Abstract:
A fuel cell includes a ceramic component (10) and a sealing component (15). The sealing component includes a first glass-ceramic layer (20) over the ceramic component (10) and a second glass-ceramic layer (30) over the first glass-ceramic layer (20), each of the first and the second glass-ceramic layers (20,30) independently including between about 0.5% and about 50% glass phase content by volume. The first glass-ceramic layer (20) includes a higher glass phase content than the second glass-ceramic layer (30), and between about 0.5% and about 10% glass stabilizer component by weight. In a method of sealing a ceramic component (10) of a fuel cell, a first coat is applied over a first ceramic component (10) of the fuel cell, the first coat including SiO 2 . The first and second coats are heated to form a sealing component (15), to thereby seal the ceramic component (10) with the sealing component (15). Features of the sealing component (15) are as described above.
Abstract:
A vitrified superabrasive product includes a superabrasive component and a vitrified bond component in which the superabrasive component is dispersed. The vitrified bond includes an oxide of a lanthanoid. Additionally, the vitrified bond component defines pores that can be essentially all less than 800 µm in diameter. Seventy percent of the pores are in a range of between about 40 µm and about 500 µm and have an average aspect ratio less than about 2. The porosity is in a range of between about 50% and about 90% of the total volume of the superabrasive product.
Abstract:
A solid oxide ceramic includes a substrate defining a surface, the substrate including at least one material selected from the group consisting of yttria-stabilized zirconia (YSZ), lanthanum strontium titanate (LST), lanthanum strontium manganite (LSM), and nickel oxide -YSZ composite. The solid oxide ceramic further includes a seal coating at least a portion of the surface, the seal including a Sanbornite (BaO⋅2SiO 2 ) crystal phase, a Hexacelsian (BaO⋅Al 2 O 3 ⋅2SiO 2 ) crystal phase, and a residual glass phase, wherein the seal has a coefficient of thermal expansion equal to or less than that of the substrate at said surface. The glass composition can have a difference between a glass crystallization temperature and a glass transition temperature in a range of between about 200 °C and about 400 °C at a heating rate of about 20 °C/min.
Abstract:
A vitrified superabrasive product includes a superabrasive component and a vitrified bond component in which the superabrasive component is dispersed. The vitrified bond includes an oxide of a lanthanoid. Additionally, the vitrified bond component defines pores that can be essentially all less than 800 μm in diameter. Seventy percent of the pores are in a range of between about 40 μm and about 500 μm and have an average aspect ratio less than about 2. The porosity is in a range of between about 50% and about 90% of the total volume of the superabrasive product.
Abstract:
Process for manufacturing a product, comprising the following successive steps: a) mixing raw materials to form a starting feedstock, b) melting the starting feedstock so as to form a molten liquid, c) solidifying the molten liquid so as to obtain a fused product comprising crystals linked by a glassy phase, and d) crystallization heat treatment of the glassy phase of said fused product, in which the composition of the starting feedstock is adapted in order to manufacture a product having the following chemical composition, as weight percentages based on the oxides, and for a total of 100%: 40% = (ZrO2 + HfO2) = 94%, 6% 2 2O3, 0% = Al2O3, 2% = SiO2, 0% = MgO, 0% = TiO2, and other oxides = 1%. Use of the product obtained as a grinding agent, an agent for dispersing in a wet medium, a surface treatment agent, a supporting agent or a heat-exchange agent.
