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Silicon nitride is a potential candidate for high temperature structural applications in coal gasification in which metallic materials approach the limits of their capabilities with respect to mechanical properties and corrosion resistance. The increase of the ISO turbine inlet temperature to 1200 or 1300 C is of critical importance in terms of efficiency and reducing emissions of CO, HC and NO(x) in coal gasification power plants. The main aims of this research were: (i) the evaluation of the corrosion resistance in environments similar to those that can be encountered in coal gasifiers (in terms of the partial pressure of sulphur and oxygen); (ii) the assessment of the effect of corrosion exposure on different aspects of mechanical behaviour such as strength, toughness, subcritical crack growth and creep. Provided a stable SiO(2)-rich layer can form, the data obtained may have some industrial relevance.

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Authors: SARAIVA MARTINS C, CEMUL, Instituto Superior Técnico, Lisboa (PT);GUERRA ROSA L, CEMUL, Instituto Superior Técnico, Lisboa (PT);STEEN M, JRC Petten (NL);BRESSERS J, JRC Petten (NL)
Bibliographic Reference: Paper presented: International Workshop on Tailoring of High Temperature Properties of Si(3)N(4) Ceramics, München (DE), October 6-9, 1993
Availability: Available from (1) as Paper EN 37959 ORA
Record Number: 199311499 / Last updated on: 1994-11-28
Original language: en
Available languages: en