110 results about "Magnetic filtration" patented technology

The invention relates to the technical field of petrochemical engineering, in particular to a deep cracking and regeneration purification method of waste lubricating oil. The invention discloses a deep cracking and regeneration purification method of waste lubricating oil, which comprises the following steps: firstly, carrying out magnetic filtration on the waste lubricating oil to separate iron-based impurities, carrying out vacuum dehydration, adsorbing acidic substances by using modified diatomite and the like; secondly, cracking with a magnetic catalyst in a magnetically stabilized fluidized bed; then, carrying out counter-current extraction by using a gamma-valerolactone solution after magnetic separation; and finally, carrying out vacuum fractionation to obtain regenerated base oil. According to the method, impurities are thoroughly removed, the catalyst can be recycled, the solvent is easy to recover, solid waste can be utilized in a high-valued manner, and the yield of the base oil is high.

The invention discloses a super-lubricating and corrosion-resistant DLC (diamond-like carbon) protective coating and a preparation method thereof, and belongs to the technical field of protective coatings. The coating is prepared on a base body through magnetron sputtering and magnetic filtering arc ion plating processes, a multi-layer composite structure is formed by doping transition metal elements and non-metal elements, and the multi-layer composite structure comprises a cleaning modification layer, a gradient transition layer, a combination strengthening layer, a main functional layer and a surface lubricating layer. Through element doping, the internal stress of the DLC coating is effectively reduced, the surface lubricity is enhanced, the bonding strength of the coating and a matrix is improved, and meanwhile the high hardness and excellent wear resistance of the DLC coating are reserved. In addition, the preparation process is simple, is suitable for industrial production, and can be widely applied to surface protection in the fields of molds, automobiles, aerospace and the like.

The application discloses a workpiece surface modification layer and a preparation method thereof. The method comprises the following steps: S100, Cr metal is injected on the surface of a workpiece to be modified by using an ion injection technology to form an injection layer; S200, after the step S100, a CrAl film layer is deposited on the surface of the workpiece to be modified by using a technology combining ion injection and magnetron sputtering to form a composite metal transition layer; S300, after the step S200, a CrAlN film layer and a Cr film layer are deposited on the surface of the workpiece to be modified by using a magnetic filter cathode vacuum CrAl arc source and a Cr arc source to form a functional protective layer. The modification layer prepared by using the preparation method of the workpiece surface modification layer has strong adhesion with the surface of the workpiece, the film layer is uniform, the modification layer with corrosion resistance and wear resistance can be effectively prevented from falling off, and the service life of the workpiece is improved.

A sensor device 11 for a magnetic filter 10, converting an analogue signal therefrom to find and relay a filter status by interrogation of an electrically connected reference data library providing the correlation therebetween. A temperature sensor (50, fig 6) may be included. A user interface and LED display may be included. The filter may have an elongate magnetic core 12. The force sensing resistor may comprise a multilayer assembly made of at least two layers of flexible printed piezoelectric ink (31, 32a, 32b, 33, fig 4). The change in a force responsive sensor 25 may be measured. A time period remaining for saturation and / or the saturation point may be predicted via a counting process and / or a machine self-learning configuration. The system is designed to provide an indication of the status of contaminant capture in a magnetic filtration device with a sensor and data processing electronic components to calculate real-time a requirement for purging / cleaning of a filtration device prior to and / or at saturation.

