Single and multilayer coatings containing aluminum nitride
First Claim
1. A process for the formation of an aluminum nitride ceramic or ceramic-like coating on a substrate comprising the steps of:
- (a) coating said substrate with a liquid containing an alkylaluminum amide having the formula (R2 AlNH2)3, where R is an alkyl group containing from 1 to 4 carbon atoms;
(b) drying said liquid and thereby depositing a preceramic coating on said substrate; and
(c) ceramifying said preceramic coating to an aluminum nitride-containing ceramic by heating said preceramic coating to a temperature of between about 400°
to about 1000°
C. in the presence of ammonia.
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Accused Products
Abstract
Ceramic or ceramic-like single, two, or multilayer coatings having aluminum nitride as one of the layers are provided, including methods for the preparation of such coatings which produce planarizing, passivating and hermetic barrier coatings on temperature sensitive substrates such as semiconductors and electronic devices. The aluminum nitride ceramic or ceramic-like coating is provided by applying a liquid alkylaluminum amide having the formula (R2 AlNH2)3, where R is an alkyl group containing from 1 to 4 carbon atoms, neat or diluted in an organic solvent. The liquid coating is then dried, followed by heating the coating to a temperature of between about 400° to about 100° C. in the presence of ammonia to produce an aluminum nitride-containing ceramic coating.
47 Citations
34 Claims
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1. A process for the formation of an aluminum nitride ceramic or ceramic-like coating on a substrate comprising the steps of:
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(a) coating said substrate with a liquid containing an alkylaluminum amide having the formula (R2 AlNH2)3, where R is an alkyl group containing from 1 to 4 carbon atoms; (b) drying said liquid and thereby depositing a preceramic coating on said substrate; and (c) ceramifying said preceramic coating to an aluminum nitride-containing ceramic by heating said preceramic coating to a temperature of between about 400°
to about 1000°
C. in the presence of ammonia. - View Dependent Claims (2, 3, 4, 5)
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6. A process for the formation of a multilayer ceramic or ceramic-like protective coating on a substrate comprising the steps of:
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(I) (a) coating said substrate with a planarizing coating comprising a liquid containing an alkylaluminum amide having the formula (R2 AlNH2)3, where R is an alkyl group containing from 1 to 4 carbon atoms; (b) drying said liquid and thereby depositing a preceramic coating on said substrate; and (c) ceramifying said preceramic coating to an aluminum nitride-containing ceramic by heating said preceramic coating to a temperature of between about 400°
to about 1000°
C. in the presence of ammonia to form said planarizing coating;(II) applying to said planarizing coating a passivating coating selected from the group consisting of (i) a silicon nitrogen-containing coating, (ii) a silicon carbon-containing coating, and (iii) a silicon carbon nitrogen-containing coating; and (III) applying to said passivating coating a protective coating selected from the group consisting of (i) a silicon-containing coating, (ii) a silicon nitrogen-containing coating, (iii) a silicon carbon-containing coating, and (iv) a silicon carbon nitrogen-containing coating, whereby a multilayer ceramic or ceramic-like coating on said substrate is obtained. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A process for the formation of a multilayer ceramic or ceramic-like protective coating on a substrate comprising the steps of:
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(I) coating said substrate with a planarizing coating of a silicon dioxide containing ceramic or ceramic-like composition; (II) (a) applying to said planarizing coating a passivating coating comprising a liquid containing an alkylaluminum amide having the formula (R2 AlNH2)3, where R is an alkyl group containing from 1 to 4 carbon atoms; (b) drying said liquid and thereby depositing a preceramic coating on said substrate; and (c) ceramifying said preceramic coating to an aluminum nitride-containing ceramic by heating said preceramic coating to a temperature of between about 400°
to about 1000°
C. in the presence of ammonia to form said passivating coating; and(III) applying to said passivating coating a protective coating selected from the group consisting of (i) a silicon-containing coating, (ii) a silicon nitrogen-containing coating, (iii) a silicon carbon-containing coating, and (iv) a silicon carbon nitrogen-containing coating, whereby a multilayer ceramic or ceramic-like coating on said substrate is obtained. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A process for the formation of a multilayer ceramic or ceramic-like protective coating on a substrate comprising the steps of:
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(I) coating said substrate with a planarizing coating of a silicon dioxide containing ceramic or ceramic-like composition; (II) (a) applying to said planarizing coating a passivating coating selected from the group consisting of (i) a silicon nitrogen-containing coating, (ii) a silicon carbon-containing coating, and (iii) a silicon carbon nitrogen-containing coating; and (III) applying to said passivating coating a protective coating of aluminum nitride by the chemical vapor deposition of a preceramic composition containing an alkylaluminum amide having the formula (R2 AlNH2)3, where R is an alkyl group containing from 1 to 4 carbon atoms at a temperature of between about 400°
to about 1000°
C. in the presence of ammonia to form said protective coating. - View Dependent Claims (19, 20, 21)
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22. A process for the formation of a multilayer ceramic or ceramic-like protective coating on a substrate comprising the steps of:
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(I) coating said substrate with an initial coating of a ceramic or ceramic-like composition selected from the group consisting of (i) a silicon nitrogen-containing coating, (ii) a silicon carbon-containing coating, and (iii) a silicon carbon nitrogen-containing coating and; (II) (a) applying to said initial coating a passivating coating comprising a liquid containing an alkylaluminum amide having the formula (R2 AlNH2)3, where R is an alkyl group containing from 1 to 4 carbon atoms; (b) drying said liquid and thereby depositing a preceramic coating on said substrate; and (c) ceramifying said preceramic coating to an aluminum nitride-containing ceramic by heating said preceramic coating to a temperature of between about 400°
to about 1000°
C. in the presence of ammonia to form said passivating coating; and(III) applying to said passivating coating a protective coating selected from the group consisting of (i) a silicon-containing coating, (ii) a silicon nitrogen-containing coating, (iii) a silicon carbon-containing coating, and (iv) a silicon carbon nitrogen-containing coating, whereby a multilayer ceramic - View Dependent Claims (23, 24, 25, 26)
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27. A process for the formation of a two layer ceramic or ceramic-like coating on a substrate comprising the steps of:
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(I) (a) coating said substrate with a planarizing coating comprising a liquid containing an alkylaluminum amide having the formula (R2 AlNH2)3, where R is an alkyl group containing from 1 to 4 carbon atoms; (b) drying said liquid and thereby depositing a preceramic coating on said substrate; and (c) ceramifying said preceramic coating to an aluminum nitride-containing ceramic by heating said preceramic coating to a temperature of between about 400°
to about 1000°
C. in the presence of a ammonia to form said planarizing coating; and(II) applying to said planarizing coating a passivating coating selected from the group consisting of (i) silicon nitrogen-containing coating, (ii) a silicon-containing coating, (iii) a silicon nitrogen-containing coating, and (iv) a silicon carbon nitrogen-containing coating, whereby a two layer ceramic or ceramic-like coating is obtained. - View Dependent Claims (28, 29, 30, 31)
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32. A process for the formation of a two layer ceramic or ceramic-like protective coating on a substrate comprising the steps of:
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(I) coating said substrate with a planarizing coating of a silicon dioxide containing ceramic or ceramic-like composition; and (II) applying to said passivating coating a protective coating of aluminum nitride by the chemical vapor deposition of a preceramic composition containing an alkylaluminum amide having the formula (R2 AlNH2)3, where R is an alkyl group containing from 1 to 4 carbon atoms at a temperature of between about 400°
to about 1000°
C. in the presence of ammonia to form said protective coating. - View Dependent Claims (33, 34)
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Specification