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32results about How to "Strong ablation resistance" patented technology
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Dual-rotational-flow inspirator
ActiveCN103867340AStrong interactionGood atomization performanceRocket engine plantsHollow cylinderEngineering
The invention provides a dual-rotational-flow inspirator, which comprises a top cover, a nozzle, an upper bottom, a middle bottom, a gas whirlcone and an inspirator cavity, wherein the inspirator cavity is a barrel-shaped hollow cylinder; a fuel cavity is formed between the top cover and the upper bottom of the inspirator; a gas oxidizing agent cavity is formed between the upper bottom and the middle bottom of the inspirator; a water cavity is formed between the middle bottom of the inspirator and the base of the inspirator; an inner nozzle passes through mounting holes in the upper bottom, the middle bottom and the inspirator cavity and is fixedly arranged on the upper bottom via a thread; the gas whirlcone is installed on the nozzle by a thread; water nozzles are water holes evenly distributed on the circumstance on the base of the inspirator. The inspirator provided by the invention has the characteristics of simple structure, low cost, good atomization performance and stable flame.
Owner:NAT UNIV OF DEFENSE TECH
Multi-element composite reinforced molybdenum alloy and preparation method thereof
The invention relates to a preparation method of a multi-element composite reinforced molybdenum alloy. The preparation method sequentially comprises the following steps that the Mo source, the Ti source, the Zr source, the C source, the Hf source and the Re source are weighed according to a certain weight ratio, the raw materials are prepared and mixed to obtain the uniform molybdenum alloy powder; the molybdenum alloy powder is placed in a mold cavity of a mold and is subjected to compression forming treatment to obtain a forming blank; high-temperature sintering treatment on the formed blank is carried out under vacuum to obtain a sintered blank; forging or rolling deformation processing is carried out on the sintered blank to obtain a forged blank or a rolled blank; and annealing heattreatment on the forged blank or the rolled blank is carried out to obtain the molybdenum alloy plate or a rod material. According to the preparation method, the steps and the process conditions are reasonable in design and good in using effect, the prepared molybdenum alloy material has excellent performance, the tensile strength Ra is greater than or equal to 200 MPa at a high temperature of 1600 DEG C, the percentage elongation after fracture is larger than or equal to 20%, and the oxygen content is less than or equal to 100 ppm.
Owner:安泰天龙钨钼科技有限公司 +1
Remote high-voltage pulse nanosecond switch applying insulating oil
InactiveCN102163805AHigh voltageIncrease distanceSpark gaps with auxillary triggeringTransmission systemsOrganic glassRadio signal
The invention relates to a remote high-voltage pulse nanosecond switch applying insulating oil. The remote high-voltage pulse nanosecond switch comprises an organic glass shell, an electrode disk, a cathode, an anode, a triggering electrode, an electromagnet, a refined rapeseed oil serving as an insulating medium and a remote triggering and controlling system. The cathode, the anode and the electrode disk are tightly fixed together through bolts; the head of an electromagnet shell is provided with a thread and is connected with the organic glass shell of the switch; the tail end of an electromagnet core is connected with the triggering electrode through an organic glass rod; and the remote triggering and controlling system consists of a wireless remote controller, a receiving antenna, a high-frequency receiving module packaged in a metallic shield shell, a decoding integrated circuit (IC), a driving circuit, a relay and a storage battery. According to the remote high-voltage pulse nanosecond switch, radio signals emitted from the controller are received by the antenna, transmitted to the high-frequency receiving module and decoded by the decoding IC, the relay is driven by the driving circuit to energize the electromagnet and push the triggering electrode to move towards a main electrode, so that quick high voltage discharging is safely, reliably and conveniently realized, and a pulse wave form of which the rising edge is a nanosecond level is formed.
Owner:PLA UNIV OF SCI & TECH
Preparation method of ablation-resistant quartz fiber reinforced silicon oxide based composite material
The invention relates to a preparation method of an ablation-resistant quartz fiber reinforced silicon oxide based composite material. According to the preparation method, Al doped high purity quartzfiber with higher heat resistant grade is adopted to replace common quartz fiber in weaving of a fabric prefab; ethyl orthosilicate dipping and acid steaming are adopted to increase composite densityto be higher than 2.0g / cm<3>; and at last at 850 to 1050 DEG C, long term of vacuum heat processing is carried out. The ethyl orthosilicate dipping and acid steaming are adopted to solve a problem inthe prior art that further increasing of composite material density is impossible to realize through conventional circulation dipping of silica sol. The preparation method is capable of increasing ablation resistance of the composite material at typical ablation states at a temperature higher than 2000 DEG C by more than 50%, and at the same time, the tensile strength is maintained to be higher than 30MPa. The preparation method is high in operationality, and is suitable to be used in the field of quartz fiber reinforced silicon oxide based composite material engineering preparation.
