Wet and salt corrosion of a porous Si 2N 2O-ZrO 2 composite material

Abstract

The hot corrosion behaviour of a low-cost, porous Si 2N 2O-ZrO 2 composite material, fabricated without the use of sintering additives has been studied in pure oxygen, humid oxygen (10, 15 and 20 vol% H 2O) and salt-containing environment (25 ± 5 ppm (in volume) NaCl). The corrosion experiments were carried out at 1000, 1200 and 1400 °C. For salt corrosion, a special test rig was used to simulate salt-containing combustion environments. The extent of internal oxidation has been found to be sensitive to the oxidation temperature. High oxidation resistance has been observed at temperatures > 1200 °C. Wet salt corrosion at temperatures above 1200 °C shows no increased attack on the material.