Refractory product with a SiAiON matrix

Abstract

A sintered refractory product consisting of: a granulate consisting of all the particles having a size larger than 100 [mu]m, or "grains", the granulate representing between 55% and 85% by mass of the product, the maximum size of the grains being smaller than 3.5 mm, and a matrix binding said grains and consisting of the particles having a size smaller than or equal to 100 [mu]m, or "fine particles", said matrix comprising at least one crystallised SiAlON phase of formula SixAlyOuNv, in which x is greater than or equal to 0, greater than 0.05, greater than 0.1 or greater than 0.2, and less than or equal to 1, less than or equal to 0.8 or less than or equal to 0.4; y is greater than 0, or greater than 0.1, greater than 0.3 or greater than 0.5, and less than or equal to 1; u is greater than or equal to 0, greater than 0.1 or greater than 0.2, and less than or equal to 1 or less than or equal to 0.7; v is greater than 0, greater than 0.1, greater than 0.2 or greater than 0.5, or greater than 0.7, and less than or equal to 1; at least one of stoichiometric indices x, y, u and v being equal to 1, the volume of the fraction of the pores having a size of between 10 and 100 microns being greater than 4% of the total volume of pores.

Description

technical field [0001] The present invention relates to a refractory sintered product, in particular in block form, and to a method for its manufacture. The invention also relates to the use of this product or block for the manufacture of metallurgical furnace coatings, in particular for the coating of crucibles or slots or tuyeres of blast furnaces, or even other furnace refractory coatings, heat exchangers Refractory coatings or cooking supports, more particularly ceramic or metal powder cooking supports. Background technique [0002] Composite refractory products are known which comprise refractory particles linked by a binder matrix of the SiAlON type. Such products are known in particular from US4,533,646, US3,991,166, US4,243,621 or EP0153000. These products are resistant to steam oxidation and alkaline attack, but have poor corrosion resistance. [0003] EP0482984 discloses a refractory product comprising 6-z al z o z N 8-z Refractory particles connected by a m...

AI Technical Summary

Problems solved by technology

However, their thermomechanical strength, especially their resistance to thermal cycling is still insufficient in the harshest environments

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