Owner:AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
Metal-ceramic concrete with high impact resistance at ultra-high temperature
The invention discloses a metal ceramic concrete with high impact resistance at an ultra-high temperature. The metal ceramic concrete per cubic meter contains 400-500 kg of a cementing material, 950-1150 kg of metal ceramic coarse aggregate, 660-715 kg of quartz sand or metal ceramic fine aggregate, 160-180 kg of water, 7-9 kg of a polycarboxylate superplasticizer, 0.5-2 kg of nano-powder, and 3-10 kg of high-strength fiber with high temperature resistance. The metal ceramic concrete disclosed by the invention takes metal ceramic as aggregate, and is provided with a large amount of nano-silicon powder as a mineral admixture, the polycarboxylate superplasticizer and the high-strength fiber with high temperature resistance as an internal structure of the molded material. The metal ceramic concrete has great application prospects in the fields of bridge structures, high-rise buildings, military defense and protection, nuclear power engineering, aerospace engineering and the like.
Owner:TAIYUAN UNIV OF TECH
Anti-lightning protection gap for traction power supply system of electrified railway
InactiveCN101741017AStrong ablation resistanceMeet matching requirementsSpark gap detailsHigh-tension/heavy-dress switchesEngineeringTraction power supply
The invention discloses an anti-lightning protection gap for a traction power supply system of an electrified railway, comprising a suspension insulator. An upper metal fitting of the suspension insulator is connected with an upright post of the traction power supply system and then is grounded, and a lower metal fitting thereof is connected with an F wire of the traction power supply system. The anti-lightning protection gap is characterized in that a horn electrode 4 is installed on the upper metal fitting of the suspension insulator and a bar electrode 5 with a bulb is installed on the lower metal fitting of the suspension insulator. An air gap 6 is formed between the horn electrode 4 and the bar electrode 5 with the bulb. The horn electrode 4 and the bar electrode 5 with the bulb are installed over against each other up and down and extend to the side far away from the power supply system. The anti-lightning protection gap is characterized by good economy, easy installation and high reliability and is especially suitable for being used on the F wire suspension insulator of the 27.5kV electrified railway.
Owner:SHANDONG XUNSHI ELECTRIC +3
Preparation method of SiC-ZrC segmented ceramic matrix composite spray pipe
ActiveCN103724040AGuaranteed StrengthStrong anti-oxidation and anti-ablation abilityTube furnaceOxidation resistant
A preparation method of a SiC-ZrC segmented ceramic matrix composite spray pipe is characterized in that the ceramic matrix composite comprises a porous C/C composite framework, a SiC coating and a ZrC coating. A CVI (chemical vapor infiltration) method is adopted to prepare a porous C/C precast body which is placed into absolute ethyl alcohol for ultrasonic oscillation and cleaning and placed into a graphite crucible after drying; Si is placed on the surfaces of a straight section and a skirt part of the porous C/C precast body, the porous C/C precast body with Si is then embedded by SiC powder, and the porous C/C precast body embedded by the Sic powder is placed into a tube furnace and heated to a high temperature; Zr is placed at the skirt section of the porous C/C precast body, and the porous C/C precast body with Zr is then placed into the tube furnace and heated to the high temperature; a melt is infiltrated into the porous body through capillary force and reacts to obtain the SiC-ZrC segmented ceramic matrix composite spray pipe. Obtained ceramic matrix composite has the advantages of light weight, high strength, low porosity, high antioxidant and ablation-resistant capacities, short preparation period and low cost.
Owner:TAICANG PAIOU TECH CONSULTING SERVICE
Lightning prevention protective clearance for electric railway traction power supply system
ActiveCN101645579AAvoid defectsStrong ablation resistanceHigh-tension/heavy-dress switchesLow voltageStainless steel electrode
The invention discloses a protective clearance for protecting an AC electric railway traction power supply system, which comprises an upright column, wherein a wrist and arm insulator is fixedly arranged on the upright column; the high-voltage side end and the low-voltage side end of the wrist and arm insulator are respectively provided with a hoop assembly; the upper parts of the two hoop assemblies are respectively provided with a stainless steel electrode; the two stainless steel electrodes oppositely form a cavel shape; an air clearance is formed between the two stainless steel electrodes;and the stainless steel electrode at the low-voltage side is directly connected to the upright column by a flexible wire. The top ends of the stainless steel electrodes are provided with stainless steel ball heads, and the ablation resistance is high; the protective clearance has the adjustable distance and can be matched with the wrist and arm insulators with different insulation distances; andthe stainless steel electrode at the low-voltage side is reliably connected with the upright column by a flexible wire, thereby preventing the hidden danger that an electric arc is easy to cause by hoop connection.
