633 results about "Ceramic composite" patented technology

The invention discloses a production process of high-strength anti-distortion cold-rolled strip steel. The production process comprises the links of raw material preparation, cold rolling, heat treatment, surface treatment and quality detection. Selecting medium-carbon steel with specific components as raw materials, and controlling the tolerance of hot-rolled strip steel; a six-roller unit is adopted for multi-pass rolling in cold rolling, and a plate shape control technology is matched; continuous annealing and gradient quenching-isothermal tempering are applied to heat treatment, so that a specific structure gradient is formed, and the distortion rate is reduced; the surface is subjected to acid pickling, hot galvanizing and a nano ceramic composite coating, so that the corrosion resistance and the wear resistance are improved; and the quality is guaranteed through online detection and sampling inspection. The strip steel produced through the technology is high in strength, good in toughness, high in corrosion resistance and suitable for the high-requirement field.

The invention provides a preparation method of a metal-based ceramic composite membrane with a catalytic ozone function. The preparation method comprises the following steps: preparing functional powder by taking tetrabutyl titanate as a titanium source and silver nitrate or ferric nitrate as a catalytic active metal source and adopting a sol-gel method; a porous metal pipe is used as a supporting body, metal powder and functional powder which are made of the same material as the supporting body are mixed to prepare functional slurry, the functional slurry is evenly deposited on the inner wall of the supporting body through vacuum filtration, and powder particles which are not firmly combined are removed through back flushing; and finally, the binding force between the functional film layer and the metal matrix is improved through high-temperature heat treatment. Wherein the thermal expansion coefficient difference between the metal supporting body and the functional film layer can be reduced by adding the metal powder, the metal powder is melted and diffused in the high-temperature heat treatment stage, and metallurgical bonding is formed between the functional powder and the metal substrate. The method is simple in process, and the prepared metal-based ceramic composite membrane has the advantages of being high in membrane layer binding force, not prone to falling off, high in catalytic activity, high in anti-pollution capacity, stable in operation and the like.

The invention discloses a preparation method of a high-density carbon-carbon composite material, which comprises the following steps: soaking a needled prefabricated body in a resin mixed solution, vacuumizing and dipping, drying in a drying oven, then putting into a mold, carrying out hot-pressing curing molding, and carbonizing to obtain the high-density carbon-carbon composite material. According to the preparation method, the carbon-carbon composite material with the density larger than 1.2 g / cm < 3 > can be obtained through one-time dipping and one-time hot pressing, the production period is short, energy consumption is low, the production cost is remarkably reduced, and the carbon-ceramic composite material with the density larger than 1.2 g / cm < 3 > can be obtained through one-time dipping and one-time hot pressing. And the prepared carbon-carbon composite material can achieve a high-density effect when the density is low, and has the characteristics of good air tightness, difficulty in deformation at high temperature and the like.

The invention provides a PCBN composite material and a preparation method thereof.The preparation method comprises the steps that two or more of zirconium oxide, titanium nitride, silicon nitride, titanium diboride, silicon carbide, titanium carbide, titanium carbonitride, aluminum oxide and aluminum nitride are mixed, and ceramic composite powder is prepared; the CBN micro powder and a metal binding agent are subjected to ball milling and mixing, and CBN pre-composite micro powder is prepared; mixing the CBN pre-composite micro powder with the ceramic composite powder to obtain a premix, placing the premix in a mold for pre-pressing to obtain a blank piece, and then assembling the blank piece for sintering to obtain a PCBN composite material; the mass percentage content of the ceramic composite powder is 5%-40%, the mass percentage content of the metal binding agent is 15%-30%, and the mass percentage content of the CBN micro powder is 45%-65%. According to the method, the toughness and the stability of the PCBN cutter can be improved on the premise of low content of CBN (Cubic Boron Nitride).

