41results about How to "Avoid ablative damage" patented technology

The invention discloses a precise micro-forming device and a method thereof based on a laser continuous stamping plasticine technology. The device comprises a laser loading system, a plastic forming system and a computer control system. The laser loading system comprises a nanosecond laser, a reflection mirror and a focusing lens. The plastic forming system comprises a sample system, a clamp body, a three-dimensional moving platform and a base. The computer control system comprises a three-dimensional moving platform controller, a laser controller and a computer. According to the device and the method, plasticine is used for transmitting impact force, in a multi-time impact process, the plasticine and a workpiece are attached together gradually, stress on the workpiece is even, scratching cannot happen, surface quality of the workpiece is improved, and meanwhile according to the characteristic that the plasticine deforms in an plastic mode after being stressed, the workpiece and a micro mould can be attached with each other, rebounding of the workpiece is avoided, and forming precision of the workpiece is guaranteed.

The invention discloses an ablation-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite as well as a preparation method and an application thereof. The preparation method of the ablation-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite comprises the following steps: S1, preparing Si-B-C-N-Zr powder; S2, performing surface modification treatment on fiber to obtain modifiedfiber; S3, mixing the modified fiber with the Si-B-C-N-Zr powder to obtain composite powder; S4, performing hot pressing and sintering on the composite powder to prepare the ablation-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite. The prepared ablative-resistant fiber toughened Si-B-C-N-Zr ceramic matrix composite has good microstructure and higher fracture toughness, mechanical property and ablative resistance, used raw materials are widely sourced and low in price, the preparation process is simple and mature, the preparation period is short, all the steps can be realized with existing technologies and equipment, and the composite is suitable for industrial production.

The invention discloses a laser shock high molecular polymer indirect micro-forming method and a dedicated device thereof. A laser beam goes through an optical medium in a forming system and is exposed to an absorption coating film, so that a part of the absorption coating film is ablated to generate high-temperature high-pressure plasmas; the plasmas further absorb laser energy and then expand and explode; and the exploding plasmas expand towards the absorption coating film to generate a GPa-level impact pressure on the absorption coating film, resulting in plastic deformation of the absorption coating film. A high molecular polymer deforms towards a target work piece which is arranged at the lower part of the polymer under constraints of the impact pressure of the absorption coating film and the cavity of the high molecular polymer, resulting in plastic deformation of the target work piece. The method prevents ablative degradation or etching of the work piece surface and ensures precision forming of the work piece in the micro-mould.

The invention relates to a method for cleaning a laser film. The method specifically comprises the steps that a cotton swab dipped with acetone is used for slightly wiping the surface of the laser film, the wiped laser film is put in a first cleaning tank, alkaline solution is filled into the first cleaning tank to clean a sample, and the solution temperature is the room temperature; the volume ratio of the alkaline solution is that NH4OH: H2O2: H2O equals to 1: 10: 50; the obtained solution is respectively subjected to ultrasound for 2-4 minutes at the frequencies of 120 kilohertz-180 kilohertz and 200 kilohertz-300 kilohertz; the obtained sample is put in a second cleaning tank and is rinsed through deionized water, and the temperature of the deionized water is the room temperature; the sample is put in a third cleaning tank 3, the deionized water is added into the third cleaning tank, and the sample is respectively subjected to ultrasound for 3-6 minutes at the frequencies of 120 kilohertz-180 kilohertz and 200 kilohertz-300 kilohertz; and the sample is taken out, repeatedly cleaned and dried to obtains the required product. The method has the advantages that the high cleaning efficiency is realized, organic pollutants and contamination particles on the surface are effectively removed, meanwhile, the laser film cannot be physically damaged, the film is prevented from being eroded and damaged due to the particles which are absorbed to the surface of the film when the film is used in a high-power laser system, and the laser film is enabled to have high damage threshold when being used in the high-power laser system.

