摘要:
A method of manufacturing a composite material, the method comprising: (i) providing a ceramic powder comprising ceramic agglomerates, the agglomerates having an intra-agglomerate void volume space; (ii) providing a polymer; (iii) mixing the polymer with the ceramic powder to form a mixture comprising the agglomerates at least partially impregnated with the polymer, wherein the volume of polymer in the mixture is at least 80% of the total intra-agglomerate void volume space, but less than 130% of the total intra-agglomerate void volume space; (iv) optionally shaping the mixture to form a preform; (v) and treating the mixture to provide ceramic agglomerates which are at least partially impregnated with solid polymer.
摘要:
A high-quality resistor pattern and conductor pattern is formed on an external surface of a multilayer ceramic substrate by an ink jet method. A composite sheet including a first ceramic green layer and a shrinkage-retardant layer is formed, and a resistor pattern and a conductor pattern are formed on the first ceramic green layer of the composite sheet by an ink jet method. Subsequently, a plurality of second ceramic green layers are stacked with the composite sheet such that the shrinkage-retardant layer of the composite sheet defines an outermost layer, thus forming a multilayer composite including an unfired multilayer ceramic substrate and the shrinkage-retardant layer. Then, the multilayer composite is fired, and the shrinkage-retardant layer is removed to obtain a sintered multilayer ceramic substrate.
摘要:
A method of forming a three dimensional fibre structure is disclosed which comprises the steps of a) providing a starting material which comprises liquid carrier, fibres and binder; b) passing the starting material over a substrate so as to deposit fibres onto the substrate; c) forming a three dimensional fibre matrix; and d) curing the binder. The flow of material onto the substrate may be controlled such that the flow of a starting material over the substrate is chaotic and fibres are laid down in a three dimensional structure containing a high proportion of voids. The preform may be pressurised while moist and is cured under pressure. The fibres may comprise carbon fibres; recycled carbon fibre has been found to be particularly useful. The resulting preform may be stochastic and is suitable for use in ablative and braking applications.
摘要:
A NOx sensor 100 is produced by forming a stack with a ceramics paste including ceramic particles, a resin, a solvent, and one or more additives selected from additives of a first group having a first structure containing one or more selected from ether structures, urethane structures, hydroxy group-containing structures, ester structures, and acrylic structures and additives of a second group having any one or more structures of the additives of the first group and a second structure containing one or more selected from imidazoline structures, ethylenediamine structures, and amine structures. The ceramics paste contains any one of the additives of the first group and the second group and thus has an appropriate affinity for a cutting edge at the time of cutting a laminated body before the firing of the NOx sensor 100.
摘要:
Disclosed is a composition, in particular a dispersion, which contains nanofiber material in at least one organic matrix component, said nanofiber material being pre-treated in at least one method step for adjusting the physical properties of the composition.
摘要:
The invention relates to a process for obtaining a porous material made of recrystallized SiC, especially in the form of a structure for filtering a particulate-laden gas, starting from at least two powders of fine and coarse SiC particles, blended with an organic material comprising an organic pore former and/or a binder, in suitable proportions and in the presence of a sufficient amount of a solvent, such as water, so as to allow forming of said blend and firing thereof between 1600° C. and 2400° C., said process being characterized in that the difference between the percentile d90 of the coarse particle powder and the percentile d10 of the fine particle powder multiplied by the volume of organic material in the initial blend, expressed as a percentage relative to the total volume of the SiC particles, is between 250 and 1500.The invention also relates to the porous material made of recrystallized SiC that can be obtained by said process.
摘要:
A ceramic compact having a patterned conductor is obtained by coating the patterned conductor with a slurry and then by hardening the slurry. The slurry is prepared by mixing a thermosetting resin precursor, a ceramic powder, and a medium. In the ceramic compact, an isocyanate- or isothiocyanate-containing gelling agent and a hydroxyl-containing polymer are reacted and hardened to produce a thermosetting resin. The hydroxyl-containing polymer is preferably a butyral resin, an ethylcellulose-based resin, a polyethyleneglycol-based resin, or a polyether-based resin.
摘要:
A high-quality resistor pattern and conductor pattern is formed on an external surface of a multilayer ceramic substrate by an ink jet method. A composite sheet including a first ceramic green layer and a shrinkage-retardant layer is formed, and a resistor pattern and a conductor pattern are formed on the first ceramic green layer of the composite sheet by an ink jet method. Subsequently, a plurality of second ceramic green layers are stacked with the composite sheet such that the shrinkage-retardant layer of the composite sheet defines an outermost layer, thus forming a multilayer composite including an unfired multilayer ceramic substrate and the shrinkage-retardant layer. Then, the multilayer composite is fired, and the shrinkage-retardant layer is removed to obtain a sintered multilayer ceramic substrate.
摘要:
A suspension of inorganic particles, a copolymer comprising soft segments and hard segments, and a solvent may be extruded through a spinnerette to produce inorganic/organic composite hollow precursor fibers. The precursor fibers may be sintered. The fibers may be utilized in a gas separation module for separation of a gas mixture or production of syngas. The fibers may be installed in the gas separation module after sintering or they may be sintered after installation.
摘要:
The method of the present invention for producing a solid electrolyte sheet for a solid oxide fuel cells is characterized in comprising steps of obtaining a large-sized thin zirconia green sheet by molding and drying a slurry containing zirconia particles, a binder, a plasticizer and a dispersion medium; pressing the zirconia green sheet in the thickness direction with a pressure of not less than 10 MPa and not more than 40 MPa; firing the pressed zirconia green sheet at 1200 to 1500° C.; and controlling a time period when a temperature is within the range of from 500° C. to 200° C. to not less than 100 minutes and not more than 400 minutes when cooling the sheet after firing.