| 配方類型： |
MISCELLANEOUS |
| 配方說明： |
Carbon and Graphite Bonded Shapes |
| 配方組成： |
Catalyst-85% phosphoric acid/2-3
Union Carbide BB6 (65% on 20 mesh)/45
Dry blend the catalyst in a foundry type muller for 2 minutes
Union Carbide BB5 (60% on 65 mesh)/44
Union Carbide BB6 (65% on 20 mesh)/26
Union Carbide 38 (98% through 260 mesh)/30
Catalyst-85% phosphoric acid/2-3
furfuryl Alcohol No-Bake Resin/30
Union Carbide 38 (98% through 260 mesh)/10
Union Carbide BB5 (60% on 65 mesh)/45
furfuryl Alcohol No-Bake Resin/19 |
| 配制方法： |
Blend the resin upon the catalyzed aggregate for 5 minutes.
The resulting mix with 10-30 minutes working life is promptly rammed into a form to a typical green density of approximately 1.6. Green strength is usually adequate for immediate stripping. Alternatively, the shape can be allowed to harden in the form and then stripped. Shellac or other furfuryl alcohol soluble coatings on the form should be avoided. A release agent may be necessary and in our experience silicone spray on metal patterns or polyethylene suspensions on wood patterns have been most satisfactory.
For carbonization the shape is buried in a mixture of equal parts sand and coke. Cycles satisfactory for a 2 thickness are as follows: FORMULA No.1 Heat to 1500F. at a rate of 125/hr. and hold for about 4 hours.
FORMULA No.2 Starting at 150F. raise the temperature about 10 per hour until 300F. is reached. Then carbonize as for Formula No.1.
Filling Voids in Carbon and Graphite Products Apply 28 vacuum for 30 minutes |