The invention provides a method for preparing an explosive composite rod based on water pressure in a local vacuum environment. The method comprises the steps that a to-be-composited rod, a to-be-composited pipe, a small-size pvc pipe and a large-size pvc pipe are coaxially arranged from inside to outside; the two ends of a gap between the to-be-composited rod and the to-be-composited pipe are sealed by sealing strips, vacuumizing is carried out, and a vacuum gap environment is constructed; space between the small-size pvc pipe and the large-size pvc pipe is filled with an explosive and a detonator to form an explosive device; space between the to-be-composited pipe and the explosive device is filled with water, and a water environment is constructed; and the explosive device is detonated to enable the to-be-composited pipe and the to-be-composited rod to be welded and combined, and the high-quality explosive composite rod is obtained. According to the method for preparing the explosive composite rod based on the water pressure in the local vacuum environment, the problem that high-quality machining of a thin-wall material cannot be achieved through a traditional method is effectively solved; and the phenomenon that large-area melting of the bonding interface of composite materials is caused by an air layer which is not emptied in a gap is eradicated, and size selection of to-be-composited materials is freer.

The invention provides a method for preparing high-efficiency explosion composite pipes and rods based on water pressure in a local vacuum environment. The method comprises the following steps: coaxially arranging a to-be-composited rod 1, a to-be-composited pipe 2, small-size and large-size pvc pipes and to-be-composited pipes 4 and 5; enabling the position between the small-size pvc pipe and the large-size pvc pipe to be filled with explosives and detonators to form an explosive device; sealing and vacuumizing the two ends of gaps between the to-be-composited rod 1 and the to-be-composited pipe 2 and between the to-be-composited pipes 4 and 5 by using sealing strips to construct a vacuum gap environment; injecting water between the to-be-composited pipes and the explosive device to construct a water environment; and starting the explosive device to weld and combine the to-be-composited materials to obtain the explosion composite pipes and composite rods. According to the method for preparing the explosion composite pipes and rods, the phenomenon that a composite material bonding interface is melted in a large area due to an air layer which is not emptied in the gaps is avoided, the utilization rate of the explosives is increased, and the difficulty that a thin-wall material cannot be machined in a high-quality manner through a traditional method is effectively solved.

The invention discloses an intelligent shell breaking control system for aluminum electrolysis based on a triode self-excited oscillating circuit. The intelligent shell breaking control system is mainly composed of an air cylinder control module, a microprocessor, a power module, a signal processing module, a shell breaking signal output module, a feedback signal processing module, a tank control machine signal input interface and a sensor set, wherein the power module, the signal processing module, the shell breaking signal output module and the feedback signal processing module are connected with the microprocessor, the tank control machine signal input interface is connected with the signal processing module, and the sensor set is connected with the feedback signal processing module. The intelligent shell breaking control system is characterized in that a triode self-excited oscillating module is connected between the shell breaking signal output module and the air cylinder control module in series, and the triode self-excited oscillating module is composed of an oscillating circuit and a compensation circuit connected with the oscillating circuit. According to the intelligent shell breaking control system for aluminum electrolysis, an air cylinder can be controlled more accurately through the triode self-excited oscillating module, and the phenomenon that a hammer is immersed in an electrolyte for a long time, and consequently a hourglass head is generated is avoided.

The invention discloses a gasifying agent and water mixing atomizing nozzle and an atomizing method thereof. The atomizing nozzle comprises a nozzle body with a central through hole, a central spray pipe is arranged in the central through hole, the tail end of the central spray pipe is contracted into a conical spray port, an annulus channel is arranged between the nozzle body and the central spray pipe, the central spray pipe is surrounded by the annulus channel, a guide sleeve is connected with the tail end of the annulus channel, and a mixing chamber is connected with the tail end of the guide sleeve. According to the gasifying agent and water mixing atomizing nozzle and the atomizing method thereof, by enhancing the water atomization effect and increasing the specific surface area of liquid drop, the phase interface area with coal heat and mass transfer is increased, and the combustion and gasification reaction efficiency is improved; and since the gasification agent and atomized water are simultaneously sprayed into the coal seam combustion and gasification reaction working face, the direct contact reaction with the gasification working face is achieved, the water injection volume is reduced, and the thermal efficiency is improved.

