61results about How to "Improve ablation performance" patented technology

The invention discloses an electric conical valve type gas flow regulator for solid rocket ramjets. A drive motor is fixed to a connecting box. One end of a coupling is fixedly connected with a shaft of a motor, and a slider is disposed in a slide hole in the other end of the coupling. The slider is fixedly connected with a valve stem through a tension and pressure sensor. A drive nut is fixedly connected to a solid gas generator. The valve stem passes the drive nut and in threaded fit with the drive nut. A conical valve head is fixedly connected with the valve stem in a threaded manner and extends into a spray pipe of the gas generator. The gas generator is in an inner shell structure which is hollow. The valve stem is fitted in the inner shell, and a bushing is fitted between the valve stem and the gas generator. One end of the valve stem, close to the conical valve head, is provided with a peripheral circular groove, and a moving seal is disposed in the circular groove. A pressure sensor is mounted on the rear head of the gas generator. The electric conical valve type gas flow regulator for solid rocket ramjets is simple in structure, small in size, reliable in operation, low in ablation effect, low in cost, and accurately controllable.

The invention discloses a contact material applied to middle-high-voltage vacuum switch-on/off and a preparation method for the same. The contact material is prepared from the following raw materials in percent by weight: 5-50% of Cr powder, 1-15% of carbide and the balance of Cu powder. Compared with the prior art, the contact material disclosed by the invention has the beneficial effects that a design thought of further distributing a ceramic phase with a higher melting point in the existing copper-based material except a Cr phase with a high melting point is adopted; the ceramic phase has the functions of reinforcing the mechanical performance of the copper-based material and improving the welding resistance of the contact material; and via a hot-pressing sintering process, the compactness of a mixed powder contact is improved, and the material defects of closed pores, enrichment and the like of the mixed powder contact are reduced, thus improving the ablation performance of the contact material. Therefore, the contact material applied to middle-high-voltage vacuum switch-on/off disclosed by the invention is low in resistivity, improved in hardness, mechanical strength and compactness compared with common mixed powder contacts, improved in the voltage-resistant capacity of the mixed powder contact, strong in switch-on/off capacity, and good in welding resistance.

The invention relates to the field of glass fiber cloth manufacturing, and discloses a preparation technology of glass fiber cloth. The preparation technology comprises the steps of manufacturing grey cloth, rebeaming, and performing first thermal cleaning, second thermal cleaning, air airing and surface treatment. The glass fiber cloth has outstanding high temperature resistance, and good ablation performance, and an insulation grade of an electrotechnical product is raised.

The invention discloses a heat-proof device for a swing type rocket engine nozzle, and belongs to the technical field of heat-proof and insulation devices for space launch. The heat-proof device for the swing type rocket engine nozzle comprises a nozzle flange, a cabin shell rear end cover and a heat-proof telescopic apron board; the nozzle flange is connected with an inner ring end surface of theheat-proof telescopic apron board, and the cabin shell rear end cover is connected with an outer ring end surface of the heat-proof telescopic apron board; the section of the heat-proof telescopic apron board is of a corrugated structure; and the heat-proof telescopic apron board is made of flexible ablation-resistant heat-proof materials. The problems that the structure is cracked due to poor ductility, and internal equipment is burnt by flame backflow since the apron board is of a flat plate type or conical surface heat insulation structure made of metal or composite materials are solved. The heat-proof telescopic apron board is made of flexible ablation-resistant heat-proof materials, and the section is of the corrugated structure, the flame of an engine can be prevented from flowing back to the interior of a cabin body, the returned flame is blocked from entering the cabin body, and the heat-proof device has high barrier property on ablation property and gas flow.

