317 results about "Zirconia ceramic" patented technology

The invention relates to the technical field of zirconia ceramic sintering, and discloses a zirconia ceramic microwave single-die-cavity rapid sintering system and an intelligent temperature control method.The system comprises a high-temperature-resistant metal cavity, a microwave generation unit, a temperature detection and control unit, a coil base assembly and an auxiliary structure, and centralized control is achieved through an intelligent touch control computer. A microwave single-mode resonance mode is adopted, a silicon carbide wave absorbing layer is used for enhancing microwave absorption, materials are evenly heated from inside to outside, an intelligent temperature control method is used for monitoring the temperature in real time based on a short-wave infrared thermometer, a PI D control algorithm is combined, the power of a magnetron is dynamically adjusted through an adjustable power source, the temperature control precision reaches + / -2 DEG C, and the temperature control precision reaches + / -2 DEG C; the problems of non-uniform temperature, high energy consumption, high rejection rate, long sintering time and the like in a traditional zirconia ceramic sintering process are effectively solved, the production efficiency can be greatly improved, the cost is reduced, the product quality is improved, the equipment also supports multiple process modes, and diversified production requirements are met.

The invention discloses a simulation test method for ceramic sintering stress and a method for reducing the ceramic sintering stress. The simulation test method comprises the following steps: 1, measuring the grain size, the relative density and the geometric size before and after sintering; 2, establishing a ceramic geometry by using Abaqus, and constructing a transient heat conduction model; 3, establishing a viscoelastic constitutive equation of sintering shrinkage deformation of the zirconia ceramic, and constructing a sintering shrinkage model; and 4, sequentially coupling the transient heat conduction model and the sintering shrinkage model, and implementing joint simulation of solid-phase sintering simulation to obtain a sintering stress simulation result of the ceramic. The method for reducing the ceramic sintering stress comprises the following steps: 5, establishing a ceramic sintering shrinkage finite element model with grain sizes distributed in proportion, and calculating average sintering stress distribution of the grain size proportion distribution model; and 6, comparing the average sintering stress of the sintering shrinkage models with different grain size proportions, and determining a method for reducing the sintering stress. The ceramic sintering quality and the production efficiency are improved.

The invention provides a granulation raw material, a pre-sintered body, a zirconia porcelain block, a fast firing production method and application. The fast firing production method comprises the following steps: S1, providing a first zirconium oxide material and a second zirconium oxide material; s2, compounding the first zirconium oxide material and the second zirconium oxide material, and granulating together with an auxiliary material to obtain a granulation raw material; s3, obtaining a green body based on the granulation raw materials; s4, carrying out pre-sintering treatment on the green body to obtain a pre-sintered body; and S5, machining the pre-sintered body, and then carrying out fast firing treatment to obtain the zirconium oxide porcelain block. On the basis of compounding of granulation raw materials, the overall performance of the zirconia ceramic block can be improved while a pre-sintered body can be rapidly sintered.

The invention relates to the technical field of high-temperature alloy materials, and provides an N10276 profiled bar and a forming method thereof.The surface of a blank is coated with a three-layer composite sheath, the blank is heated in a partitioned and gradient mode, the temperature of a side wing plate area is 50-100 DEG C higher than that of a web plate area, the metal fluidity of a side wing plate is improved, cogging rolling, four-roller reciprocating finish rolling, partitioned and gradient cooling and secondary solution treatment are conducted, and the N10276 profiled bar is obtained. A nitric acid and hydrofluoric acid mixed solution is used for pickling and stripping the composite sheath, an oxide layer is removed, intergranular corrosion is avoided, a triple sheath synergistic protection mechanism is adopted, oxygen is physically isolated by outer stainless steel, and heat loss is inhibited by a middle yttria-stabilized zirconia ceramic fiber layer.

