Oxidation protection of carbon materials by acid phosphate impregnation
2002; Elsevier BV; Volume: 40; Issue: 8 Linguagem: Inglês
10.1016/s0008-6223(01)00297-4
ISSN1873-3891
Autores Tópico(s)Concrete and Cement Materials Research
ResumoAcid phosphate impregnation, with ozone pre-treatment, improves the oxidation resistance of carbon materials (polycrystalline graphite and pitch-based carbon fiber), as shown by weight measurement in air up to 1500 °C. The impregnation involves using phosphoric acid and dissolved aluminum hydroxide in the molar ratio 12:1 and results in a rough, white and hard aluminum metaphosphate coating of weight about 20% of that of the carbon before the treatment. Without ozone pre-treatment, the impregnation is not effective. Without aluminum hydroxide, the impregnation even degrades the oxidation resistance of the carbon.
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