1371 results about "Composite ceramic" patented technology

The invention relates to a watery acrylic acid insulating mould coating comprising the following components with the parts by weight:10-40 of acrylic acid latex, 12-20 of composite ceramic microballon, 5-15 of fillers, 1-15 of pigment, 0.1-1 of accessory ingredient and 15-35 of water. The watery acrylic acid insulating mould coating takes the watery acrylic acid latex as a carrier and contains a large amount of composite ceramic microballon, thereby enhancing the friction resistance and scrub resistance; a coating film generated by the watery acrylic acid latex has the capacities of heat insulation, heat preservation, water prevention, corrosion resistance and sun protection, thereby the watery acrylic acid insulating mould coating can be widely used for metal roofing materials, building materials, pipeline materials, and the like and can effectively reduce the electricity consumption and enhance the comfort level of work and environment. Besides, the watery acrylic acid insulating mould coating has the advantages of good heat insulation and preservation effects, innocuity, environmental protection, simple construction (the same as the construction technology of common water paint), friction resistance, acid-alkali resistance, water resistance, weather resistance, good dirt resistance, high cohering degree, powerful scrub resistance function and longer service life.

The invention relates to a composite ceramic filter core and a preparation method thereof, in particular to a low-temperature sintering and high-strength diatomaceous earth composite ceramic filter core containing multi-walled carbon nanotubes and a preparation method thereof. The composite ceramic filter core comprises, by mass, 60-80% of refined diatomaceous earth, 12-20 parts of activated carbon, 4.5-9 parts of dispersing agent, 2-6 parts of sintering additives, 1-3 parts of antibacterial agents and 0.5-2 parts of carbon nanotubes. According to the low-temperature sintering and high-strength diatomaceous earth composite ceramic filter core containing the carbon nanotubes, due to the fact that the multi-walled carbon nanotubes are evenly distributed in the composite ceramic filter core, mechanical performance of the ceramic filter core can be improved, and the multi-walled carbon nanotubes are of mesoporous structures simultaneously and can perform effective adsorption on remove heavy metal ions in water. In addition, the sintering temperature is reduced to be below 950 DEG C by adding micron-sized metal aluminum powder, natural nano micropores of the diatomaceous earth are reserved, the mechanical strength of the ceramic filter core is further improved, and the compression strength is above 0.5GPa.

A metal-foil-clad composite ceramic board produced by impregnating a sintered substrate (II) of an inorganic continuously porous sintered body (I) having a true porosity of 12 to 50% and an open porosity of at least 10%, with a thermosetting resin (R) under vacuum, to form a resin-imprgnated sintered substrate (IIR), stacking a metal foil on the resin-impregnated sintered substrate (IIR) and press-forming the resultant laminate, wherein the stacked metal foil has a 10-point average surface roughness Rz of 10 mu m or less, and the resin-impregnated sintered substrate (IIR) and the metal foil have substantially no adhesive layer therebetween or have an adhesive layer having a thickness of 10 mu m or less therebetween.

The invention belongs to the technical field of membrane and relates to a photocatalytic composite ceramic separation membrane using porous ceramic membrane as a carrier, a method for preparing the same and application of the separation membrane. The method is characterized in that a porous ceramic membrane substrate is used as the carrier to prepare hydroxyapatite sol and argent-titania composite sol through sol-gel technology; and a carrier membrane is subjected to secondary sol-gel dipping, drying and roasting sequentially to obtain the argent-carried titania/hydroxyapatite photocatalytic composite ceramic separation membrane with aperture of between 100 and 1,900 nm and porosity of between 20 and 55 percent. The photocatalytic composite ceramic separation membrane has biological adsorption and high photocatalytic activity and membrane permeability, improves separation of the composite membrane, photocatalytic degradation and sterilization, has remarkable effects of decontamination and sterilization, reduces the loss of porosity in the process of membrane preparation, has a simple preparation and application process, is easy for large-scale industrial production, integrates three units of membrane separation, photocatalytic degradation and sterilization and reduces investment and occupied area.