The invention relates to the technical field of battery materials, in particular to a para-aramid lithium battery diaphragm and a preparation method thereof. The para-aramid lithium battery diaphragm comprises para-aramid slurry and a base membrane, the para-aramid slurry is coated on the two sides of the base membrane to form para-aramid coatings, and the para-aramid slurry comprises the following raw materials in parts by weight: 20-40 parts of modified para-aramid polymer liquid, 10-20 parts of nano ceramic composite material powder and 10-18 parts of a solvent; the nano ceramic composite material powder is prepared from the following raw materials in parts by weight: 50 to 100 parts of nano aluminum oxide, 8 to 12 parts of nano zirconium dioxide, 0.3 to 0.8 part of yttrium oxide, 1 to 5 parts of magnesium nitrate hexahydrate, 0.1 to 1 part of polyacrylic acid, 1 to 2 parts of ammonia water, 1 to 3 parts of coupling agent and 20 to 30 parts of silicon dioxide; the nano ceramic composite material powder is added into the para-aramid slurry, so that the para-aramid diaphragm has better thermal stability, and the phenomenon of thermal shrinkage of the diaphragm at high temperature is reduced.

The invention belongs to the field of carbon-based composite materials, and particularly relates to a short carbon fiber reinforced carbon-ceramic composite material. The preparation method comprises the following steps: mixing mesophase pitch powder and resin powder according to a mass ratio of (5-7): (3-5) to obtain a mixed binder; uniformly mixing nanoscale carbon black serving as a reinforcing phase and sodium dodecyl sulfate serving as a dispersing agent to obtain modified nano carbon black; uniformly mixing the obtained mixed binder with modified carbon black according to the ratio of 100: (1-4) to obtain a mixed binder; weighing the modified carbon black enhanced mixed binder and short carbon fibers according to a mass ratio of (40-60): (40-60), and uniformly mixing to obtain pressed powder; and carrying out hot press molding, carbonization and reactive infiltration to obtain the short carbon fiber reinforced carbon-ceramic composite material. The process is simple and controllable, the obtained product is high in density, high in strength and high in friction coefficient stability, and industrial application is facilitated.

The invention discloses metal ceramic MAX-phase composite powder for spraying and a preparation method of the metal ceramic MAX-phase composite powder, and belongs to the field of metal ceramic composite materials. The method comprises the following steps: mixing Ni powder, Cr powder and Cr2AlC nano powder with deionized water, a binder and a dispersant according to a specific ratio, and carrying out wet ball milling to prepare uniform slurry; carrying out spray granulation to obtain primary spherical powder; and finally, carrying out spheroidizing treatment on the primary powder by adopting radio frequency plasma under the protection of inert gas to obtain a final product. The core of the preparation method is that through an optimized two-step process, many limitations in the application aspect of an existing MAX phase material are solved, and the composite powder which is high in sphericity degree, good in flowability, compact in interior and stable in MAX phase component is successfully prepared. The powder can be directly used for thermal spraying, and an ideal raw material is provided for preparing a high-performance MAX-phase metal ceramic coating.

The invention discloses a self-healing high-temperature anti-oxidation carbon-ceramic composite material, belongs to the technical field of ceramic-based composite materials, and particularly relates to a method for introducing a self-healing metal-element-free high-temperature anti-oxidation ceramic matrix into a carbon fiber preform. Then introducing a resin carbon matrix and a self-healing inorganic filler through two times of vacuum impregnation and high-temperature cracking, and finally preparing the SiC matrix by adopting high-temperature siliconizing. The carbon-ceramic composite material prepared by the invention does not contain metal impurities, has a self-healing function, and has a long-life anti-oxidation function in a range of 700-1000 DEG C.

The invention discloses an ultraviolet-resistant and high-temperature-aging-resistant photovoltaic cable structure which comprises a cable conductor, and a buffer layer, an insulating layer, a shielding layer and a sheath layer which are sequentially arranged on the outer side of the cable conductor. The insulating layer is formed by co-extruding a heat-conducting buffer layer, a main insulating layer and a reflection isolating layer, and the heat-conducting buffer layer is provided with a heat-conducting channel along the axial direction; the shielding layer comprises a main body shielding layer and a thermal insulation layer. Silver-plated copper wires are embedded in the thermal insulation layer. Lotus-leaf-like bionic protrusions are arranged on the outer surface of the sheath layer, and a shape memory polymer film is embedded in the sheath layer. The cable conductor is made of high-purity oxygen-free copper and is spirally twisted, a ceramic composite coating is coated outside the cable conductor, and the buffer layer is a polytetrafluoroethylene film. According to the structure, through cooperation of multi-layer composite design and functional materials, the effects of rapid heat dissipation, improvement of temperature resistance and aging resistance, effective blocking of ultraviolet rays, enhancement of structural stability and the like are achieved, the problems that an existing photovoltaic cable is poor in weather resistance, insufficient in heat conduction and prone to structure failure are solved, and the photovoltaic cable can be widely applied to outdoor scenes such as photovoltaic power stations and the like.

