摘要:
To provide a high-zirconia electrocast refractory in which occurrence of cracks in manufacture and occurrence of cracks in use as a furnace material is further reduced while maintaining extremely high corrosion resistance to molten glass. The high-zirconia electrocast refractory contains 96.7 to 98.5 mass% of ZrO 2 , 0.8 to 2.7 mass% of SiO 2 , 0 to 0.2 mass% of Na 2 O, 0.21 to 1 mass% of K 2 O, 0.1 to 0.4 mass% of Al 2 O 3 , and does not substantially contain B 2 O 3 , in terms of oxide, as a chemical composition, wherein contents of the Na 2 O and the K 2 O satisfy a relation of following Formula (1) 0.15 mass % ≤ C K 2 O / 2 + C Na 2 O ≤ 0.6 mass % where C K2O is the content of K 2 O and C Na2O is the content of Na 2 O, and each of the contents is expressed by mass% in the refractory
摘要:
A high zirconia electrically fused cast refractory of high electric resistance having long time durability, less suffering from cracking during production and upon temperature rising, excellent in productivity, less forming zircon crystals even upon heating the refractory in itself and when the refractory is in contact with molten glass, generating less cracks even when undergoing heat cycles during operation of a glass melting furnace is provided. A high zirconia electrically fused cast refractory has, as chemical components, 85 to 95% by weight of ZrO2, 0.1 to less than 0.8% by weight of Al2O3, 3.5 to 10.0% by weight of SiO2, less than 0.05% by weight of Na2O and K2O in total, 0.1 to 1.5% by weight of B2O3, 0.1% by weight or less of MgO, 0.01 to 0.2% by weight of CaO, in the case where any one of BaO and SrO is contained, from 0.05 to 3.0% by weight of BaO or 0.01 to 3.0% by weight of SrO, or in the case where both of them are contained, 0.01% by weight or more of SrO and from 0.01% to 3.0% by weight in total of SrO and BaO, 0.1 to 0.7% by weight of SnO2, 0.3% by weight or less of Fe2O3 and TiO2 in total, less than 0.01% by weight of P2O5, and less than 0.01% by weight of CuO.
摘要:
A method for fabricating a ceramic material includes providing a mobilized filler material capable of infiltrating a porous ceramic matrix composite. The mobilized filler material includes at least one of a ceramic material and a free metal. The mobilized filler material is infiltrated into pores of the porous ceramic matrix composite. The mobilized filler material is then immobilized within the pores of the porous ceramic matrix composite.
摘要:
The present invention provides a molten glass conveying equipment element which has a ceramic structure that achieves prevention of crack generation in a conduit caused by thermal expansion during heating or contraction during cooling as well as prevention of conduit deformation caused by inflation pressure applied by molten glass, and that is not susceptible to erosion even if the molten glass leaks for some reason. The present invention also provides a method for manufacturing the molten glass conveying equipment element and a glass manufacturing apparatus comprising the molten glass conveying equipment element.
摘要:
Fused refractory product having the following average chemical composition, in % by weight on the basis of the oxides and for a total of 100%: ZrO 2 : 30‑50%; SiO 2 : 8‑16%; Al 2 O 3 : balance to 100%; Y 2 O 3 ≥ 50/ZrO 2 and Y 2 O 3 ≤ 5%, Na 2 O+K 2 O+B 2 O 3 ≥ 0.2% and SiO 2 /(Na 2 O+K 2 O+B 2 O 3 ) ≥ 5 × Y 2 O 3 ; CaO: ≤ 0.5%; other oxide species: ≤ 1.5%.
摘要:
The object of the present invention is to provide a refractory having sufficient corrosion resistance against alkali vapors and excellent thermal shock resistance which is light in weight and suitable for glass tank furnaces. The present invention provides a high-alumina fused cast refractory comprising from 94 to 98% of Al 2 O 3 , from 1 to 6%, in total, of Na 2 O and/or K 2 O, which is mainly composed of α-Al 2 O 3 crystals and β-Al 2 O 3 crystals, has pores dispersed in it and has a porosity of from 5 to 30%.
摘要:
A refractory article includes a body including a ceramic having an aluminosilicate present in an amount of at least 70 wt % and not greater than 99 wt % for a total weight of the body, and the body further includes a dopant including a Mg-containing oxide compound and a Fe-containing oxide compound, and the dopant is present in an amount within a range including at least 1 wt % and not greater than 12 wt %.