1693 results about "Vacuum furnace" patented technology

The invention relates to a multi-hole foamed metal material and the manufacturing method. It includes the following steps: equally dispersing metal or alloy powder that has the particle diameter at 1-100um into solution contains adhesive agent to make slime, pouring the slime into through-hole polyurethane sponge foam, after taking drying and sintering, the material would be gained. It also could be make by the method of directly isostatic cool pressing one or more metal or alloy powder, isostatic cool pressing after mixing with pore forming material or isostatic cool pressing after mixing with adhesive agent solution to gain green pressing that would be sintered in vacuum furnace to make the material. The invention could be used to process vehicle tail gas and could also be used to filter the smoke form thermal power station or metallurgical furnace.

The invention relates to a preparation method for a silicon carbide ceramic tube or rod. An extrusion moulding method is adopted to form a blank body; a normal pressure sintering method is adopted for sintering; and submicron level silicon carbide powder and additives are taken as main raw materials. The preparation method comprises the following steps: 1) carrying out ball milling on the main raw materials by a dry method, adding water, a dispersant, a plasticizer, a lubricant and a liquid state binder, and then carrying out ball milling by a wet method; 2) adopting a spray granulation process to granulate silicon carbide slurry; 3) extruding the blank body by a one-shot direct extrusion moulding method after vacuum pug, corrosion, and vacuum pug; 4) drying the molded blank body by a stage drying mechanism; and 5) placing the blank body of the silicon carbide ceramic tube or rod in a vacuum furnace and carrying out sintering for two times by taking argon gas as protective gas. The high temperature resisting strength and the corrosion resistance of the silicon carbide ceramic tube or rod prepared by the method are both better than those of a reactive sintered product. Compared with a hot press sintering method, the method has lower limit on the product shape and size, and lower cost. The method is suitable for the industrialized production.

The invention discloses a production method of low-silicon and low-carbon deep punching/drawing steel, bottom-blowing argon is performed in the whole process of converter smelting, and a single slag/double slag technique is adopted to pour out the dephosphorized slag, high-basicity slag is produced in later period, the dualistic basicity of final slag R is more than 3.5, the terminal temperature of molten steel is 1620 DEG C to 1650 DEG C, and tapping ( P ) is less than 0.012 percent. The molten steel is refined by adopting low-silicon and low-carbon high-basicity reductive slag in a LF furnace refining station, thus to manufacture reductive slag for desulphurisation, and the ( Al ) in the molten steel is less than 0.005 percent. The molten steel refined by the LF furnace is vacuum-treated by a RH vacuum furnace, the carbon and the silicon in the molten steel is circularly removed, the molten steel is continuously casted into a casting blank through a CSP sheet bar conticaster, the casting blank is sent into CSP sheet bar heat continuous rolling mill and rolled into a coiled sheet after being heated in a roller hearth soaking furnace, a hot rolled coiled sheet is coldrolled into cold rolled coiled sheet through a cold tandem mill or a single mill after being acidwashed, and leveled through a leveling machine after being annealed by a cover furnace, and a leveling divided coil is stretched and divided. The production method has the advantages that the production cost of the working procedure is saved, the consumption of the refractory consumption of the converter is reduced, the equipment investment is saved, the process of the production technique is steady and smooth, the n value of the cold rolled plate is bigger than 0.23, the r value thereof is bigger than 2.1, and the deep punching performance and the extensibility are good.

The invention discloses a high-cleanliness pipeline steel smelting process. The process route comprises molten iron pouring, molten iron pretreatment, converter smelting, tapping, deoxidizing, alloying, LF refining furnace, treating with calcium, RH vacuum furnace and continuous casting and is characterized by comprising the following specific steps: firstly, converter smelting process; secondly, refining furnace smelting process; and thirdly, continuous casting process. The invention belongs to a steel-making process in the field of metallurgy and relates to a method for smelting and controlling a high-cleanliness pipeline steel. By molten iron desulphurization pretreatment, optimizing a converter tapping and deoxidizing system and a slagging system, LF refining furnace deep deoxygenation and reducing slag manufacturing processes, RH high-vacuum-degree degassing and inclusion removal process, the pouring is protected by the continuous casting in the whole process so that the composition of a casting billet is uniform, the contents of harmful elements such as S, P, O, N and H are low, the non-metallic inclusions are effectively controlled, the casting billet is good in internal quality and the production of high value-added ultra-low sulfur steel is ensured.

