347 results about "Cordierite" patented technology

The invention relates to the technical field of ceramic clay, in particular to wear-resistant ceramic clay and a preparation method thereof.The wear-resistant ceramic clay is prepared from, by weight, 35-40 parts of kieselguhr, 15-20 parts of silicon carbide, 8-12 parts of modifier based on mullite modification, 5-8 parts of modified cordierite agent, 4-7 parts of aluminum oxide, 4-7 parts of calcined talc, 3-5 parts of potassium feldspar and 30-35 parts of water. According to the wear-resistant ceramic clay disclosed by the invention, the diatomite and the silicon carbide are matched with the aluminum oxide, the calcined talc and the potassium feldspar, and the modifier based on mullite modification and the modified cordierite agent are added, so that the wear resistance, the stain resistance and the heat-conducting property of the obtained ceramic clay are coordinated and improved through co-blending and matching of the raw materials and mutual enhancement and improvement of the raw materials; meanwhile, the product is remarkable in anti-damage stability effect.

The invention provides an anti-corrosion ceramic sagger and a preparation method thereof.The anti-corrosion ceramic sagger comprises an aggregate layer and a matrix layer, and the aggregate layer is prepared from, by mass, 30-50 parts of yttrium-stabilized zirconia, 20-30 parts of silicon carbide and 15-25 parts of magnesium aluminate spinel; the matrix layer is prepared from the following raw materials in parts by mass: 40 to 50 parts of mullite micro powder, 30 to 40 parts of cordierite micro powder and 10 to 20 parts of binding agent. According to the anti-corrosion ceramic sagger and the preparation method thereof, by optimizing the raw material ratio and the preparation process, the corrosion depth is smaller than or equal to 0.19 mm after the sagger is soaked in the molten salt environment at 900 DEG C for 72 h, the service life is prolonged by 6-8 times compared with that of a traditional corundum sagger, and the anti-corrosion ceramic sagger has wide application prospects.

A high-strength, highly transparent nanocrystalline glass, a preparation method therefor, and a use thereof. The high-strength, highly transparent nanocrystalline glass uses precursor minerals mainly comprising synthetic aluminum-rich feldspar-like ceramic glass material, β-spodumene material, cordierite material, synthetic β-dicalcium silicate material, and magnesium aluminum spinel material for the main body of a feldspar-like matrix glass having a stable structure. Ultrafine zirconia powder having a particle size of less than 10 nm is used as a nucleating agent and microcrack damping and pinning agent, to control the formation of nanocrystals smaller than 100 nm in the glass body formed after melting. The volume percentage content of the nanocrystals is 50%-95%, and the nanocrystals together with the matrix glass form a high-strength, highly transparent nanocrystalline glass having a uniform microstructure. The obtained nanocrystalline glass has high hardness, high fracture toughness and high light transmittance, and is suitable for manufacturing various types of optical glass.

According to the low-expansion ceramic fiber board and the preparation method thereof, high-purity aluminum silicate fibers and refined cordierite powder are compounded, and the nanoscale permeation effect of ammonia type silica sol is combined, so that the fibers and the powder form a three-dimensional network bonding structure, and the thermal expansion coefficient is reduced; the wettability of the combination of the fibers and the powder is remarkably improved by a pre-dispersion process of the cationic starch, and the block mass rate is reduced; the vacuum-assisted compression molding and the gradient calcining process are synergistic, so that the density uniformity of the product is improved, and high-temperature cracking is avoided.

The invention relates to the technical field of ceramic materials, in particular to a ceramic material and a preparation method and application thereof. The invention provides a ceramic material, which is prepared from the following raw materials in percentage by mass: 5 to 30 percent of ball clay, 5 to 25 percent of purple grit mud, 10 to 35 percent of mullite, 15 to 40 percent of cordierite and 3 to 10 percent of pore forming agent. The ceramic material has the characteristics of good heat storage property, impact resistance and light weight. The pizza stone plate can be comparable with a high-grade pizza stone plate made of natural volcanic materials.

