Saint-gobain Centre De Recherches Et D'etudes Europeen

Richard Avedikian

Olivier Citti

Lionel Moitrier

Cyril Linnot

Yves Marcel Leon Boussant Roux

Yves Boussant-Roux

Christian Claude His

Thibault Champion

Michel Bobo

Jacques Guigonis

Yves Marcel Léon Boussant Roux

The invention relates to a particulate powder, said powder having a median circularity of greater than 0.87 wt % and less than 9.0 wt % of particles having a size greater than 100 &#x3bc;m. The powder and at least 80 wt % of the particles have a chemical composition in wt % on the basis of the oxides and for a total of 100%: CrO+AlO+ZrO+MgO+FeO+SiO+TiO&#x2267;90%; CrO+AlO+MgO&#x2267;60%; CrO&#x2267;9%; 20%&#x2267;SiO&#x2267;0.5%; and other oxides: &#x2266;10%. The invention can be used for a glass furnace.

Chromium oxide powder

A device selected from among a glass furnace and a channel for dispensing the glass comprising a block and/or a coating made of a sintered material obtained by sintering a particular mixture comprising a chromium oxide content, indicated as 'CrT', of between 10% and 82%. The die fraction is such that 0.39&#xb7;(CrT)+24&#x3c;CrM&#x3c;0.39&#xb7;(CrT)+52, CrM denoting the chromium oxide content by weight of the die fraction in wt % on the basis of the oxides of the die, and the aggregate is such that xII&#x2267;97%, xIII&#x2267;70%, and xIV&#x2266;xIII&#x2212;70%, CrG denoting the chromium oxide content by weight of one grain in wt % on the basis of the oxides of said grain.

Chromium oxide refractory material

A green part, a region of a refractory furnace or a hollow piece for producing a sintered refractory has the following mean mineral chemical composition in weight percent based of mineral oxides: 40%&#x2266;AlO&#x2266;94%, 0%&#x2266;ZrO&#x2266;41%, 2%&#x2266;SiO&#x2266;22%, 1%&#x3c;YO+VO+TiO+SbO+YbO+NaO. The sintered refractory products obtained from this green part give rise to a reduced bubbling effect.

Hollow piece for producing a sintered refractory product exhibiting improved bubbling behaviour

The invention concerns a sintered refractory product having the following average chemical composition, in weight percentages based on oxides: 20%&#x3c;AlO&#x3c;90%; 6%=SiO&#x3c;30%; 3%&#x3c;ZrO&#x3c;50%; 0%=CrO&#x3c;50%. The inventive product is characterized in that it comprises 17 to 85 wt. % of mullite-zirconium grains.

Sintered refractory product exhibiting enhanced thermal shock resistance

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Robion, France

Richard Avedikian