Abstract translation:制造产品的方法,包括以下连续步骤:a)混合原料以形成起始原料,b)熔化起始原料以形成熔融液体; c)使熔融液体固化,得到熔融物 包括通过玻璃相连接的晶体,以及d)所述熔融产物的玻璃相的结晶热处理,其中原料原料的组成适于制备具有以下化学组成的产物,其重量百分比基于 氧化物,总共100%:40%=(ZrO 2 + HfO 2)= 94%,6%2 2 O 3,0%= Al 2 O 3,2%= SiO 2,0%= MgO,0%= TiO 2等 氧化物= 1%。 使用作为研磨剂获得的产物,分散在湿介质中的试剂,表面处理剂,支持剂或热交换剂。
Abstract:
A solid oxide ceramic includes a substrate defining a surface, the substrate including at least one material selected from the group consisting of yttria-stabilized zirconia (YSZ), lanthanum strontium titanate (LST), lanthanum strontium manganite (LSM), and nickel oxide -YSZ composite. The solid oxide ceramic further includes a seal coating at least a portion of the surface, the seal including a Sanbornite (BaO·2SiO2) crystal phase, a Hexacelsian (BaO·Al2O3·2SiO2) crystal phase, and a residual glass phase, wherein the seal has a coefficient of thermal expansion equal to or less than that of the substrate at said surface. The glass composition can have a difference between a glass crystallization temperature and a glass transition temperature in a range of between about 200 °C and about 400 °C at a heating rate of about 20 °C/min.
Abstract:
Procédé de fabrication d'un produit, comprenant les étapes successives suivantes : a) mélange de matières premières pour former une charge de départ, b) fusion de la charge de départ de manière à former un liquide en fusion, c) solidification du liquide en fusion de manière à obtenir un produit fondu comportant des cristaux liés par une phase vitreuse, et d) traitement thermique de cristallisation de la phase vitreuse dudit produit fondu, dans lequel la composition de la charge de départ est adaptée pour fabriquer un produit présentant la composition chimique suivante, en pourcentages en masse sur la base des oxydes et pour un total de 100 % : 40 % ≤ (ZrO 2 + HfO 2 ) ≤ 94 %, 6 % 2 2 O 3 0 % ≤ Al 2 O 3 2 % ≤ SiO 2 , O % ≤ MgO, O % ≤ TiO 2 , et autres oxydes ≤ 1 %. Utilisation du produit obtenu en tant qu'agent de broyage, agent de dispersion en milieu humide, agent pour le traitement de surface, agent de soutènement ou agent d'échange thermique.
Abstract:
L' invention se rapporte à un filtre dont la partie filtrante est constituée par un matériau inorganique comprenant des grains de SiC liés par une phase du type vitrocéramique, pour former une structure poreuse dont la porosité ouverte est comprise entre 20 et 70%, ladite phase liante vitrocéramique comprenant au moins les constituants suivants, en pourcentage molaire de la totalité des oxydes présents dans ladite phase: SiO 2 : de 30% à 80% Al 2 O 3 : de 5% à 45% MO : de 10% à 45%, MO représentant un oxyde d'un cation divalent ou la somme des oxydes des cations divalents présents dans ladite phase vitrocéramique, M étant de préférence choisi parmi Ca, Ba, Mg ou Sr, ladite phase vitrocéramique présentant un pourcentage volumique de phase vitreuse résiduelle inférieur à 20%.
Abstract:
A fuel cell includes a ceramic component and a sealing component. The sealing component includes a first glass-ceramic layer over the ceramic component and a second glass-ceramic layer over the first glass-ceramic layer, each of the first and the second glass- ceramic layers independently including between about 0.5% and about 50% glass phase content by volume. The first glass-ceramic layer includes a higher glass phase content than the second glass-ceramic layer, and between about 0.5% and about 10% glass stabilizer component by weight. In a method of sealing a ceramic component of a fuel cell, a first coat is applied over a first ceramic component of the fuel cell, the first coat including SiO2, and further including between about 0.5% and about 10% glass stabilizer component by weight. A second coat is applied over the first coat, the second coat including SiO2. The first and second coats are heated to form a sealing component, to thereby seal the ceramic component with the sealing component. Features of the sealing component are as described above.
Abstract:
The invention relates to a method for manufacturing a flat strip of glass as a precursor of glass-ceramic, that comprises the continuous flotation of the molten glass on a molten metal melt in a flotation housing, said glass being poured at the molten state and at a temperature exceeding the devitrification starting temperature on the molten metal upstream from the housing, said glass progressively forming a running strip on said metal melt, the glass cooling speed being of at least 18°C/min between, on the one side, the moment when the glass is at the theoretical temperature of maximum devitrification rate and, on the other end, the following moment when the glass is at the theoretical temperature at which the devitrification crystal growth rate becomes lower than 1 micron per minute. The glass thus floated shows no devitrification.