The magnetic filtering type CBD coating method comprises the following steps: 1) connecting a group of arc sources A with 20-30A current for bottoming for 30-40 minutes to form a bottoming layer; 2) connecting a group of arc sources B with 80-100A current, and carrying out rough coating for 20-40 minutes to form a rough coating layer; 3) simultaneously connecting a group of arc sources B and a group of arc sources C with current, connecting a group of arc sources B with current of 80-100A, connecting a group of arc sources C with current of 300-350A, and simultaneously carrying out rough and semi-precise magnetic coating for 40-60 minutes to form rough and semi-precise magnetic coating layers; and (4) a group of arc sources D are communicated with 380-390 A current, precise magnetic filtering type coating is conducted, the coating time is 30-50 min, and a precise magnetic filtering type coating layer is formed, in the first step to the fourth step, the bias voltage ranges from 150 V to 180 V, the thickness of a base coat ranges from 1 micrometer to 2 micrometers, the thickness of a rough coating layer ranges from 1 micrometer to 1.5 micrometers, the thickness of a rough magnetic coating layer and the thickness of a semi-precise magnetic coating layer ranges from 0.8 micrometer to 1.2 micrometers, and the thickness of the precise magnetic filtering type coating layer ranges from 0.8 micrometer to 1 micrometer.

The application provides a slurry magnetic filtering device and a cleaning method. The magnetic adsorption device of the device comprises a plurality of magnetic adsorption cylinders, and the magnetic adsorption cylinder comprises a cylinder body, a magnetic roller and a scraper ring. The magnetic roller is arranged in the cylinder body, and the magnetic roller can slide reciprocatingly relative to the scraper ring. The magnetic roller comprises a roller body, a permanent magnet, a guide end wing and a permanent magnet driving mechanism. The roller body can slide reciprocatingly relative to the scraper ring arranged outside the magnetic roller. The permanent magnet is arranged in the roller body. The guide end wing is connected with the free end of the roller body. The permanent magnet driving mechanism is connected with the permanent magnet and is used for driving the permanent magnet to move towards the guide end wing or away from the guide end wing. The slurry magnetic filtering device can realize the technical effect that the permanent magnet is used as the magnetic adsorption system, has a relatively high effective magnetic adsorption surface area, and can better solve the cleaning problem.

The present invention discloses a coupled ion beam preparation device and method for an antigen-antigen oxygen polymer composite film. The device comprises a winding and unwinding system, a Hall ion source etching system, a MEVVA ion implantation system, a magnetically filtered cathode vacuum arc deposition system, and a high-power pulsed magnetron sputtering deposition system. The systems are connected via oxygen-free copper O-rings. The polymer film substrate is transported within the device, and the prepared composite film layer structure is shown in Figure 1. The composite film prepared using this technology exhibits excellent interfacial adhesion strength and film-substrate cooperative deformation capability, effectively alleviating AO erosion and degradation induced by cracking of the protective film caused by space debris collisions and thermal cycling, significantly improving the service life of polymer components.

The application discloses a method for realizing TGV high-conductivity copper-clad by using a magnetic filtering vacuum arc metal film, and specifically comprises the following steps: S1, ultrasonic cleaning is performed on a glass through-hole substrate; S2, sub-etching cleaning treatment and activation of a substrate surface are performed on the glass through-hole substrate under a vacuum environment; S3, a Ti film layer is deposited on the glass through-hole substrate after the treatment in S2 by using a magnetic filtering vacuum cathode arc method; and S4, a Cu film layer is deposited on the Ti film layer under a low vacuum environment. By using the method provided by the application, a Ti undercoat layer is first deposited, the problem of poor adhesion between Cu and a glass substrate is solved, then copper-clad deposition is performed, in addition, the glass substrate can be conductive after Ti plating, so that the bias voltage can be increased, the energy of Cu ions entering the hole is larger, the thickness of the film plated on the hole wall is improved, the adhesion is stronger, and the conductivity is improved.