The invention discloses a processing technology of glass fiber. Specifically, the steps are as follows: adding raw material glass, a clarifying agent, a halide, mirabilite, quartz sand and firefly powder into a melting furnace; heating the melting furnace to make a temperature of the glass rise, first performing preheating, then performing melting, performing wire-drawing on a molten glass liquidby using a wire drawing machine, performing cooling forming on the drawn glass fiber by water, putting the cooled glass fiber into an acid solution, and stirring the acid solution by using an acid resistant pump under assistance of bubbling stirring to enhance ion exchange. The technology is simple and practicable, the produced glass fiber has good insulation, good corrosion resistance, high mechanical strength, and excellent high-temperature resistance, can be used at 1100 DEG C or less for a long time, has good ablation performance, and better high-temperature resistance, chemical corrosionresistance and elastic modulus, and is widely used in manufacturing of precision instrument thermal protection parts, ablation materials, thermal insulation materials and other fields.

The invention relates to a preparation method for glass fiber. The method comprises the following steps: 1) mixing and fusing raw materials, and wiredrawing to form a crude fiber product; 2) putting the crude fiber product into a muffle furnace, removing water attached to the glass fiber surface, and then performing acid-base immersion cleaning, thereby acquiring a refined glass fiber product; 3) soaking the refined glass fiber product into a NaOH solution and then taking out, washing with distilled water, taking out and dispersing in absolute ethyl alcohol of a coupling agent KH570, regulating pH and dispersing with an ultrasonic meter, thereby acquiring a semi-finished product of glass fiber; 4) removing surface alkali liquor by spraying the surface of the semi-finished product of glass fiber with warm water, then soaking in clean water, and washing with the assistance of a hot water pump till the pH value is less than 6, thereby acquiring a to-be-finished product of glass fiber; 5) performing thermal shaping treatment on the to-be-finished product of glass fiber, and performing gumming, grouting and drying on the surface, thereby acquiring the end product. The preparation method has the advantages of simple structure, low cost and suitability for large-scale industrial manufacturing.

The invention discloses a closed discharge gap triggered by a plasma jet and an application thereof. The closed discharge gap comprises a plasma spraying unit comprising an injection device and a plasma trigger T, wherein the injection device is arranged in a contact unit, generates plasmas and ablate the ablation materials through pulse voltages and currents and generates a plasma jet by adoptinga capillary action of an elongated cavity, the injection device is connected with a plasma trigger T through the high voltage wire LA, the contact unit is arranged in the cavity unit for tolerance ofarc ablation, the cavity unit is used for providing a closed high-pressure gaseous medium environment. The closed discharge gap can ensure the reliable operation in the low work parameters, improvesthe control performances of the discharge gap, increases the work range and service life of the discharge gap, solves the problems that the arc is extinguished due to the small gap current, avoids thegap breaking, and replaces the complex and high-cost energy storage and freewheeling device.

The invention relates to an EPDM heat-insulation layer material, and a preparation method and an application thereof, specifically to a windable EPDM heat-insulation layer material and a preparation method and an application for the windable EPDM heat-insulation layer material, belongs to the technical field of heat insulation of solid rocket motors, and specifically relates to an EPDM heat-insulation material which can be prepared into a raw adhesive tape, is applicable to a winding molding process and has excellent comprehensive performance. According to the invention, through addition of polar rubber into EPDM rubber for reinforcement, an unvulcanized heat-insulation layer material has certain tensile strength, and is easily prepared into a strip-shaped heat-insulation layer and wound into a disk, so continuous molding and mechanized operation can be realized.

The invention discloses a new type of glass fiber, which relates to the technical field of new materials. The glass fiber is mainly composed of SiO2, Al2O3 and CaO raw materials, and on this basis, MgO, ZrO2, TiO2, Fe2O3, Na2O, K2O and Li2O and other components are introduced. The manufacturing process includes raw material mixing and melting, acid leaching, water cleaning, heat treatment, post-surface treatment, etc. The glass fiber prepared by the above process has high silica content, smooth appearance and uniform color, which can be well applied to Various post-processing manufacturing processes, excellent high temperature resistance, can be used for a long time below 1100°C, has good ablation performance, better high temperature resistance, chemical corrosion resistance and elastic modulus, and can be widely used in the manufacture of precision instruments Heat protection parts, ablation materials, thermal insulation materials and other fields.

