Fabrication of a Thick Crystalline Al2O3 Coating with Insulation and High Thermal Conductivity via Anodic Oxidation and Subsequent Mic Arc Discharge Treatment

被引：6

作者：

Song, Wei ^{[1
,2
]}

Jiang, Bailing ^{[1
]}

Ji, Dongdong ^{[1
]}

机构：

[1] Xian Univ Technol, Fac Mat Sci & Engn, 5 South Jinhua Rd, Xian 710048, Peoples R China

[2] Nanyang Inst Technol, Sch Biol & Chem Engn, 80 Changjiang Rd, Nanyang 473004, Peoples R China

来源：

COATINGS | 2020年 / 10卷 / 01期

基金：

中国国家自然科学基金;

关键词：

amorphous Al2O3; crystalline Al2O3; plasma discharging; insulation; thermal conductivity; PRINTED-CIRCUIT BOARD; ELECTROLYTE TEMPERATURE; HEAT DISSIPATION; ALUMINUM; PERFORMANCE; LAYER; MICROSTRUCTURE; POWER; FILM;

D O I：

10.3390/coatings10010038

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Amorphous Al2O3 coating with a thickness of 143 mu m was firstly prepared by anodic oxidation, then the amorphous Al2O3 was transformed into crystalline Al2O3 through applying micro arc discharge. The crystal structure of the Al2O3 coatings was analyzed with an X-ray diffractometer. Results indicated that the coating consisted of amorphous and crystalline Al2O3. The microstructure of the coating was characterized by scanning electron microscopy, which showed that the coating had a compact structure. The thermal conductivity of the coating was 23.7 W/m center dot K, which is significantly higher than that of amorphous Al2O3 coating. The total and specific breakdown voltages of the coating were 3.85 kV and 26.92 kV/mm, which is suitable to apply for high power LED heat sink substrate.

引用

页数：15

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