The utility model discloses a zirconia ceramic processing auxiliary device, and relates to the technical field of zirconia ceramic processing. The cutting device comprises a workbench, the top of the workbench is fixedly connected with a fixing seat, the left side of the fixing seat is provided with an auxiliary assembly, the right side of the fixing seat is provided with a cutting device, the auxiliary assembly comprises an inclined plate, the bottom of the inclined plate is fixedly connected with a supporting plate, and the bottom of the supporting plate is fixedly connected with a fixing plate. According to the utility model, auxiliary components are arranged, specifically, zirconia ceramics are sequentially placed on an inclined plate, an electric push rod II is started to drive a push ring to move towards the right side, the push ring pushes the bottommost zirconia ceramics towards the right side, so that the zirconia ceramics are moved to a power roller, and then the push ring is reset; the zirconia ceramics on the upper portion roll to the position of the push ring, feeding on the lower side is facilitated, manual feeding of workers is not needed, the workers can keep a long distance from the cutter, and potential safety hazards are avoided.

The invention discloses a preparation method and application of zirconia ceramics, and relates to the technical field of zirconia ceramics, and the preparation method comprises the following steps: mixing 100-200nm nano zirconia, 200nm-400nm alumina, a binder, an emulsifier and a dispersant, adopting a high-purity alumina grinding ball as a grinding medium, stirring and grinding for 4-8 hours at a rotating speed of 700-1000r / min, and then grinding for 1-2 hours at a sanding rotating speed of 1500-2000r / min, so as to obtain the zirconia ceramics. Mixed slurry is obtained; carrying out spray granulation on the mixed slurry; the components of the zirconia ceramic are mixed and granulated, Fe3Al is deposited on the surface of the composite ATZ powder in a magnetron sputtering mode, the uniform dispersion effect and binding force of the composite powder are guaranteed, and meanwhile, due to the fact that the composite powder has a similar thermal expansion coefficient with zirconia, the composite powder has good thermal expansion performance under the condition that the fracture toughness, strength and hardness of the composite powder are not sacrificed. The low-temperature thermal shock resistance of the zirconia ceramic is improved, the stability of the zirconia ceramic bearing is ensured, and the thermal shock resistance and strength of the ceramic are remarkably improved compared with a traditional mixed powder preparation process.

The invention belongs to the field of dental implants, and particularly relates to a preparation method and device of a zirconium oxide implant surface osteogenesis-promoting and antibacterial zinc phosphate coating, and the preparation method of the zinc phosphate coating comprises the following steps: S4, mixing zinc oxide, phosphoric acid, nitric acid and deionized water, and adding an additive to prepare a phosphating solution; s5, putting the phosphating solution and the zirconium oxide implant into a reaction kettle, heating the reaction kettle in a baking oven at 150-230 DEG C for 3-12 hours, and taking out the zirconium oxide implant after natural cooling; and S6, carrying out ultrasonic cleaning for 1-5 minutes by adopting deionized water, and drying in a drying oven at 40-60 DEG C to finally obtain the zirconium oxide implant coated with the zinc phosphate coating. The zinc phosphate coating is prepared on the surface of the zirconium oxide dental implant by applying a hydrothermal method, and the zirconium oxide dental implant has good mechanical properties, cytocompatibility, osteogenesis performance and antibacterial performance by changing the formula of a phosphating solution and adjusting the temperature and time of a hydrothermal reaction, and has important significance for expanding clinical application of a zirconium oxide ceramic implant material in the field of oral cavities.

The invention relates to a zirconia ceramic pump body deep hole nanoscale honing process and honing head, and the zirconia ceramic pump body deep hole nanoscale honing process comprises the steps that a composite honing head with a coarse grinding section and a fine grinding section is adopted, and a preset gradient machining process is executed on a target zirconia ceramic pump body; according to the zirconia ceramic pump body deep hole nanoscale honing process and the composite honing head, the gradient machining process is combined with the design of the composite honing head, machining parameters, cooling liquid types and temperature control strategies are dynamically adjusted at different stages, the whole process optimization from rough machining to superfinishing is achieved, and the machining efficiency is improved. The method has the effects of improving the machining efficiency, reducing surface defects and avoiding thermal stress cracks.

