57 results about "Reaction layer" patented technology

Provided is a method that allows for the etching of a silicon nitride film with respect to a silicon oxide film with high selectivity and high precision while preventing a degradation in the shape of the silicon oxide film portion during etching. The etching method of dry etching a film structure which is formed in advance on a wafer disposed in a processing chamber and in which an end portion of a film stack including a silicon nitride film and silicon oxide films vertically sandwiching the silicon nitride film forms a sidewall of a trench or hole, by supplying a gas for processing into the processing chamber, without using plasma includes: forming, as a first process, a reaction layer on the silicon nitride film by reaction of hydrogen fluoride gas at 30° C. or higher and 55° C. or lower; removing, thereafter, as a second process, the reaction layer having been formed in the first process, through volatilization by performing heating at 70° C. or higher and 110° C. or lower without causing the hydrogen fluoride gas to flow; and etching the silicon nitride film from the end portion in a lateral direction by performing the first and second processes a plurality of times.

The invention belongs to the technical field of surface engineering, and relates to a preparation method of a protective coating for a metal connector of a solid oxide battery. A compact transition metal oxide inner layer is deposited on a metal substrate in a reactive sputtering mode, then a transition metal alloy outer layer is deposited in a metal sputtering mode, a transition metal oxide / transition metal alloy composite coating is formed, and a spinel protective layer is formed after annealing treatment. According to the method, a transition metal oxide inner layer is used as a diffusion barrier layer, diffusion of elements such as Cr from a substrate to a coating and diffusion of oxygen to the substrate in the high-temperature annealing and long-term service process are effectively inhibited, and therefore the thickness of a reaction layer and the thickness of a thermal growth oxide layer are remarkably reduced. The composite coating is compact in structure, stable in component, good in matching with the thermal expansion coefficient of the substrate, excellent in oxidation resistance and low in surface specific resistance, and capable of effectively improving the long-term operation stability and prolonging the service life of the SOC connector.

The invention provides a nitrogen-containing boric acid ester-nano hybrid composite anti-wear additive as well as a preparation method and application thereof, and belongs to the technical field of lubricating oil additives. The nitrogen-containing boric acid ester, the functionalized nanoparticles, the ionic liquid, the auxiliary anti-wear agent and the dispersion stabilizer are subjected to nano-scale hybrid compounding, and the nitrogen-containing boric acid ester, the functionalized nanoparticles, the ionic liquid, the auxiliary anti-wear agent and the dispersion stabilizer have a synergistic effect on four aspects of physical bearing, chemical adsorption, interface modification and extreme pressure enhancement; a multi-synergistic lubrication and protection system of an adsorption film, a physical isolation layer, an extreme pressure reaction layer and rolling lubrication microspheres is constructed, efficient wear resistance, friction reduction, bearing and stability improvement are jointly achieved, and the lubricating oil is suitable for insoluble base oil.

A method for forming a semiconductor device provides a substrate having a patterned structure containing a semiconductor material, wherein the patterned structure has a side profile including depressions, such as a patterned film stack, and a spacer layer conformally deposited on and within the depressions of the patterned structure; and a reaction layer formed on the spacer layer by reacting the surface of the spacer layer with a plasma-excited first etching gas, wherein the plasma-excited first etching gas contains fluorine, hydrogen, and nitrogen to form the reaction layer, and at least a portion of the reaction layer is removed by ion bombardment caused by exposure to a plasma-excited second etching gas. The spacer layer may be SiOCN. The reaction layer may be ammonium silicofluoride. The first etching gas may contain SF6, H2, and N2, or NF3, H2, and N2. The reaction and removal may be carried out at room temperature in the same chamber.

