :689-695

[2] Oxidation of NiAl/Al2O3 composites for controlled development of surface layers and toughening [J].

Abe, O ;

Ohwa, Y .

SOLID STATE IONICS, 2004, 172 (1-4) :553-556

[3]

AWAJI H, 2001, STRENGTH CERAMIC MAT

[4] Grain boundary strengthening in alumina by rare earth impurities [J].

Buban, JP ;

Matsunaga, K ;

Chen, J ;

Shibata, N ;

Ching, WY ;

Yamamoto, T ;

Ikuhara, Y .

SCIENCE, 2006, 311 (5758) :212-215

[5] The effect of yttrium on oxygen grain-boundary transport in polycrystalline alumina measured using Ni marker particles [J].

Cheng, Huikai ;

Dillon, Shen J. ;

Caram, Hugo S. ;

Rickman, Jeffrey M. ;

Chan, Helen M. ;

Harmer, Martin P. .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2008, 91 (06) :2002-2008

[6]

CHU MC, 1995, FATIGUE FRACT ENG M, V18, P1019, DOI 10.1111/j.1460-2695.1995.tb00924.x

[7] Crack-Healing Effectiveness of Nano Ni plus SiC Co-Dispersed Alumina Hybrid Materials [J].

Maruoka, Daisuke ;

Sato, Yoku ;

Nanko, Makoto .

THERMEC 2009 SUPPLEMENT: 6TH INTERNATIONAL CONFERENCE ON PROCESSING & MANUFACTURING OF ADVANCED MATERIALS, 2010, 89-91 :365-+

[8] Influence of Si-Doping of Nano-Ni Dispersed Al2O3 Composites on High-Temperature Oxidation [J].

Maruoka, Daisuke ;

Nanko, Makoto .

MATERIALS TRANSACTIONS, 2010, 51 (09) :1570-1573

[9] Yttrium doping effect on oxygen grain boundary diffusion in α-Al2O3 [J].

Nakagawa, Tsubasa ;

Sakaguchi, Isao ;

Shibata, Naoya ;

Matsunaga, Katsuyuki ;

Mizoguchi, Teruyasu ;

Yamamoto, Takahisa ;

Haneda, Hajime ;

Ikuhara, Yuichi .

ACTA MATERIALIA, 2007, 55 (19) :6627-6633

[10]

Nakao W., 2009, SELF HEALING MAT FUN

← 1 2 →