US4530853A
Expired / Lapsed
US
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Non-conducting oxidation retardant coating composition for carbon and graphite
Assignee: GREAT LAKES CARBON Corp
•
Filing: 1984-06-06
•
Granted: 1985-07-23
•
Expires: 2004-06-06
Abstract
Abstract A multiple coating composition is utilized to provide oxidation resistance for carbon or graphite articles during use in high temperature environments. A method for applying the composition is also provided.
Inventors
- 👤 Steve F. Lewallen
- 👤 Billy J. Lewis
- 👤 James R. McIver
- 👤 Robert E. Hoss
- 👤 Edward W. Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:39
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
130 words
A method for applying an electrically non-conducting multiple protective coating composition to a carbon or graphite body comprising: (a) applying a first coating of a sprayable aqueous slurry of a high temperature cement consisting principally of a mixture of about 55-65 wt. % SiO 2 , about 25-35 wt. % Al 2 O 3 and about 5-15 wt. % Na 2 SiO 3 ; (b) drying said first coating; (c) applying a second coating over said first coating of an aqueous slurry comprising: (1) a mixture consisting of about 85-100 wt. % SiC, 0-15 wt. % graphite and 0-15 wt. % SiO 2 , (2) B 2 O 3 , (3) Na 2 SiO 3 and (4) NH 4 H 2 PO 4 ; and (d) drying said second coating.
Claim 2
Independent Claim
130 words
A method for applying an electrically non-conducting multiple protective coating composition to a carbon or graphite body comprising: (a) applying a first coating of a sprayable aqueous slurry of a high temperature cement consisting principally of a mixture of about 55-65 wt. % SiO 2 , about 25-35 wt. % Al 2 O 3 and about 5-15 wt. % Na 2 SiO 3 ; (b) drying said first coating; (c) applying a second coating over said first coating of an aqueous slurry comprising: (1) a mixture consisting of about 85-100 wt. % SiC, 0-15 wt. % graphite and 0-15 wt. % SiO 2 , (2) B 2 O 3 , (3) Na 2 SiO 3 and (4) NH 4 H 2 PO 4 ; and (d) drying said second coating.
Claim 3
Dependent Claim
35 words
The method of claim 1 wherein said first coating is applied to a thickness of about 0.5 to 1.5 mm. and said second coating is applied to a thickness of about 0.5 to 1.0 mm.
Claim 4
Dependent Claim
80 words
The method of claim 1 wherein said second coating consists of approximately, in parts by weight: (1) 200 to 400 parts water, (2) 100 to 130 parts of a mixture consisting of about 85-100 wt. % SiC, 0-15 wt. % graphite and 0-15 wt. % SiO 2 , (3) 30 to 100 parts B 2 O 3 , (4) 1 to 5 parts Na 2 SiO 3 and (5) 1 to 3 parts NH 4 H 2 PO 4 .
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein a waterproofing agent is applied to the coated body.
Claim 6
Dependent Claim
11 words
The method of claim 4 wherein the waterproofing agent is paraffin.
Claim 7
Independent Claim
144 words
A method for applying an electrically non-conducting multiple protective coating composition to a carbon or graphite body comprising: (a) applying a first coating of a aqueous slurry of a high temperature cement consisting of a mixture of 59.5 wt. % SiO 2 , 30 wt. % Al 2 O 3 and 10.5 wt. % Na 2 SiO 3 ; (b) drying said first coating; (c) applying a second coating over said first coating of an aqueous slurry consisting of approximately, in parts by weight: (1) 300 parts water, (2) 110 parts of a mixture consisting of about 90 wt. % SiC, 5 wt. % graphite and 5 wt. % SiO 2 , (3) 80 parts B 2 O 3 , (4) 4 parts Na 2 SiO 3 and (5) 2 parts NH 4 H 2 PO 4 ; and (d) drying said second coating.
Claim 8
Independent Claim
144 words
A method for applying an electrically non-conducting multiple protective coating composition to a carbon or graphite body comprising: (a) applying a first coating of a aqueous slurry of a high temperature cement consisting of a mixture of 59.5 wt. % SiO 2 , 30 wt. % Al 2 O 3 and 10.5 wt. % Na 2 SiO 3 ; (b) drying said first coating; (c) applying a second coating over said first coating of an aqueous slurry consisting of approximately, in parts by weight: (1) 300 parts water, (2) 110 parts of a mixture consisting of about 90 wt. % SiC, 5 wt. % graphite and 5 wt. % SiO 2 , (3) 80 parts B 2 O 3 , (4) 4 parts Na 2 SiO 3 and (5) 2 parts NH 4 H 2 PO 4 ; and (d) drying said second coating.
Claim 9
Dependent Claim
15 words
The method of claim 6 wherein a waterproofing agent is applied to the coated body.
Claim 10
Dependent Claim
12 words
The method of claim 7 wherein the waterproofing agent is paraffin. PG,12
Claim 11
Independent Claim
22 words
The method of claims 1, 3, 4, 5, 6, 7 or 8 wherein said first coating composition is applied in two stages.
