233 results about "Cordierite" patented technology

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 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 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 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.

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 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 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.

The application provides a monolithic catalyst for propane combustion, which comprises a square cordierite honeycomb ceramic carrier and a double-layer coating coated on the carrier, the square cordierite honeycomb ceramic has controllable pore size; the coating comprises active components Pt and Pd, the active components are loaded on modified composite alumina, the modified composite alumina has a composition of MO x -Al2O3; the mass ratio of the noble metals Pt and Pd is 1:(0.2-2); the weight proportion of the noble metals in the coating material is 1-5%. Through detection, the catalyst obtained by the technical scheme has a significantly improved purification efficiency for propane, and the purification efficiency after 8000h can reach or exceed 96%, and the catalyst has a high propane purification efficiency; after the catalyst is hydrothermally aged for 100h at 850 DEG C with 10% H2O, the purification efficiency for propane at 550 DEG C can still reach or exceed 97%, and the catalyst shows good high-temperature hydrothermal stability.

A method for producing a porous ceramic structure, comprising the following: a) Making kneaded clay by kneading a raw material; b) Obtaining a pressed body by shaping the kneaded clay and c) Firing of the pressed body, wherein the raw material contains the following: Cordierite; Cer and iron and / or manganese and / or cobalt, wherein the process c) forms a porous ceramic structure comprising a porous structural body formed essentially of cordierite, cerium-containing particles firmly attached to the structural body, and metal oxide particles each firmly attached to an inside of a pore in the structural body, wherein the metal oxide particles are particles of an oxide having a spinel structure containing iron and / or manganese and / or cobalt, The process c) includes the following: c1) Raising the temperature of the pressed body to a first temperature that is less than or equal to a liquid phase formation temperature; c2) Increasing the temperature of the pressed body from the first temperature to a second temperature that is higher than the liquid phase formation temperature and lower than a crystallization temperature of the metal oxide particles; c3) Increasing the temperature of the pressed body from the second temperature to a third temperature which is greater than the crystallization temperature and less than or equal to a maximum temperature; and c4) Maintaining the temperature of the press body at the maximum temperature for a specified period of time, and wherein a rate of temperature increase in process c2) in the range of 100 °C / h to 200 °C / h.

The present application relates to the technical field of paint, and discloses a preparation method of a spherical alumina-cordierite composite refractory paint composition, wherein 100 parts by weight of epoxy resin, 1-5 parts by weight of an amino-terminated polymer ultraviolet absorber, 15-28 parts by weight of a filler spherical alumina trihydrate and cordierite, 29-32 parts by weight of a curing agent and the like are stirred and uniformly mixed to obtain the spherical alumina-cordierite composite refractory paint composition.The polymer ultraviolet absorber contains an ortho-hydroxybenzotriazole group, which can improve the ultraviolet absorption characteristics and ultraviolet aging resistance of the paint.The polymer, as an absorber, contains a biphenyl structure with thermal stability, which is beneficial to improving the thermal decomposition temperature, heat resistance and water resistance after being co-cured with the epoxy resin.The addition of the spherical alumina trihydrate and cordierite improves the limiting oxygen index of the paint coating and improves the flame-retardant fire resistance.

The application provides a layered structure catalyst and a preparation method and application thereof in lean natural gas tail gas purification, and relates to the technical field of catalysts.The layered structure catalyst provided by the application comprises a cordierite porous base body, a first coating layer loaded on the inner wall surface of the pore channel of the cordierite porous base body, and a second coating layer loaded on the surface of the first coating layer.In the application, the first coating layer (bottom layer) uses Pt, Pd, cerium-zirconium and zirconium-silicon-aluminum materials, most of the noble metals are arranged in the bottom layer, and the zirconium-silicon-aluminum material can further improve the sulfur and water poisoning resistance of the bottom layer material.The second coating layer (upper layer) uses a solid solution material formed by Pt, Pd and cerium-zirconium II, Pt and Pd enter the cerium-zirconium phase, the oxygen storage performance of the cerium-zirconium material can be improved, and the sulfur and water can be prevented from directly contacting the noble metals.The catalyst provided by the application has excellent sulfur and water poisoning resistance, and meanwhile, the balance between the light-off performance and the aging resistance is achieved.

