摘要:
A heat-insulating material is provided in which thermal conductivity is controlled not to increase and good insulation properties are held even in a high temperature range. The heat-insulating material is formed of a spinel porous sintered body having a porosity of 65 to 90 vol. % and represented by a chemical formula XAl2O4 (X=Zn, Fe, Mg, Ni, or Mn) which is arranged such that large pores having a diameter of greater than 1000 μm occupy 25 vol. % or less of the total pore volume, fine pores having a diameter of 0.45 μm or less occupy 5 to 40 vol. % of the volume of the pores having a diameter of 1000 μm or less, at least one pore-diameter distribution peak is within a range of 0.14 to 10 μm, and is formed of sintered particles having a calculated average particle diameter of 0.04 to 1 μm.
摘要:
The present invention relates to anodic porous alumina (APA) in the form of microparticles, characterized in that it contains interconnected through nanopores, and to its use in the preparation of a new composite material, which is useful for example in the field of conservative dentistry. The invention further relates to a process for preparing the nanoporous alumina of the invention in microparticles.
摘要:
Small particle compositions are provided. The particles may have one or more desired features related to particle morphology, topology and crystallographic orientation. The small particle size coupled with such feature(s) can lead to significant property advantages in a variety of different applications including catalytic applications.
摘要:
A material is described in the form of a millimetric article constituted by coarse alumina particles with a median diameter in the range 10 to 200 μm, said coarse particles being at a distance, from one interface to another, of less than 10 μm, fine alumina particles with a median diameter in the range 0.5 to 10 μm, said fine particles being at a distance, from one interface to another, of less than 5 μm and being located in the space between the coarse particles, and a binder constituted by aluminium phosphate, said binder being located in the space between said fine and coarse particles, said material having a mesoporous volume, measured by mercury porosimetry, in the range 0.2 to 2 mL/g, a macroporous volume, measured by mercury porosimetry, in the range 0.05 to 0.2 mL/g and a BET specific surface area in the range 80 to 350 m2/g.
摘要:
A method for producing an α alumina sintered body for the production of a sapphire single crystal characterized in that a relative density is 60% or more, a closed porosity is 10% or less, a purity is 99.99% by mass or more, each content of Si, Na, Ca, Fe, Cu and Mg is 10 ppm or less, and a volume is 1 cm3 or more, and the α alumina sintered body can be obtained by mixing 100 parts by weight of an α alumina with 1 part by weight or more and 20 parts by weight or less of an α alumina precursor to obtain a mixture, forming a compact from the obtained mixture, and firing the obtained compact.
摘要:
Nanoplatelet forms of metal hydroxide and metal oxide are provided, as well as methods for preparing same. The nanoplatelets are suitable for use as fire retardants and as agents for chemical or biological decontamination.
摘要:
An aluminum hydroxide gel particle having high purity and extremely high acid reactivity and a production method thereof.The aluminum hydroxide gel particle has an iron (Fe) content of 1 to 10 ppm.
摘要:
The object of the invention is a method for dissolving carbon dioxide from flue or other gas and for the neutralization of the solution obtained. The gas, in which the partial pressure of carbon dioxide is at least 0.4 bar, is led to a dissolution process, where the major part of the carbon dioxide is dissolved into a flow of water. The aqueous solution of carbon dioxide thus obtained is neutralized by passing it through a material containing feldspar minerals, at which time the hydrogen ions of said solution are replaced by ions of alkali or alkaline earth metals, and the aluminum in said material is converted into aluminum compounds that can be separated and utilized.
摘要:
Provided is a method of manufacturing a metal oxide film to be formed through the following processes: a coating process of forming a coating film on a substrate by using a coating liquid for forming metal oxide film containing any of various organometallic compounds; a drying process of making the coating film into a dried coating film; and a heating process of forming an inorganic film from the dried coating film under an oxygen-containing atmosphere having a dew-point temperature equal to or lower than −10° C.
摘要:
A translucent alumina has an alumina content of 99.98% by mass or more and a density of 3.97 g/cm3 or more, and in which the volume percentage of crystal textures having an aspect ratio of 1.5 or less and a long axis length of 10 μm or less is 93% or more.
摘要翻译:半透明氧化铝的氧化铝含量为99.98质量%以上,密度为3.97g / cm 3以上,其中纵横比为1.5以下,长轴长度为10μm的结晶组织的体积百分比 以下为93%以上。