The invention provides a rapid sintering method of zirconia ceramic for dentistry and zirconia ceramic, the rapid sintering method of zirconia ceramic for dentistry comprises the following steps: obtaining a pre-sintered body prepared from zirconia powder with stable yttrium oxide, and obtaining a standard active sintering temperature of the zirconia powder; the pre-sintered body is subjected to final sintering in a preset final sintering stage, the zirconia ceramic is obtained, the preset highest sintering temperature in the preset final sintering stage is higher than the standard active sintering temperature, and the difference value between the preset highest sintering temperature and the standard active sintering temperature ranges from 10 DEG C to 60 DEG C. According to the embodiment of the invention, the preset highest sintering temperature in the preset final sintering stage is set to exceed the standard active sintering temperature by 10-60 DEG C, so that the highest sintering temperature of the final sintering process is improved, the final sintering time of the zirconia ceramic is shortened, the production efficiency of the zirconia ceramic product is improved, and the production cost is reduced. And meanwhile, the material can obtain excellent mechanical properties and transparency within an extremely short time.

The invention discloses a zirconia composite ceramic microbead and a preparation method thereof, and belongs to the technical field of zirconia ceramic microbeads. The zirconia composite ceramic microbeads are prepared from 80-90 parts by mass of yttrium-stabilized tetragonal phase zirconia powder, 5-10 parts by mass of alumina powder and 5-10 parts by mass of silicon carbide composite powder. Yttrium-stabilized tetragonal phase zirconia is used as a basic material, alumina and polycrystalline multi-granularity silicon carbide composite powder are used as auxiliary materials, the silicon carbide powder with high wear resistance and high corrosion resistance is used for improving the overall wear resistance and corrosion resistance of the composite ceramic microbead, and after the silicon carbide composite powder is added, the Vickers hardness and strength of the zirconia composite ceramic microbead are obviously improved; and the wear rate is greatly reduced, and the mass loss rate after strong acid solution soaking is greatly reduced. The prepared zirconium oxide composite ceramic microbead is excellent in wear resistance and good in corrosion resistance, meanwhile, the raw materials are wide in source, the preparation method is simple, and the good market prospect is achieved.

The invention relates to the field of materials, and particularly discloses a mildew-proof and antistatic automobile trunk inner lining plate material and a preparation method thereof.The mildew-proof and antistatic automobile trunk inner lining plate material is prepared by adopting flax fibers, zirconia ceramic fibers and carbon fibers to be compounded to serve as a reinforcing framework, conducting vacuum drying and activation on the reinforcing framework, pretreating graphene oxide and dispersing the graphene oxide in a fiber network; according to the present invention, the mold inhibitor and the antibacterial agent are added to form the uniform and lasting release source of the mold inhibitor and the antibacterial agent, and the composite binder and the composite auxiliary agent are adopted, and the graded pressurization cold pressing molding process is adopted so as to compact the fiber network, effectively release the internal stress, and avoid the structural damage caused by the single high pressure so as to obtain the low-porosity and high-strength compact structure; the inner supporting plate material has efficient and broad-spectrum antibacterial performance and rapid and lasting static dissipation capacity, achieves the best balance among mechanical strength, durability, mildew-proof and antistatic performance and environmental protection performance, meets the application requirements of inner lining plates of automobile trunks, and has high practical application value.

The invention relates to the technical field of ceramic materials, in particular to a preparation method of submillimeter zirconia microspheres. The preparation method comprises the following steps: adding an isobutylene-maleic anhydride copolymer, butyl glycidyl ether and ammonium citrate into water, then adjusting the pH value of the solution to be alkaline by using an alkaline solution, and adding a defoaming agent and yttria-stabilized zirconia powder to obtain a premixed solution; carrying out ball milling on the premixed liquid, and then carrying out vacuum bubble removal to obtain zirconium oxide slurry; injecting the zirconium oxide slurry into an oily medium to obtain a zirconium oxide ceramic microbead green body; cleaning the zirconia ceramic microbead green body, drying, carrying out gradient heating calcination, and carrying out autogenous grinding to obtain the submillimeter zirconia microbead; the gel microspheres can be formed only by adding three organic matters, and the gel microspheres are low in organic matter content and free of toxicity. The method disclosed by the invention is high in yield, simple to operate and low in cost, and the prepared zirconium oxide microbeads are uniform in particle size and have relatively high density and mechanical properties.