The invention discloses a neutral ramming material for an intermediate frequency furnace, and belongs to the technical field of steel smelting. Comprising the following raw materials in parts by weight: 35-40 parts of microporous sintered corundum particles with the particle size of 3-5mm, 35-40 parts of microporous sintered corundum particles with the particle size of 1-3mm, 20-25 parts of magnesium aluminate spinel particles with the particle size of 1-3mm, 9-11 parts of activated aluminum oxide micro powder, 5-7 parts of modified cordierite fine powder, 1-2 parts of pretreated boron nitride, 0.5-1.5 parts of nano aluminum oxide and 0.2 part of nano aluminum oxide. 0.4 part by weight of zinc borosilicate glass powder, 0.6-0.8 part by weight of high-temperature organic silicon resin and 0.05-0.1 part by weight of anti-burst fiber. The prepared neutral ramming material for the intermediate frequency furnace has good compression strength, thermal shock resistance and slag resistance.

The invention discloses a high-performance low-expansion heat-resistant purple sand tea set with a far infrared radiation function, and belongs to the technical field of ceramic tea sets, the tea set adopts an inner-outer double-layer composite structure, the inner layer is a low-expansion enhancement layer, and raw materials comprise 58-73% of purple sand raw ore, 2-3% of rare earth, 10-20% of surface hydroxylation cordierite micro powder, 5-15% of mullite particles and 2-5% of a sintering aid; the outer layer is a far infrared radiation functional layer and comprises the following raw materials: 30-40% of far infrared radiation powder, 30-40% of purple sand fine powder and 10-15% of a high-temperature binder; a quartz sand transition layer is arranged between the inner and outer layers. According to the high-performance low-expansion heat-resistant purple sand tea set with the far infrared radiation function, through the inner layer hydroxylation cordierite micro powder modification technology, the interface bonding strength of cordierite and a purple sand matrix is improved, and the framework supporting effect of mullite particles is matched, so that the thermal expansion coefficient of the inner layer is reduced, and the thermal shock resistance is improved; the problem of temperature difference cracking is solved.

The invention discloses an ultralow dielectric constant LTCC (Low Temperature Co-Fired Ceramic) material and a preparation method thereof, the ultralow dielectric constant LTCC material is formed by compounding a glass phase and a ceramic filler phase, the glass phase comprises Li2O, La2O3, SiO2, ZrO2, P2O5, MgF2 and Al2O3; the ceramic filler phase comprises BaB2O4 and a conditioning agent, and the conditioning agent is at least one of Al2O3, SiO2 or cordierite; according to the invention, the Li-La-Si system glass and the BaB2O4 filler are compounded according to a specific proportion, so that co-firing with a silver / copper electrode at a low temperature is realized, and the composite material has excellent thermal stability and environmental friendliness, and meets the requirements of high-frequency communication applications such as 5G millimeter waves and the like on high-performance substrate materials.

The invention discloses an ultrathin flexible ceramic plate as well as a preparation method and application thereof. The ultrathin flexible ceramic plate is prepared from the following raw materials: cordierite powder, PAN (Polyacrylonitrile) fiber, polysiloxane, nano Al2O3, aluminum dihydrogen phosphate sol and a fluorocarbon resin composite coating. The preparation method comprises the following steps: 1) pretreatment; 2) freezing and casting; 3) heat treatment and carbonization; 4) fluorocarbon coating process and hot isostatic pressing; the preparation method comprises the following steps: firstly, carrying out freeze casting to obtain a ceramic plate matrix, and carrying out hot pressed sintering on the ceramic plate matrix to carbonize PAN fibers into carbon fibers to obtain high-strength single-layer ceramic sheets and composite ceramic sheets, so as to obtain the flexible ceramic plate. The obtained ultra-thin flexible ceramic plate is high in strength and toughness, resistant to high temperature and good in sound insulation and heat insulation effect, through precise configuration and chemical coupling of the components, the problem that a ceramic material is crisp if being strong and weak if being thin is solved, and a new scheme is provided for industrialization of flexible ceramics.