The invention relates to the technical field of ceramic composite material preparation, in particular to diamond / silicon carbide double-phase homogeneous suspension slurry and a preparation method thereof. Comprising the following steps: setting the total integral number of diamond and silicon carbide in slurry as well as the volume ratio of diamond to silicon carbide according to requirements; preparing a water-based suspension according to a set total integral number and volume ratio; measuring Zeta potentials of the suspension under different pH values, and recording the pH value corresponding to the maximum absolute value of the Zeta potential as an optimal pH value A; selecting a dispersing agent according to the optimal pH value A; adding a dispersing agent into the suspension, and determining the optimal addition amount of the dispersing agent by taking approaching the optimal pH value A as a standard; diamond particles, silicon carbide particles, deionized water and a dispersing agent are mixed in proportion, and diamond / silicon carbide double-phase homogeneous suspension slurry is obtained through dispersing treatment. The preparation method has the advantages that the double-phase proportion and distribution can be accurately regulated and controlled, and the slurry is low in viscosity, good in stability and suitable for various forming processes.

The invention discloses a low-dielectric low-loss high-strength borosilicate glass ceramic composite material and a preparation method thereof, and belongs to the technical field of borosilicate glass ceramic composites.The low-dielectric low-loss high-strength borosilicate glass ceramic composite material is prepared from, by weight, 70% of low-alkali borosilicate glass ceramics with the low borosilicate ratio, 29% of Al2O3 and 1% of Bi2O3. The preparation method comprises the following steps: preparing low-alkali borosilicate glass ceramics with a high borosilicate ratio, melting the low-alkali borosilicate glass ceramics with the high borosilicate ratio and amorphous SiO2 at a set temperature to obtain the required low-alkali borosilicate glass ceramics with the low borosilicate ratio, and finally mixing and ball-milling the crushed and ground low-alkali borosilicate glass ceramics with Al2O3 and Bi2O3 to obtain the low-alkali borosilicate glass ceramics with the low borosilicate ratio. And finally, the borosilicate glass ceramic composite material is sintered at the temperature of 880-900 DEG C. The borosilicate microcrystalline glass ceramic composite material is low in dielectric, low in loss and high in strength.

The invention belongs to the technical field of ceramic composite substrate processing, and discloses a high-strength and high-thermal-conductivity aluminum nitride ceramic composite substrate preparation device which comprises a preparation assembly, driving assemblies are arranged on the front side and the rear side of an inner cavity of the preparation assembly correspondingly, a discharging table is arranged on the inner sides of the driving assemblies, and a clamping structure is hinged to the outer side of the discharging table; a feeding mechanism and a discharging mechanism which are located below the discharging table are arranged on the two sides of the preparation assembly correspondingly. Through the arrangement of the connecting rod and the corrugated block, when the driving assembly operates, the whole discharging table is driven to move upwards through the transmission chain, the connecting rod is driven to move to the outer side of the corrugated block, then the corrugated block extrudes the connecting rod and drives the connecting rod to move in a reciprocating mode, and meanwhile the connecting rod drives the movable block to move; and the whole supporting frame is driven to rotate, so that the green body rotates on the inner side of the heating plate, the green body is uniformly sintered, and flaws are avoided.

The invention belongs to the technical field of electronic information components, and discloses a ceramic composite protective layer capable of improving working temperature, and a preparation method and application thereof. Firstly, a silicon nitride film is deposited on the surface of a sensitive layer of a film temperature sensor by adopting a magnetron sputtering technology; and depositing an aluminum oxide protection layer on the surface of the silicon nitride film by adopting an ultrasonic spraying technology to form a protection layer with a silicon nitride / aluminum oxide composite structure. The internal stress of the composite structure protection layer can be reduced, the thermal stability of the composite structure protection layer is improved, meanwhile, the problem of overflow of sensitive layer material elements in the sensor is inhibited, and the high-temperature stability of the film temperature sensor is improved. According to the invention, the working temperature range of the thin film temperature sensor in an ultra-high temperature environment is obviously expanded, so that the thin film temperature sensor can better adapt to a severe environment at a hot port of an aero-engine with a large thrust-weight ratio.