A method of making pairs of thread splits inserts used to injection mold bottle preforms. Machining a hollow outer part of the pair of thread split inserts with an opening therethrough and outer portions of two cooling conduits extending from the opening therethrough to respective inlets and outlets. Making an inner part of the pair of thread split inserts by injection molding a ceramic core with the required shape and investment casting the inner part around the ceramic core. The outer surface of the inner part having grooves to partially form inner portions of the two cooling fluid conduits. Then machining the cast inner part to fit in the opening through the outer part. Mounting the outer part around the inner part with the inner and outer portions of the two cooling fluid conduits aligned. Applying brazing material between the inner and outer parts and heating them in a vacuum furnace to integrally braze them together. Finally, cutting the integral inner and outer parts in half to form the pair of thread split inserts with each of the thread split inserts having one of the cooling fluid conduits therein.

A method for manufacturing high-cleaning and high carbon complex bearing steel includes: 1) choosing charging mixture 2) first steel making molten steel by is greater than or equal to 30ton electric furnace a. smelting furnace burden b. running out foaming slag and adding lime c. alloying when steel tapping with 92% tap and >90% level 3) refining molten steel by steel ladle furnace a. cleaning steel ladle and furnace cleaning b. through bottom blowing argon mixing with 60 min, earlier stage argon blowing intensity 0.4Mpa and later stage 0.3Mpa, material adding amount is less than or equal to 8Kg/ton steel c. precipitating and deoxidizing by two-stage aluminum feeding method, adding crystallized silicon powder, fluorite(content of calcium is greater than or equal to 98%) into slag face, and dispersing deoxidizing 4) vacuum furnace treating a. bottom blowing argon 0.3Mpa, 25min, vacuum content is less than or equal to 140Pa b. bottom blowing argon mixing 15min, 0.1Mpa without materials after treating 5) molten steel mould casting under inactive gas a. ingot moulding temperature 70deg.C, runner brick coating b. pouring speed 5.1ton steel/min of ingot body and mouth. It achieves high yield.

The invention discloses a preparation method for a carbon/carborundum composite material. Firstly, carbon fibre is woven into single-layer plain cloth; a plurality of layers of the plain cloth are superposed, and are punctured and stitched with carbon fiber, thus forming a prefabricated carbon fiber body. The prefabricated carbon fiber body is arranged in a vacuum furnace and boiled off as well as pretreated; subsequently, pyrolytic carbon deposits, thus getting the C/C composite material; the multihole C/C composite material is heated; a SiC basal body is impregnated in the treated C/C composite material by adopting the CVI method, thus getting the C/SiC composite material. As the C/SiC composite material is prepared by puncturing and stitching the prefabricated carbon fiber body in combination of the CVI method. The interlaminar shear strength of the C-SiC composite material at 1200 DEG C is increased to 36 to 49MPa from 22 to 24MPa of the prior art; the tensile strength is increased to 275 to 345MPa from 220 to 300MPa of the prior art.

The invention discloses a preparation method of a silicon carbide fiber reinforced silicon carbide composite material. The preparation method comprises the following steps of preparing a SiC fiber knitted piece, placing the SiC fiber knitted piece into a vacuum furnace to carry out chemical vapor deposition through adopting methane or propylene as feed gas and a pressure difference method to deposit a carbon coating on the surface of the SiC fiber knitted piece, carrying out a vacuum impregnation process on the SiC fiber knitted piece deposited with the carbon coating through adopting a liquid SiC ceramic precursor as impregnation liquid, putting the impregnated SiC fiber knitted piece into a mold, carrying out thermal molding crosslinking in a dynamic nitrogen atmosphere, putting the crosslinked SiC fiber knitted piece into a cracking furnace to carry out high temperature cracking in a dynamic nitrogen atmosphere, repeating a vacuum impregnation-thermal molding crosslinking-high temperature cracking cycle so as to finish preparation until the weight increment of a sample obtained after the vacuum impregnation-thermal molding crosslinking-high temperature cracking cycle is less than 1% of the weight increment of the sample obtained after the previous cycle. The preparation method has the advantages of short period, low cost, low pollution and toxic effects, etc.

The invention discloses a method for preparing an extra-coarse grained carbide alloy. The method is characterized by comprising the following steps of: pre-mixing extra-coarse tungsten carbide powder having a grinding Fisher particle size of over 6 mu m and cobalt powder; adding molding agents and pressing the mixture to form lumps; pre-sintering the lumps in a degumming furnace having ammonia decomposition gas therein; placing the obtained product, the tungsten carbide powder and the cobalt powder into a ball mill for smashing and wet grinding to prepare a mixture containing 6 to 13 percent cobalt; adding molding agents into the mixture, and pressing to obtain the finished product; after degumming the finished product, sintering the finished product at the high temperature by using a pressurized sintering furnace; and thermally treating the sintered product by using a double-chamber high-pressure gas cooling vacuum furnace, wherein 87 to 94 parts of tungsten carbide, 6 to 13 parts of carbide powder and 0.5 to 2.5 parts of molding agent are pre-mixed. The method avoids the dispersing or grading sieving, and cobalt coating of the tungsten carbide; moreover, the prepared carbide alloy has good compactness, high strength and impact resistance, simple production process and no environment pollution.

