The optimization of processing parameters used to form aluminum oxide-styrene acrylate composite capacitors
The dielectric characteristics, thickness and the glass transition temperature of composite dielectric coatings containing electrophoretically deposited styrene acrylate plus anodically formed aluminum oxide can be altered by varying the processing conditions. The processing conditions varied here include: (1) the nature of the anodic aluminum oxide (barrier vs porous Al/sub 2/O/sub 3/), (2) the thickness of the aluminum oxide, and (3) the curing temperature. Useful dielectric properties are observed for composites comprising porous aluminum oxide. At 20/degree/C in lab air, the best dielectric breakdown strengths are observed for styrene acrylate coatings which are deposited on intermediate thickness (0.3--0.5 ..mu..m) of barrier aluminum oxide. Curing at temperatures from 180--220/degree/C (30 min.) results in good dielectric integrity. Optical micrographs show that an electrophoretically-deposited styrene acrylate coating is absorbed into porous aluminum oxide. If the styrene acrylate deposited is not adequate to fill all of the pores, then the film thickness is that of the porous alumina. However, after the pores are filled, then the additional styrene acrylate will add to the total thickness of the dielectric. The glass transition temperature of the polymer coating can be varied from approximately 40/degree/C to 160/degree/C by varying the curing temperature over a range from 160/degree/C to 280/degree/C. 4 refs., 6 figs., 1 tab.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6505640
- Report Number(s):
- SAND-88-3181; ON: DE89007532
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
ACRYLATES
DIELECTRIC PROPERTIES
ALUMINIUM OXIDES
STYRENE
CAPACITORS
CURING
DEPOSITION
GLASS
POROSITY
PROCESSING
TEMPERATURE EFFECTS
THICKNESS
TRANSITION TEMPERATURE
ALKYLATED AROMATICS
ALUMINIUM COMPOUNDS
AROMATICS
CARBOXYLIC ACID SALTS
CHALCOGENIDES
DIMENSIONS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
EQUIPMENT
HYDROCARBONS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
360603* - Materials- Properties
360602 - Other Materials- Structure & Phase Studies
360601 - Other Materials- Preparation & Manufacture
420800 - Engineering- Electronic Circuits & Devices- (-1989)