The invention provides a method for preparing a thin composite layer explosive welding composite board in a vacuum environment, which comprises the following steps of: putting an explosive welding device in a vacuum device through a cutting board, arranging a base plate, a plurality of support columns and a thin composite board from bottom to top, and tightly attaching a buffer plate to the upper edge of the thin composite board. Explosive is laid on the buffer plate, a detonator is connected in the buffer plate, and a detonating cord is connected outside the vacuum device through the vacuum device. And the explosive welding device is detonated in the vacuum environment, the thin composite plate is welded to the base plate through the buffer plate under the high pressure of explosive explosion, and preparation of the composite plate is completed. Compared with a traditional preparation method, the method for preparing the composite plate through thin composite layer explosive welding is higher in success rate, and ablation damage to the surface of the thin composite plate caused by direct contact of explosives and the thin composite plate can be effectively prevented; the conditions that bulges are caused by air, brittle intermetallic compounds are generated, the bonding strength is low and even welding fails are avoided; the detonation velocity of the explosive is selected more freely, and the operability is higher; and the influence of vibration and noise on the surrounding environment can be obviously reduced.

The invention discloses a propelling method and a propelling device for liquid-phase carbon dioxide phase change based on high-voltage discharge. The method comprises the following steps that carbon dioxide is contained in a heat insulation container in a liquid phase form, high-voltage discharge is carried out in the liquid-phase carbon dioxide to generate plasma to be instantly heated so that the carbon dioxide can be converted into a gas phase from a liquid phase, and carbon dioxide gas obtained after phase change is jetted by a preset jetting amount in the preset direction to obtain thrust.

The invention provides a control method and device which are applied to a vehicle with a head-up display, the head-up display comprises a lens and a display screen which are connected with each other,and the method comprises the steps that when the vehicle is in a remote state, the working mode of the head-up display is obtained; and under the condition that the working mode is a first working mode, the lens is controlled to be in an initial state and the display screen is controlled to be in a screen-off state. When the vehicle is in the remote state, the display screen of the head-up display of the vehicle is controlled to be turned off, electric energy consumption can be reduced, and the lenses are in the initial state, so that external light cannot be gathered on the display screen ofthe head-up display; and the situation that the liquid crystal screen is ablated and damaged due to over-high temperature of the display screen caused by external light is avoided.

The invention relates to electric power auxiliary equipment, in particular to neutral point vacuum gap grounding complete equipment for a 110kV transformer, and the equipment comprises a machine base, an isolating switch, a lightning arrester, a vacuum gap grounding module, a common grounding copper bar, a grounding terminal, a conductive copper bar, a first current transformer and a second current transformer. The isolation switch, the lightning arrester and the vacuum gap grounding module are connected with the conductive copper bar, the transformer neutral point is connected with the conductive copper bar, the isolation switch, the lightning arrester and the vacuum gap grounding module are connected with the common grounding copper bar, the common grounding copper bar is connected with the grounding terminal, the grounding terminal is grounded, and the first current transformer is coupled with the vacuum gap grounding module; and the second current transformer is coupled with the common grounding copper bar. The invention has the substantive effects of overcoming the influence of climatic environment on gap breakdown precision, improving the accuracy of neutral point overvoltage protection, improving the safety and reliability of neutral point grounding equipment, being free of field alignment and maintenance, and saving the installation space.

The invention provides a method for preparing an explosive composite pipe rod in a vacuum environment. The method comprises the following steps: coaxially arranging a metal bar 1, a metal pipe 2, a pvc pipe 5-1, a pvc pipe 5-2, a metal pipe 3 and a metal pipe 4 from inside to outside; explosive cladding explosives and detonators are filled between the pvc pipe 5-1 and the pvc pipe 5-2 to form an explosive device; filling water between the to-be-compounded pipe and the explosive device to construct a water environment; placing the to-be-compounded material, the explosive device and the water environment into a vacuum tank integrally, and vacuumizing to construct a vacuum environment; and detonating the explosive device to firmly weld the metal material to obtain two groups of high-quality explosive composite pipes and composite rods. According to the preparation method of the explosive composite pipe rod, the large-area melting phenomenon, caused by adiabatic compression of an air layer, of a material bonding surface in the welding process is eliminated, and a new thought is provided for welding work in special operation scenes such as the space environment and the underwater environment; the difficulty that high-quality machining of thin-wall materials cannot be achieved through a traditional method is effectively solved.