Claim 12
Dependent Claim
37 words
The method of claim 9 wherein said first coating is initially applied to a thickness of about 0.1 to 0.5 mm., dried, then applied in an additional stage to a thickness of about 0.5 to 1.0 mm.
Claim 13
Independent Claim
166 words
A method for applying an electrically non-conducting multiple protective coating composition to a carbon or graphite body comprising: (a) applying an initial-stage first coating of a aqueous slurry of a high temperature cement consisting of a mixture of 59.5 wt. % SiO 2 , 30 wt. % Al 2 O 3 and 10.5 wt. % Na 2 SiO 3 ; (b) drying said initial-stage first coating; (c) applying an additional-stage first coating of the slurry of (a) over said initial-stage first coating; (d) drying said additional-stage first coating; (e) applying a second coating over the two-stage first coating of an aqueous slurry consisting of approximately, in parts by weight: (1) 300 parts water, (2) a mixture consisting of about 90 wt. % SiC, 5 wt. % graphite and 5 wt. % SiO 2 , (3) 80 parts B 2 O 3 , (4) 4 parts Na 2 SiO 3 and (5) 2 parts NH 4 H 2 PO 4 ; and (f) drying said second coating.
Claim 14
Independent Claim
166 words
A method for applying an electrically non-conducting multiple protective coating composition to a carbon or graphite body comprising: (a) applying an initial-stage first coating of a aqueous slurry of a high temperature cement consisting of a mixture of 59.5 wt. % SiO 2 , 30 wt. % Al 2 O 3 and 10.5 wt. % Na 2 SiO 3 ; (b) drying said initial-stage first coating; (c) applying an additional-stage first coating of the slurry of (a) over said initial-stage first coating; (d) drying said additional-stage first coating; (e) applying a second coating over the two-stage first coating of an aqueous slurry consisting of approximately, in parts by weight: (1) 300 parts water, (2) a mixture consisting of about 90 wt. % SiC, 5 wt. % graphite and 5 wt. % SiO 2 , (3) 80 parts B 2 O 3 , (4) 4 parts Na 2 SiO 3 and (5) 2 parts NH 4 H 2 PO 4 ; and (f) drying said second coating.
Claim 15
Dependent Claim
15 words
The method of claim 11 wherein a waterproofing agent is applied to the coated body.
Claim 16
Dependent Claim
11 words
The method of claim 12 wherein the waterproofing agent is paraffin.
Claim 17
Independent Claim
135 words
A method for applying an electrically non-conducting multiple protective coating composition to a carbon or graphite body comprising: (a) applying a first coating of a sprayable aqueous slurry of a mixture of aluminum metal and high temperature cement consisting principally of a mixture of about 55-65 wt. % SiO 2 , about 25-35 wt. % Al 2 O 3 and about 5-15 wt. % Na 2 SiO 3 ; (b) drying said first coating; (c) applying a second coating over said first coating of an aqueous slurry comprising: (1) a mixture consisting of about 85-100 wt. % SiC, 0-15 wt. % graphite and 0-15 wt. % SiO 2 , (2) B 2 O 3 , (3) Na 2 SiO 3 and (4) NH 4 H 2 PO 4 ; and (d) drying said second coating.
Claim 18
Independent Claim
135 words
A method for applying an electrically non-conducting multiple protective coating composition to a carbon or graphite body comprising: (a) applying a first coating of a sprayable aqueous slurry of a mixture of aluminum metal and high temperature cement consisting principally of a mixture of about 55-65 wt. % SiO 2 , about 25-35 wt. % Al 2 O 3 and about 5-15 wt. % Na 2 SiO 3 ; (b) drying said first coating; (c) applying a second coating over said first coating of an aqueous slurry comprising: (1) a mixture consisting of about 85-100 wt. % SiC, 0-15 wt. % graphite and 0-15 wt. % SiO 2 , (2) B 2 O 3 , (3) Na 2 SiO 3 and (4) NH 4 H 2 PO 4 ; and (d) drying said second coating.
Claim 19
Dependent Claim
35 words
The method of claim 14 wherein said first coating is applied to a thickness of about 0.5 to 1.5 mm. and said second coating is applied to a thickness of about 0.5 to 1.0 mm.
Claim 20
Dependent Claim
80 words
The method of claim 14 wherein said second coating consists of approximately, in parts by weight: (1) 200 to 400 parts water, (2) 100 to 130 parts of a mixture consisting of about 85-100 wt. % SiC, 0-15 wt. % graphite and 0-15 wt. % SiO 2 , (3) 30 to 100 parts B 2 O 3 , (4) 1 to 5 parts Na 2 SiO 3 and (5) 1 to 3 parts NH 4 H 2 PO 4 .
Claim 21
Dependent Claim
25 words
The method of claim 14 wherein said first coating consists of about 20 wt. % aluminum metal and about 80 wt. % high temperature cement.
