Inorganic fiber with improved shrinkage and strength
AssigneeUnifrax I LLC
InventorsDonghui ZHAO, Bruce K. Zoitos, Michael J. Andrejcak, Jason M. HAMILTON
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Abstract
An inorganic fiber containing silica and magnesia as the major fiber components which further includes intended lithium oxide and strontium oxide additions to improve the thermal stability of the fiber. The inorganic fiber exhibits good thermal performance at 1260° C. and greater, retains mechanical integrity after exposure to the use temperature, and exhibits low biopersistence in physiological fluids. Also provided are thermal insulation product forms, methods of preparing the inorganic fiber and of thermally insulating articles using thermal insulation prepared from a plurality of the inorganic fibers.
Claims45
An inorganic fiber comprising the fiberization product at least one alkaline earth metal oxide, silica, lithium oxide and strontium oxide.
A method for preparing the inorganic fiber exhibiting low biopersistence in physiological saline, low shrinkage, and good mechanical strength comprising:
- forming a melt with ingredients comprising (i) about 65 to about 86 weight percent silica (ii) about 14 to about 35 weight percent magnesia, (iii) greater than 0 to about 1 weight percent lithium oxide, (iv) greater than 0 to about 2.5 weight percent strontium oxide, (v) optionally greater than 0 to 11 weight percent zirconia, and (vi) optionally a viscosity modifier;
- and producing fibers from the melt.
An inorganic fiber containing article comprising at least one of bulk fiber, blankets, blocks, boards, caulking compositions, cement compositions, coatings, felts, mats, moldable compositions, modules, papers, pumpable compositions, putty compositions, sheets, tamping mixtures, vacuum cast shapes, vacuum cast forms, or woven textiles, braids, cloths, fabrics, ropes, tapes, sleeving, wicking, said fiber containing article comprising the fiberization product of (i) about 65 to about 86 weight percent silica (ii) about 14 to about 35 weight percent magnesia, (iii) greater than 0 to about 1 weight percent lithium oxide, (iv) greater than 0 to about 2.5 weight percent strontium oxide, (v) optionally greater than 0 to 11 weight percent zirconia, and (vi) optionally a viscosity modifier;
- and producing fibers from the melt.
Dependencies are inferred from the claim text.