Owner:SHANDONG XUNSHI ELECTRIC +2
Preparation method of composite ceramic coating for surface of carbon/carbon composite
The invention relates to a preparation method of a composite ceramic coating for the surface of a carbon/carbon composite, and belongs to the technical field of aerospace. The preparation method specially comprises the steps of mixing Si powder with SiC powder and MoSi2 in molar ratio, adding a binder in a compounding ratio, and performing thorough mixing to obtain a mixture; adding deionized water to the mixture, performing blending to obtain viscous suspending liquid, allowing standing still, performing uniform stirring once again, and uniformly coating the suspending liquid onto the surfaceof the C/C composite, to form a precoated layer; performing air-drying prebaking treatment to form a carbon/carbon composite sample of which the surface is coated with an SiC-MoSi2 precoated layer, and putting the carbon/carbon composite sample in a mould for calcining, wherein the SiC-MoSi2 precoated layer and the carbon/carbon composite sample basal body are subjected to a chemical reaction, sothat the SiC-MoSi2 composite ceramic coating for the surface of the carbon/carbon composite is prepared. The SiC-MoSi2 composite ceramic coating for the surface of the carbon/carbon composite prepared according to the preparation method disclosed by the invention is tightly combined with the basal body through test with a scanning electron microscope and a metallographical microscope, and has favorable oxidation resistance and burning erosion resistance.
Owner:SHENYANG LIGONG UNIV
Device for operation of protective gap of transformer neutral point
ActiveCN103414157AImprove withstand voltageHigh operational reliabilityEmergency protective arrangements for limiting excess voltage/currentTransformerPower grid
The invention discloses a device for operation of a protective gap of a transformer neutral point. The device comprises a cavel-shaped gap and a metal plate installed in the middle of the cavel-shaped gap, wherein various operation characteristics of the gap can be adjusted through adjustment of the position of the metal plate, the withstand value of lightning over-voltage is improved, and meanwhile the breakdown value of power frequency over-voltage is reduced. The invention further discloses a method for operation of the protective gap of the transformer neutral point. According to the method and device for operation of the protective gap of the transformer neutral point, the probability of lightning arrester explosion due to overlong time of energizing of currents can be reduced, and reliable operation of a power grid is guaranteed.
Owner:SHENZHEN POWER SUPPLY BUREAU +1
High-temperature-resistant exhaust pipe coating and preparation method thereof
InactiveCN105504895AImprove high temperature resistanceImprove impact resistanceAnti-corrosive paintsHeat resistanceManganese
The invention discloses a high-temperature-resistant exhaust pipe coating and a preparation method thereof. The coating is prepared from raw materials in parts by weight as follows: 20-30 parts of aluminum powder, 11-22 parts of silica powder, 10-18 parts of manganese, 3-8 parts of carbon, 6-15 parts of zinc oxide powder, 2-4 parts of copper, 3-8 parts of mica powder, 3-7 parts of talc and a solvent. The mica powder and the talc are added to the aluminum powder, the silica powder, the zinc oxide powder and the copper, the high-temperature resistance of the coating is enhanced, the porous state caused by thermal decomposition in the preparation process is improved due to addition of the mica powder and carbon black, the coating is more stable, the added solvent has characteristics of high-temperature resistance and high corrosion resistance, meanwhile, the stability of a coating material can be improved, and the coating is safe and environment-friendly. The coating has multiple functions of curing, toughening, diluting, prolonging the pot life and the like, is used as a curing agent and enables a cured product to have higher heat resistance, flame retardance and ablation resistance and excellent electrical properties.
Owner:WUHU EVERSHINE AUTOMOTIVE COMPONENT
High-performance coating for exhaust pipe and preparation method thereof
InactiveCN105670498AImprove high temperature resistanceStrong corrosion resistanceFireproof paintsAnti-corrosive paintsSolventSilicone resin
The invention discloses a high-performance coating for an exhaust pipe and a preparation method thereof. The coating includes the following raw materials, by weight, 20-25 parts of silicone resin, 15-25 parts of a ferric oxide composite, 8-12 parts of carbon, 10-18 parts of manganese, 3-8 parts of sulfur, 6-15 parts of phthalic acid, 2-4 parts of copper, 3-8 parts of mica powder and 3-7 parts of talcum powder, and additives and solvents. IN the invention, the silicone resin and the ferric oxide composite are mixed with a mixture of the carbon, manganese, sulfur and copper, and then the mica powder and the talcum powder are added to improve the high-temperature resistance of the coating. The porous status due to thermal decomposition during the process is improved due to the mica powder and the talcum powder, so that the coating is more stable. The added solvent is high-temperature-resistant and has strong anti-corrosion property. High-temperature-curing silicone resin is employed and has stable chemical properties, strong hydrophobicity and is free of toxicity and irritation on skin, so that the coating is safe and environment-friendly.