The invention discloses a low-abrasion environment-friendly composite ceramic-based friction material which comprises the following components in percentage by weight: 5 to 7 phenolic resin, 5 to 9 nitrile rubber, 2 to 5 aramid fiber, 2 to 6 silicon carbide, 15 to 20 ceramic fiber, 3 to 5 zirconia, 8 to 10 artificial graphite, 3 to 10 molybdenum disulphide, 5 to 15 zirconium silicate, 1 to 3 aluminum oxide, 8 to 10 potassium titanate whiskers, 5 to 15 precipitated barium sulfate, 1 to 3 magnesium oxide, 1 to 3 petroleum coke, 3 to 5 friction powder, 8 to 10 vermiculite and 4 to 9 boron nitride. The invention has the advantages that the friction material manufactured by using the components and the blending ratio has the advantages of no asbestos and brake noise, low wear rate, stable high-temperature brake performance, stable speed reduction brake, lower cost than the similar imported products, and the like.

The invention provides a Zr-Al-Si composite ceramic bead with high wear resistance and high strength and a processing technique thereof. The Zr-Al-Si composite ceramic bead comprises the following components by weight percent: 2-65% of ZrO2, 2-60% of Al2O3, 10-50% of SiO2 and 5% of MgO and mischmetal. The production method comprises the following steps: firstly, evenly mixing zircon sand, zirconia, aluminia, magnesia, kaoline and mischmetal, then carrying out ball milling with a wet method, drying to prepare superfine pulverulent body, rolling and molding, sintering at high temperature, and polishing to obtain the Zr-Al-Si composite ceramic beads with high wear resistance and high strength with the diameter being Phi 0.2mm to Phi 15mm. The prepared ceramic bead has flexibly adjusted density, wide application, wear resistance, stable chemical property and simple process and is easy for scale production.

This invention relates to the micron nanometer composite ceramic die material, and its preparation method. In this invention, micron grade Al2O3 ceramic is used as basic material, added are nanometer grade Ti (C,N) ceramic hard granules as dispersing material, Mo, Ni and MgO as agglutinant assistant. The preparation steps are: the powder of Al2O3 and Ti(C,N) are dispersed in the unified dispersing medium, then being proceeded the ball-milling, drying and hot-pressing sintering. This invention method benefits the dispersing effect of the powder with advantages of: simple operation and low cost. This product can be used for making compressing die or drawing die and the like with its comprehensive mechanical properties and abradability being better than that of prior art ceramic die material.

A preparation method of a high-toughness boride-carbide composite ceramic relates to a preparation method of a boride-carbide composite ceramic and solves the problems that in the conventional preparation of the boride-carbide composite ceramic, due to high sintering temperature and high sintering pressure, the preparation cost is high and the prepared boride-carbide composite ceramic is poor in mechanical property and fracture toughness. The preparation method of the high-toughness boride-carbide composite ceramic comprises the following steps : adding a dispersing medium into boride and carbide; uniformly mixing the dispersing medium, the boride and the carbide; pressing the mixture into a blank material; and sintering the blank material in a two-section pressure-free sintering way at alow temperature and a high temperature sequentially. The sizes and the distribution of grain crystals in the boride-carbide composite ceramic which is prepared under the low-temperature pressure-freeconditions are uniform; the fracture toughness is as high as 5.0-13MPa.m<-1/2>; and the bending strength is as high as 400-1000 MPa; the boride-carbide composite ceramic with excellent comprehensive mechanical property can be prepared; the preparation cost is reduced; and the application range is widened.

The present invention features that the composite ceramic film consists of two layers, the inner layer film of silicon-containing composite Mg-Al oxide and the outer layer film of Mg-Al silico-oxide of 5-70 micron thickness each. The composite ceramic film is formed through surface treatment, degreasing, neutralizing, water washing, micro-arc anodizing, water washing, drying, closing treatment or painting. The composite ceramic film has no holes and cracks, high corrosion resistance, high wear resistance and smooth surface.