The invention relates to a grain boundary diffusion method for improving properties of sintered NdFeB magnets. The grain boundary diffusion method comprises the following steps of stacking sintered NdFeB magnets and diffusion alloy sheets together and placing in a hot-pressing furnace; vacuumizing the hot-pressing furnace until the vacuum degree reaches a set value, heating the hot-pressing furnace, and when the temperature of the hot-pressing furnace reaches a set value, beginning to exert a pressure and maintaining the pressure and putting the diffused sample into a high-vacuum furnace for annealing, wherein the diffusion alloy sheets are low-melting-point eutectic diffusion alloys and are represented by R-TM, R is one or more of Sc, Y, La, Ce, Pr or Nd and TM is one or more of Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn. Compared with the prior art, the sintered NdFeB magnets modified by the pressure diffusion method, which is provided by the invention, have the advantages of large diffusion depth of a diffusion agent, uniform distribution of grain boundary phases, high coercivity and the like, especially, low-melting-point diffusion alloys designed by the invention are free of expensive heavy rare earth element dysprosium and thus the cost of the raw materials is relatively low, the diffusion temperature is low and the energy consumption in the diffusion process is small.

A collimator filter for a physical vapor deposition apparatus useful for coating semiconductor wafers includes a plurality of corrugated ribbons attached at abutting double-walled nodes by resistance spot welding. The nodes are sealed by application of a braze material to diverging wall portions of the nodes by extrusion or spraying, followed by heating in a vacuum furnace. Alternatively, the nodes may be sealed by application of a braze material foil to a top and a bottom surface of the collimator followed by heating in the vacuum furnace. By sealing the nodes, a significant reduction may be achieved in outgassing and generation of particulate contaminants.

The invention discloses a high-temperature synchrotron radiation in-situ research device. The high-temperature fused salt synchrotron radiation in-situ research device comprises a fused salt test tube, a vacuum furnace, a heating device, a first ionization chamber, a second ionization chamber or a charge coupled device (CCD) detector and an external fluorescence detector, wherein a cavity is formed in the vacuum furnace; an incident window, a transmission window and a fluorescence window are arranged on the furnace wall of the vacuum furnace; the incident window and the transmission window are arranged coaxially and collinearly; the axial line of the fluorescence window is vertical to that of the incident window and/or the transmission window; the heating device is arranged in the cavity of the vacuum furnace and is used for heating the fused salt test tube arranged in the heating device; an incident hole, a transmission hole and a fluorescence hole corresponding to the incident window, the transmission window and the fluorescence window respectively are formed on the heating device; the first ionization chamber corresponding to the incident window is arranged outside the vacuum furnace; the second ionization chamber or the CCD detector corresponding to the transmission window is arranged outside the vacuum furnace; and the external fluorescence detector corresponding to the fluorescence window is arranged outside the vacuum furnace.

The invention discloses high-carbon-chromium bearing steel and a manufacture method thereof. The high-carbon-chromium bearing steel comprises the following chemical compositions by weight percentage: C: 0.90-1.05; Cr: 0.90-1.20; Mn: 0.90-1.25; Si: 0.45-0.75; Al: 0.02-0.04; oxygen is less than or equal to 0.0007; phosphorus is less than or equal to 0.010; sulfur is less than or equal to 0.005; titanium is less than or equal to 0.0025; copper is less than or equal to 0.15; nickel is less than or equal to 0.10; nitrogen is less than orequal to 0.0070; and the balance of unavoidable impurities and Fe. The manufacture method comprises the following steps: smelting in an electric furnace, refining in a ladle arc furnace, degassing in a vacuum furnace, pouring steel liquid into steel ingots, heating steel ingots in a heating furnace, rolling the steel ingots into square billets by a rolling mill, heating the steel ingots in a heating furnace and rolling the steel ingots into round steel by a rolling mill. Compared with the prior art, the invention has high hardenability, high crystal grain size of more than 8 grade, high commonality in technology and wide application.

The invention discloses a method for manufacturing carbon/ceramic braking linings used in an industrial brake, which comprises the following steps: carbon fiber performs are prepared by a needle method; low-density C/C composite material is prepared by a chemical gas permeation method after the carbon fiber performs are treated in high temperature; the C/C composite material is treated in high temperature, machined and then the molten silicon infiltration is carried out on the C/C material in a high temperature vacuum furnace; Sic is formed by the Si and C reaction to prepare C/C-SiC baking material; and finally after the C/C-SiC baking material is machined, the C/C-SiC baking material is riveted with the steel backing by a rivet in a cold way to prepare the needed C/C-SiC baking material used in an industrial brake. The carbon/ceramic braking lining manufactured by the method has higher mechanical property and excellent frictional wear performance and is used in the industrial brake.