Owner:WUHU EVERSHINE AUTOMOTIVE COMPONENT
Modified epoxide resin adhesive with high strength and preparing method thereof
InactiveCN106336841AHigh bonding strengthIncreased durabilityNon-macromolecular adhesive additivesMacromolecular adhesive additivesEpoxyPolymer science
The invention discloses a modified epoxide resin adhesive with high strength and a preparing method thereof. The modified epoxide resin adhesive is prepared from, by weight, 80-100 parts of epoxide resin, 3-21 parts of carboxylic acrylonitrile butadiene rubber latex, 1.1-7.7 parts of polyacrylate latex, 5-10 parts of quartz powder, 1.1-1.5 parts of aluminium silicate, 2-3 parts of anti-settling agent, 1-3 parts of aminopropyltriethoxysilan; the ratio of carboxylic acrylonitrile butadiene rubber latex to polyacrylate latex is 2.7:1; the modified epoxide resin adhesive with high strength has good properties of ablation resistance, acid and alkali resistance, moisture absorption and thermal stability, aging resistance, anti-shearing force, high insulation and high sealing, and in terms of electrical insulation property, due to quartz powder added in the formula, and the product after solidification has stronger insulation property and ablation resistance property.Owner:穆勇华
A double swirl injector
ActiveCN103867340BStrong interactionGood spray atomization performanceRocket engine plantsInspiratorBarrel Shaped
The invention provides a dual-rotational-flow inspirator, which comprises a top cover, a nozzle, an upper bottom, a middle bottom, a gas whirlcone and an inspirator cavity, wherein the inspirator cavity is a barrel-shaped hollow cylinder; a fuel cavity is formed between the top cover and the upper bottom of the inspirator; a gas oxidizing agent cavity is formed between the upper bottom and the middle bottom of the inspirator; a water cavity is formed between the middle bottom of the inspirator and the base of the inspirator; an inner nozzle passes through mounting holes in the upper bottom, the middle bottom and the inspirator cavity and is fixedly arranged on the upper bottom via a thread; the gas whirlcone is installed on the nozzle by a thread; water nozzles are water holes evenly distributed on the circumstance on the base of the inspirator. The inspirator provided by the invention has the characteristics of simple structure, low cost, good atomization performance and stable flame.
Owner:NAT UNIV OF DEFENSE TECH
A multi-component composite strengthened molybdenum alloy and its preparation method
The invention relates to a preparation method of a multi-element composite reinforced molybdenum alloy. The preparation method sequentially comprises the following steps that the Mo source, the Ti source, the Zr source, the C source, the Hf source and the Re source are weighed according to a certain weight ratio, the raw materials are prepared and mixed to obtain the uniform molybdenum alloy powder; the molybdenum alloy powder is placed in a mold cavity of a mold and is subjected to compression forming treatment to obtain a forming blank; high-temperature sintering treatment on the formed blank is carried out under vacuum to obtain a sintered blank; forging or rolling deformation processing is carried out on the sintered blank to obtain a forged blank or a rolled blank; and annealing heattreatment on the forged blank or the rolled blank is carried out to obtain the molybdenum alloy plate or a rod material. According to the preparation method, the steps and the process conditions are reasonable in design and good in using effect, the prepared molybdenum alloy material has excellent performance, the tensile strength Ra is greater than or equal to 200 MPa at a high temperature of 1600 DEG C, the percentage elongation after fracture is larger than or equal to 20%, and the oxygen content is less than or equal to 100 ppm.