The production of low-loss, tunable composite ceramic materials with improved breakdown strengths is disclosed. The composite materials comprise ferroelectric perovskites such as barium strontium titanate or other ferroelectric perovskites combined with other phases such as low-loss silicate materials and/or other low-loss oxides. The composite materials are produced in sheet or tape form by methods such as tape casting. The composite tapes exhibit favorable tunability, low loss and tailorable dielectric properties, and can be used in various microwave devices.

The invention relates to a preparation method of silicon carbide/zirconium carbide composite ceramic, and relates to inorganic nonmetal material composite ceramic. The preparation method comprises the steps of: dissolving bis(cyclopentadienyl) zirconium dichloride with a solvent under the protection of inert atmosphere, and adding liquid hyperbranched polycarbosilane to obtain a mixture A; and distilling the mixture A under reduced pressure under the protection of inert atmosphere to remove the solvent, and carrying out cracking reaction in inert atmosphere to obtain the silicon carbide/zirconium carbide composite ceramic. According to the invention, bis(cyclopentadienyl) zirconium dichloride is used as a zirconium source, and is used for catalyzing the crosslinking reaction of liquid hyperbranched polycarbosilane, so as to increase ceramic yield; zirconium carbide can inhibit the growth of silicon carbide microcrystal grains, and improve high-temperature resistance and oxidation resistance of the composite material; the zirconium content in the composite ceramic can be controlled by controlling the content of bis(cyclopentadienyl) zirconium dichloride in a hybrid precursor; the liquid hyperbranched polycarbosilane/bis(cyclopentadienyl) zirconium dichloride hybrid precursor is free of oxygen, thus the gas escaped in the high-temperature cracking process is reduced; the ceramic has high compactness; and the preparation method is simple to operate, and is easy for engineering.

The invention discloses a crystal glaze and its preparation method and use method. The crystal glaze is prepared by uniformly mixing a basic crystal glaze and one or more coloring agents, wherein the weight of the one or more coloring agents is 0 to 10% of the total weight of the basic crystal glaze and the one or more coloring agents; and the basic crystal glaze mainly comprises 2 to 40 parts of spodumene, 5 to 20 parts of quartz, 5 to 25 parts of calcite, 5 to 25 parts of talcum, 5 to 20 parts of alumina, 1 to 5 parts of zinc oxide, 1 to 3 parts of sodium nitrate, 5 to 15 parts of zircon powder, 1 to 5 parts of bone ash, 1 to 5 parts of lithium carbonate and 5 to 15 parts of boric acid. In melting of the basic crystal glaze of the crystal glaze, the one or more coloring agents are used and thus a composite ceramic tile adopting the crystal glaze has a bright color and strong stereoscopic impression and produces crystal patterns having diameters of 3 to 4 centimeters. The preparation method greatly reduces a firing period of the traditional crystal glaze and realizes industrial production. An experiment proves that a crystal glaze surface with large crystal patterns can be obtained in a firing period of only 75 minutes.

The present invention produces a zirconia-alumina composite ceramic material that exhibits an excellent wear resistance and hardness and that resists chipping at the particle edges. The zirconia-alumina composite ceramic material according to the present invention has a composite structure in which zirconia particles are dispersed in alumina particles and the alumina particles are dispersed in the zirconia particles. A first phase is formed of ceria-containing zirconia particles and a second phase is formed of alumina particles. An α-alumina powder having an average particle size of at least 0.1 μm and a γ-alumina powder having an average particle size of 0.01 to 0.1 μm are used in a proportion of 85:15 to 65:35 as the mass ratio for the alumina powder for producing the alumina particles of the second phase.

The invention relates to the field of infrared radiating ceramics materials, in particular to an infrared energy-saving coating of a high-temperature kiln and a preparation method of the infrared energy-saving coating. The infrared energy-saving coating comprises the following raw materials in parts by mass: 10 to 30 parts of infrared radiating filler, 30 to 40 parts of filling material, 20 to 30 parts of silica sol, 8 to 20 parts of assistant and 10 to 15 parts of water, wherein the infrared radiating filler comprises the following raw materials in parts by mass: 10 to 20 parts of iron sesquioxide, 5 to 10 parts of cobalt oxide, 0 to 30 parts of nickel oxide, 20 to 50 parts of manganese dioxide, and 5 to 10 parts of nanoscale lanthanum oxide. The preparation method comprises the steps of mixing raw materials, diffusing, grinding, homogenizing to reach the average grain size of 350 to 500 meshes, filtering, encapsulating to obtain the product. According to the infrared radiating coating prepared by the method provided by the invention, a multi-phase composite ceramics layer is sintered at a lining of an inorganic kiln during heating; and the infrared radiating coating can be used for a long time at higher temperature, the energy consumption can be saved, and the service life of a kiln can be prolonged.

