Sintered product based on alumina and chromium oxide

A refractory element chosen among an electrode bushing block, an element in an electrolysis cell, an element of a zone of a glass furnace which may come into contact with a molten E glass and/or with a molten glass which is more resistive than E glass, and an element intended for an application in which an electrical resistivity greater than 500 Ω·cm at 1500° C. and at a frequency of 100 Hz is necessary, said refractory element having the following mean chemical composition, as a percentage by weight based on the oxides and for a total of 100%:

• Al2O3:
• complement to 100%
• 1.6%≦Cr2O3≦35%
• TiO2≧0.1%, the TiO2 content being such that the Cr2O3/TiO2 weight ratio is more than 16 and less than 50,
• Other species:
• ≦1%.

A method of producing a sintered product, comprising the following steps:

• a) mixing starting materials to form a starting charge, the median size of the starting materials employed being less than 100 μm and being determined so that the sintered product has the following mean chemical composition, as a percentage by weight based on the oxides and for a total of 100%:
• Al2O3:
• complement to 100%
• 1.6%≦Cr2O3≦35%
• TiO2≧0.1%, the TiO2 content being such that the Cr2O3/TiO2 weight ratio is more than 16 and less than 50,
• Other species:
• ≦1%;
• b) isostatic pressing to form a green part from said starting charge;
• c) sintering said green part to obtain said sintered product.