Owner:安泰天龙钨钼科技有限公司 +1
Novel cavel combination gap
ActiveCN103414108AChange the electric field distributionAdjust action characteristicsHigh-tension/heavy-dress switchesEngineeringMetal
The invention discloses a novel cavel combination gap. The novel cavel combination gap comprises an H-shaped steel base, a first base sliding block, a second base sliding block, a third base sliding block, a cavel gap combination, an adjustable supporting column, a metal plate and a metal plate supporting seat. The first base sliding block, the second base sliding block and the third base sliding block are respectively embedded in the H-shaped steel base, and can slide along the H-shaped steel base; a first supporting column insulator is carried by the first base sliding block; the second base sliding block is used for supporting a second supporting column insulator; the metal plate is fixed to the second supporting column insulator through the metal plate supporting seat; the third base sliding block is used for carrying the adjustable supporting column; the cavel gap combination comprises a first insulator supporting column, a first cavel electrode arranged on the first insulator supporting column, the adjustable supporting column and a second cavel electrode arranged on the adjustable supporting column. Due to the implement of the novel cavel combination gap, the metal plate is additionally arranged between the cavel electrodes, and accordingly gap thunder and lightning withstand voltages of the gap under the same gap length condition can be increased and the power-frequency breakdown voltages of the gap can be reduced.
Owner:SHENZHEN POWER SUPPLY BUREAU +1
A closed planar three-electrode spark switch and its preparation method
ActiveCN110649467BMature and reliable technologyLow priceSparking plugsSpark gap detailsDetonatorPulse power systems
The invention belongs to the field of high-power pulses, and in particular relates to a closed planar three-electrode spark switch and a preparation method thereof. It includes the bottom PCB board, the circuit layer, the PP layer and the top PCB board in turn. The bottom PCB board is the substrate of the switch circuit layer; the circuit layer includes the anode, the cathode and the trigger electrode and the pads connected to them; the PP layer corresponds to the position of the pad There is a window for the pad, and an electrode window is set at the position corresponding to the electrode; the top layer PCB is provided with a pad slot corresponding to the pad, and a blind slot is provided at the position corresponding to the electrode; the PP layer is used as the top PCB board and the bottom layer The dielectric layer bonded to the PCB board uses the PP layer to press the bottom PCB and the bottom PCB board to form a cavity inside the entire switch. The invention utilizes printed circuit board technology to make the plane three-electrode spark switch into a closed type, which stabilizes the working environment of the switch, improves the ability of the switch to withstand high overload, and greatly reduces the cost, and can be widely used in explosive foil detonators, Pulse power systems such as electric guns.
Owner:NANJING UNIV OF SCI & TECH
Preparation method of ablation-resistant composite material wind cover
The invention discloses a preparation method of an ablation-resistant composite material wind cover. The preparation method comprises the following steps of preparing of a high temperature-resistant sand coating, preparing of a wind cover model and coating, box loading, metal smelting and casting, cooling, post-treatment and the like. The preparation method has the beneficial effects that the silica sand material with larger granularity is coated to the surface of the wind cover model at the outer surface of the wind cover, liquid steel can permeate into a gap between sands, and a metal and sand mechanically mixed ablation outer casing is formed; by adopting the technology of controlling the casting temperature of the liquid steel and the vacuum degree in a sand box, the thickness and uniformity of the mixed sintering ceramic layer are controllable, the ceramic layer is firmly adhered with the steel of the main body, the melting point is high, the hardness is high, the ablation-resistant property is strong, and the functions of delaying the ablation of the wind cover and prolonging the service life are realized; the procedures are simple, the number of auxiliary tools is fewer, thehigh temperature-resistant sand is free from sticking and can be repeatedly used, the production efficiency is high, and the cost is low.
Owner:YANTAI BRANCH NO 52 INST OF CHINA NORTH IND GRP
Lightning prevention protective clearance for electric railway traction power supply system
ActiveCN101645579BAvoid defectsStrong ablation resistanceHigh-tension/heavy-dress switchesStainless steel electrodeLow voltage
The invention discloses a protective clearance for protecting an AC electric railway traction power supply system, which comprises an upright column, wherein a wrist and arm insulator is fixedly arranged on the upright column; the high-voltage side end and the low-voltage side end of the wrist and arm insulator are respectively provided with a hoop assembly; the upper parts of the two hoop assemblies are respectively provided with a stainless steel electrode; the two stainless steel electrodes oppositely form a cavel shape; an air clearance is formed between the two stainless steel electrodes; and the stainless steel electrode at the low-voltage side is directly connected to the upright column by a flexible wire. The top ends of the stainless steel electrodes are provided with stainless steel ball heads, and the ablation resistance is high; the protective clearance has the adjustable distance and can be matched with the wrist and arm insulators with different insulation distances; andthe stainless steel electrode at the low-voltage side is reliably connected with the upright column by a flexible wire, thereby preventing the hidden danger that an electric arc is easy to cause by hoop connection.