The invention provides a production method of a nuclear fuel clad element. The method comprises the following steps: selecting an MAX phase ceramic material, silicon carbide, an MAX phase-based composite ceramic material or a silicon carbide-based composite ceramic material, processing the above ceramic material to prepare a slurry, carrying out vacuum defoaming, making a ceramic film with the thickness of 10[mu]m-10mm on a base band through a curtain coating or draw-off process, winding to make a clad element blank, drying, carrying out rubber discharging, sintering, and carrying out surface treatment to obtain the nuclear fuel clad element. The production method has the advantages of simplicity, easy implementation, low cost, overcoming of the disadvantage of difficult processing of ceramic materials, high production efficiency, short cycle and easy industrialization. When the ceramic material is a Ti3SiC2-baed ceramic material, the ceramic material can resist molten fluorine salt corrosion, and can be used as a fluorine salt fuel clad element material in a nuclear reactor, so practical demands of a thorium-based fourth generation fission reactor nuclear energy system on the structure material are met.

The invention relates to a method of preparing a composite ceramic film through micro-arc oxidation and composite deposition, is characterized in that the method includes the following steps: firstly, the workpiece is used as the anode; secondly, other particulates are added to the normal micro-arc oxidation electrolyte; and thirdly a composite deposition is realized while the micro-arc oxidation is conducted. The invention has the advantages that the method changes the history that a composite deposition fails to be conducted for the anodic oxide film, and through the technique, particulates of various types can be added to the electrolyte to change the surface property of the material, wearing resistance, corrosion resistance as well as other special performances are improved, and the application range of the valve metal is enlarged.

The invention discloses a high strength and toughness 3Y-TZP composite ceramic and a preparation method thereof. The 3Y-TZP composite ceramic consists of 3Y-TZP, a SiC crystal whisker and Sr2Nb2O7; and the preparation method of the 3Y-TZP composite ceramic comprises the steps of preparing and mixing Sr2Nb2O7 powder, ball milling, profiling, degumming and sintering. The composite ceramic is obtained by sintering the SiC crystal whisker and a Sr2Nb2O7 ferroelectric material second-phase addictive which are introduced into the 3Y-TZP. The ceramic material with high strength and toughness can be obtained by adjusting the contents of the SiC crystal whisker and the Sr2Nb2O7 and optimizing a microwave sintering process under the synergistic effect of reinforcing by the SiC crystal whisker and toughening by the Sr2Nb2O7 piezoelectric second phase. The invention has reasonable components and simple preparation process and simultaneously achieves the effects of strengthening and toughening by adopting a synergistic technology of reinforcing by the SiC crystal whisker and toughening by the Sr2Nb2O7 piezoelectric second phase. In addition, the invention is applicable for industrial production, effectively improves the mechanical property of the 3Y-TZP ceramic and widens the application field of the 3Y-TZP ceramic.

The invention provides a preparation method of a high temperature foam ceramics, which is characterized in that: zirconium diboride-aluminum oxide composite ceramic powder is prepared into ceramic slurry, polyurethane foaming plastic with certain bore diameter and porosity is soaked into the ceramic slurry so that the ceramic slurry evenly adheres to the surface of the pores of the polyurethane foaming plastic to form a ceramic slurry layer, which are then prepared into a polyurethane foaming plastic ceramic blank, and then are subjected to drying, degreasing and sintering, and the high temperature foam ceramics is prepared. The invention adjusts the high temperature resisting performance of the high temperature foam ceramics prepared by adjusting the ratio of zirconium diboride and aluminum oxide, therefore, the high temperature foam ceramics can resist high temperature and greatly expand working temperature scope; the high temperature foam ceramics prepared by the method can resist high temperature and keep chemical stability under high temperature condition; therefore, in high temperature working environment, the high temperature foam ceramics can be used repeatedly or continuously for the performances of thermal-shock resistance, oxidation resistance, molten steel erosion resistance, and the like, when being used in the filtration of molten steel, showing good performance.