The invention belongs to the technical field of denitration catalysts, and discloses a CO-SCR denitration catalyst and a preparation method and application thereof. The preparation method comprises the following steps: (1) putting honeycomb cordierite into a muffle furnace for preliminary calcination to obtain a carrier; (2) immersing the carrier into a mixed solution containing an aluminum source and an alkaline nitrogen source for hydro-thermal treatment, taking out the carrier after hydro-thermal treatment, and washing and drying to obtain a surface modified carrier; (3) preparing a bottom layer coating solution containing catalyst powder and a first pore-forming agent; preparing a surface layer coating solution containing catalyst powder and a second pore forming agent; wherein the average particle size of the first pore-forming agent is larger than that of the second pore-forming agent; (4) immersing the surface modified carrier into the bottom layer coating liquid for coating, carrying out primary drying, then immersing the surface modified carrier into the surface layer coating liquid for coating, and carrying out drying treatment to obtain a catalyst precursor; and (5) calcining the catalyst precursor to obtain the CO-SCR denitration catalyst.

The invention relates to the field of fire-resistant and heat-insulating bricks, and discloses a multifunctional fire-resistant and heat-insulating brick and a manufacturing process thereof. Comprising the following raw materials in parts by weight: 10-15 parts of silicon carbide, 10-20 parts of mullite, 5-10 parts of cordierite, 30-40 parts of aluminum oxide, 5-10 parts of zirconium oxide, 2-4 parts of titanium dioxide nanoparticles, 6-9 parts of a cleaning agent, 3-5 parts of yttrium oxide and 1-12 parts of a micropore forming agent. By adding manganese oxide and cerium oxide, when the surface of the brick body is in contact with reducing substances or impurities, the oxidation reaction of the reducing substances or impurities can be promoted, and the impurities are converted into oxides which are easy to remove, so that the high-temperature oxidation self-cleaning function is realized, and the capability of keeping the brick body clean and stable in performance in a complex high-temperature environment is enhanced; brick body corrosion and performance degradation caused by impurity deposition are reduced, and therefore the problem that in a high-temperature industrial environment, dirt and impurities are prone to being attached to the surface of a traditional fire-resistant heat-insulating brick, and the heat-insulating performance of the traditional fire-resistant heat-insulating brick is affected is solved.

The invention discloses a preparation method of high-performance cordierite DPF honeycomb ceramic, and belongs to the technical field of honeycomb ceramic carrier preparation. The preparation method comprises the following steps: mixing raw materials; kneading mud; performing extrusion molding; drying and shaping; cutting and firing to obtain a cordierite honeycomb ceramic carrier; and performing boundary dimension processing, film covering, hole dotting, mud scraping and drying to obtain a finished product. According to the invention, aluminum hydroxide is adopted to replace or partially replace aluminum oxide in the formula of the cordierite porous ceramic structure while magnesium hydroxide is used, and the two substances can form a synergistic heat absorption mechanism by virtue of the difference of the aluminum hydroxide and magnesium hydroxide in thermal decomposition temperature, so that the heat absorption efficiency of the cordierite porous ceramic structure is greatly improved in the low-temperature coke discharge stage of a carrier mud blank. Aluminum hydroxide is subjected to a decomposition reaction before magnesium hydroxide, and then magnesium hydroxide is continuously decomposed at a higher temperature, so that the temperature range covered by the whole heat absorption process is greatly widened, the heating rate of the carrier mud blank is effectively slowed down, and thermal shock caused by sudden rising of local temperature is avoided.

The invention discloses low-expansion cordierite ceramic prepared from chlorite and a preparation method of the low-expansion cordierite ceramic. The low-expansion cordierite ceramic is prepared from the following chemical components in percentage by mass: 47.3 to 48.8 percent of SiO2, 37.6 to 39.1 percent of Al2O3, 0.5 to 0.6 percent of CaO, 12.35 to 13.4 percent of MgO, 0.05 to 0.1 percent of Fe2O3, 0.01 to 0.02 percent of K2O, 0.003 to 0.009 percent of Na2O and 0.16 to 0.21 percent of TiO2. The preparation method comprises the following steps: 1, taking chlorite as a raw material, and adding kaolin and aluminum oxide to prepare a cordierite precursor; step 2, adding fused quartz into the cordierite precursor prepared in the step 1 to prepare mixed powder; and 3, molding the mixed powder obtained in the step 2, and firing to obtain the low-expansion cordierite ceramic.