The utility model discloses a magnetic filter baffle for a magnetic bar chain filter, which comprises a device body, and the device body comprises a magnetic filter plate, a brush long plate device, a brush short plate device and a brush device; the brush long plate devices are symmetrically mounted at the rear ends of the brush long plate devices, the brush short plate devices are mounted at the front ends of the magnetic filter plates, and the brush devices are clamped and fixed between the magnetic filter plates and the brush short plate devices; the brush short plate device comprises a first pressing block and a second pressing block, the first pressing block is located at the upper end of the second pressing block, a plurality of sets of locking bolt holes which are transversely distributed at equal intervals are formed in the surface of the first pressing block, and the connecting position of the first pressing block and the second pressing block is of an arc-shaped structure. According to the device, scraped iron sludge or oil sludge can be effectively prevented from falling into an equipment cavity, the cleanliness of the equipment is guaranteed, and the trouble of cleaning the equipment by maintainers is reduced.

This invention discloses a remote real-time control system for ceramic membrane magnetic filtration based on the Internet of Things (IoT). The system comprises a sensing layer, an edge computing layer, a cloud control layer, a user interaction layer, and a modular access unit. The sensing layer, centered on a gradient field permanent magnet magnetic filtration module, integrates a Hall sensor array, an electromagnetic flowmeter, and a temperature sensor to collect key data such as magnetic saturation index, syrup flow rate, and liquid temperature in real time, achieving comprehensive perception of the ferromagnetic impurity capture status and raw material parameters. The gradient field permanent magnet magnetic filtration module is connected in series with the syrup delivery pipeline and includes a multi-stage detachable magnetic rod assembly, a Hall sensor array, a servo rotating sleeve, and a slag discharge channel. Compared to traditional iron removal equipment, this IoT-based remote real-time control system for ceramic membrane magnetic filtration is specifically designed for the characteristics of high-sugar, high-acid liquids. The gradient field magnetic circuit improves the capture efficiency, stably controlling the iron content below 0.3 ppm, effectively preventing product blackening, sedimentation, and a metallic taste.

This invention relates to the field of CNC metal cutting device technology, specifically a CNC wire cutting device, including a machine tool body, a worktable, a wire winding drum, and guide wheels. The machine tool body is equipped with a conductive structure for conducting molybdenum wire. The conductive structure includes a conductive component and a positioning component. The conductive component enables the molybdenum wire to conduct electricity, and the positioning component controls the rotation angle of the conductive block each time. A fine filtration structure and a magnetic filtration structure include a magnetic separator and an installation component. The magnetic separator uses two chambers to magnetically attract the working fluid in a meandering manner, and the installation component allows for the installation and removal of the magnetic separator. The positioning component in the conductive structure enables precise 90° rotation positioning of the conductive block each time. The workpiece clamping table adopts a combination design of sliding rail and positioning fixtures, allowing for rapid adjustment of the clamping position. The working fluid undergoes three stages of treatment: primary filtration, meandering magnetic attraction, and fine filtration. Primary filtration intercepts large particulate impurities, and the meandering flow channel extends the contact time between the working fluid and the magnetic plate, improving the adsorption rate of metal oxides and preventing secondary shedding.

The utility model relates to the field of air purification, in particular to an air purification device for a subway station based on electromagnetic adsorption, which comprises a reverse fan unit, a coarse filter unit and an electromagnetic filter unit, and the electromagnetic filter unit is arranged between the reverse fan unit and the coarse filter unit. The electromagnetic filter unit comprises a filter element and a coil, the filter element comprises a filter element framework and a filter screen, and the filter screen is made of a soft magnetic material. According to the utility model, the electromagnetic filter unit is arranged, the electromagnetic effect principle is utilized, and the coil is electrified, so that a high-gradient magnetic field is generated in the filter element, and ferromagnetic particles in the air are adsorbed by the filter element, so that high-concentration iron-containing particles in the air in the subway station can be removed in a targeted manner, and the subway air quality is remarkably improved; and the body health of passengers and subway workers is protected.