Disclosed is a catalyst composition for selective catalytic reduction of nitrogen oxides, consisting of at least one vanadium oxide in an amount of 2.0 to 4.0 wt.-%, calculated as V2O5 and based on the total weight of the catalyst composition; at least one tungsten oxide in an amount of 2.5 to 7.2 wt.-%, calculated as WO3 and based on the total weight of the catalyst composition; at least one antimony oxide in an amount of 0.6 to 3.4 wt.-%, calculated as Sb2O5 and based on the total weight of the catalyst composition; at least one zirconium oxide in an amount of 0 to 1.0 wt.-%, calculated as ZrO2 and based on the total weight of the catalyst; and at least one titanium oxide in an amount of 84.6 to 94.9 wt.-%, calculated as TiO2 and based on the total weight of the catalyst, wherein the weight ratio of the oxides of vanadium, tungsten, antimony, titanium and optionally zirconium, calculated as V2O5, WO3, Sb2O5, TiO2 and optionally ZrO2, respectively, add up to 100 wt.-%. Furthermore, disclosed is an SCR catalytic article, wherein the SCR catalyst composition according to the invention is attached in the form of a coating. Suitable catalyst carriers are corrugated substrates and cordierite monoliths. The SCR catalytic articles can be used in a method for reducing nitrogen oxides in the exhaust gas of lean-burn internal combustion engines, and they can also be included in exhaust gas purification systems for treating diesel engine exhaust gas.

The invention discloses a snow melting process based on electromagnetic induction heating of a turnout, which comprises electromagnetic induction coils attached to the waist of a turnout steel rail and the side face of a turnout sliding plate, and electronic paste containing graphene, silver, copper, nickel and ruthenium series resistance paste and a dopant prepared by compounding spinel cordierite and ferrite is burnt and injected to the outer sides of the coils. Alternating current is applied to the coil to generate a magnetic field, the inner side magnetic flux enables the steel rail to generate eddy current heating, the outer side magnetic flux enables slurry carriers to migrate to generate Joule heat, and a synergistic heating infrared radiation system is formed. The method has the beneficial effects that ice and snow on the surface of a turnout steel rail, a rail gap and a sliding plate area are synchronously melted, the technology utilizes the infrared radiation characteristics of graphene, spinel cordierite and ferrite powder, original vacant magnetic flux is utilized, the magnetic flux utilization rate is increased, power consumption is reduced, and the snow melting efficiency and reliability are improved.

The invention discloses a low-expansion cordierite-mullite composite ceramic roller and a preparation method thereof, and relates to the technical field of ceramic rollers. Aluminum nitrate, magnesium nitrate and a silicon dioxide solution are used as raw materials, glycine is used as fuel, cordierite-mullite precursor micro-powder is prepared through a solution combustion synthesis method, then the cordierite-mullite precursor micro-powder, emery, kaolin and a binder are mixed to prepare a ceramic roller rod mixture, and the ceramic roller rod mixture is sintered to obtain the ceramic roller rod. Prefabricating the mixture into a green body through a forming process; and drying and sintering the green body in sequence to finally prepare the low-expansion cordierite-mullite composite ceramic roller which is low in thermal expansion coefficient, good in thermal conductivity, high in strength and strong in bending resistance. According to the preparation method, the firing temperature of the cordierite-mullite composite ceramic roller can be reduced, it is ensured that cordierite cannot be decomposed in the process of preparing the cordierite-mullite composite ceramic roller, and meanwhile it is ensured that a long-column-shaped mullite phase which is good in crystal grain development and distributed in a net-shaped and crossed mode is generated.

The invention provides a diesel power piston surface ceramic coating material, a thermal barrier coating and a preparation method thereof, and relates to the field of ceramic coatings. The ceramic coating material is uniformly mixed plasma spraying composite powder and comprises 8YSZ powder, cordierite powder and silicon oxide powder, and the hollow rate of the 8YSZ powder is 30-45%; the particle size of the cordierite powder is not greater than 30 [mu] m, the content of the cordierite powder is 20-30 wt.%, the content of the silicon oxide powder is 5-8 wt.%, and the balance is the 8YSZ powder. According to the ceramic coating obtained by spraying the ceramic coating material through an atmospheric plasma spraying process, cordierite with a porous and multiphase structure and relatively low density and volume heat capacity is uniformly doped in the ceramic coating, and pores are distributed at intervals, so that the whole ceramic coating has low volume heat capacity and low heat conductivity; and the ceramic coating is also relatively high in bonding strength and relatively low in density, so that the thermal efficiency of diesel power can be improved, and the oil consumption of an engine is reduced.