The invention discloses a preparation method of a graphite crucible. The preparation method comprises the following steps: S1, raw material preparation: raw materials comprise graphite scraps, an Acheson furnace petroleum coke resistance material, an Acheson furnace petroleum coke thermal insulation material and medium-temperature coal pitch; s2, burdening: graphite is crushed and ground into graphite powder, then the graphite powder is mixed with the Acheson furnace petroleum coke resistance material, the Acheson furnace petroleum coke resistance material and the Acheson furnace petroleum coke heat preservation material according to the mass ratio of 3: 2: 5, the mixture is ground into mixed powder, the mixed powder is mixed with medium-temperature coal pitch, the mass percent of the mixed powder in the mixing process is 65%-85%, and the medium-temperature coal pitch is obtained; the mass percent of the medium-temperature coal pitch is 15%-35%; s3, mixing and kneading; s4, profiling is conducted; s5, roasting; and S6, processing. A hot-pressing cold-out one-time forming method is adopted, the obtained product is excellent in performance and shows good thermal shock resistance, ablation performance, leakage-proof performance and mechanical strength, and the preparation process has the advantages in the aspects of saving energy, protecting the environment, shortening the period and improving the aging efficiency.

The invention provides a preparation method of a glass fiber composite material. The preparation method comprises the following steps that a, glass powder, selected high filter residue, calcium oxide,magnesium oxide, titanium dioxide, aluminum oxide and silicon dioxide are mixed and smashed, and mixed powder is obtained; b, a substrate material, glycidyl methacrylate, sodium pyrophosphate and pentaerythritol ester are mixed to be uniform and melted to be at a molten state, and a first material is obtained after heat preservation is conducted; c, the mixed powder is added into the first material and melted and stirred, then subjected to fusion wiredrawing, and a crude product is obtained; and d, the crude product is subjected to acidification treatment, treatment is conducted on the crudeproduct by using a silane coupling agent, heat treatment is conducted consecutively, and finally drying is conducted. The prepared glass fiber composite material has good ablation performance, betterhigh temperature resistance, the chemical corrosion resistant property and the elasticity modulus.

The invention discloses a glass fiber which comprises the following raw materials in parts by weight: 30-50 parts of SiO2, 6-10 parts of Al2O3, 1-4 parts of CaF2, 10-14 parts of ZrO2, 11-16 parts of Ln2O3, 4-6 parts of TiO2, 60-70 parts of H2O and 50-70 parts of H3BO3. The glass fiber is mainly prepared by the following steps: mixing the raw materials, melting, drawing, pickling and performing heat setting treatment. The glass fiber disclosed in the invention has the beneficial effects that (1) the glass fiber disclosed in the invention is excellent in acid resistance, low in molding temperature and low in cost, and the production efficiency is improved; (2) the glass fiber disclosed in the invention is excellent in high temperature resistance, can be applicable to a temperature of 1000 DEG C or less for a long time, and has excellent ablation property, excellent high temperature resistance and chemical resistance; (3) the processing technology of the glass fiber is low in cost, simpleto operate and suitable for more small and medium-sized enterprises.

The invention provides a preparation method of a brake block material for a rubber and plastic mixing motor vehicle. The method comprises the following steps of S1, modifying carbon fiber; S2, preparing modified calcium carbonate; S3, weighing the following ingredients in parts by weight: 5 to 10 parts of nitrile rubber, 20 to 30 parts of phenolic resin, 5 to 9 parts of aramid pulp meal fiber, 8 to 14 parts of needle-shaped wollastonite, 3 to 5 parts of vermiculite powder, 2 to 4 parts of barite powder, 6 to 8 parts of calcium silicate ceramic powder, 3 to 6 parts of barium sulfate, 5 to 8 parts of basalt fiber, 10 to 20 parts of modified carbon fiber and 1 to 2 parts of modified light calcium carbonate; S4, mixing and stirring the ingredients; performing hot pressing shaping on the mixedmaterials by a hot press; finally performing heat treatment. The brake block material for the rubber and plastic mixing motor vehicle has the characteristics of wear resistance, heat resistance and long service life.