The invention discloses a magnesia-carbon-based refractory brick and a preparation method thereof, relates to the technical field of display optical films, and belongs to the technical field of surface modification of refractory materials. A sacrificial reaction layer and a transition bonding layer are prepared on the surface of the magnesia carbon brick through pretreatment of a base brick, preparation of coating slurry, gradient coating, curing and heat treatment; wherein the sacrificial reaction layer can realize high-temperature instant cooling through a controllable endothermic reaction, and meanwhile, a reaction product forms a compact protective layer to block slag permeation; the preparation process is simple and controllable, the prepared coating is firmly combined with the magnesia carbon brick body, the high-temperature oxidation resistance and the slag penetration resistance of the magnesia carbon brick can be remarkably improved, the service life of the magnesia carbon brick can be remarkably prolonged, and the magnesia carbon brick has the advantages of low cost and high practicability. The method is suitable for magnesia carbon brick protection under severe working conditions of high-temperature metallurgical furnaces and kilns and the like.

The application provides a composite carbon material and a preparation method thereof, and the preparation method at least comprises the following steps: providing a carbon base; mixing a tantalum-containing compound with an organic solvent to obtain a tantalum-containing slurry; uniformly covering the tantalum-containing slurry on the surface of the carbon base to obtain a reaction layer on the carbon base; uniformly covering tantalum powder on the reaction layer to obtain a tantalum metal coating layer on the reaction layer; heating the carbon base with the tantalum metal coating layer to a preset temperature under a vacuum state, and keeping the temperature for a preset time; and cooling the heated carbon base to room temperature to obtain the composite carbon material. Through the composite carbon material and the preparation method thereof, the compactness and quality of the tantalum carbide coating layer can be improved.

The application discloses a brazing filler metal for titanium alloy and stainless steel connection and application thereof, and the brazing filler metal comprises an Ag-Cu eutectic brazing filler metal base and NiTi alloy particles. By introducing the NiTi alloy particles into the Ag-Cu eutectic brazing filler metal base, the Ni and Ti in the interface neighborhood are cooperatively involved in diffusion and reaction, the wetting and forming consistency of the brazing filler metal are cooperatively improved, the interface reaction layer is formed into a discrete thin layer, the continuous brittle reaction layer is inhibited from being generated, the risk of crack propagation along the interface is reduced, the shear strength of the brazing filler metal welding joint for titanium alloy and stainless steel connection is remarkably improved, and the forming quality and batch consistency of the brazing joint are improved.

This utility model belongs to the technical field of lubricating oil additive production equipment. Specifically, it discloses a reaction device for producing lubricating oil additives. The reaction tank is equipped with a stirring shaft, and the stirring shaft is fixedly connected from top to bottom with a paddle stirring blade, a double spiral stirring blade, and a turbine stirring blade. A processing box is fixedly connected to the top of the condenser, and a condenser tube is installed inside. A water pipe is sleeved on the outside of the straight part of the condenser tube, and a spiral guide plate is installed on the straight part inside. A vertically arranged reaction layer is fixedly connected in the second chamber, and several horizontally arranged activated carbon layers are fixedly connected in the first chamber. A liquid outlet pipe is fixedly connected to the bend at the lower end of the condenser tube. This utility model makes the reaction more uniform by setting three different stirring blades. By setting the condenser tube, reaction layer, and activated carbon layer, harmful gases can be purified multiple times to avoid environmental pollution.

The invention relates to the technical field of metal-based composite materials, in particular to a nanometer lanthanum hexaboride reinforced titanium-based composite material and a preparation method of the nanometer lanthanum hexaboride reinforced titanium-based composite material. The composite reinforcements are uniformly dispersed in the titanium alloy matrix; wherein the composite reinforcement is of a core-shell structure, the core of the core-shell structure is nano lanthanum hexaboride particles, and the shell layer of the core-shell structure is an in-situ reaction layer coating the outer surfaces of the nano lanthanum hexaboride particles; the in-situ reaction layer is a transition layer with components and a structure in gradient change, and the transition layer at least comprises a La / B-rich amorphous transition region and a TiB whisker layer which are distributed from inside to outside. According to the preparation method, low-energy mixing and spark plasma sintering are adopted, controllable in-situ reaction of nano LaB6 and Ti is induced, a LaB6 core and gradient reaction layer core-shell structure composite reinforcement is constructed, and nano La2O3 particles are separated out, so that reinforcement phase agglomeration is inhibited, interface bonding is improved, and the contradiction of strong plasticity inversion is solved.