The invention relates to a zirconium oxide composite ceramic and a preparation method thereof. The zirconium oxide composite ceramic is prepared from, by mass, 65%-80% of a zirconium oxide matrix, 10%-30% of a conducting material and 2%-11% of a nanometer reinforcing material; the conducting material is selected from at least one of a non-ferrous metal oxide, a white metal oxide, a compound with a titanium structure and a compound with a spinel structure, wherein the non-ferrous metal oxide is selected from at least one of CuO, Cu2O, V2O5, NiO, MnO, MnO2, CoO, Co2O3, Co3O4, Fe2O3, FeO, Fe3O4 and Cr2O3, and the white oxide is selected from at least one of ZnO, SnO2 and TiO2; the compound with the titanium structure is selected from at least one of CaTiO3, BaTiO3, LaCrO3, LaSr(0.1)Cr(0.9)O3, SrTiO3 and LaFeO3, and the structural formula of the compound with the spinel structure is AB2O4, wherein A is selected from at least one of Mg, Fe, Zn and Mn, and B is selected from at least one of Al, Cr and Fe. The zirconium oxide composite ceramic is excellent in antistatic property and high in mechanical property.

The invention provides a method for preparing yttrium aluminium garnet (YAG) transparent ceramic with a composite structure. The method comprises the following steps: by using Re:YAG powder and high-purity Y2O3, Al2O3 and Re2O3 as raw materials, adding a certain amount of dispersing agent, binder, plasticizer and defoaming agent to mix slurry in a ball-milling manner; preparing different doped and bound composite structures of ceramic biscuits, such as Sm:YAG/Nd:YAG, Cr:YAG/Yb:YAG and YAG/Nd:YAG, different multi-segment doped Re:YAG ceramic biscuits, such as YAG/Cr:YAG/Nd:YAG/YAG, a core-shell structured composite ceramic biscuit, and a layered composite structure of transparent ceramic biscuit in a vacuum pressure slip casting manner. Different composite structures of Re:YAG transparent ceramics are obtained by the following processing steps: biscuit degreasing, vacuum sintering, hot isostatic pressing sintering, annealing and the like. The linear transmittance of the transparent ceramic after being polished at double sides in a visible near infrared region can be up to over 80%.

The invention discloses a hollow fiber membrane reactor for gaseous oxidation reaction, a preparation method and application thereof. The membrane reactor is made of a compact hollow fiber oxygen permeation membrane, wherein the wall thickness of a pipe is between 0.1 and 0.3mm, and the outer pipe diameter is between 1 and 3mm; the oxygen permeation membrane is made of a dual-phase composite ceramic oxygen permeation membrane material which is prepared by mixing an electron conductive phase material and an ion conductive phase material in a volume ratio of 0.43-1.5:1; the electron conductive phase material is provskite-type chromic lanthanum composite oxide (Ln1-xAx)1-zCr1-yByO3 and/or strontium titanate-based composite oxide (LnxSr1-x)1-zTi1-yByO3; and the ion conductive phase material is stabilized fluorite type zirconium dioxide Zr1-x1Rx1O2-delta, or doped cerium dioxide R'z1Ce1-z1O2-delta. The method for preparing the membrane reactor comprises the following steps: mixing the electron conductive phase material and the ion conductive phase material in the volume ratio of 0.43-1.5:1 to prepare a hollow fiber membrane blank by adopting a wet phase inversion method; and sintering the blank at the temperature of between 1,300 and 1,600 DEG C for 10 to 18 hours. The membrane reactor has high oxygen permeation performance, excellent high temperature reduction resistance and long-term stability and low production cost.