The invention discloses a preparation method of ultra-smooth low-expansion ceramic glaze for in-situ generation of cordierite, bismuth oxide and antimony oxide are introduced into a high-potassium low-sodium system to form a K-Mg-Sb-Bi multi-element eutectic system, so that the low thermal expansion property and the smooth property of the glaze are realized; in-situ precipitation of cordierite microcrystals in a glaze glass phase is more successfully guided, so that a ceramic glaze surface with excellent comprehensive performance is obtained.

The invention relates to high-strength and high-transparency nano glass ceramic and a preparation method and application thereof, and the high-strength and high-transparency nano glass ceramic is prepared from a synthetic aluminum-rich feldspar ceramic glass material, a beta-spodumene material, a cordierite material, a synthetic beta-dicalcium silicate material and a magnesium aluminate spinel material. According to the present invention, a stable-structure feldspar matrix glass is adopted as a main body precursor mineral material, zirconia micro-powder with a particle size of less than 10 nm is adopted as a nucleation agent and a micro-crack damping pinning agent, nanometer microcrystals with a particle size of less than 100 nm are controlled to be generated in a glass body formed after melting, and the nanometer microcrystals account for 50-95% by volume; the high-strength and high-transparency nanocrystalline glass with a uniform microstructure is formed and woven with matrix glass in a symbiotic manner. The prepared nano microcrystalline glass has the advantages of high hardness, high fracture toughness resistance and high light transmittance, and is suitable for manufacturing various optical glass.

A pillar-shaped honeycomb structure, comprising an outer peripheral side wall; first cells having an opening on the first end surface and having a sealing portion on the second end surface; and second cells adjacent to the first cells with partition walls interposed therebetween and having a sealing portion on the first end surface and having an opening on the second end surface; wherein the outer peripheral side wall, the partition walls, and the sealing portions are fired, and comprise cordierite as a main component and one or more sintering aids selected from ceria, zirconia, and titania; wherein in the partition walls, assuming an average porosity of a portion in a range A, and a portion in a range B is P1 (%); and assuming an average porosity of a portion in a range C is P2 (%), −4≤P1−P2≤7 is satisfied.

The invention relates to a catalyst for treating nitrogen-containing VOCs and application thereof in treatment of nitrogen-containing VOCs, the main preparation steps are as follows: a carrier component containing Si, Al and optional Mg, a cross-linking agent, a rare earth oxide and water are put in a ball mill for ball milling to prepare coating slurry, the coating slurry is coated in cordierite honeycomb ceramic channels by a vacuum coating method, and the catalyst is prepared. And then the coated honeycomb ceramic is quickly dried. Preparing a metal nitrate solution as an impregnation liquid, impregnating the nitrate on the dried honeycomb ceramic, aging, quickly drying the impregnated honeycomb ceramic, and roasting the dried honeycomb ceramic for a certain time to obtain the catalyst. According to the preparation method disclosed by the invention, the catalyst for treating the nitrogenous VOCs, which is formed in a honeycomb manner, low in preparation cost, relatively high in N2 selectivity, good in catalytic oxidation effect and high in stability, can be produced, so that the problems of long technological process, short service life of the catalyst, secondary pollution of NOx and the like in the conventional process for treating the nitrogenous VOCs are solved.

The invention relates to the technical field of batteries, in particular to a positive pole piece, a preparation method thereof and a battery. The positive pole piece comprises a current collector; the first positive electrode active material layer is arranged on the surface of at least one side of the current collector along the thickness direction, and the first positive electrode active material layer comprises a first positive electrode active material; the second positive electrode active material layer is arranged on the surface, far away from the current collector, of the first positive electrode active material layer, and the second positive electrode active material layer comprises a second positive electrode active material; the safety layer is arranged on the surface, far away from the first positive electrode active material layer, of the second positive electrode active material layer, and the safety layer comprises cordierite. According to the positive pole piece, the safety, the structural stability and the electrochemical performance of the battery can be improved.