Claim 22
Dependent Claim
15 words
The method of claim 14 wherein a waterproofing agent is applied to the coated body.
Claim 23
Dependent Claim
11 words
The method of claim 18 wherein the waterproofing agent is paraffin.
Claim 24
Independent Claim
159 words
A method for applying an electrically non-conducting multiple protective coating composition to a carbon or graphite body comprising: (a) applying a first coating of a aqueous slurry of a mixture consisting of about 20 wt. % aluminum metal and about 80 wt. % of high temperature cement consisting of a mixture of 59.5 wt. % SiO 2 , 30 wt. % Al 2 O 3 and 10.5 wt. % Na 2 SiO 3 ; (b) drying said first coating; (c) applying a second coating over said first coating of an aqueous slurry consisting of approximately, in parts by weight: (1) 300 parts water, (2) 110 parts of a mixture consisting of about 90 wt. % SiC, 5 wt. % graphite and 5 wt. % SiO 2 , (3) 80 parts B 2 O 3 , (4) 4 parts Na 2 SiO 3 and (5) 2 parts NH 4 H 2 PO 4 ; and (d) drying said second coating.
Claim 25
Independent Claim
159 words
A method for applying an electrically non-conducting multiple protective coating composition to a carbon or graphite body comprising: (a) applying a first coating of a aqueous slurry of a mixture consisting of about 20 wt. % aluminum metal and about 80 wt. % of high temperature cement consisting of a mixture of 59.5 wt. % SiO 2 , 30 wt. % Al 2 O 3 and 10.5 wt. % Na 2 SiO 3 ; (b) drying said first coating; (c) applying a second coating over said first coating of an aqueous slurry consisting of approximately, in parts by weight: (1) 300 parts water, (2) 110 parts of a mixture consisting of about 90 wt. % SiC, 5 wt. % graphite and 5 wt. % SiO 2 , (3) 80 parts B 2 O 3 , (4) 4 parts Na 2 SiO 3 and (5) 2 parts NH 4 H 2 PO 4 ; and (d) drying said second coating.
Claim 26
Dependent Claim
15 words
The method of claim 20 wherein a waterproofing agent is applied to the coated body.
Claim 27
Dependent Claim
11 words
The method of claim 21 wherein the waterproofing agent is paraffin.
Claim 28
Independent Claim
23 words
The method of claims 14, 16, 17, 18, 19, 20, 21 or 22 wherein said first coating composition is applied in two stages.
Claim 29
Dependent Claim
37 words
The method of claim 23 wherein said first coating is initially applied to a thickness of about 0.1 to 0.5 mm., dried, then applied in an additional stage to a thickness of about 0.5 to 1.0 mm.
Claim 30
Independent Claim
184 words
A method for applying an electrically non-conducting multiple protective coating composition to a carbon or graphite body comprising: (a) applying an initial-stage first coating of a aqueous slurry of a mixture consisting of about 20 wt. % aluminum metal and about 80 wt. % of high temperature cement consisting of a mixture of 59.5 wt. % SiO 2 , 30 wt. % Al 2 O 3 and 10.5 wt. % Na 2 SiO 3 ; (b) drying said initial-stage first coating; (c) applying an additional-stage first coating of the slurry of (a) over said initial-stage first coating; (d) drying said additional-stage first coating; (e) applying a second coating over the two-stage first coating of an aqueous slurry consisting of approximately, in parts by weight: (1) 300 parts water, (2) 110 parts of a mixture consisting of about 90 wt. % SiC, 5 wt. % graphite and 5 wt. % SiO 2 , (3) 80 parts B 2 O 3 , (4) 4 parts Na 2 SiO 3 and (5) 2 parts NH 4 H 2 PO 4 ; and (f) drying said second coating.
Claim 31
Independent Claim
184 words
A method for applying an electrically non-conducting multiple protective coating composition to a carbon or graphite body comprising: (a) applying an initial-stage first coating of a aqueous slurry of a mixture consisting of about 20 wt. % aluminum metal and about 80 wt. % of high temperature cement consisting of a mixture of 59.5 wt. % SiO 2 , 30 wt. % Al 2 O 3 and 10.5 wt. % Na 2 SiO 3 ; (b) drying said initial-stage first coating; (c) applying an additional-stage first coating of the slurry of (a) over said initial-stage first coating; (d) drying said additional-stage first coating; (e) applying a second coating over the two-stage first coating of an aqueous slurry consisting of approximately, in parts by weight: (1) 300 parts water, (2) 110 parts of a mixture consisting of about 90 wt. % SiC, 5 wt. % graphite and 5 wt. % SiO 2 , (3) 80 parts B 2 O 3 , (4) 4 parts Na 2 SiO 3 and (5) 2 parts NH 4 H 2 PO 4 ; and (f) drying said second coating.
Claim 32
Dependent Claim
15 words
The method of claim 25 wherein a waterproofing agent is applied to the coated body.
Claim 33
Dependent Claim
11 words
The method of claim 26 wherein the waterproofing agent is paraffin.
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