The present invention discloses a low cost preparation method for a needle punched fabrics reinforced quartz composite ceramic radome. The method comprises the following steps: designing a core mold based on a geometry size of a radome, and punching on the core mold by using quartz cloth and quartz felt through a needle punching method to form a fabric, wherein the profiling structure with the corresponding geometry size is punched on the fabric; carrying out treatments of boiling with boiling water, baking, pickling, repeated impregnation, drying, demolding, repeated impregnation, drying, and heat treatment on the fabric, wherein the fabric is completely ceramized into a blank; carrying out mechanical processing on the blank until a desired product size is achieved, wherein the product is the quartz composite ceramic radome. Practice shows that the radome product cost is substantially reduced by reducing raw material cost and weaving cost and shortening production cycle under circumstances through the method of the present invention, wherein the circumstances comprise that mechanical property and electrical property of materials meet use requirements.

A platform cooling system usable in a turbine engine together with an airfoil for preheating cooling fluids before the cooling fluids enter a cooling system in the airfoil in a turbine engine. The platform cooling system includes cooling channels in either the ID or OD platforms, or both, of the airfoil. The channels transfer heat to the cooling fluids flowing through the platform cooling system and thereby heat the cooling fluids. The preheated cooling fluids are particularly useful with cooling composite ceramic airfoils, which are susceptible to damage from large temperature gradients developed between combustion gases outside the airfoil and cooling fluids inside the airfoil. The platform cooling system may be combined with an airfoil cooling system to create a serial cooling system in which cooling fluids may enter the platform and flow through the platform and airfoil without being supplemented with additional cooling fluids along the flow path.

The invention discloses a boron carbide based composite ceramic and a preparation method thereof. The boron carbide based composite ceramic comprises the following compositions by weight percentage: 45 to 50 percent of boron carbide powder, 5 to 8 percent of phenolic resin, and 42 to 50 percent of metallic silicon. After the compositions are weighed, the phenolic resin is dissolved by alcohol first, and the boron carbide powder is added for mechanical ball milling to be mixed evenly; a granulator is used for granulation, and a green body with a shape of the needed product is obtained through compression molding; the compressed green body is placed into a baking oven for drying solidification; the weighed metallic silicon is added into a graphite crucible, the solidified green body is placed on the metallic silicon and is placed into a high-temperature vacuum sintering furnace for sintering along with the crucible, the sintering temperature is between 1,550 and 1,700 DEG C, and the green body is cooled with the furnace after the thermal insulation for 1 to 3 hours to obtain the boron carbide based composite ceramic. The phenolic resin plays a role in an adhesive and a carbon source during the preparation of the composite ceramic, and can also play a role in providing the green body with excessive air holes during the sintering, so that the infiltrability of silicon is improved.

A composite ceramic substrate for receiving an ejection head chip for a micro-fluid ejection head and a method for making the composite ceramic substrate. The substrate includes a high temperature previously fired ceramic base having a substantially planarized first surface and at least one fluid supply slot therethrough. A low temperature co-fired ceramic (LTCC) tape layer bundle having at least two LTCC tape layers is attached to the ceramic base at an interface between the LTCC tape layer bundle and the first surface of the ceramic base. The LTTC tape layer bundle has at least one chip pocket therein and at least one of the LTCC tape layers includes a plurality of conductors.

This is a kind of Al2O3/ZrO2(Y2O3) nanometer compound ceramics knife material and its producing method. The material components include substance material and tenacity increasing phase. The substance material is Al2O3, and its grain granularity is 60 - 200 nm; according to volume percentage, its content is 65% - 90%, and the tenacity increasing phase ZrO2(Y2O3) nanometer powder containing 1.5% - 3.5% Y2O3 according to mol percentage; its grain granularity is 50 - 100 nm, and according to volume percentage, its content is 10% - 35%; its producing craft steps include producing substance material and nanometer powder of tenacity increasing phase by hydrochemistry method, produce grains, prepare material, ball mill to mix material, flan equal static pressure molding and sinter. The anti-bending strength of the prepared ceramics knife material ªÊ= 750 - 950 MPa, the fracture toughness KIC = 7.8 - 9.6 MPaíñm1/2, Weibull modulus m = 10 - 11.7, and durable intensity can get to 4 - 6 hours.

