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3003 results about "Composite ceramic" patented technology

High frequency and multi frequency band ultrasound transducers based on ceramic films

A design and a manufacturing method of ultrasound transducers based on films of ferro-electric ceramic material is presented, the transducers being particularly useful for operating at frequencies above 10 MHz. The designs also involve acoustic load matching layers that provides particularly wide bandwidth of the transducers, and also multiple electric port transducers using multiple piezoelectric layers, for multi-band operation of the transducers over an even wider band of frequencies that covers ~4 harmonics of a fundamental band. A transceiver drive system for the multi-port transducers that provides simple selection of the frequency bands of transmitted pulses as well as transmission of multi-band pulses, and reception of scattered signals in multiple frequency bands, is presented. The basic designs can be used for elements in a transducer array, that provides all the features of the single element transducer for array steering of the focus and possibly also direction of a pulsed ultrasound beam at high frequencies and multi-band frequencies. The manufacturing technique can involve tape-casting of the ceramic films, deposition of the ceramic films onto a substrate with thick film printing, sol-gel, or other deposition techniques, where manufacturing methods for load matching layers and composite ceramic layers are described.
Owner:PREXION

Watery acrylic acid insulating mould coating

InactiveCN101519560AImprove friction and scrub resistanceImprove insulation effectFireproof paintsElectricityWeather resistance
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.
Owner:深圳市方浩实业有限公司

Electrothermal composite ceramic brick and preparation method thereof

The invention discloses an electrothermal composite ceramic brick and a preparation method thereof. An electrothermal coating layer, a guiding-out wiring electrode, a coating insulation packaging waterproof layer and an application foaming ceramic layer coat an unglazed surface of a ceramics substrate in order. The electrothermal coating layer coats the unglazed surface of the ceramics substrate in an electrothermal slurry form, the electrothermal slurry permeates the green body of the ceramics substrate, and the penetration depth is less than the thickness of the ceramics substrate and more than 0.5mm. Because of the penetration, the electrothermal coating layer of the electrothermal composite ceramic brick is combined with the ceramics substrate tightly, a surface heating mode is achieved, the thermal efficiency is high, normal and safe usage can be achieved under a voltage of 24-380V, the heating power is 90-120w / m<2>, and the temperature of the ceramics substrate can reach 18-50 DEG C through a temperature control device. The insulation packaging waterproof layer and the foaming ceramic layer outside the electrothermal coating layer can prevent heat from outward transmission effectively, heat loss is lowered, and the whole safety and reliability of the ceramic brick are raised.
Owner:GUANGDONG TIANBI CERAMICS

Composite ceramic filter core and preparation method thereof

InactiveCN102924067AGood mesoporous materialHas a hydrophobic surfaceFiltration separationCeramicwareActivated carbonComposite ceramic
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.
Owner:珠海启月生物科技有限公司

Multifunctional photocatalysis composite ceramic separation membrane as well as preparation method and use thereof

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.
Owner:DALIAN UNIV OF TECH

Preparation method of high-toughness boride-carbide composite ceramic

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.
Owner:吉林长玉特陶新材料技术股份有限公司

Silicon carbide based reinforced composite ceramic and preparation

The invention discloses a reinforced silicon carbide-based composite ceramic and a preparation method thereof. The composite ceramic is characterized by comprising the following components based on weight percentages: 30%-40% of silicon carbide powder, 5%-17% of boron carbide powder, 9%-12% of nano carbon black and 40%-50% of silicon metal. The method comprises the following steps: firstly, ball milling and wet mixing are performed on the silicon carbide powder, the carbon black and the boron carbide powder to obtain mixed powder, and a bonding agent PVB is added for granulation, die pressing is performed for forming; then the formed green compact is dried and put in an air furnace for binder removal; and finally, the obtained green compact is put into a graphite crucible with silicon powder, and siliconizing and sintering are completed after 1-3h heat preservation at 1450-1550 DEG C under a vacuum environment, thus obtaining a sintering body. The boron carbide particle reinforced reaction sintered silicon carbide composite ceramic prepared by the method can be widely used as a structural material under high-temperature atmosphere and corrosive atmosphere, a frictional wear material and the like; and as the composite ceramic has better obdurability and hardness, the ceramic can be used as a substitute material of the traditional reaction sintered silicon carbide.
Owner:珠海亿特立新材料有限公司

Preparation method of silicon carbide/zirconium carbide composite ceramic

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.
Owner:XIAMEN UNIV

Preparation method of lithium lanthanum zirconium oxide nanometer fiber, preparation method of composite film and solid battery application

The invention discloses a preparation method of a lithium lanthanum zirconium oxide nanometer fiber, a preparation method of a composite film and solid battery application. Filamentation is carried out on a lithium lanthanum zirconium oxide precursor solution by using a jet airflow and a propelling plant, and the lithium lanthanum zirconium oxide nanometer fiber is obtained after heat treatment is carried out on the collected lithium lanthanum zirconium oxide fiber precursor. Superfine lithium lanthanum zirconium oxide nanometer powder or a lithium lanthanum zirconium oxide nanometer fiber film with certain mechanical property is obtained respectively by regulating the technological parameters and heat treatment temperature of an airflow spinning process. The method is simple in operation and low in cost, and can realize commercialized production. The composite film of the lithium lanthanum zirconium oxide fiber film and polymer provides a continuous lithium ion passage, so that higher ionic conductivity can be provided. The lithium lanthanum zirconium oxide nanometer fiber powder is used for composite ceramic films or composite electrolytes, blockage for membrane holes can be avoided, and higher ionic conductivity can be provided. A solid battery or lithium-ion battery prepared by using the lanthanum zirconium oxide nanometer fiber film or powder is stable in cycle performance, high in rate capability, low in interface impedance and high in stability.
Owner:UNIV OF SCI & TECH BEIJING

Long-term high-temperature oxidation-resistant multi-element composite ceramic coating for carbon/carbon composite material and preparation and application methods thereof

The invention provides a long-term high-temperature oxidation-resistant multi-element composite ceramic coating for a carbon/carbon composite material and preparation and application methods thereof. The long-term high-temperature oxidation-resistant multi-element composite ceramic coating is a composite coating on the surface of the carbon/carbon composite material and sequentially (from inside to outside) comprises a SiC connection layer prepared with an embedding method, a SiC sealing layer prepared with a chemical vapor deposition method and a SiO2-Y2Si2O7-ZrSiO4-Al2SiO5 ceramic layer prepared with a brush coating method and an in-situ oxidation reaction method, wherein the SiC connection layer is combined with a matrix and exerts the function of connecting the matrix, the SiC sealinglayer exerts the function of filling defects of an inner layer, and the outermost SiO2-Y2Si2O7-ZrSiO4-Al2SiO5 ceramic layer serves as an oxygen blocking layer and exerts the function of self-healing and oxygen blocking. The long-term high-temperature oxidation-resistant multi-element composite ceramic coating has the advantages of firmness in combination with the matrix, no run-through crack, long-term high-temperature oxidation resistance, and capability of being completely applied to the preparation of non-direct-ablation heat-resistant structural members around the head and of the wings ofa hypersonic aircraft and the preparation of a material for the tailpipe chamber of an aircraft engine.
Owner:CENT SOUTH UNIV

Infrared energy-saving coating of high-temperature kiln and preparation method thereof

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.
Owner:CHINA SILICON ZIBOCERAMIC TECH
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