The invention belongs to the technical field of ceramic materials, and discloses a zirconia ceramic containing nanofiber alumina and stabilized by yttrium oxide, the zirconia ceramic contains 3 mol% of Y2O3, the concentration of nanofiber Al2O3 in the composite ceramic is 0.95 vol%-1.9 vol%, and the sintering temperature is 1400-1500 DEG C. The invention also discloses a preparation method of the zirconia ceramic. The low-temperature hydrothermal aging resistance of the yttria-stabilized zirconia ceramic can be greatly improved by adding a proper range of nano-fiber alumina; the addition of a proper range of nanofiber alumina has no significant influence on the rheological properties of the yttrium oxide-stabilized zirconia ceramic, and the void ratio of the pressed zirconia ceramic is not greatly different from that of the zirconia ceramic not added with the nanofiber alumina.

According to the low-shrinkage 3D printing zirconia ceramic and the preparation process thereof, photosensitive polyimide is selected, the photosensitive polyimide has an imine ring and a photosensitive group on a macromolecular chain and has the advantages of excellent photosensitivity, thermal stability, low volume shrinkage and the like, a photoinitiator does not need to be added into a product system, and the preparation process is simple. Curing can be directly completed under ultraviolet irradiation, and the problems of ceramic shrinkage, cracking and the like caused by volatilization or decomposition of a photoinitiator in a workpiece during degreasing are avoided; the ratio of the dispersing agent to the plasticizer in the product system is optimized, the viscosity of the slurry is reduced, the solid content is increased, the shrinkage rate after sintering is reduced, and the flowability and the printing precision of the slurry are ensured. Besides, by combining a flash sintering treatment process, grain growth coarsening is inhibited, a nanoscale compact structure is realized, and internal defects are reduced, so that the zirconia ceramic prepared by the method has the advantages of no defect, compact structure, smaller grain size (smaller than 1 mu m), excellent fracture toughness and higher relative density.

The invention discloses a preparation method and application of high-toughness anti-aging zirconia ceramic, and relates to the technical field of ceramic materials.The preparation method comprises the following steps that nano monoclinic zirconia with the D50 being 20-50 nm and the mass fraction being 99.7-99.8 wt%, aluminum oxide with the D50 being 200-400 nm and the mass fraction being 0.2-0.3 wt% and a dispersing agent are taken, and the dispersing agent accounts for 1-1.5 wt% of the total mass of powder; the preparation method comprises the following steps: by taking a high-purity aluminum oxide grinding ball as a grinding medium, stirring and grinding for 2-4 hours at the rotating speed of 700-1000r / min, and then grinding for 1-2 hours at the sanding rotating speed of 1500-2000r / min to obtain mixed slurry; nano monoclinic zirconia is adopted as a raw material, aluminum oxide and a dispersing agent are added for co-grinding, Y2O3 is deposited on the surface of ATZ composite powder in a magnetron sputtering mode, and a Y2O3 deposition layer can inhibit conversion from t-zirconia to m-zirconia, so that the anti-aging performance of the zirconia ceramic is improved, and the service life of the zirconia ceramic is prolonged. And the nano monoclinic zirconium oxide is directly mixed and ground with the aluminum oxide, so that the zirconium oxide raw material is more easily subjected to stress-induced phase change, and the toughness performance of the zirconium oxide ceramic is improved.

The invention relates to a method for improving low-temperature aging resistance of zirconia ceramic by utilizing defect engineering, which comprises the following steps: S1, preparation of zirconia slurry: taking zirconia powder with 3 mol% of yttrium oxide as a stabilizer as a raw material, and weighing the zirconia powder and deionized water according to a mass ratio of (1.5-2.5): 1; citric acid or acetic acid or nitric acid is dropwise added into deionized water, and the pH is adjusted to be 2.5-4; adding zirconium oxide powder into the adjusted aqueous solution step by step, and stirring to obtain zirconium oxide slurry; s2, introduction of powder intragranular defects: pouring the zirconium oxide slurry obtained in the step S1 into a sand mill, carrying out sanding treatment for 8-12 hours by adopting zirconium oxide microbeads as a medium, and introducing blade dislocation and lattice distortion crystal defects into zirconium oxide powder crystals; s3, after the powder containing the intragranular defects obtained in the step S2 is formed, pressureless sintering is conducted at the temperature of 1350-1425 DEG C in the air atmosphere, and the compact 3Y-TZP zirconia ceramic containing the intragranular defects is obtained. The phase transformation of the zirconia ceramic from a tetragonal phase to a monoclinic phase can be effectively inhibited, and the low-temperature aging resistance of the zirconia ceramic is improved.