Owner:SHANDONG XUNSHI ELECTRIC +2
Remote high-voltage pulse nanosecond switch applying insulating oil
The invention relates to a remote high-voltage pulse nanosecond switch applying insulating oil. The remote high-voltage pulse nanosecond switch comprises an organic glass shell, an electrode disk, a cathode, an anode, a triggering electrode, an electromagnet, a refined rapeseed oil serving as an insulating medium and a remote triggering and controlling system. The cathode, the anode and the electrode disk are tightly fixed together through bolts; the head of an electromagnet shell is provided with a thread and is connected with the organic glass shell of the switch; the tail end of an electromagnet core is connected with the triggering electrode through an organic glass rod; and the remote triggering and controlling system consists of a wireless remote controller, a receiving antenna, a high-frequency receiving module packaged in a metallic shield shell, a decoding integrated circuit (IC), a driving circuit, a relay and a storage battery. According to the remote high-voltage pulse nanosecond switch, radio signals emitted from the controller are received by the antenna, transmitted to the high-frequency receiving module and decoded by the decoding IC, the relay is driven by the driving circuit to energize the electromagnet and push the triggering electrode to move towards a main electrode, so that quick high voltage discharging is safely, reliably and conveniently realized, anda pulse wave form of which the rising edge is a nanosecond level is formed.
Owner:PLA UNIV OF SCI & TECH
A kind of preparation method of composite ceramic coating on the surface of carbon/carbon composite material
A method for preparing a composite ceramic coating on the surface of a carbon / carbon composite material belongs to the field of aerospace technology, and the specific steps are: taking Si, SiC and MoSi according to the amount ratio of substances 2 Mix the powder, add the binder according to the ratio, and mix thoroughly to form a mixture; add deionized water to the mixture to make a viscous suspension, stir it again after standing still, and evenly coat the suspension on C / The surface of the C composite material forms a pre-coating; after air-intervention drying treatment, the surface is coated with SiC‑MoSi 2 Pre-coated carbon / carbon composite sample placed in a mold for calcination, SiC‑MoSi 2 The chemical reaction between the pre-coating layer and the carbon / carbon composite material substrate produces SiC~MoSi on the surface of the carbon / carbon composite material 2 Composite ceramic coating. The surface SiC~MoSi of the carbon / carbon composite material prepared by the invention 2 The composite ceramic coating is tested by scanning electron microscope and metallographic microscope to be closely combined with the substrate, and has good oxidation resistance and ablation resistance.
Owner:SHENYANG LIGONG UNIV
A Hydrogen Oxygen Igniter Using Glow Plug
ActiveCN113006971BReduce electromagnetic interferenceReduce volumeRocket engine plantsGlow plugEngineering
A hydrogen-oxygen igniter using electric glow plugs includes an oxygen chamber top cover, a head, a body, electric glow plugs and a hydrogen chamber top cover. The hydrogen chamber cover is set on the outside of the upper part of the body, and the head is welded on the top of the body. A hydrogen collection chamber is formed between the hydrogen chamber cover, the head and the body, and the cavity of the head is connected with the cavity of the body to form an ignition The inner cavity of the device; the hydrogen collection cavity communicates with the cooling jacket of the body through the throttle hole. The top cover of the oxygen chamber is welded on the head; an oxygen collection chamber is formed between the top cover of the oxygen chamber and the head, and a blind hole is processed on the top of the head, which communicates with the inner cavity of the igniter. injector. Two glow plugs are installed symmetrically on the head, and a hydrogen injection cavity, a hydrogen injector and two hydrogen flow channels are also processed in the head, each hydrogen flow channel is perpendicular to the axis of the glow plug hole, and is used to connect the hydrogen collection The hydrogen injection cavity in the cavity and the head, the hydrogen injection cavity communicates with the inner cavity of the igniter through the hydrogen injector. The invention improves the ignition reliability and expands the applicable field of the electric igniter.
Owner:BEIJING AEROSPACE PROPULSION INST
Anti-ablation rubber composition used as anti-ablation protective coating in aluminum alloy products, aluminum alloy products and preparation method thereof
ActiveCN108165021BImprove the ability to resist high temperature and high pressure gas erosionImprove securitySilicon rubberAluminium alloy
The invention belongs to the technical field of anti-ablation protection of aluminum alloy, and particularly relates to an anti-ablation rubber composition used as an anti-ablation protective coatingin an aluminum alloy product, an aluminum alloy product and a preparation method of the aluminum alloy product. The invention provides an application of the anti-ablation rubber composition as the anti-ablation protective coating in the aluminum alloy product. The aluminum alloy product provided by the invention comprises a cylinder body and an anti-ablation protective coating adhered to the innersurface of the cylinder body, and the anti-ablation protective coating is primarily prepared from an anti-ablation rubber composition. The preparation method provided by the invention can be used todirectly cure modified silicone rubber material on the inner surface of a thin-wall aluminum alloy closing cylinder body; the thin-wall aluminum alloy closing cylinder body is protected from ablationunder the erosion of high-temperature high-pressure gas; and the method is particularly suitable for the anti-ablation protection of bullet shells and the inner surface of a small-caliber cartridge. The anti-ablation rubber composition provided by the invention has the characteristics of low cost, high safety factor and strong anti-ablation capability.