The utility model discloses an assembly structure for synthesizing diamonds by a high-temperature and high-pressure method, which relates to the technical field of diamond synthesis and comprises an outer layer structure, a middle layer heating and insulating system, a core reaction layer and a top covering layer which are sequentially arranged from outside to inside, the outer-layer structure comprises a pyrophyllite composite block, a pyrophyllite ring surrounding the outer side of the pyrophyllite composite block and a conductive steel cap fixed to the top, the middle-layer heating and insulating system comprises a heating sleeve embedded into the pyrophyllite composite block, a heating piece is arranged in the heating sleeve, a magnesium oxide insulating sleeve is wrapped in the heating piece, and the outer-layer structure and the middle-layer heating and insulating system are arranged in the heating sleeve. A vertically supported thick zirconium oxide column is arranged below the heating sleeve, the core reaction layer comprises a magnesium oxide crystal bed, a carbon source is placed on the magnesium oxide crystal bed, alloy is distributed around the carbon source, and the top covering layer comprises a thin zirconium oxide column covering the core reaction layer. The problems that in the prior art, obtained seeds with high carbon content grow fast, but the impurity removal capacity is weak, and the quality is poor are solved; the seeds with low carbon content are good in quality but small in size, and the economic benefit is low.

The invention belongs to the technical field of superconducting material processing, and discloses a magic angle graphene modified niobium-tin superconducting wire and a preparation method thereof. The magic angle graphene is modified on the surface of the core wire of the Nb3Sn superconducting wire prepared by the bronze method, the material can eliminate work hardening of a bronze matrix, and one-time and uninterrupted continuous stretching forming from a composite billet to the final wire is realized. In addition, the Nb3Sn superconducting wire has excellent mechanical performance, superconducting performance and strain tolerance, the magic angle graphene layer can effectively inhibit crack initiation and expansion of the Nb3Sn reaction layer under strain, and the mechanical performance of the wire is improved; the material not only can be used as an additional magnetic flux pinning center, but also can induce formation of finer Nb3Sn grains with tough grain boundaries, so that the critical current density of the wire is remarkably improved; the critical current irreversible strain limit of the Ni3Sn superconducting wire modified by the magic angle graphene is 0.8% and is obviously higher than that of a Ni3Sn superconducting wire prepared by a traditional bronze method.

This invention relates to the field of nanomaterials technology, and discloses a vanadate composite material, its preparation method, and its application. A reaction solution containing a surfactant is prepared to generate bubbles. These bubbles then act as soft templates under rapid stirring and heating. Vanadium oxide is dispersed in this reaction solution and reacted at a specific temperature for a certain time, allowing the surfactant to intercalate the vanadium oxide, transforming it into vanadate. The surfactant then coats the outer surface of the vanadate, resulting in an in-situ surface-modified vanadate composite material. The surfactant layer of this composite material can regulate the reaction layer between the electrode surface and the electrolyte, preventing electrode material dissolution or structural collapse during the electrochemical reaction process, thus significantly improving the performance of electrochemical energy storage devices. The foaming effect of the surfactant ensures that the bubbles are uniformly dispersed in the liquid, acting as soft templates for the attachment and growth of vanadate crystals.

An expiration date indicator includes a first protective sheet that prevents oxygen intrusion, an oxygen transmission film disposed beneath the first protective sheet, wherein the oxygen transmission film is composed of a plurality of separable layers, a reaction layer disposed beneath the oxygen transmission film, wherein the reaction layer reacts with oxygen and changes color, a support layer disposed beneath the reaction layer, wherein the support layer is formed of an adhesive material, and a second protective sheet disposed beneath the support layer and preventing deterioration of the support layer.