The invention discloses a whisker-reinforced composite porous ceramic material as well as a preparation method and application thereof, which are based on a new process of combining silicon carbide and cordierite and are combined with factors such as silicon carbide particle size and sintering conditions to really realize effective combination of low thermal expansion characteristic of cordierite and high strength characteristic of silicon carbide. The invention aims to synchronously improve the thermal shock resistance and mechanical bearing capacity of a product so as to provide a DPF filter body material with better performance. Furthermore, in order to optimize the filtering performance, mullite whiskers grow in the composite matrix in situ, and a more efficient particulate matter trapping network is constructed, so that the mechanical reliability, the thermal stability and the filtering efficiency are synergistically improved.

To provide a ceramic body having a high porosity, a relatively large median pore diameter, a narrow pore size distribution, and a relatively low CTE, and a method for producing the ceramic body.SOLUTION: In a ceramic body, %P≥50% (where %P is an average bulk volume porosity) and df≤0.36 (where df is (d50-d10) / d50). The ceramic body contains a crystalline phase containing a total weight percentage of at least 85 wt.% of cordierite and indialite, and contains a crystalline phase containing up to 10 wt.% of a pseudobrookite structure. The ceramic body comprises, when expressed as a weight percentage based on oxides: 1 wt.% to 11 wt.% of titania, and 89 wt.% to 99 wt.% of MgO, Al2O3, and SiO2.SELECTED DRAWING: Figure 3

Provided are spherical composite oxide particles having high crystallinity, white color, and low coefficient of thermal expansion. The composite oxide particles according to the present invention are polycrystalline, the main crystal phase contains cordierite and / or hexagonal cordierite, and the coefficient of thermal expansion of the composite oxide particles according to the TMA method is 1.5 ppm or less.

The invention relates to the field of catalysts. The invention relates to a catalyst for catalytic oxidation of carbon monoxide in industrial sulfur-containing flue gas. A carrier is a cordierite honeycomb ceramic carrier coated with activated aluminum oxide (Al2O3), silicon oxide (SiO2) or titanium oxide (TiO2), or a honeycomb carrier with titanium oxide as a skeleton; the noble metal active component is selected from one or a combination of more of palladium (Pd), platinum (Pt) and rhodium (Rh), the total loading capacity accounts for 0.05-0.4 wt% of the mass of the carrier, and the noble metal component is loaded on the surface layer of the carrier at the depth of 10-300 microns and is of an eggshell type distribution structure; the cocatalyst component is selected from one or a combination of more of vanadium oxide (VO), tungsten oxide (WO), cerium oxide (CeO), molybdenum oxide (MoO) and lanthanum oxide (La2O3) and is uniformly distributed on the carrier. Unification of activity, stability and economical efficiency of the catalyst is achieved, the problems that a catalytic oxidation catalyst is prone to inactivation, low in activity and high in cost in complex sulfur-containing flue gas are solved, and the industrial application value is remarkable.

The invention discloses a flame-retardant polyolefin elastomer material, which is prepared from the following raw materials in parts by weight: 20 to 30 parts of polyolefin elastomers, 8 to 12 parts of modified cordierite agents, 6 to 12 parts of flame retardants, 7 to 11 parts of linear low-density polyethylene, 2 to 6 parts of silane coupling agents KH560, 2 to 5 parts of antioxidants and 3 to 5 parts of modified clay. According to the flame-retardant polyolefin elastomer material, the polyolefin elastomer is matched with the linear low-density polyethylene, the silane coupling agent KH560, the antioxidant, the flame retardant and other raw materials, meanwhile, the modified cordierite agent and the modified clay are added for mutual blending and synergistic effect, and through improvement of the raw materials, the obtained polyolefin elastomer material is coordinately improved in flame retardance and mechanical property, and the flame-retardant performance of the polyolefin elastomer material is greatly improved. And the weather-resistant stability effect of the product is remarkable.

The present invention discloses a pink ceramic glaze and a process for preparing ceramic products therefrom, belonging to the technical field of ceramic glazes. The pink ceramic glaze of the present invention comprises a glaze main body and a pink ceramic pigment. Among them, the glaze main body comprises the following components: Longyan kaolin, potassium feldspar, sodium feldspar, almandine, andalusite, baddeleyite, cancrinite, chiastolite, silicon dioxide, chalcopyrite, cordierite, dolomite, and sodium humate. The pink ceramic products prepared therefrom use the glaze main body as the main material, in combination with the pink ceramic pigment, that is, the colorant uses a commercially available pink ceramic pigment. Moreover, the glaze main body is applicable to most of the pink ceramic pigments, is easier to operate in actual production, has a remarkable visual effect on the glaze surface, and at the same time has excellent properties such as glaze surface strength.