The application discloses a kind of high-temperature-resistant impact-resistant heat-absorbing heat-insulating composite ceramic brick and its preparation method and application, the ceramic composite brick includes heat-insulating layer and heat-absorbing layer;The main component of the heat-insulating layer is vacuum nanometer heat-insulating ceramic particles and alloy metal particles containing one or more of tungsten, cobalt, molybdenum or vanadium elements;The main component of the heat-absorbing layer is 3N grade and above high-purity alumina and black pigment;The components of the heat-insulating layer and the heat-absorbing layer are filled in the same mold in sections, and then are pressed to form a composite.The heat-insulating layer not only has excellent heat-insulating performance, but also has good toughness and impact resistance;The heat-absorbing layer can quickly absorb heat and accumulate heat, the temperature rising speed in the furnace is increased by more than 30%, the set temperature is quickly reached, the heat-insulating performance is increased by more than 2 times, and has good practical value and important energy-saving and environmental protection social value.

The invention discloses a gradient composite reinforced anti-corrosion treatment method for a metal alloy guardrail, and belongs to the technical field of metal material surface treatment. The method comprises the following steps: carrying out ultrasonic cavitation micro-etching and electrochemical gradient activation pretreatment on the surface of a substrate; a metal ceramic composite layer containing a non-oxide ceramic reinforced phase is generated on the surface in situ through a micro-arc oxidation-chemical vapor deposition coupling process, and a component transition layer is formed with the assistance of vacuum gradient diffusion alloying treatment; and finally, coating an intelligent resin coating containing a corrosion inhibitor capsule and a corrosion indicator, and constructing a super-hydrophobic surface. By constructing a multi-layer composite protection system of the gradient diffusion layer / the metal ceramic layer / the intelligent coating / the super-hydrophobic layer, the anti-corrosion performance is remarkably improved, and the obtained guardrail has excellent bonding strength, wear resistance and long-acting anti-corrosion service life, has the intelligent functions of damage self-repairing and corrosion state visualization and is suitable for popularization and application. The method is especially suitable for harsh service environments.

The invention provides an ultrahigh-temperature ceramic composite material with tensile plasticity and a preparation method thereof, and relates to the field of ceramic composite materials. The preparation method of the ultrahigh-temperature ceramic composite material with tensile plasticity comprises the following steps: extrusion molding, curing treatment and hot pressed sintering. The extrusion molding method comprises the step of simultaneously carrying out extrusion molding on the first ceramic slurry, the second ceramic slurry and the third ceramic slurry to obtain the fiber-reinforced ultra-high-temperature ceramic green body with the sandwich structure. According to the preparation method of the ultra-high-temperature ceramic composite material with tensile plasticity, the problems that existing ultra-high-temperature ceramic is prone to brittle fracture under the tensile load and poor in fracture toughness, tensile strength and tensile plasticity can be solved, and the brittle fracture tendency of the ultra-high-temperature ceramic under the tensile load effect in the ultra-high-temperature environment is improved.

This invention belongs to the field of ceramic composite material manufacturing technology, specifically relating to a method for preparing SiC composite materials based on cold spraying and silicon infiltration. SiC powder is prepared into a suspension, which is then deposited onto a substrate using a cold gas-powered spraying system to form a porous SiC preform coating. The preform coating undergoes post-curing to enhance its cohesive strength. Finally, melt silicon infiltration is performed, causing silicon to react with carbon in the preform to generate a new SiC phase that fills the pores, resulting in a high-density, high-performance SiC composite component. This method combines the advantages of low-temperature forming in cold spraying with silicon infiltration technology. The relatively low substrate temperature during cold spraying effectively avoids the adverse effects of high temperatures on the material structure, maintaining the stability of the original SiC phase. By adjusting the spraying parameters and matching the silicon infiltration process, the free silicon content and the distribution of the newly generated SiC phase in the composite material can be precisely controlled, further improving the material's density and mechanical properties.

The utility model discloses a multi-magnet square coil closed-loop motor, and relates to the technical field of closed-loop motors, and the motor comprises a fixed end cover, the rear end of the fixed end cover is provided with a motor main body, the outer side of the fixed end cover is provided with a fixed plate, the outer side of the motor main body is provided with a stable protection assembly, and the surface of the motor main body is provided with a heat dissipation plate. The stable protection assembly comprises a protection shell movably connected to the outer side of the motor body, and a stable pad is arranged on the inner side of the protection shell. The whole motor body is installed in the protective shell and protected through the protective shell, meanwhile, the motor is prevented from being affected by an external magnetic field in the use process through the insulation performance and the magnetic isolation performance of the ceramic composite material, the stability of the motor in the use process is ensured, the motor body is extruded to a certain degree through the stabilizing pad, and the stability of the motor is improved. The motor main body is prevented from shaking in the protective shell, and the noise reduction effect is improved while the stability is improved.