The invention relates to a ceramic-metal brazed joint with a nanocrystalline interface reaction layer and a preparation method and application of the ceramic-metal brazed joint, and belongs to the technical field of heterogeneous material connection. The invention discloses a ceramic-metal brazed joint with a nanocrystalline interface reaction layer. The ceramic-metal brazed joint comprises a ceramic matrix, a metal matrix, an active brazing filler metal layer and a nanocrystalline structure layer, wherein the active brazing filler metal layer is used for connecting the ceramic matrix and the metal matrix, and the nanocrystalline structure layer grows in situ between the active brazing filler metal layer and the ceramic matrix. According to the nanocrystalline reaction layer disclosed by the invention, the interface bonding strength and the thermal shock resistance of the joint are remarkably enhanced through a fine grain strengthening and toughening mechanism in combination with the structural isotropy of the nanocrystalline reaction layer, and the excellent sealing reliability of the joint in a severe environment is ensured; the method is suitable for aerospace thermal protection, high-power electronic device packaging and preparation of high-temperature and high-pressure sensor sealing components.

The invention provides a ceramic / metal multilayer brazing structure and a preparation method and application thereof, and relates to the technical field of electronic packaging. The ceramic / metal multilayer brazing structure comprises a ceramic substrate, a titanium layer, a diffusion barrier layer and a nano bonding layer from bottom to top, wherein the thickness of the diffusion barrier layer is 10-40nm. According to the ceramic / metal multi-layer brazing structure, the diffusion barrier layer is additionally arranged between the titanium layer and the nano bonding layer, Ti atoms can be effectively prevented from diffusing upwards to the Cu or Ag layer, generation of a brittle Ti-Cu reaction layer is inhibited, disintegration of the multi-layer structure and interface embrittlement can be effectively prevented, and the service life of the ceramic / metal multi-layer brazing structure is prolonged. Therefore, the integrity of the amorphous Ag / Cu multilayer structure is kept, the long-term reliability of the joint is improved, the interface structure of the joint is more uniform, the stress concentration is reduced, and the reliability under long-term thermal cycle and mechanical shock is remarkably improved.

The utility model belongs to the technical field of ionizing radiation detection, and particularly relates to a halide scintillation crystal detector for petroleum logging. The device comprises a shell and a reaction layer, the shell is a sealed shell, a scintillation crystal is packaged in the shell, and a light transmission device is coupled to a light emitting surface, corresponding to the scintillation crystal, of the shell; and the reaction layer is filled between the shell and the scintillation crystal and is used for absorbing water and oxygen. The utility model is used for solving the problem that the scintillation crystal is easy to deliquesce at high temperature. By filling the reaction layer in the shell for sealing and packaging the scintillation crystal, trace water and oxygen in a sealing system are removed by utilizing the reaction between the reaction layer and water and oxygen in the shell, so that the problem of deliquescence of the scintillation crystal caused by reaction between water and oxygen and the scintillation crystal is avoided.

The invention discloses a method for reducing appearance marks on a copper surface after AMB solder etching, and the method comprises the following specific steps: S1, pressing and cutting a high-purity oxygen-free copper strip into a copper foil with the same size as supplied ceramic, and carrying out surface treatment; s2, stacking the high-purity oxygen-free copper strip and the ceramic for welding; s3, before silk-screen printing, the active metal brazing filler metal is taken out of the environment at the temperature below zero and placed at the room temperature for a period of time, and bubbles in the brazing filler metal are removed; s4, the active metal solder is combined with the high-purity oxygen-free copper strip and the ceramic substrate, and a reaction layer capable of being wetted by the liquid solder is generated; s5, performing chemical etching on the copper on the surface of the ceramic; s6, the preparation ratio of the hydrogen peroxide to the ammonia water to the EDTA-2Na is 13L: 10L: 1260g; s7, cutting the ceramic substrate; according to the method, the problem of copper surface corrosion is solved, the operation time is shortened, and the productivity is improved.