The invention relates to a preparation method of a SiC nanowire toughened HfC-SiC complex phase coating by chemical vapor co-deposition. The preparation method adopts a three-step method and comprises the following steps: firstly, preparing a SiC inner coating by using an embedding method, then, introducing free silicon on the surface of the SiC inner coating by using a vapor siliconizing technology, carrying out chemical vapor deposition on HfC on the surface of a C/C sample with the SiC-SiC inner coating, and enhancing the interface bonding strength between the inner coating and the outer coating through in-situ reaction and diffusion of free silicon in the vapor deposition process. The SiC/HfC-SiC coating which is uniform in thickness, compact in structure, controllable in component and high in binding force can be prepared. On the basis of a mechanical bonding interface of a traditional method, an interface diffusion layer is introduced for diffusion to form diffusion bonding. And the coating process is simple, the reaction period is short, the cost is low, and the development prospect is wide.

The invention discloses a laser-assisted precise circuit manufacturing method, which comprises the following steps that a production board is provided, and circuits needing to be manufactured on the production board comprise a thick circuit with the circuit distance larger than 50 microns and a precise circuit with the circuit distance smaller than or equal to 50 microns; a film is pasted on the production board, exposure treatment is carried out, exposure of the coarse lines and the precise lines is completed, and all gap parts between the precise lines are exposed; developing and etching the production board, wherein the etching amount during etching is controlled to be greater than half of the copper thickness of the circuit, and the bottom layer base material is not exposed; ablating a gap part between the precision circuits by adopting laser to remove a film and a part of copper layer at the gap of the precision circuits; and carrying out etching treatment and film stripping on the production board again, and forming a thick circuit and a precise circuit on the production board. According to the method, the technological process is optimized, the laser ablation and chemical etching combined copper removal mode is adopted in sequence, manufacturing of the precise circuit with the distance smaller than or equal to 50 micrometers can be achieved, the material and machining cost is low, and the technological process is simple.

The invention discloses a high-strength and high-temperature-resistant fiber material. The high-strength and high-temperature-resistant fiber material comprises the following raw materials in parts byweight: 550-600 parts of silicon dioxide, 270-300 parts of calcium oxide, 150-200 parts of aluminium oxide, 100-120 parts of magnesium oxide, 80-120 parts of lithium oxide, 10-14 parts of titanium oxide, 30-50 parts of phosphor, 5-10 parts of sodium oxide, 8-12 parts of sulfate, 6-10 parts of iron sesquioxide and 8-12 parts of boron oxide. The high-strength and high-temperature-resistant fiber material comprises the following steps: first step, separately pulverizing the raw materials into particles with the grain size being 50 nm-0.15 mm; second step, mixing the silicon dioxide, the aluminium oxide, the magnesium oxide and the phosphor in advance and heating the mixture to the temperature being 900-1100 DEG C; third step, feeding smashed residual particles into a pre-heating furnace, feeding the pre-heated product into a heating furnace and fusing the pre-heated product at the temperature being 1650-1950 DEG C for 5-7 hours; and fourth step, feeding the fused product into a thread throwing machine to obtain fibers, wherein the revolving speed of a thread throwing roll is 8000-12000 revolutions per part, and the lengths of the fibers are 420 pm-650 pm. The produced fibers are highin mechanical strength, good in chemical stability and good in thermal stability; the acid resistance is improved; and the coefficient of thermal expansion is reduced.