| 摘要 |
<p>PRODUCTION OF CORROSION AND EROSION RESISTANT SOLID CARBON ARTICLES Solid carbon (graphite) articles used for such purposes as parts of molten metal pumps are rendered substantially resistant to both corrosion, in the form of oxidation, and erosion created by the flow of elevated temperature fluids. The surface of a graphite article is converted to silicon carbide to a depth of about 0.040 inch and then is treated with aluminum phosphate (AlPO4), chemically reacted with both the carbonaceous substrate and the silicon carbide overcoat, to form a non-porous, corrosion and erosion resistant stratum. The extremely hard silicon carbide which forms the exposed surface is extremely resistant to the effects of fluid erosion, while the carbonaceous interior of the article is less susceptible to oxidation due to the fact that the pore structure of the surface has been sealed and due to the oxidation-resistant effects of the aluminum phosphate. Tests have indicated that corrosion and erosion resistance is increased over 20 times compared with untreated graphite parts.</p> |