The present disclosure relates to a magnetic filter apparatus (1) for separating magnetic particles (10a) from liquid (10b) comprising a plurality of rods (2), a driving means (3) arranged to drive each of the plurality of rods (2) in a loop and a removal device (4) arranged to remove captured magnetic particles from each rod (2). Furthermore, the wherein the loop defines a trajectory having a lower portion (u1) and an upper portion (u2), wherein the lower portion (u1) is arranged to be immersed in liquid (10b), wherein the driving means (3) is arranged to drive the rods (2) to enable each rod (2) to, when being in the lower portion (u1), be immersed in said liquid (10b) for an initial time-period to capture said magnetic particles (10a).

The utility model provides a demagnetizing and filtering device which comprises a treatment chamber, and the treatment chamber comprises an inlet, an outlet and a plurality of working cavities which are distributed in the circulation direction between the inlet and the outlet and communicate with one another; the magnetic assemblies are correspondingly arranged in the operation cavities; and the filter screens are correspondingly arranged in the operation cavities and are distributed in the circulation direction. The demagnetizing and filtering device provided by the utility model can effectively remove impurities in the liquid and improve the treatment effect and the treatment efficiency of the liquid.

The utility model discloses an acetic ester solvent recycling system, relates to the field of acetic ester solvent recycling, and aims to solve the technical problems that in the prior art, an existing acetic ester solvent is generally recycled by a distillation tower after being used, but a filtering mechanism is not arranged at the front end of the existing distillation tower, so that the cost is low. The problem that the internal structure of the distillation tower is damaged by residual metal scraps in the solvent is solved. A plurality of supporting rods are arranged at the upper end of the interior of the filtering device at equal intervals in an array mode, an electromagnetic iron rod is arranged at the upper end of each supporting rod, bevel guide plates are fixedly connected to the front end and the rear end of the lower end of the interior of the filtering device, and the lower ends of the two bevel guide plates are jointly and fixedly connected with a semicircular filtering net; by arranging the electromagnetic iron rod, the semicircular filter screen and the conical filter screen, separation of metal impurities in a solvent is achieved, and the problem that equipment is damaged by metal scraps due to the fact that the front end of a traditional distillation tower is free of magnetic filtration is solved.

The present application relates to a kind of cutting fluid filtering device and numerical control machine tool containing the device, the cutting fluid filtering device includes: collection pool, the lower end of collection pool is fixed with adapter, the lower end of adapter is fixed with electromagnetic filtering mechanism, the right side upper portion of electromagnetic filtering mechanism is connected with conveying flow channel, the right side port of conveying flow channel is connected with circulating pump, the upper end of circulating pump is connected with liquid outlet flow channel, the present application adopts electromagnetic and physical filtration combined mode, can effectively remove large particle iron filings and small oil oxidation product in cutting fluid, and through innovative electromagnetic filtration and fluid dynamics design, realizes the efficient, fast and continuous separation of oil oxidation product and iron filings in cutting fluid, significantly improve the cleanliness, stability and service life of cutting fluid, while reducing maintenance cost and operation complexity, to provide more efficient, stable and economic solution for cutting processing.

This invention relates to the field of filter cleaning technology, and in particular to a magnetic filter desludge removal device, comprising a first mounting plate and a second mounting plate; a plurality of magnetic filters are fixedly connected between the first mounting plate and the second mounting plate; a forward and reverse motor is fixedly connected to the outer side of the first mounting plate; a transmission assembly is fixedly connected to the output shaft of the forward and reverse motor; a drive assembly is rotatably connected between the first mounting plate and the second mounting plate; the drive assembly is fixedly connected to the transmission assembly; a movable slide rail is threaded onto the drive assembly; a scraper is slidably connected to the movable slide rail; the scraper is in contact with the surface of the magnetic filter and is configured in a rake-like rotation; a blowing assembly is provided above both the first mounting plate and the second mounting plate, and the forward and reverse motor drives the transmission assembly to rotate, the transmission assembly drives the drive assembly to move, and the drive assembly moves the scraper on the magnetic filter through the movable slide rail to remove the sludge.