Owner:NO 59 RES INST OF CHINA ORDNANCE IND
A slip arc discharge enhanced supersonic aerosol mixing burner
ActiveCN109084328BSimple structureCompact structureContinuous combustion chamberThermodynamicsCombustor
The invention belongs to the technical field of scramjet engine fuel injection and flame stabilization and combustion organization, and discloses a slippage arc discharging enhanced supersonic air-mist mixing burner. The slippage arc discharging enhanced supersonic air-mist mixing burner comprises an installation base plate. A supporting plate body is arranged on the installation base plate, array-type sliding arc discharging modules are arranged on the tail portion of the supporting plate body, the array-type sliding arc discharging modules are electrically connected with a high-frequency high-voltage power source, a fuel injection rod is arranged in the tail portion of the supporting plate body in an inserted mode, a cavity is formed in the fuel injection rod, and liquid fuel injection holes communicating with the cavity are formed in the fuel injection rod. According to the slippage arc discharging enhanced supersonic air-mist mixing burner, the structure is simple and compact, andthe functions of liquid fuel injection, atomization, mixing enhancement, ignition and combustion enhancement are integrated.
Owner:HUNAN AIRTOPS INTELLIGENT TECH CO LTD
Preparation method of SiC-ZrC segmented ceramic matrix composite spray pipe
A preparation method of a SiC-ZrC segmented ceramic matrix composite spray pipe is characterized in that the ceramic matrix composite comprises a porous C / C composite framework, a SiC coating and a ZrC coating. A CVI (chemical vapor infiltration) method is adopted to prepare a porous C / C precast body which is placed into absolute ethyl alcohol for ultrasonic oscillation and cleaning and placed into a graphite crucible after drying; Si is placed on the surfaces of a straight section and a skirt part of the porous C / C precast body, the porous C / C precast body with Si is then embedded by SiC powder, and the porous C / C precast body embedded by the Sic powder is placed into a tube furnace and heated to a high temperature; Zr is placed at the skirt section of the porous C / C precast body, and the porous C / C precast body with Zr is then placed into the tube furnace and heated to the high temperature; a melt is infiltrated into the porous body through capillary force and reacts to obtain the SiC-ZrC segmented ceramic matrix composite spray pipe. Obtained ceramic matrix composite has the advantages of light weight, high strength, low porosity, high antioxidant and ablation-resistant capacities, short preparation period and low cost.Owner:TAICANG PAIOU TECH CONSULTING SERVICE
A Magnetoplasma Thruster with Conical Porous Hollow Cathode
ActiveCN106337791BEasy to assemble and disassembleWith stableMachines/enginesUsing plasmaElectricityThermal expansion
The invention discloses a magnetic plasma thruster provided with a conical porous hollow cathode and belongs to the electric propulsion field. The magnetic plasma thruster provided with the conical porous hollow cathode is of a cylindrical structure as a whole. The exterior of the magnetic plasma thruster provided with the conical porous hollow cathode sequentially comprises a middle connection piece, an anode connection piece and an anode from left to right. The anode connection piece is connected with the anode and the middle connection piece at the same time. The interior of the magnetic plasma thruster provided with the conical porous hollow cathode sequentially comprises a second cathode connection piece, a first cathode connection piece, an insulator and the cathode from left to right, and the second cathode connection piece, the first cathode connection piece, the insulator and the cathode are coaxially matched; the second cathode connection piece is provided with the first cathode connection piece in a matched manner in the radial direction; the insulator is arranged in the anode connection piece in a clamped and sleeved manner; the cathode is clamped to the insulator and the conical face of the first cathode connection piece; and the conical face of the cathode and the conical face of the first cathode connection piece are closely matched through a 5-degree conical angle. The magnetic plasma thruster provided with the conical porous hollow cathode has the beneficial effects that the cathode is wrapped in the cathode connection pieces, the second cathode connection piece tightly presses the tail portion of the cathode, it is guaranteed sufficient pressing force exists on the cathode, and the situation that the cathode becomes less crowded because of thermal expansion is prevented; and a porous structure is adopted for the head portion of the cathode, a larger current emitting area is achieved, and the current emitting capacity is improved.