This invention discloses a high-strength ceramic valley-peak structured corrugated filler, the raw materials of which include clay, kaolin, potassium feldspar powder, cordierite powder, zirconium dioxide powder, reinforcing granular powder, bauxite, and a binder. The corrugated filler material prepared by the method described in this invention has good strength, making it less prone to breakage during stacking or use, thus improving the usability and durability of the corrugated filler.

The invention discloses self-adaptive adjustment cordierite honeycomb ceramic forming equipment, and relates to the field of cordierite honeycomb ceramic forming processing. The device comprises a forming mechanism and a receiving and cutting mechanism, and the forming mechanism stably supports an extrusion forming device through an L-shaped supporting frame; the bearing cutting mechanism comprises a bearing base, a supporting assembly, an angle adjusting assembly, a position adjusting assembly and a cutting part, the supporting assembly supports the position adjusting assembly through an L-shaped mounting base, the position adjusting assembly can flexibly adjust the spatial position of the angle adjusting assembly, and the angle adjusting assembly can adjust the overall or local bearing angle of the bearing table; and the cutting component can synchronously complete cutting. The equipment solves the problems that existing equipment is unstable in supporting, inflexible in adjustment, low in machining efficiency and the like, and the forming precision, the adaptability and the machining efficiency are improved.

The invention discloses high-whiteness unglazed ice jade porcelain and a preparation method thereof, and belongs to the technical field of ceramics. The high-whiteness unglazed ice jade porcelain is prepared from the following components: quartz, potassium feldspar, albite, Longyan kaolin, sodium bentonite, aluminum oxide, yttrium oxide, zirconium oxide, cordierite and modified nano zeolite powder. The prepared high-whiteness unglazed ice jade porcelain is high in whiteness, free of spots and flaws on the surface and high in yield.

The application provides a cordierite-based supported ozone catalyst and a preparation method and application thereof. The prepared supported ozone catalyst can well balance excellent COD removal rate and good mechanical properties when used for treating organic wastewater, especially high-salt organic wastewater in the field of coal chemical industry. The preparation method comprises the following steps: 1) pretreating porous cordierite in an acid solution, then cleaning and drying to obtain a carrier; 2) applying a coating liquid on the carrier, then drying to obtain a precursor; the coating liquid comprises an active component, silica sol and optional starch; the active component comprises MnO2 and optionally CeO2; the coating liquid also preferably comprises glass fiber and polyethylene glycol; 3) calcining the precursor at 100-150 DEG C to obtain a supported ozone catalyst with a coating layer formed on the carrier.

The present invention relates to the technical field of porous ceramic preparation, and particularly to a preparation method of in-situ synthesized mullite whisker self-reinforced cordierite porous ceramics. In the present invention, a mixture of a magnesium source, an aluminum source, and a silicon source is subjected to primary ball milling and mixing. After the mixing is completed, a pore-forming agent is added for secondary ball milling and mixing to obtain a mixed material; the mixed material is pressed into a shape to obtain a green body; the green body is dried and then subjected to segmented sintering to obtain in-situ synthesized mullite whisker self-reinforced cordierite porous ceramics. The present invention uses a method combining two-stage ball milling and mixing with segmented sintering to in-situ synthesize mullite whiskers. By adjusting the sintering process, the number, size, and distribution of the whiskers are controlled within a suitable range, thereby obtaining mullite whisker self-reinforced cordierite porous ceramics with high porosity and high strength. Moreover, the raw materials for preparation are widely sourced, the composition is easy to control, and the process is easy to operate.