The invention relates to a nano Al2O3 and MgO composite oxide ceramic bonded spinel-magnesia fireproof casting material and a preparation method thereof. Al(OH)3 and Mg(OH)2 composite sol suspension is used as a nano ceramic bond, directly added into a mixture and subjected to in-situ synthesis reaction to form a nano structural matrix using spinel and magnesia as main components so as to form the nano spinel-magnesia fireproof casting material. The mixing materials of the casting material are characterized in that the spinel is used as aggregate or proper amount of sintered magnesia of less than or equal to 5 millimeters is added into the spinel aggregate to improve the total MgO content of the casting material; and the matrix material consists of a nano ceramic bond system, magnesia, little AlO3 with different properties and admixture, wherein after the synthesis reaction of the secondary spinel, the matrix material swells and is densified under constraint so as to cause the improvement of macrostructure and microstructure, improvement of performance and enhancement of durability and form the spinel-magnesia casting material with more excellent corrosion resistance and soakage resistance. The casting material is used in slag lines in integral secondary refining ladles, and obtains good using effect.

The invention discloses a method for preparing a ceramic body. The method comprises the following steps: water is used as a solvent, and water-soluble polybutadiene vinyl polymer is added to the solvent to prepare ceramic slurry; the prepared ceramic slurry is injected into a forming mold, and self-gel in-situ solidification is conducted at the temperature of 15 DEG C-40 DEG C in the air; and demolding and drying are conducted after sufficient solidification. Due to the fact that the self-gel in-situ solidification is carried out on the water-soluble polybutadiene vinyl polymer which has the functions of a dispersing agent and a gel reagent at the same time, and is low in toxicity, low in cost and easy to obtain to prepare the ceramic body, preparation cost is greatly reduced and pollution is reduced. Moreover, the method is simple in preparation technology, free of oxygen inhibition, capable of being operated in the air and free of harsh operating conditions and equipment requirements. Besides, the prepared ceramic body is high in intensity, good in toughness, bright and clean in surface, free of exfoliation and suitable for preparation of various oxide ceramics, oxide ceramics, composite ceramics and ceramics with complex shapes, and thus the method for preparing the ceramic body has industrial application prospects.

A composite ceramic board comprising an insulating board of insulating layers of alumina ceramics and dielectric layers of ceramics having a dielectric constant smaller than at of said insulating layers which are fired as a unitary structure, and metallized wirings of a low-resistance conductor such as of Au, Ag, Cu or Pt formed on the surfaces and inside thereof, and a method of producing the same. The composite ceramic board not only has a large strength and a high thermal conductivity but also exhibits excellent high-frequency chararteristics and is suited for use as a high-frequency wiring board. The invention further provides an optical/electronic-mounted circuit substrate using the above board, and a mounted board having the circuit substrate of the invention connected to an electronic circuit formed on a mother board.

The invention particularly relates to a composite ceramic mold core for a water pump impeller and a preparation method thereof, which belong to the technical field of material machining engineering. The composite ceramic mold core is characterized by comprising the following components in part by mass: 12 to 14 parts of silica sol in which the mass percent of SiO2 is 30 percent, 32 to 36 parts of 280 to 400-mesh refractory material powder, 2 to 4 parts of glass fiber chopped strand with the length of between 3 millimeter and 5 millimeters, 15 to 17 parts of antifoaming agent, 1 to 2 parts of breakdown agent and 1 to 2 parts of grain refiner, wherein the breakdown agent in the raw materials is edible glucose powder. The invention has the advantages that: 1) the stability of a coating is stable, and the high-temperature performance of a prepared mold shell is high; 2) casting defects such as sand holding and the like can be effectively avoided in an impeller casting process; 3) the preparation and service performance of the composite ceramic mold core can be effectively enhanced; 4) a manufacturing process of the mold core is easy, and is convenient to operate; and 5) the high-temperature performance of the mold core is high. After being baked, the composite ceramic mold core has the characteristic of water solubility, and can be removed by water.