The utility model relates to the technical field of ceramic composite boards, in particular to a wear-resistant ceramic composite board which comprises a protective surrounding edge, a mounting structure is arranged on the inner side of the protective surrounding edge, wear-resistant assemblies are arranged in the mounting structure, and anti-seismic mechanisms and protective assemblies are arranged on the inner sides of the wear-resistant assemblies on the upper side and the lower side. The protection assembly is located on the inner side of the anti-seismic mechanism. According to the utility model, the protection assembly is arranged, when the protection assembly is used, the protection assembly is composed of a resin layer, a metal fiber layer, a waterproof layer, a heat preservation layer, a sound insulation plate and a shaping honeycomb plate, and the metal fiber layer is arranged in a crossed manner, so that the strength and the toughness of the assembly are enhanced, and excellent impact resistance and wear resistance are ensured in the use process; the arrangement of the waterproof layer and the heat preservation layer not only improves the waterproof and heat preservation performance of the assembly, but also effectively prevents the damage caused by damp and temperature change of the internal structure, thereby prolonging the service life, and the application of the sound insulation plate effectively weakens the external noise.

The present application relates to a kind of high electrochemical performance porous ceramic matrix composite and its preparation method, porous ceramic matrix composite includes: porous ceramic composite, carbon coating layer is coated in the outer surface of porous ceramic composite;Porous ceramic composite: porous ceramic matrix, dispersing carbon layer is dispersedly distributed on the outer surface and pore wall of porous ceramic matrix, and silicon nanolayer is deposited on dispersing carbon layer;Silicon nanolayer is made of closely arranged nanometer silicon crystal grain;The average particle size of nanometer silicon crystal grain is between 1nm and 5nm;Silicon element in porous ceramic matrix composite accounts for 20wt% to 70wt%;The thickness of dispersing carbon layer is between 1nm and 20nm;The porous ceramic matrix composite of the present application is used to prepare negative pole piece and is applied in lithium ion battery, can improve the first cycle coulomb efficiency and safety performance of lithium ion battery.

The application belongs to the technical field of carbon / ceramic composite material preparation, and provides an impregnation sealing liquid for carbon / ceramic friction discs, an impregnation sealing method, a densified carbon / ceramic friction disc and application thereof. The impregnation sealing liquid comprises 2-5% of an interface reinforcing metal component, 3-6% of a friction and wear resistant ceramic component, 2-5% of a metal oxide component and the balance of a polymer. The polymer comprises liquid polycarbosilane and liquid polyborosilazane, and the mass ratio of the liquid polycarbosilane to the liquid polyborosilazane is 7-9:1-3. The interface reinforcing metal component comprises one or more of titanium powder, chromium powder, nickel powder, cobalt powder and molybdenum powder. The friction and wear resistant ceramic component comprises one or more of silicon carbide, zirconium boride, boron carbide and zirconium carbide. The metal oxide component comprises one or more of cerium oxide, yttrium oxide and lanthanum oxide. The impregnation sealing liquid can realize the triple improvement of the interface bonding force, the friction stability and the high-temperature oxidation resistance of the carbon / ceramic friction disc.

The invention provides a low-smoke halogen-free high-flame-retardant power cable and a preparation method thereof, and the low-smoke halogen-free high-flame-retardant power cable comprises a conductor, an insulating layer and a sheath layer. The sheath layer is prepared from the following raw materials: 25 to 40 parts of ethylene-vinyl acetate copolymer, 15 to 25 parts of linear low-density polyethylene, 5 to 15 parts of metallocene polyethylene, 8 to 15 parts of reactive phosphorus-nitrogen-silicon hybrid compatibilizer, 12 to 22 parts of low-temperature sintered ceramic composite powder, 30 to 45 parts of surface-treated magnesium hydroxide, 15 to 25 parts of surface-treated aluminum hydroxide, 3 to 6 parts of organic modified montmorillonite and 1.5 to 2.5 parts of triallyl isocyanurate. 1.0 to 2.0 parts of a composite antioxidant, 1.0 to 2.5 parts of a calcium-zinc stabilizer and 0.5 to 1.5 parts of silicone master batch. The prepared low-smoke halogen-free high-flame-retardant power cable has excellent flexibility, mechanical property, heat resistance and processability, is stable in flame retardant property and stable in size, and is suitable for safety protection of power cables.

