等离子喷涂超细氧化铝-3wt%氧化钛涂层的电学性能研究

无机材料学报

等离子喷涂超细氧化铝-3wt%氧化钛涂层的电学性能研究

林新华; 周霞明; 黄静琪; 丁传贤

中国科学院上海硅酸盐研究所上海 200050

收稿日期:2003-05-08 修回日期:2003-08-21 出版日期:2004-05-20 网络出版日期:2004-05-20

Electrical Properties of Nanostructured Al₂O₃-3wt% TiO₂ Coating Deposited by Plasma Spraying Deposited by Plasma Spraying

LIN Xin-Hua; ZHOU Xia-Ming; HUANG Jing-Qi; DING Chuan-Xian

Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China

Received:2003-05-08 Revised:2003-08-21 Published:2004-05-20 Online:2004-05-20

摘要/Abstract

摘要： 采用大气等离子喷涂系统,制备了常规和超细Al₂O₃-3wt％TiO₂涂层.利用 X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)对涂层相组成和显微结构进行了表征.测量了涂层直流电阻,介电常数和介电损耗.在等离子喷涂过程中,α-Al₂O₃氧化铝大部分转变为γ-Al₂O₃.氧化钛在常规涂层中主要以非计量的Ti₂O₃形式存在;对于超细涂层,氧化钛与氧化铝反应形成固溶体.常规Al₂O₃-3wt％TiO₂涂层呈现典型的板条层结构,而超细Al₂O₃-3wt％TiO2涂层除了具有板条层外,还含有大量的等轴α-Al₂O₃晶粒,其尺寸在150～800nm之间,在常规涂层中,组成板条层的柱状γ-Al₂O₃晶粒直径约为700nm;而对于超细涂层,其绝大部分<200nm.与常规Al₂O₃-3wt％TiO₂涂层相比,超细Al₂O₃-3wt％TiO₂涂层具有较高的直流电阻;但在相同频率下,超细涂层介电常数和介电损耗都较常规涂层小.

关键词: 等离子喷涂, 氧化铝-氧化钛涂层, 超细晶粒, 电学性能

Abstract: 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 γ-Al₂O₃ with some α-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 α-Al₂O₃ grains besides splat lamellae were also observed.
The size of equiaxed α-Al₂O₃ grains was about 150～800nm. 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.

Key words: plasma spraying, Al₂O₃-TiO₂ coating, nanostructure, electrical properties

中图分类号:

TQ174

林新华,周霞明,黄静琪,丁传贤. 等离子喷涂超细氧化铝-3wt%氧化钛涂层的电学性能研究[J]. 无机材料学报.

LIN Xin-Hua,ZHOU Xia-Ming,HUANG Jing-Qi,DING Chuan-Xian. Electrical Properties of Nanostructured Al₂O₃-3wt% TiO₂ Coating Deposited by Plasma Spraying Deposited by Plasma Spraying[J]. Journal of Inorganic Materials.

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