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STUDYING THE EFFECT OF HEAT TREATMENT ON THE CHEMICAL RESISTANCE OF PORCELAIN ENAMEL IN DIFFERENT ACIDIC MEDIAS | ||
| AL-TAQANI | ||
| Article 1, Volume 26, Issue 2, 2013, Pages 0-0 | ||
| Author | ||
| Hanaa Dakhel Ahmad | ||
| Abstract | ||
| This research aims to study the effect of heat treatment especially the crystallization, on the chemical resistance of porcelain enamel sample. For a crystallization to occur half of the amount of frit was reheated up to (850 C°) for a period of (90 min) and left to cool at a rate of (10C°/min) in the furnace. The two specimens were tested by X-ray diffraction to ensure the difference between them. The first specimen show a glassy material or amorphous phase, while the treated sample has the beaks of a crystalline material. By testing the chemical resistance of the two samples to (10%) concentration of hydrochloric, sulphuric, citric, and CH3COOH it is obviously appeared that the crystallization enamel has a much better chemical resistance than the amorphous one. Key words - :porcelain enamel, crystallization, chemical resistance | ||
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