The invention provides a honeycomb ceramic supported denitration catalyst, a preparation method thereof and a flue gas denitration method. The method comprises the following steps: etching a cordierite honeycomb ceramic matrix in alkali liquor to obtain a pretreated honeycomb frame carrier; the preparation method comprises the following steps: mixing a titanium source, a silicon source and organic alcohol to obtain a mixed solution, carrying out hydrothermal reaction, and carrying out first drying and first roasting to obtain Ti-Si modified TiO2 hollow microspheres; adding water into the Ti-Si modified TiO2 hollow microspheres, a vanadium source, a tungsten source, a binding agent, a dispersing agent, a pore forming agent and a buffering agent, and then performing ball milling to obtain coating type catalyst slurry; and coating the pretreated honeycomb-shaped frame carrier with the coating type catalyst slurry, and then performing aging, secondary drying and secondary roasting to obtain the honeycomb ceramic supported denitration catalyst. The denitration catalyst provided by the invention has the characteristics of large specific surface area, high denitration efficiency and wide active temperature interval, and can be suitable for higher catalytic temperature.

The application belongs to the technical field of denitration catalysts, and discloses a CO-SCR denitration catalyst, a preparation method and application thereof. The preparation method comprises the following steps: (1) placing a honeycomb cordierite in a muffle furnace for preliminary calcination to obtain a carrier; (2) immersing the carrier in a mixed solution containing an aluminum source and an alkaline nitrogen source for hydrothermal treatment, taking out the carrier after the hydrothermal treatment for washing and drying to obtain a surface modified carrier; (3) preparing a bottom coating liquid containing catalyst powder and a first pore-forming agent; preparing a surface coating liquid containing catalyst powder and a second pore-forming agent; wherein the average particle size of the first pore-forming agent is greater than that of the second pore-forming agent; (4) immersing the surface modified carrier in the bottom coating liquid for coating, after preliminary drying, immersing the surface modified carrier in the surface coating liquid for coating, and after drying treatment, obtaining a catalyst precursor; (5) performing calcination treatment on the catalyst precursor to obtain a CO-SCR denitration catalyst.

To provide a methane production reactor enabling methane production with reduced energy consumption and superior methane conversion efficiency.SOLUTION: A methane production reactor according to an embodiment of the present invention comprises a honeycomb substrate and a catalyst layer. The honeycomb substrate includes partition walls defining a plurality of cells. The cells contain gas flow paths. The catalyst layer includes a methanation reaction catalyst for methanating by reacting carbon dioxide with hydrogen. The catalyst layer is provided on the surface of the partition walls so as to face the gas flow paths. The methanation reaction catalyst contains Ni as an active component and a cerium oxide support carrying the Ni. The honeycomb substrate contains cordierite. The cell density in the honeycomb substrate is 300 cpsi or more.SELECTED DRAWING: Figure 1

The application discloses a precious metal embedded porous carbon coated honeycomb ceramic monolithic catalyst and application thereof. The liquid phenolic resin polymer containing chloroplatinic acid is uniformly coated on the surface of the cordierite honeycomb ceramic through impregnation treatment; in an oxygen-nitrogen mixed atmosphere, one-stage solidification makes the liquid phenolic resin polymer containing chloroplatinic acid coated on the surface of the cordierite honeycomb ceramic completely solidified; two-stage calcination makes oxygen react with chloroplatinic acid, so that the chloroplatinic acid is decomposed, and the negative influence of chloride ions on the catalyst is eliminated; in an inert gas argon atmosphere, carbonization makes the phenolic resin polymer carbonize under high-temperature conditions to form porous carbon, and meanwhile, platinum ions are reduced to platinum single elements and embedded by the porous carbon, so that the precious metal (platinum, iridium) embedded porous carbon coated honeycomb ceramic monolithic catalyst is finally prepared.

The application discloses a preparation method of a monolithic honeycomb cordierite carrier, and comprises the following steps: (1) a honeycomb cordierite base A is immersed into alumina sol containing a physical pore expander to perform first coating, then drying, and baking under an inert atmosphere to obtain a first-coated base B; (2) the base B is immersed into an aqueous propylene oxide solution, and then the reaction is performed in a sealed reaction kettle, and then drying treatment is performed to obtain a base C; and (3) the base C is immersed into alumina sol to perform second coating, then drying is performed, and baking treatment is performed in an oxygen-containing atmosphere to obtain the monolithic honeycomb cordierite carrier. The carrier coating has a stepped pore distribution, the coating firmness is high, the preparation process is simple, and the monolithic honeycomb cordierite carrier is beneficial to practical industrial application.