This invention discloses a cutting fluid circulation, purification, and recovery device for mold parts in the field of cutting fluid treatment technology. It includes a multi-layer magnetic filtration mechanism, comprising a housing with an inlet. Several sets of magnetic filter plates are arranged from top to bottom within the housing, and a cleaning section is provided above each magnetic filter plate. By employing the synergistic cooperation of multi-layer magnetic filtration and the cleaning section, this invention effectively solves the drawbacks of existing single-stage filtration methods, such as limited accuracy, easy clogging, and the need for frequent manual cleaning. The overall structure is compact and easy to maintain, making it suitable for centralized circulation and recovery of cutting fluid in small machining centers, mold workshops, and other similar settings. This improves processing efficiency while reducing labor intensity and overall operating costs.

The application provides a preparation method of a 5G ceramic dielectric filter material, and the method comprises the following steps: S1, performing sand blasting or polishing treatment on the surface of a ceramic base, then immersing the treated ceramic base into an organic solvent for ultrasonic cleaning, and drying the cleaned ceramic base; S2, by means of high-energy pulse ion implantation, using a first metal target, implanting first metal ions onto the surface of the ceramic base treated in step S1 to form a transition layer; S3, by means of magnetic filter cathode vacuum arc deposition, using a second metal target, depositing a second metal on the transition layer prepared in step S2 to form a connecting layer; S4, by means of multi-arc ion plating, using a third metal target, depositing a third metal on the connecting layer prepared in step S3 to form a surface metal layer, and obtaining a filter film layer material. The preparation method of the film layer material obtains a high-metalized silver layer with high compactness, low roughness and uniform thickness, so that the bonding force between the base ceramic layer and the metal film silver layer is good, and the insertion loss is low.

The invention discloses a demagnetizing and filtering trolley, and relates to the technical field of circulating water filtration, the demagnetizing and filtering trolley comprises a trolley body and a demagnetizing device, ball valves are symmetrically arranged right above the trolley body, the output ends of the ball valves are connected with injection pipe fittings, the outer sides of the injection pipe fittings are connected with a supporting frame, the supporting frame is arranged right above the trolley body, and the demagnetizing device is arranged on the trolley body. A circulation mechanism is arranged over the vehicle body and drives liquid to flow through the demagnetizer, and a high-intensity magnetic field environment is constructed through a built-in magnet assembly of the circulation mechanism. When slag needs to be discharged, power is cut off to demagnetize the magnet assembly, and under the action of fluid pressure or gravity, metal particles adsorbed on the surface of the magnet flow to the blow-down valve along with liquid to complete impurity emptying operation. The circulating mechanism drives the liquid to continuously flow through the demagnetizer to form a circulating flow path, so that ferromagnetic impurities in the liquid have more opportunities to be in contact with a high-intensity magnetic field area, the demagnetizing effect is further improved, and it is ensured that the ferromagnetic impurities in the liquid are fully adsorbed.

The present invention discloses a high entropy oxide thin film negative electrode material and its preparation method and application. A high entropy oxide thin film is deposited on a copper foil substrate in one step using a magnetic filtered cathode vacuum arc method. The method specifically comprises the following steps: the substrate is placed in an ethanol solution for cleaning; the vacuum chamber is then placed in a vacuum chamber for evacuation; the substrate is sputtered and cleaned using argon gas under a negative bias of 300 to 600 V; a high entropy oxide thin film is deposited using a magnetic filtered cathode vacuum arc, and the thin film is deposited under arc current of 50 to 200 A, a positive bias of 20 to 40 V, a negative bias of 50 to 300 V, and an oxygen flow rate of 5 to 10 sccm. The deposition time is 0.5 to 2 hours. The present invention realizes the fine film formation of multiple metal oxides in one step at room temperature through the interaction between energetic ions and the surface / subsurface of a metal target. Compared with the method based on chemical synthesis, the ion technique can achieve wide-range regulation of oxide types, structures, and properties, and has better industrial application prospects.