According to the probe card module and the manufacturing process, the manufacturing cost is low, the stability is high, the abrasion resistance is good, the service life is long, and low-loss transmission of high-frequency signals can be guaranteed. The device comprises a bottom plate, the bottom plate is provided with a first limiting rotating shaft, the first limiting rotating shaft is sleeved with a plurality of shifting blocks, ceramic chips are arranged at the ends of the shifting blocks, the ceramic chips are zirconia ceramics, and the ends of the ceramic chips are bonded with probes through UV glue. The method is applied to the technical field of semiconductor testing.

The zirconium oxide ceramic modified by the graphene / zirconium oxide calcined composite microspheres is prepared from stable zirconium oxide powder A and the graphene / zirconium oxide calcined composite microspheres accounting for 25 wt% or below of the total ceramic powder through mixing, compression molding and sintering, the preparation method of the graphene / zirconium oxide calcined composite microspheres comprises the following steps: preparing stable zirconium oxide powder B, graphene and a solvent into slurry; and carrying out ball milling, spray drying and calcination to obtain the graphene / zirconium oxide calcined composite microspheres. According to the present invention, the graphene / zirconium oxide calcination composite microsphere and the SPS sintering are performed, such that the dispersed graphene / zirconium oxide two-phase structure region exists in the obtained zirconium oxide composite ceramic so as to consume the large amount of the crack growth energy, and the significant toughening effect is provided.

The invention relates to the technical field of brazing, in particular to a low-temperature preparation method of a nickel-titanium alloy / zirconia ceramic corrosion-resistant joint. In order to solve the problems that an implantable medical device prepared through an existing NiTi shape memory alloy and zirconia ceramic connecting method is poor in biocompatibility and not suitable for long-term service in a human body, the invention provides the NiTi shape memory alloy and zirconia ceramic low-temperature indirect brazing method which is good in biocompatibility and excellent in corrosion resistance. The brazing method comprises the following steps: (1) preparing metallized brazing filler metal; (2) metalizing the zirconia ceramic; (3) brazing the NiTi alloy and the zirconia ceramic; after the obtained joint is subjected to an electrochemical test in SBF simulated body fluid, the corrosion resistance is good; the highest strength of a brazed joint is 31 MPa, and the use strength of an implantable medical device can be met.

The invention relates to the technical field of fluid conveying equipment, in particular to a corrosion-resistant composite ceramic isolation sleeve for a magnetic drive pump, a preparation method and the magnetic drive pump. By adopting the specific compound proportion of the lithium oxide ceramic and the zirconium oxide ceramic, the magnetic drive pump isolation sleeve has excellent corrosion resistance and mechanical strength, is particularly suitable for conveying nitrogen tetroxide and other strong corrosive media, and remarkably improves the service life and the reliability of the magnetic drive pump isolation sleeve. The preparation method provided by the invention ensures that the material ratio is accurate, the structure is uniform, the performance is stable, and the method is suitable for large-scale production. The specific number of pairs of magnetic poles is adopted to be matched with the optimized isolation sleeve, so that the maximization of magnetic torque and the minimization of eddy-current loss are realized, and the transmission efficiency and the operation stability of the magnetic drive pump are integrally improved.

This invention discloses a composite rare earth oxide co-stabilized zirconia ceramic microsphere and its preparation method, belonging to the technical field of zirconia ceramic microspheres. The zirconia ceramic microspheres are prepared from 80-90 parts by mass of tetragonal zirconia (ZrO2) powder, 0.5-1 parts by mass of alumina (Al2O3) powder, 5-10 parts by mass of yttrium oxide (Y2O3) powder, and 5-10 parts by mass of composite rare earth oxide powder. This invention uses tetragonal zirconia as the base material, adds yttrium oxide (Y2O3) as a stabilizer, and further adds composite rare earth oxides ytterbium oxide (Yb2O3) and nano-gadolinium oxide (Gd2O3). Yb2O3 serves as the second stabilizer, while Gd2O3 enhances the ferroelastic toughening effect of the ceramic. The combined effect of the two rare earth oxides increases the strength of the zirconia ceramic microspheres.

