Corrosion of technical ceramics by molten aluminium

✍ Scribed by U. Schwabe; L.R. Wolff; F.J.J. van Loo; G. Ziegler

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 780 KB
• Volume: 9
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/0955-2219(92)90101-i

✦ Synopsis

Corrosion investigations with various types o[ nonoxide technical ceramics, eight silicon nitride materials (1 grade of HIPRBSN, 3 grades of HPSN and 4 grades of RBSN), and two O'pes o[ silieon carbide (HIPSiC and SiSiC) were carried out h7 alumhlium melts (pure aluminium and AIZnMgCul'5). HIPRBSN and HPSN materials exhibit near O, no corrosion attack under the most severe conditions applied ( lO00°C for 750h). RBSN materials with relatively high open porosity are attacked after relatively short times. HIPSiC is considerably more attacked than HIPRBSN and the HPSN materials: however, it is also fairly corrosion resistant. SiSiC reveals the poorest corrosion behaviour of the materials investigated. The results are explained in terms ~[ thermodynamics, d(ffhsion through the metal[ceramic interjaee and wetting ~tJ'e c t s.