Saint-gobain Centre De Recherches Et D'etudes Europeen

Emmanuel Nonnet

Eric Hanus

Andrei Schon

Marcel Yancu

Rimma Khodakovskaya

Moshe Link

Yves Boussant-Roux

Bing Liu

David Bouttes

Yves Boussant-roux

Sintered bead that has a crystalline composition, as percentages by weight based on the total weight of the crystalline phases: zircon<25%; 50%≤cubic zirconia+tetragonal zirconia≤95%, the cubic zirconia content being greater than 50%, the cubic zirconia content being the (cubic zirconia/(cubic zirconia+tetragonal zirconia) ratio by weight); 0≤monoclinic zirconia≤(10−0.2*tetragonal zirconia) %; 5%≤corundum≤50%; crystalline phases other than zircon, cubic zirconia, tetragonal zirconia, monoclinic zirconia and corundum<10%; and the following chemical composition, as percentages by weight based on the oxides: 34%≤ZrO+HfO, ZrO+HfObeing the remainder to 100%; HfO≤4.0%; 0.5%≤SiO≤14.1%; 4.5%≤AlO≤49.6%; 2.75%≤YO≤22.8%; MgO≤5%; CaO≤2%; oxides other than ZrO, HfO, SiO, AlO, MgO, CaO and YO<5.0%.

Sintered alumina-zirconia balls

A sintered bead with the following crystal phases, in percentages by mass based on crystal phases: 25%&#x2264;zircon, or 'Z', &#x2264;94%; 4%&#x2264;stabilized zirconia+stabilized hafnia, or 'Z', &#x2264;61%; monoclinic zirconia+monoclinic hafnia, or &#x201c;Z&#x201d;&#x2264;50%; corundum&#x2264;57%; crystal phases other than Z, Z, Zand corundum&#x3c;10%; the following chemical composition, in percentages by mass based on oxides: 33%&#x2264;ZrO+HfO, or &#x201c;Z&#x201d;&#x2264;83.4%; HfO&#x2264;2%; 10.6%&#x2264;SiO&#x2264;34.7%; AlO&#x2264;50%; 0%&#x2264;YO, or &#x201c;Z&#x201d;; 0%&#x2264;CeO, or &#x201c;Z&#x201d;; 0.3%&#x2264;CeO+YO&#x2264;19%, provided that (1) CeO+3.76*YO&#x2265;0.128*Z, and (2) CeO+1.3*YO&#x2264;0.318*Z, with Z=Z+Z+Z&#x2212;(0.67*Z*(Z+Z+Z)/(0.67*Z+Z+Z)); MgO&#x2264;5%; CaO&#x2264;2%; oxides other than ZrO, HfO, SiO, AlO, MgO, CaO, CeOand YO&#x3c;5.0%.

Sintered zircon beads

A sintered bead presenting the following chemical analysis, in percentages by weight and for a total of 100%: ZrO+HfO: 78%-85%; CeO: &#x2267;15%; AlO: &#x3e;0.1%; additive: &#x3e;0.1%; impurities: &#x3c;1%; the additive being selected from MnO, MnO, FeO, CuO, TiO, YO, SbO, ZnO, and mixtures thereof. Application to microgrinding and to microdispersion.

Sintered bead based on zirconia and on cerium oxide

The invention relates to a molten ceramic particle, characterized in that it has the following chemical composition in wt % based on oxides and for a total of 100%: 55%&#x3c;ZrO+HfO&#x3c;70%; 20%&#x3c;SiO&#x3c;30%; 6.5%&#x3c;MgO&#x3c;9.5%; AlOin an amount such that the mass ratio MgO/AlOis comprised between 2.4 and 6.6; and less than 0.6% of other oxides.

Particle of a molten ceramic material

The present invention provides a fused ceramic particle, having the following chemical composition, in percentages by weight based on the oxides and for a total of 100%: Use in particular as milling agents, wet medium dispersion agents, propping agents, heat exchange agents, or for the treatment of surfaces.

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Sarrians, France

Emmanuel Nonnet