The present invention relates to a zirconia ceramic containing a glass phase, comprising 1.0-5.5 wt% of a YASZ glass phase and the balance a 3Y-TZP crystalline phase, wherein the YASZ glass phase is located between grains of the 3Y-TZP crystalline phase. The YASZ glass phase comprises 15-35 wt% Y2O3, 10-30 wt% Al2O3, 35-55 wt% SiO2, and 4-10 wt% ZrO2, and the dihedral angle formed between the YASZ glass phase and the 3Y-TZP crystalline phase is 62-85°. The present invention also relates to a bone implant prosthesis prepared from the zirconia ceramic containing the glass phase.

This utility model provides a cutting cover for processing zirconia ceramic blocks, comprising: a processing table, on the upper surface of which a processing support is fixedly connected, and a cutting tool holder and a positioning mechanism are mounted on the processing support; a cutting cover body, mounted on the processing table, with a door slidably mounted at the front end of the cutting cover body, an observation window mounted on the door body, and an electric push rod fixedly mounted on the inner wall of the cutting cover body, the output end of which is fixedly connected to the upper end of the door body; and a dust collection unit, mounted on the processing table and the cutting tool holder. This cutting cover for processing zirconia ceramic blocks shields the workpiece and equipment during the cutting process, and, with the cooperation of the dust collection unit, collects the dust generated during cutting, avoiding potential safety hazards during cutting and preventing dust pollution of the working environment, thus protecting the health of operators.

The utility model discloses a push-pull box type electric furnace for zirconia ceramic processing, which relates to the technical field of sintering equipment, and comprises a furnace body and a furnace door, a kiln car is movably arranged in the furnace body, the furnace door and the kiln car are integrally designed, a Z-shaped sealing step part is arranged on the side surface of the kiln car, a sealing groove matched with the sealing step part is arranged on the furnace body, and the Z-shaped sealing step part is arranged in the sealing groove. The height of the kiln car can be increased and decreased, a sealing gap between the sealing groove and the sealing step part can be changed, a moving rail is arranged at the bottom of the furnace body in the moving direction of the furnace door and the kiln car, a moving platform is arranged on the moving rail, and the furnace door and the kiln car are arranged on the moving platform; silicon molybdenum rods are hung on the inner side wall and the top of the furnace body, the furnace door and the kiln car are integrally designed in a lifting mode, a Z-shaped sealing step part is arranged on the side face of the kiln car and matched with a sealing groove in the furnace body, and tight sealing of a hearth is achieved.

The utility model belongs to the technical field of zirconia ceramic knife production, and particularly relates to a surface opening device for zirconia ceramic knife production, which comprises a shell, a strip-shaped plate, a support adjusting component, two clamping plates, a lifting adjusting component, a driving component, two rotating shafts, two polishing wheels and a dip angle adjusting component, rectangular openings are formed in the front side and the rear side of the shell correspondingly, the strip-shaped plate and the supporting adjusting assembly are arranged in the shell, the strip-shaped plate is connected with the supporting adjusting assembly, a strip-shaped opening is formed in the strip-shaped plate, the two clamping plates are slidably installed in the strip-shaped opening, the lifting adjusting assembly is arranged on the two clamping plates, and the lifting adjusting assembly is connected with the strip-shaped opening. The two rotating shafts are rotationally installed on the inner wall of the top of the shell, and the driving assembly is arranged on the top of the shell and connected with the two rotating shafts. The double-sided synchronous opening device is reasonable in design, easy and convenient to operate, good in machining precision and machining efficiency and capable of achieving double-sided synchronous opening operation.