The invention discloses a novel nano-coating cast steel brick and a preparation method thereof. The cast steel brick comprises a cylindrical refractory matrix, a double-layer nano coating and a modified metal reinforcing belt, wherein the double-layer nano coating comprises a nano aluminum oxide bottom layer and a functional layer containing a sol-gel pre-coated graphene-ceramic composite material. According to the preparation method, pulse vibration forming, a sol-gel pre-coating technology and a carbon thermal reduction protective atmosphere sintering technology are adopted, the graphene-ceramic composite material has an Al2O3-BN double-layer ceramic coating layer protection structure, and the structural stability of graphene at the high temperature is ensured. The technical problems of low refractoriness, poor corrosion resistance and short service life of a traditional cast steel brick are solved, the refractoriness is improved by about 6%, the corrosion resistance is improved by 78%, the thermal shock stability is improved by about 79%, the single use performance is improved by 250%, and the cast steel brick is suitable for molten steel flow control in a continuous steel casting process.

The application discloses a preparation method of an anode layer / electrolyte layer heterostructure based on superfast high-temperature sintering, and comprises the following steps: placing a double-layer element blank of an anode layer / electrolyte layer on a graphite felt heating element under a vacuum atmosphere, and directly contacting the electrolyte layer of the double-layer element blank with the graphite felt heating element; wherein the anode layer is a NiO-ceramic composite anode layer; and making an electric current pass through the graphite felt heating element to cause the Joule heat of the graphite felt heating element, and then performing superfast high-temperature sintering on the double-layer element blank through heat radiation and / or heat conduction. The application can avoid the delamination, warping and micro-cracks that are prone to occur in the traditional high-temperature co-sintering forming method; the temperature gradient can be controlled through electric parameters, and the NiO in the anode layer can be reduced to metal Ni at low temperature in the sintering process, and the application has the advantages of simple process, high efficiency and low cost, and provides a new way for the large-scale preparation of solid oxide fuel cells, solid oxide electrolysis cells, high-temperature electrochemical sensors or other multilayer heterostructures.

The application relates to a preparation method of a metal-based ceramic composite material and the metal-based ceramic composite material, and steps are as follows: 1. ceramic particle screening and pretreatment: screening and polishing are sequentially performed on the ceramic particles, and the Al2O3 and B4C powder mixture is uniformly sprayed on the surface of the polished ceramic particles in a thermal spraying mode; 2. ceramic preform preparation: after the pretreated ceramic particles, a bonding agent and a mixed powder are uniformly mixed, the mixture is filled into a mold, one-time solidification treatment is performed, a preliminarily formed ceramic preform is obtained, secondary solidification treatment is further performed, and the ceramic preform is obtained; 3. metal-based ceramic composite material pouring forming: the ceramic preform is placed in a casting cavity, metal liquid pouring is performed, and after cooling, the composite material is taken out; 4. heat treatment: the composite material is sequentially subjected to multi-stage normalizing heat treatment and tempering heat treatment, and the metal-based ceramic composite material is obtained. The application solves the problems of ceramic particle peeling and composite layer cracking of the existing composite material.

The invention belongs to the technical field of refractory materials. The invention provides a graphene ceramic composite material and a preparation method and application thereof, the preparation method comprises the following steps: adding zirconium boride particles, silicon carbide particles, yttrium oxide and lanthanum-doped cerium oxide into a graphene oxide dispersion liquid, and carrying out ball milling and drying to obtain raw material powder; the raw material powder is put into a graphite mold to be sintered, and the graphene ceramic composite material is obtained. The raw material powder is prepared from the following components in parts by volume: 5.6 to 6 parts of graphene oxide, 70 to 72 parts of zirconium boride particles, 20 to 21 parts of silicon carbide particles, 1.5 to 2 parts of yttrium oxide and 1 to 1.3 parts of lanthanum-doped cerium oxide. By increasing the content of graphene oxide, the bending strength of the composite material is further improved while the relative density of the prepared composite material is increased.