The present application relates to a coating for surface modification of metal materials, in particular to a sand-proof and fatigue-resistant integrated coating for surface strengthening of aluminum alloy and a preparation method. The technical problem that the existing coating structure for the surface of aluminum alloy cannot simultaneously consider sand-proof and fatigue-resistant performance is solved. The coating comprises a plasma etching layer, a metal ion implantation layer, a Ti metal transition layer and a TiN / Ti nano cycle layer which are sequentially stacked on the surface of the substrate in the thickness direction; the TiN / Ti nano cycle layer comprises n cycle layers; each cycle layer comprises a TiN ceramic layer and a Ti metal layer; in the plurality of cycle layers, the thickness of the Ti metal layer decreases layer by layer in the direction from the substrate to the outer surface of the coating, and the thickness of the TiN ceramic layer increases layer by layer in the direction from the substrate to the outer surface of the coating; the Ti metal transition layer and the TiN / Ti nano cycle layer are prepared by magnetic filter cathode vacuum arc sputtering; Ti ion sputtering layers are interposed in the Ti metal transition layer and the TiN / Ti nano cycle layer; and the preparation method of the coating is also provided.

The application relates to a device for improving the deposition rate of a magnetic filtering arc ion plating, which comprises a filter, the filter is composed of multiple head-to-tail connected pipe sections, the pipe sections are straight pipe sections, and the number of the pipe sections is greater than or equal to 3. The above scheme provided by the application can effectively filter out micro-particles in plasma by changing the structure of the filter, is suitable for filtering and purifying plasma of various metal, alloy and graphite cathode target materials, and the resistance of the plasma in the magnetic filter is reduced when the plasma travels in the magnetic filter, so that the deposition rate is improved.

This system consists of two walls made of upvc material in the inner wall and the outer wall made of iron The upvc wall is placed inside the metal wall. A part called rotating cylinder, which contains a number of neodymium magnets with appropriate power inside the cylinder, and the task of this cylinder is to attract metal particles in the system, and around the axis of the small wall, we mean between two walls, another number of powerful magnets in the form of It is placed in a semi-circle and at an appropriate distance from each other, and these series of magnets are placed from the negative pole side to direct the particles to the rotating cylinder that has positive pole magnets. The cylinder, which has a Mardon shaft to rotate, and when cleaning the track, an electric motor installed on the assembly rotates the rotating cylinder, and the operator can clean the side of the particle receiver, which is the so-called garbage collector. A camera is embedded in the system to monitor this collection online. At the end and at the beginning of this set, two flanges are placed to connect the system to the pipeline, and in this way, it is easy to install and operate. With the installation of the system, whenever it is time to clean the pipeline, it is enough to turn off the system so that there is no gas in the line, then the operator rotates the rotating cylinder by means of an electric motor, opens the chamber door, and the metal dirt and metal particles that are attracted to the rotating cylinder to clear In order to use this evacuation system, due to its safe operation, it is not necessary to spend a lot of time to evacuate the particles, and it performs the evacuation of the particles in a very short period of time, and by turning off the refinery unit for 10 to 20 minutes, emergency evacuation operations are performed. does

This invention discloses a metal solder powder processing and purification device with magnetic filtration function, relating to the field of magnetic filtration purification technology. It includes a base, with a receiving mechanism at the rear of the base's top for collecting non-magnetic metal solder powder and magnetic metal impurities. Above the receiving mechanism is a magnetic filtration mechanism for separating the non-magnetic metal solder powder and magnetic metal impurities. Above the magnetic filtration mechanism is a feeding mechanism for conveying unscreened metal solder powder. A driving mechanism for rotating the magnetic filtration mechanism is located at the front end of the base. A column is fixedly installed at the front of the base's top, and three support plates for fixing the feeding mechanism, driving mechanism, and magnetic filtration mechanism are fixedly installed sequentially from top to bottom on one side of the column. This invention avoids internal blockage caused by the accumulation of magnetic metal impurities during the purification process of metal solder powder, thus facilitating the purification of the metal solder powder.

