Saint-gobain Centre De Recherches Et D'etudes Europeen

Centre National De La Recherche Scientifique

Saint Gobain Isover

Michel Gaubil

Isabelle Cabodi

Yves Boussant-Roux

Ludovic Massard

Olivier Citti

Charles Nicholas McGarry

Thierry Claude Consales

Julien P Fourcade

Frédéric D'Herin Bytner

Yves Marcel Leon Boussant-Roux

Marc Roubin

Laure Cossalter

Benjamin Bouvry

David Lechevalier

Christel Morand

Michael J Seaborne

Fiona Soteras

Sophie Papin

Yves Boussant-roux

Thierry Consales

Charles Nicholas Mc Garry

A process for quantifying the moisture in a blanket of fibers includes the emission of an incident electromagnetic wave towards the blanket, by at least one emitter; the receiving of the electromagnetic wave transmitted through the blanket, by at least one receiver; the identification of a variation of at least one parameter of the transmitted wave relative to the incident wave; the determination of a representative value of moisture in the blanket of fibers, as a function of the variation and of the effective volume of blanket that has actually interacted with the incident wave.

Process for quantifying the moisture in a fiber blanket

An unshaped product including, as weight percentages, A) particles (a) of at least one refractory material other than a glass and a glass-ceramic, and the main constituent(s) of which are alumina and/or zirconia and/or silica and/or chromium oxide: B) 2% to 15% of particles (b) of a hot binder chosen from glass-ceramic particles, particles made of a glass, and the mixtures of these particles, a glass being a noncrystalline material exhibiting a glass transition temperature of less than 1100&#xb0; C., the hot binder not being in the solid state at 1500&#xb0; C., C) less than 2% of particles (c) of hydraulic cement, D) less than 7% of other constituents, the particles (a) and (b) being distributed, as weight percentages in the following way: fraction&#x3c;0.5 &#x3bc;m: &#x2265;1%, fraction&#x3c;2 &#x3bc;m: &#x2265;4%, fraction&#x3c;10 &#x3bc;m: &#x2265;13%, fraction&#x3c;40 &#x3bc;m: 25%-52%.

Unshaped product for repairing glass melting furnaces

A molten refractory product having the following average chemical composition, in wt % on the basis of oxides and for a total of 100%: AlO: balance to 100%; FeO: 0.6%-5.0% and/or TiO: 1.5%-10.0%; FeO+TiO&#x2264;10.0%; NaO+KO: 1.0%-8.0%; SiO: 0.2%-2.0%; CaO+BaO+SrO: &#x2264;0.5%; Other oxide species: &#x2264;1.5%. Also, a glass-melting furnace and the use of the refractory product in the glass-melting furnace.

Refractory block and glass-melting furnace

A fused-cast refractory product including, as mass percentages on the basis of the oxides and for a total of 100% of the oxides: ZrO+HfO: remainder to 100%, with HfO&#x2264;5%; SiO: 1.5% to 7.5%; AlO: 1.0% to 3.0%; CaO+SrO: 1.2% to 3.0%; YO: 1.5% to 3.0%; NaO+KO: &#x3c;0.15%; BO: &#x3c;1.0%; PO: &#x3c;0.15%; FeO+TiO: &#x3c;0.55%; oxide species other than ZrO, HfO, SiO, AlO, NaO, KO, BO, CaO, SrO, YO, PO, FeOand TiO: &#x3c;1.5%.

Melted product with a high zirconium content

A sintered product made from a starting batch containing 5 to 50% zircon and having the following average chemical composition, in weight percentages on the basis of the oxides and for a total of 100%:

Doped sintered product based on zircon and zirconia

The invention relates to a process for manufacturing a refractory product, comprising the following successive steps: a) mixing of raw materials so as to form a suitable feedstock so that the block obtained in step d) comprises more than 85% of ZrO, b) melting of said feedstock until a molten material is obtained, c) optionally, casting said molten material, d) cooling of the molten material to solidification in the form of a block, e) optionally, heat treatment, process comprising a compression operation in which a compression pressure of greater than 0.2 MPa is applied to at least one portion of the outer surface of the block obtained in step d), the compression operation beginning at a temperature above the temperature at which, in said block, tetragonal zirconia is converted to monoclinic zirconia or 'phase transformation temperature', and ending at a temperature below said phase transformation temperature.

Refractory product having a high content of zirconia

Fused cast refractory product comprising in percentages by weight on the basis of the oxides and for a total of 100%, &#x2014;ZrO; balance to 100%, &#x2014;HfO: &#x3c;5% SiO: 2% to 10%; &#x2014;YO: 0.4% to 2.0%; &#x2014;CaO: 4.0% to 8.0%; &#x2014;BO+NaO+KO: 0.4% to 3.0% &#x2014;AlO: 0.3% to 2.0%; &#x2014;PO: &#x3c;0.05%; &#x2014;FeO+TiO: &#x3c;0.55%; &#x2014;other species: &#x3c;1.5%. Application in glass melting furnaces.

The present invention relates to a fused refractory product having the following average chemical composition, as a percentage by weight on the basis of the oxides and for a total of 100%: ZrO: 60.0%-80.0%; SiO: 4.0%-10.0%; AlO: balance to 100%; YO&#x2266;5.0%; NaO+KO+BO&#x2267;0.3% and SiO/(NaO+KO+BO)&#x2267;5.0; other oxide species: &#x2266;2.0%; the ratio of the ZrO/AlOweight contents being between 2.0 and 6.0.

A fused refractory product having the following average chemical composition, in % by weight on the basis of oxides and for a total of 100%: ZrO: 30-50%; SiO: 8-16%; AlO: balance to 100%; YO&#x2267;50/ZrOand YO&#x2266;5%; NaO+KO+BO&#x2267;0.2% and SiO/(NaO+KO+BO)&#x2267;5&#xd7;YO; CaO: &#x2266;0.5%; and other oxide species: &#x2266;1.5%.

Refractory block and glass furnace

The present invention relates to a molten, fluid refractory product comprising, in weight percentages on the basis of the oxides and for a total of 100% of the oxides:

Refractory product having high zirconia content

The invention relates to a molten cast refractory product comprising, in weight percentages on the basis of the oxides and relative to a total of 100% of the oxides:

A fused and cast refractory product containing, in weight percentages on the basis of the oxides and for a total of 100%:

A fused and cast refractory product including, in mass percentages on the basis of the oxides and for a total of 100% of the oxides: the mass content of a dopant selected from NbO, TaOand mixtures thereof being of less or equal to 1.0%, and the A/B ratio of the AlO/BOmass contents being less than or equal to 2.0.

Refractory product with high zirconia content

A powder including, in percentages by weight: (a) 94% to 99% of particles of at least one refractory material, the main constituent(s) of which are alumina and/or zirconia and/or silica; (b) 1% to 6% of a hydraulic cement; (c) 0 to 0.03% of organic fibers; (d) optionally, 0.075% to 1% of a surfactant; and (e) optionally, a setting accelerator, where the fraction of particles having a size below 40 &#x3bc;m being distributed, in percentages by weight relative to the weight of the powder, in the following manner: (1) fraction&#x3c;0.5 &#x3bc;m: &#x2267;4%, (2) fraction&#x3c;2 &#x3bc;m: &#x2267;5%, fraction&#x3c;10 &#x3bc;m: &#x2267;16%, and fraction&#x3c;40 &#x3bc;m: 29-45%, where the proportion of zirconia in the fraction of particles having a size smaller than 10 &#x3bc;m, called 'fines', is between 35% and 75% by weight relative to the total weight of said fraction.

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Les Angles, France

Michel Gaubil