The present invention relates to the field of carbon-ceramic composite materials, in particular to a non-dense carbon-ceramic friction material, and a preparation method therefor and the use thereof. The non-dense carbon-ceramic friction material is obtained by subjecting a C / C-Si green body to a silicon infiltration treatment using silicon powder. The raw materials for preparing the C / C-Si green body comprise chopped carbon fibers, graphite powder, a ferrosilicon mixture, silicon carbide powder, boron nitride powder, and phenolic resin powder. The non-dense carbon-ceramic friction material is made to have a porosity of 15-25 vol.%, a high-temperature resistance limit of 1350°C and a compressive strength of 80.5 ± 2.4  MPa; therefore, a friction plate prepared therefrom exhibits a wear amount of 52.8-95.0  μm and a friction coefficient of 0.6-0.7 in an AK master program test. Compared with friction materials in the prior art, the non-dense carbon-ceramic friction material has the advantages of a non-dense structure, a light weight, high-temperature resistance, etc.

The invention relates to the technical field of coatings, in particular to an MOFs enhanced nano ceramic coating material, a preparation method and application of the MOFs enhanced nano ceramic coating material to a heat insulation film. The preparation method comprises the following steps: firstly, coating the surface of Al2O3 / ZrO2 nano composite ceramic with ZIF-8 through an in-situ growth method to form MOFs enhanced nano ceramic composite powder with a core-shell structure; performing amino modification by using an amino silane coupling agent, and grafting polyacrylic acid by using an amidation reaction catalyzed by DCC / DMAP (dicyclohexylcarbodiimide / dimethylaminopyridine), so as to obtain surface carboxylated modified nano ceramic composite powder; and finally, mixing and dispersing the modified powder with organic silicon resin containing hydroxyl functional groups, a polyvinylpyrrolidone dispersing agent, a polyether modified polydimethylsiloxane flatting agent, a polyoxyethylene polyoxypropylene glycerol ether defoaming agent and ethanol to obtain the MOFs enhanced nano ceramic coating material. The coating has low thermal conductivity and high mechanical strength, and the powder has good dispersion stability in the coating, so that the coating can be widely applied to the field of heat-insulating films.

The utility model relates to the field of interface bonding strength testers, and discloses a carbon-ceramic composite material interface bonding strength tester which comprises a machine body and a shielding cover, a mounting frame and an impact mechanism are fixedly mounted at the top of the machine body, and an overturning cover is rotatably connected to the surface of the shielding cover. The size specification of the surface of the overturning cover is matched with the size specification of the surface of the shielding cover, a handle is fixedly installed on the surface of the overturning cover, a pull rope is fixedly connected to the inner wall of the overturning cover, a winding disc is fixedly installed at one end of the pull rope, and the bottom end of the shielding cover is connected with the top of the machine body in a clamped mode. The shielding cover is installed on the surface of the machine body, the overturning cover is installed on the top of the shielding cover, the pull rope is installed on the inner wall of the overturning cover, one end of the pull rope is connected with the surface of the winding disc in the shielding cover, so that the surface of the machine body is shielded by means of the shielding cover and the overturning cover, and the winding disc is rotated to control the pull rope so as to close the overturning cover conveniently.

The invention discloses a metal casting particle ceramic grinding ball / grinding forging for a ball mill and a manufacturing method of the metal casting particle ceramic grinding ball / grinding forging, and belongs to the technical field of grinding equipment. The grinding ball / grinding forging comprises a wear-resistant metal matrix (1) and a particle ceramic polymer (2) wrapping the wear-resistant metal matrix (1). The particle ceramic polymer (2) is formed by mixing particle ceramic, a high-temperature adhesive and iron alloy powder and reinforcing the mixture with a built-in steel wire (22). During manufacturing, the particle ceramic polymer shell with a certain thickness and pores is prepared by using an EPS foam mold, then the particle ceramic polymer shell is placed in a casting mold, high-temperature molten metal is poured into the casting mold, and the high-temperature molten metal permeates into the pores of the particle ceramic polymer shell by using a casting infiltration principle to form a firm metal-based ceramic composite structure. The high-strength, high-toughness and impact-resistant metal matrix and the high-hardness particle ceramic layer are combined, low abrasion, low ball breaking rate and high abrasion resistance are achieved at the same time, the process is simple, the cost is low, and the method is suitable for large-scale production.