Dielectric particle processing for ultracapacitance
First Claim
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1. A composition of matter comprising:
- a) 60-80% by weight BaTiO3 particles coated with a 3-20 nm film of SiO2 or a 3-10 nm thick film of Al2O3;
said BaTiO3 particles having an average grain diameter of 100-700 nm;
said BaTiO3 having doubly ionized oxygen anion vacancies;
b) 5-50% by weight high dielectric constant glass;
said high dielectric constant glass being 1-10 μ
m in size;
c) 0.1-5% by weight surfactant;
d) 5-25% by weight solvent; and
e) 5-25% by weight organic vehicle.
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Abstract
An ink of the formula: 60-80% by weight BaTiO3 particles coated with SiO2; 5-50% by weight high dielectric constant glass; 0.1-5% by weight surfactant; 5-25% by weight solvent; and 5-25% weight organic vehicle. Also a dielectric made by: heating particles of BaTiO3 for a special heating cycle, under a mixture of 70-96% by volume N2 and 4-30% by volume H2 gas; depositing a film of SiO2 over the particles; mechanically separating the particles; forming them into a layer; and heating at 850-900° C. for less than 5 minutes and allowing the layer to cool to ambient temperature in N2 atmosphere.
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Citations
12 Claims
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1. A composition of matter comprising:
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a) 60-80% by weight BaTiO3 particles coated with a 3-20 nm film of SiO2 or a 3-10 nm thick film of Al2O3;
said BaTiO3 particles having an average grain diameter of 100-700 nm;
said BaTiO3 having doubly ionized oxygen anion vacancies;b) 5-50% by weight high dielectric constant glass;
said high dielectric constant glass being 1-10 μ
m in size;c) 0.1-5% by weight surfactant; d) 5-25% by weight solvent; and e) 5-25% by weight organic vehicle. - View Dependent Claims (2, 3, 4, 5)
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6. A dielectric made by the process of:
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a) obtaining BaTiO3 particles;
said particles having an average grain diameter of 100-700 nm;b) treating said particles in a first furnace under a mixture of 70-96% by volume N2 and 4-30% by volume H2 gas for 60-90 minutes at 850-900°
C.;c) coating said treated particles with a 3-20 nm thick film of SiO2 or a 3-10 nm thick film of Al2O3 whereby said coated treated particles become agglomerated; d) separating said coated, treated particles to break up said agglomeration into individual particles; e) forming said particles into a layer of sufficient thickness to produce a sintered layer 10-35 μ
m thick; andf) sintering said layer by heating in a second furnace, at 850-900°
C. for less than 5 minutes and allowing it to cool to ambient temperature under N2 atmosphere;
said N2 containing less than 25 ppm O2. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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Specification