This invention provides a Joule-thermal hollow fiber membrane reactor and membrane separation method, belonging to the field of hydrogen production. It includes a reactor shell and a metal hollow fiber membrane. The reactor shell forms a chamber with a material inlet and outlet. The metal hollow fiber membrane is disposed within the chamber and is cylindrical, comprising a separation layer and a reaction layer stacked along its diameter. The separation layer and / or reaction layer are electrically connected to a power supply circuit. As the current intensity flowing through the separation layer increases, the temperature of the separation layer increases; as the current intensity flowing through the reaction layer increases, the temperature of the reaction layer increases. Along the axis of the metal hollow fiber membrane, the reaction layer forms reaction sections at different temperatures, and the separation layer forms separation sections at different temperatures. Compared with existing technologies, this invention solves the technical problem of poor hydrogen production efficiency caused by defects in the structure of existing Joule-thermal reactors in hydrogen production processes.

The utility model relates to resin magnetizing equipment for a high-speed water treatment stable suspension reaction layer, and discloses equipment which can magnetize magnetic ion exchange resin in a box body by driving a magnetic rod core frame and a plurality of magnetic rod cores connected with the magnetic rod core frame to slide through an air cylinder. The current intensity of a single drawing magnetic rod is small, the magnetic field change tends to be stable, a plurality of small-current drawing magnetic rods are uniformly arranged to directly magnetize the magnetic ion exchange resin, the generated magnetic field is more uniform, and the magnetic uniformity among magnetic ion exchange resin individuals is effectively improved. The device is characterized in that the device comprises an outer frame, a box body and a magnetizing assembly, the outer frame is arranged on the box body, the magnetizing assembly is arranged on the outer frame, the magnetizing assembly comprises a pull-out magnetic bar and a magnetic bar core fixing grid plate capable of sliding up and down, a shell of the pull-out magnetic bar is fixedly arranged on the outer frame, and a part of the shell is located in the box body; and a magnetic rod core of the drawing magnetic rod is connected with the magnetic rod core fixing grid plate.

The invention provides an anisotropic low-magnetic self-propagating connection thin film, a preparation method and a ceramic circuit board assembling method, and belongs to the technical field of semiconductor packaging. The anisotropic low-magnetic self-propagating connection thin film comprises a reaction layer and a light inhibition coating which are arranged in a stacked mode. Wherein the reaction layer comprises a plurality of first component layers and a plurality of second component layers, the first component layers and the second component layers are sequentially and alternately stacked, and the components of the first component layers and the second component layers are any one of Zr-B, Hf-B, Zr-Si, Ta-Si, Ti-C and V-Al; and the light-inhibiting coating is formed by nano-texture blackened carbon or coarsened TaN. The self-propagating system disclosed by the invention is a low-magnetism system, the high-speed electrical performance and magnetic cleaning requirements are met, and the high-frequency loss and EM interference on the CPW / microstrip line are reduced.

The invention provides a brazing method for modified porous SiC ceramic and 2507 duplex stainless steel, and belongs to the technical field of welding. The brazing method comprises the following steps that silicon carbide suspension slurry is prepared; adhering the silicon carbide suspension slurry to the surface of the porous SiC ceramic, drying, discharging glue, and sintering to obtain the modified porous SiC ceramic; and after the surface of the pretreated porous SiC ceramic is polished, 2507 duplex stainless steel, the high-entropy alloy brazing filler metal and the modified porous SiC ceramic are stacked from top to bottom, vacuum brazing is carried out, and natural cooling is carried out at the room temperature after the reaction is finished. According to the method, the porous SiC ceramic surface with poor welding performance is subjected to densification modification treatment, the high-entropy alloy brazing filler metal is good in fluidity and can be well combined with the densified surface layer, the residual stress of the porous ceramic and a metal reaction layer is reduced, and the porous ceramic and metal can form the compact reaction layer with a stable structure under the action of the brazing filler metal.

The invention relates to a method for transferring a structure (2', 2), which is arranged on a substrate (1, 1') and / or which is embedded in the substrate (1, 1'), from an actual state into a target state, in particular before further processing, e.g. singulation or accommodation into a substrate holder (6), or / or before and / or during a bonding of substrates (1, 1'), comprising: - Providing a substrate (1, 1') having at least one structure (2', 2) in the actual state, - Providing at least one reaction layer (5r) which is integrated in particular into a layer system (3), - Implementing an operative connection between the at least one reaction layer (5r) and the substrate (1, 1') in such manner that a state of change in the at least one reaction layer (5r) causes a deformation in the substrate (1, 1'), - Triggering the state of change in the at least one reaction layer (5r) by means of an influencing means (8), wherein the state of change in the at least one reaction layer (5r) is induced in a locally limited manner such that the structure (2', 2) is transferred from the actual state into the target state.

