Electrical properties of nanostructured Al2O3-3wt% TiO2 coating deposited by plasma spraying

被引：0

作者：

Lin, XH ^{[1
]}

Zhou, XM ^{[1
]}

Huang, JQ ^{[1
]}

Ding, CX ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China

来源：

JOURNAL OF INORGANIC MATERIALS | 2004年 / 19卷 / 03期

关键词：

plasma spraying; Al2O3-TiO2; coating; nanostructure; electrical properties;

D O I：

暂无

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Conventional and nanostructured Al2O3-3wt%TiO2 coatings were deposited by plasma spraying with conventional and nanostructured powders, respectively. The phase compositions and microstructure of the as-spraying coatings were characterized by XRD, SEM and TEM. The electrical resistivity, dielectric constant and dielectric loss of coatings were measured. In both conventional and nanostructured Al2O3-3wt%TiO2 coatings, alumina mainly existed in the form of gamma-Al2O3 with some alpha-Al2O3. Non-stoichiometric Ti2O3 was found in the conventional coating; while in the nanostructured coating, titania reacted with alumina to form solid solution. The conventional Al2O3-3wt%TiO2 coating exhibited a typical splat microstructure. For the nanostructured Al2O3-3wt%TiO2 coating, many equiaxed alpha-Al2O3 grains besides splat lamellae were also observed. The size of equiaxed alpha-Al2O3 grains was about 150similar to800nm. Compared to the conventional Al2O3-3wt%TiO2 coating, electrical resistivity of the nanostructured Al2O3-3wt%TiO2 coating increased. But the nanostructured coating exhibited lower dielectric constant and dielectric loss.

引用

页码：623 / 628

页数：6

共 13 条

[1]

Chen H, 2002, J INORG MATER, V17, P882

[2]

CHRASKA P, 1992, J THERM SPRAY TECHN, V1, P301

[3] Microstructure development of Al2O3-13wt.%TiO2 plasma sprayed coatings derived from nanocrystalline powders [J].

Goberman, D ;

Sohn, YH ;

Shaw, L ;

Jordan, E ;

Gell, M .

ACTA MATERIALIA, 2002, 50 (05) :1141-1152

[4] A review on nanostructured WC-Co coatings [J].

He, JH ;

Schoenung, JM .

SURFACE & COATINGS TECHNOLOGY, 2002, 157 (01) :72-79

[5] Plasma-sprayed nanostructured Al2O3/TiO2 powders and coatings [J].

Kear, BH ;

Kalman, Z ;

Sadangi, RK ;

Skandan, G ;

Colaizzi, J ;

Mayo, WE .

JOURNAL OF THERMAL SPRAY TECHNOLOGY, 2000, 9 (04) :483-487

[6] The effects of sealing on the mechanical properties of the plasma-sprayed alumina-titania coating [J].

Kim, HJ ;

Lee, CH ;

Kweon, YG .

SURFACE & COATINGS TECHNOLOGY, 2001, 139 (01) :75-80

[7]

LAU ML, 1998, J THERM SPRAY TECHN, V7, P436

[8] Characterization of alumina-3 wt.% titania coating prepared by plasma spraying of nanostructured powders [J].

Lin, XH ;

Zeng, Y ;

Lee, SW ;

Ding, CX .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2004, 24 (04) :627-634

[9] ON THE FORMATION OF THERMALLY SPRAYED ALUMINA COATINGS [J].

MCPHERSON, R .

JOURNAL OF MATERIALS SCIENCE, 1980, 15 (12) :3141-3149

[10]

Niemi K., 1994, J. Therm. Spray Technol, V3, P199, DOI [10.1007/BF02646266, 10.1007/BF02648279, DOI 10.1007/BF02648279]

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