Owner:BEIHANG UNIV
A combination of croissants
ActiveCN103414108BChange the electric field distributionAdjust action characteristicsHigh-tension/heavy-dress switchesEngineeringBreakdown voltage
The invention discloses a novel cavel combination gap. The novel cavel combination gap comprises an H-shaped steel base, a first base sliding block, a second base sliding block, a third base sliding block, a cavel gap combination, an adjustable supporting column, a metal plate and a metal plate supporting seat. The first base sliding block, the second base sliding block and the third base sliding block are respectively embedded in the H-shaped steel base, and can slide along the H-shaped steel base; a first supporting column insulator is carried by the first base sliding block; the second base sliding block is used for supporting a second supporting column insulator; the metal plate is fixed to the second supporting column insulator through the metal plate supporting seat; the third base sliding block is used for carrying the adjustable supporting column; the cavel gap combination comprises a first insulator supporting column, a first cavel electrode arranged on the first insulator supporting column, the adjustable supporting column and a second cavel electrode arranged on the adjustable supporting column. Due to the implement of the novel cavel combination gap, the metal plate is additionally arranged between the cavel electrodes, and accordingly gap thunder and lightning withstand voltages of the gap under the same gap length condition can be increased and the power-frequency breakdown voltages of the gap can be reduced.
Owner:SHENZHEN POWER SUPPLY BUREAU +1
A preparation method of ablation-resistant composite windshield
The invention discloses a preparation method of an ablation-resistant composite material wind cover. The preparation method comprises the following steps of preparing of a high temperature-resistant sand coating, preparing of a wind cover model and coating, box loading, metal smelting and casting, cooling, post-treatment and the like. The preparation method has the beneficial effects that the silica sand material with larger granularity is coated to the surface of the wind cover model at the outer surface of the wind cover, liquid steel can permeate into a gap between sands, and a metal and sand mechanically mixed ablation outer casing is formed; by adopting the technology of controlling the casting temperature of the liquid steel and the vacuum degree in a sand box, the thickness and uniformity of the mixed sintering ceramic layer are controllable, the ceramic layer is firmly adhered with the steel of the main body, the melting point is high, the hardness is high, the ablation-resistant property is strong, and the functions of delaying the ablation of the wind cover and prolonging the service life are realized; the procedures are simple, the number of auxiliary tools is fewer, thehigh temperature-resistant sand is free from sticking and can be repeatedly used, the production efficiency is high, and the cost is low.
Owner:YANTAI BRANCH NO 52 INST OF CHINA NORTH IND GRP
Switch with trigger
ActiveCN102723934BImprove insulation performanceConforms to outline requirementsElectronic switchingBinding postCharge and discharge
The invention discloses a switch with a trigger, which comprises a switch body and a trigger, wherein the switch body comprises a binding post, an insulating cover plate, a metal shell, a pair of air nozzles, a columnar insulator, an export pole, an upper electrode base, an upper electrode sleeve, an upper graphite electrode, a lower electrode base, a lower electrode sleeve, a lower graphite electrode, a ceramic pipe and a trigger pin; and the trigger comprises a trigger slot, a trigger output electrode, a grounding metal ring, and a functional display panel. The binding post is arranged at the center of the insulating cover plate, the insulating cover plate is connected with the metal shell to form a sealed chamber used for electrically partitioning the binding post and the metal shell, the air nozzles are symmetrically arranged on the side of the metal, and are used for charging and discharging the switch body with gas, the columnar insulator is fixed to the bottom of the switch body, the export pole penetrates through the columnar insulator along the axial direction, and the upper electrode base is connected with the insulating cover. The switch disclosed by the invention can solve the problem that a three-electrode trigger pipe type switch is electrically connected with the trigger. Moreover, the switch is compact in structure.
Owner:武汉华中华昌能源电气科技有限公司
Megavolt low jitter multi-stage corona switch
A megavolt low jitter multistage corona switch comprises a knife structure electrode 1, a plate electrode 2, a first insulator 3, a screw 4 and a second insulator 5. The corona switch comprises multi-stage corona intervals which employ knife-board structure; the electrode of each corona interval is adjustable; and sulfur hexafluoride gas is supplied to the corona switch. When the switch works, one-stage corona interval is preferentially broken down, and other corona intervals are broken down in the overvoltage. Because the structure of each-stage corona interval is the same, the breakdown voltage of each corona interval is the same. The structure with the same corona interval cascading ensures the low breakdown voltage jitter, reduces the electric field enhancement coefficient, improves the breakdown voltage of the corona intervals and ensures that the corona intervals of overvoltage breakdown have enough high undervoltage rate so as to obtain fast output pulse front edge.
Owner:NORTHWEST INST OF NUCLEAR TECH
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