The invention provides a plasma processing method capable of constructing a self-limited process excellent in mass productivity in a cycle etching method in which an adsorption step of forming a reaction layer on a surface of an etching target wafer and a desorption step of removing the formed reaction layer using a rare gas in a metastable state are repeated. The plasma processing method includes: an adsorption step of forming a reaction layer on an etching target film by plasma generated using a reactive gas; and a desorption step of removing the reaction layer using the rare gas in the metastable state generated by the plasma. The adsorption step and the desorption step are repeated, and a pressure of the adsorption step is higher than a pressure of the desorption step.

The invention relates to a method for transferring a structure (2', 2), which is arranged on a substrate (1, 1') and / or which is embedded in the substrate (1, 1'), from an actual state into a target state, in particular before further processing, e.g. singulation or accommodation into a substrate holder (6), or / or before and / or during a bonding of substrates (1, 1'), comprising: - Providing a substrate (1, 1') having at least one structure (2', 2) in the actual state, - Providing at least one reaction layer (5r) which is integrated in particular into a layer system (3), - Implementing an operative connection between the at least one reaction layer (5r) and the substrate (1, 1') in such manner that a state of change in the at least one reaction layer (5r) causes a deformation in the substrate (1, 1'), - Triggering the state of change in the at least one reaction layer (5r) by means of an influencing means (8), wherein the state of change in the at least one reaction layer (5r) is induced in a locally limited manner such that the structure (2', 2) is transferred from the actual state into the target state.

The invention discloses a long glass fiber reinforced polyurethane composite material and a preparation process and application thereof.The long glass fiber reinforced polyurethane composite material adopts calcium ion doped zirconium-based MOF and is modified through phosphite to form a P-Br reaction layer, doped calcium ions are used for replacing part of zirconium-hydroxyl coordination sites, a non-catalytic metal center is formed, and the long glass fiber reinforced polyurethane composite material is obtained. According to the present invention, the aromatic halide coupling and cyclization reaction tendency of the bromination system during the combustion process is weakened, the material can efficiently capture the bromine free radical in the gas phase during the combustion, and the rapid chemical reaction is performed on the P-H bond in the phosphite group and the bromine free radical to generate the stable P-Br structure so as to improve the combustion stability of the material; the bromine free radicals are prevented from participating in generation of toxic substances such as hydrogen bromide or bromo-dioxin, the release amount of toxic flue gas and corrosive gas in the combustion process is remarkably reduced, the safety of the composite material in a fire scene is further improved, and the composite material can meet the strict standard of building door and window materials for low smoke and low toxicity and is suitable for popularization and application. And personnel escape and rescue safety can be effectively guaranteed.

The invention belongs to the technical field of material surface treatment, and particularly relates to a silicon dioxide polishing solution and a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing an oxidizing agent with water; a solution A is obtained; s2, mixing silicon dioxide silica sol, a dispersing agent, a suspending agent and the solution A to obtain a solution B; s3, mixing a pH regulator with the solution B, filtering, and standing to obtain a silicon dioxide polishing solution; the silicon dioxide polishing solution comprises the following components in 100 parts by weight: 1-15 parts of silicon dioxide silica sol; 4-10 parts of an oxidizing agent; 1-3 parts of a dispersant; 1-3 parts of a suspending agent; and the balance of water. The silicon dioxide polishing solution is uniform in particle size and good in dispersing performance; when the polishing solution is used for polishing, a reaction layer can be removed, no new damage is caused to the surface of a matrix, and the polishing solution has excellent polishing efficiency.