The invention discloses a powder spreading method and a powder spreading system of a zirconia ceramic block dry press for all-ceramic false teeth. The powder spreading method comprises the following steps: pouring quantitatively weighed zirconia powder into a pressing chamber; a powder spreading device is inserted into the material pressing cavity according to the first preset depth; the powder spreading device comprises a motor and a push plate which are sequentially connected in the longitudinal direction. The motor is used for driving the push plate to rotate with the center line of the pressing cavity as the axis. A motor is started to drive a push plate to rotate forwards, and first-time flattening is completed; the powder spreading device is lifted according to a second preset depth; the motor is started to drive the push plate to rotate reversely, and second-time flattening is completed; and the powder spreading device is withdrawn from the material pressing cavity. And through two-time flattening operation, the zirconium oxide powder in the material pressing cavity is uniformly flattened, so that the situation of local accumulation or local powder shortage is reduced, and the quality of dry pressing processing is favorably improved.

The graphene / zirconia sintered composite microsphere modified zirconia ceramic is prepared by mixing, pressing and sintering stable zirconia powder A and graphene / zirconia sintered composite microspheres accounting for less than 25wt% of the total ceramic powder; the preparation method of the graphene / zirconia sintered composite microspheres is that stable zirconia powder B, graphene and a solvent are matched into a slurry; the graphene / zirconia sintered composite microspheres are obtained through ball milling, spray drying and calcination. The graphene / zirconia sintered composite microspheres and SPS sintering are used in the application, the obtained zirconia composite ceramic has dispersed graphene / zirconia two-phase structure regions in the interior, can consume a large amount of energy of crack propagation, and has a significant toughening effect.

The present invention discloses a method for preparing ultra-high temperature ceramic hollow microspheres, which comprises the following steps: performing solvothermal treatment on a precursor solution containing zirconium silicate solution and phenolic resin to obtain precursor microspheres; and calcining the precursor microspheres in segments to obtain ultra-high temperature ceramic hollow microspheres. The ultra-high temperature ceramic hollow microspheres prepared by the present invention, during high-temperature service, near the phase transition temperature of zirconia, the phase transition of zirconia ceramics occurs, and the microspheres are prone to rupture in a high-temperature thermal shock environment. And the silica softened near this phase transition temperature becomes a buffer medium for volume shrinkage and expansion during the temperature change process, ensuring the integrity of the hollow microspheres. Moreover, the zirconia-silica composite ultra-high temperature ceramic hollow microspheres of the present invention have excellent heat resistance. The components zirconia / silica contained in the coating are common high-temperature oxide systems, and the melting point of zirconia is as high as 2700 °C.

The utility model relates to the technical field of ceramic substrates, in particular to a low-temperature sintered zirconia ceramic substrate. The low-temperature sintered zirconia ceramic substrate comprises a zirconia ceramic substrate body, a lower insulating layer fixedly connected to the lower end of the zirconia ceramic substrate body, and alignment holes distributed in the surface of the upper end of the zirconia ceramic substrate body at intervals; meanwhile, a Cu seed layer is formed on the surface of the upper end of the zirconia ceramic substrate body; forming a metal layer on the surface of the upper end of the Cu seed layer; the low-temperature sintered zirconia ceramic substrate is calibrated and aligned in advance, and then the circuit board is manufactured, so that the manufactured circuit board is high in precision; and high temperature is not needed in the manufacturing process, so that the energy consumption is relatively low.

The invention provides a brazing method suitable for a medical implantable ceramic tube shell. The brazing method comprises the steps that a zirconia ceramic workpiece is cleaned; performing vacuum magnetron sputtering on the surface of the cleaned zirconia ceramic workpiece, and sequentially depositing a bottom metal layer and a surface metal layer to form a metalized layer; performing vacuum heat treatment on the zirconia ceramic workpiece with the metalized layer so as to eliminate the internal stress of the metalized layer; acid pickling is conducted on the surface of the pure titanium metal piece to remove an oxidation film, and drying treatment is conducted; placing a gold solder between the metallization layer and the pure titanium metal piece, and assembling an assembly to be welded; according to the method, a to-be-welded assembly is placed in a vacuum brazing furnace to be brazed, preset heating, heat preservation and cooling procedures are executed, and high-strength, high-airtightness and excellent-biocompatibility connection between zirconia ceramic and pure titanium is achieved through an optimized surface metallization process, stress relief treatment and a strictly-controlled full-process vacuum brazing process.