Influence of oxidation in SO(2)/air mixtures on the room temperature strength of silicon nitride
The influence of oxidation in SO(2)/air mixtures on the mechanical properties of two hot-pressed and one pressureless sintered Si(3)N(4) ceramics was investigated. Samples were corroded for 25 hours in the range 800-1500 C in 1 Vol.% SO(2) in dry air, and the residual flexural strength was measured at room temperature. In air-SO(2), the dominant reaction process is oxidation accompanied by reaction of sulphur oxides with the surface oxide layers to yield sulphates where these are stable under the experimental conditions. This sulphate formation appears not to affect the mechanical strength of silicon nitride.
Bibliographic Reference: Paper presented: Journée d'Études sur les Nitrines, Limoges (FR), March 30-31, 1993
Availability: Available from (1) as Paper EN 37969 ORA
Record Number: 199311562 / Last updated on: 1994-11-28
Original language: en
Available languages: en