The invention provides a manufacturing method of a titanium / aluminum alloy heterogeneous interface interlocking strengthening structural material, which comprises the following steps of: directly forming a titanium alloy framework with a macroscopic sawtooth interface profile by adopting a selective laser melting (SLM) technology, and further performing laser surface micro-texture processing on a macroscopic sawtooth interface inclined surface, a micro-scale sawtooth texture arranged along an inclined plane is formed, and a'macroscopic sawtooth-micro texture 'double-scale interlocking interface is constructed. And then a titanium alloy component is placed in aluminum alloy powder, rapid densification of the aluminum alloy powder is achieved in a spark plasma sintering (SPS) device under the action of axial pressure and pulse current, metallurgical bonding with a titanium alloy interface is achieved, and the titanium / aluminum heterogeneous interlocking structure material with the high density and the thin interface reaction layer is obtained. Through the synergistic effect of macroscopic geometric interlocking and micro-scale mechanical occlusion, the interface tensile strength can be improved to 24.5 MPa from 14.1 MPa of direct combination.

The invention provides a quick-welding and high-reliability brazing film and a preparation method and a using method thereof, and belongs to the technical field of welding. According to the invention, a Ni / Al self-propagating reaction film is combined with a low-melting-point Sn weld-aid layer by relying on hot-pressing, electro-deposition and anodic oxidation composite process molding, and a multi-layer structure brazing film of a porous energetic film-Ni reaction layer-Sn anchoring layer is designed. According to the method, multi-point laser triggering and gradient pressure synergistic effect are combined, accurate regulation and control of multi-point triggering-reaction-welding can be achieved, the film is subjected to global uniform self-propagating exothermic reaction, rapid brazing connection is achieved, and an alloying connection interface with high bonding strength is formed. The process is simple, convenient and rapid, high in production efficiency and low in cost, the production period can be remarkably shortened, the problems that a traditional film interface is weak in bonding force, prone to layering and falling off and the like are effectively solved, welding faces of any shapes can be adapted, and a new technical approach is provided for efficient connection of complex components.

The application relates to a method for connecting sapphire and porous Si3N4 ceramic by using gradient ZBS microcrystalline glass solder, and relates to a method for connecting sapphire and porous Si3N4 ceramic by using microcrystalline glass solder. The application aims to solve the problem of thermal stress caused by the excessively large difference in thermal expansion coefficient between sapphire and porous Si3N4 ceramic base materials. The application successfully realizes the effective connection of sapphire and porous Si3N4 ceramic under the condition of argon by using gradient thermal expansion microcrystalline glass solder, forms a composite gradient thermal expansion intermediate layer, the whole joint is dense, the solder is well combined with the two side base materials, a reaction layer is formed at the sapphire interface to realize excellent connection, an infiltration layer is formed at the porous Si3N4 ceramic side to realize excellent connection, and the overall joint has relatively excellent mechanical properties. After being heated to 760 DEG C under the argon atmosphere and kept for 30 min, the room-temperature mechanical properties of the joint reach 20.5 MPa.

The application discloses a stress catalytic polishing method of polycrystalline ceramics, and steps are as follows: collecting surface profile data of a polycrystalline ceramic workpiece, and fitting and calculating a surface fractal dimension of the polycrystalline ceramic workpiece by using a power spectrum density method; according to the fractal dimension, a polishing disc surface similar to the surface fractal dimension of the workpiece is prepared, and then the polishing disc is subjected to texturing treatment, wherein a workpiece with a high fractal dimension corresponds to small-interval texturing, and a workpiece with a low fractal dimension corresponds to large-interval texturing; finally, the polycrystalline ceramic workpiece and the texturing polishing disc are relatively moved in a polishing liquid medium, and polishing processing is completed. The application effectively increases the effective contact area of the workpiece and the polishing disc by fractal design and laser texturing preparation, improves the stress catalytic chemical reaction efficiency, realizes efficient and uniform removal of a reaction layer, solves the problem of chemical reaction difficulty in the polycrystalline ceramic polishing process, and relieves the 'orange peel effect' of the surface, and is suitable for precision polishing of polycrystalline ceramics such as magnesium-aluminum spinel and aluminum nitride.