The application provides a flexible high-entropy alloy coating and a preparation method and application thereof, and belongs to the technical field of high-entropy alloys. The application changes the spatial layout and potential distribution of a vacuum chamber through magnetic filter cathode vacuum arc deposition, improves the plasma density, makes the element composition and content of the high-entropy alloy adjustable, and makes the prepared high-entropy coating have good tribology, corrosion and oxidation resistance. The ionization rate of the deposited particles after magnetic filtering is close to 100%, there are no large particles, the formed film is dense, smooth and good in corrosion resistance, and the film is well combined with the body. The application can prepare a variety of element films, can control the film thickness to be in the order of nanometers to obtain a nanometer multilayer film, and combines the design of a unary metal coating, a binary metal coating, a quaternary metal coating and a high-entropy coating, thereby avoiding the problems that the high-entropy coating prepared by traditional technology has large internal stress and is difficult to realize flexibility.

This utility model relates to the field of compound seasoning sauce production technology, and in particular to a magnetic filter for compound seasoning sauce production. It includes a supporting base plate, a supporting box fixedly connected to the upper end of the supporting base plate, a supporting plate fixedly connected to the upper end of the supporting box, a protective component sleeved on the outer surface of the supporting plate, a limiting block fixedly connected to the front of the upper end of the supporting plate, a magnetic filter body fixedly connected to the upper end of the supporting plate, and supporting rods fixedly connected to the left and right sides of the upper end of the supporting plate. The magnetic filter body is located between the two supporting rods. The protective component includes a protective frame, a fixing block fixedly connected to the front of the upper end of the protective frame, and a baffle inserted through the front of the upper end of the protective frame, the baffle being located in front of the fixing block. This utility model's magnetic filter for compound seasoning sauce production, through its protective component, can protect the magnetic filter during use.

The application discloses a method for preparing gradient multistage multilayer carbon film on the surface of fluoroether rubber by Cr / Ti co-doping, wherein the substrate is washed, dried, and then placed into a magnetron sputtering cavity; Ar gas is introduced to clean the substrate under high vacuum condition; and then modified metal micro-doped carbon film is obtained by adopting cathode arc magnetic filtering technology. The obtained co-doped carbon film obviously improves the friction performance, the hydrogenated amorphous carbon film composition in the film is increased, and meanwhile, the film itself density and hardness are maintained; the cathode arc magnetic filtering technology makes the doping elements uniformly disperse in the film, so that the film performance is improved by a small amount of doping elements; the order degree of the friction interface of the film is obviously improved during the friction process, the film has low friction coefficient and low wear rate, and the tribological performance of the film is improved.

The utility model relates to the technical field of smoke detection, and discloses an air-breathing smoke detection magnetic external filter which comprises an outer shell, an air inlet and an air outlet are formed in opposite faces of the side wall of the outer shell respectively, the air outlet is connected with the air inlet end of an air-breathing smoke detector in a sealed mode, and a cover plate is detachably arranged at the top of the outer shell; the magnetic filtering assembly is detachably arranged in the outer shell and communicates with the air inlet through an air inlet pipe, the upper end of the magnetic filtering assembly makes close contact with the cover plate, the magnetic filtering assembly is formed by stacking multiple layers of filter screens, the end of the air inlet pipe extends into the inner side of the inner layer filter screen, the adjacent filter screens are supported through a plurality of spacing columns, and the spacing columns have magnetism; the magnetic filter assembly further comprises a strong magnet arranged below the multiple layers of filter screens; the electrostatic adsorption assembly is arranged between the magnetic filtering assembly and the air outlet and is in sealed connection with the air outlet. The utility model has the advantages that the magnetic filtering structure is added, so that the filtering part can remove magnetic powder.