摘要:
A method for producing a molten glass conveying equipment element. The molten glass conveying equipment element has a conduit structure for molten glass containing at least one conduit comprising platinum or a platinum alloy, a first ceramic structure provided around the conduit and a second ceramic structure located around the first ceramic structure. The method includes filling a gap between the conduit and the second ceramic structure with a slurry body, and sintering the slurry body at a temperature of 1,300 to 1,550° C., thereby forming the first ceramic structure. The slurry body is prepared by blending specific first particles, specific second particles and specific third particles with specific mass ratios.
摘要:
Refractory cold start slag band including an admixture of partially stabilised zirconia and/or fully stabilised zirconia and monoclinic zirconia. The proportion of monoclinic relative to the total zirconia content is at least 50% by weight and the grain diameter of the monoclinic zirconia is from 0.25 to 0.5mm.
摘要:
Sintered refractory product including, in percentages by weight on the basis of the oxides, —more than 10% of chromium oxide Cr2O3, —more than 2% of hafnium oxide HfO2, —more than 1% of zirconium oxide ZrO2, the total content of chromium, hafnium and zirconium oxides Cr2O3+HfO2+ZrO2 being greater than 70%.
摘要:
The present invention provides a high-purity fused and crushed stabilized zirconia powder. The powder—with or without further processing, such as plasma spheroidization—is used in thermal spray applications of thermal barrier coatings (TBCs) and high-temperature abradables. The resulting coatings have a significantly improved high temperature sintering resistance, which will enhance the durability and thermal insulation effect of the coating.
摘要:
The present invention relates to a sintered product elaborated from a starting charge containing 75-99% of zircon, in mass percentage based on the oxides and having the following average weight chemical composition, in mass percentages based on the oxides 60%≦ZrO2≦72.8%, 27%≦SiO2≦36%, 0.1%≦B2O3+GeO2+P2O5+Sb2O3+Nb2O5+Ta2O5+V2O5, 0.1%≦ZnO+PbO+CdO, B2O3+GeO2+P2O5+Sb2O3+Nb2O5+Ta2O5+V2O5+ZnO+PbO+CdO≦5%, 0%≦Al2O3+TiO2+MgO+Fe2O3+NiO+MnO2+CoO+CuO≦5%, other oxides: ≦1.5%, for a total of 100%. Notably used in a glass furnace.
摘要:
A refractory ceramic material possessing a solidus temperature between 2500° C. and 2800° C., having a compactness greater than 85%, and a microstructure such that the material is composite of: (a) hafnium dioxide HfO2 grains having a monoclinic structure (1); (b) hafnium dioxide HfO2 grains having a cubic structure (2) which is stabilized by yttrium oxide Y2O3, the yttrium oxide Y2O3 representing 0.5 mol % to 8 mol % relative to the total number of moles of hafnium dioxide HfO2; (c) closed pores (3); (d) non-interconnected open pores. The process of manufacturing the material and a structural part incorporating the material are also set forth.
摘要翻译:一种耐高温陶瓷材料,具有2500℃至2800℃之间的固相线温度,其致密度大于85%;以及微结构使该材料复合为:(a)具有单斜晶系结构的二氧化铪HfO2晶粒( 1); (b)通过氧化钇Y 2 O 3稳定的具有立方结构(2)的二氧化铪HfO 2颗粒,氧化钇Y 2 O 3相对于二氧化铪二氧化铪的总摩尔数为0.5mol%至8mol%; (c)闭孔(3); (d)非互连的开孔。 还阐述了制造材料的过程和结合材料的结构部件。
摘要:
A powder metallurgy process for the manufacture of powders of a refractory ceramic material, comprising the consecutive steps of: (i) obtaining a dry mixture of a hafnium dioxide HfO2 powder and an yttrium oxide Y2O3 powder; (ii) step of granulation by pelletization of the dry mixture under stirring in order to obtain a granulated mixture, this granulation step comprising the spraying, into the dry mixture, of an aqueous solution comprising polyvinyl alcohol (PVA) and polyethylene glycol (PEG); (iii) drying of the granulated mixture; (iv) filling of a mold with said granulated mixture; (v) isostatical or semi-isostatical pressing of the granulated mixture in order to obtain a compact mixture; (vi) sintering of the compact mixture in order to obtain a refractory ceramic material at a solidus temperature in the range between 2500° C. and 2800° C.
摘要:
The present invention relates to a sintered product elaborated from a starting charge containing 75-99% of zircon, in mass percentage based on the oxides and having the following average weight chemical composition, in mass percentages based on the oxides 60%≦ZrO2≦72.8%, 27%≦SiO2≦36%, 0.1%≦B2O3+GeO2+P2O5+Sb2O3+Nb2O5+Ta2O5+V2O5, 0.1%≦ZnO+PbO+CdO, B2O3+GeO2+P2O5+Sb2O3+Nb2O5+Ta2O5+V2O5+ZnO+PbO+CdO≦5% 0% ≦Al2O3+TiO2+MgO+Fe2O3+NiO+MnO2+CoO+CuO≦5%, other oxides: ≦1.5%, for a total of 100%. Notably used in a glass furnace.
摘要:
An anode component of a solid oxide fuel cell is formed by combining a relatively coarse yttria-stabilized-zirconium (YSZ) powder, that is substantially composed of elongated particles, with a relatively fine NiO/YSZ or NiO powder of reduced particle size, whereby, upon sintering the combined powders, the coarse YSZ powder forms a microstructural cage of open porosity wherein the fine powder is distributed through the open porosity of the cage. A method of forming a cathode component includes combining a coarse YSZ powder, that is substantially composed of elongated particles, with a fine lanthanum strontium manganite powder of reduced particle size, whereby, upon sintering the combined powders, the coarse YSZ powder forms a microstructural cage of open porosity, wherein the fine powder is distributed through the open porosity of the cage.
摘要:
In one aspect, the invention includes a heat stable, formed ceramic component that includes a multimodal grain distribution including (i) at least 50 wt % of coarse grains including stabilized zirconia, the coarse grains comprising a D50 grain size in the range of from 5 to 800 μm, based upon the total weight of the component; and (ii) at least 1 wt % of fine grains comprising a D50 average grain size not greater than one-fourth the D50 grain size of the coarse grain, dispersed within the coarse grains, based upon the total weight of the component; wherein after sintering, the component has porosity at ambient temperature in the range of from 5 to 45 vol. %, based on the formed volume of the component. In other embodiments, the invention includes a process for the manufacture of a hydrocarbon pyrolysis product from a hydrocarbon feed using a regenerative pyrolysis reactor system, comprising the steps of: (a) heating a pyrolysis reactor comprising a bi-modal stabilized zirconia ceramic component to a temperature of at least 1500° C. to create a heated reactive region, wherein after exposing the component to a temperature of at least 1500° C. for two hours the component has a bulk porosity measured at ambient temperature in the range of from 5 to 45 vol. %, based on the bulk volume of the component; (b) feeding a hydrocarbon feed to the heated pyrolysis reactor to pyrolyze the hydrocarbon feed and create a pyrolyzed hydrocarbon feed; and (c) quenching the pyrolyzed hydrocarbon feed to produce the hydrocarbon pyrolysis product.