The invention relates to a high-toughness cadmium-free silver solder and a preparation method thereof. The solder comprises the following materials by weight percent: 22-58 percent of Ag, 15-35 percent of Cu, 13-38 percent of Zn, 4-8 percent of Mn, 1.5-5 percent of Ni, 0.8-3 percent of Co, 0.01-0.45 percent of B, 0-1.5 percent of V, 0-1.5 percent of Nb, 0.005-0.9 percent of Ce, 0.005-0.9 percent of La and 0-0.5 percent of Sr. The preparation method comprises the following steps of smelting the metal with high-melting point and partial copper into a preliminary alloy A, smelting oxidized metal and partial copper in a vacuum furnace into a preliminary alloy B, smelting silver and the remained copper in an intermediate-frequency furnace and then adding the preliminary alloy A, adding metals of manganese and zinc and then adding the preliminary alloy B after complete fusion, fusing completely again and standing for 60 minutes, and casting to form a silver alloy ingot, performing even annealing and scaling on the alloy ingot, extruding the alloy into a stripe shape or a bar shape by an isothermal extrusion method, and then rolling into a band or drawing and reducing to a filament.

The invention discloses a method for preparing a magnesium metal and a by-product by vacuum carbothermic reduction with serpentine minerals. The method comprises the following steps: using serpentine mineral powder as a raw material; adding a carbonaceous reducing agent which is 1 to 2 times of the theoretical quantity of carbon required for completely reducing magnesium silicate in the serpentine; adding a catalyst, and mixing the materials evenly to obtain a mixed raw material; pressing the mixed raw material into spherical or blocky ball agglomerations and drying the ball agglomerations; putting the dried ball agglomerations into a vacuum furnace, controlling the vacuum degree in the furnace to between 10 and 500 Pa, raising the temperature to between 500 and 700 DEG C, and keeping the temperature for 20 to 60 minutes to remove crystal water and clinker the materials; keeping the vacuum degree in the furnace, raising the temperature to between 1,200 and 1,500 DEG C, and reducing the magnesium silicate and oxides of metallic iron and nickel at a constant temperature for 30 to 60 minutes; and condensing magnesium vapor obtained from the reduction on a magnesium condenser into crystallized magnesium, recycling the metallic iron and the metallic nickel in the slag through magnetic separation, and preparing the slag after the magnetic separation into industrial silicon carbide through decarburization and purification.

The present invention relates to a superplastic forming method for the titanium plate specially used for the plate type heat exchanger, which belongs to the field of mechanical processing technology. The present invention comprises the following steps that spongy titanium is chosen to be the melted raw material; the spongy titanium is placed in a vacuum plasma smelting furnace to be directly cast into plate base; the plate base forms a plate of a thickness of 2.0 to 2.4 mm after the process of heating, hot rolling, acid and alkali washing; second heating, hot rolling and acid and alkali washing and annealing; the plate of a thickness of 2.0 to 2.4 mm after the annealing in the vacuum smelting furnace forms a titanium plate of a thickness of 0.5 to 0.6 mm after the process of cold rolling, cleaning, second annealing and cold rolling, acid and alkali washing and third annealing. The present invention adopts the process that the spongy titanium which contains oxygen, iron and nitrogen of comparatively high content is directly processed into the titanium plate base in the plasma smelting furnace and directly rolled into the plate without forging and pressing.

A diffusion soldering method for making the jointing strength of copper-aluminium joint high is disclosed. Place the flaky Al-Si-Mg solder (after being removed oxide film from the surface) between the faces to be welded of the copper plate and the aluminium plate folded each other which are clamped by stainless steel plate and put into the vacuum furnace to conduct vacuum soldering. The craftwork parameter as follows: programming rate: 10-20 deg.C/min, when the temperature raises to 300-350 deg.C and 510-540 deg.C, keep the temperature 5min respectively, then continues to rise the temperature to 616-624 deg.C, and keep the temperature for 4-6 minutes. The invention realizes high reliability joining of copper and aluminum, good interface of composite plate, good sealing performance and smooth beauty joint part. The shear strength of the interface is 60Mpa and the tensile strength of the interface is more than 100Mpa.

The invention provides a preparation method of a high temperature oxidation-resistant coating on the surface of a carbon/carbon composite material. The preparation method comprises placing Si powder, C powder, and Al2O3 into an agate ball milling tank, adding distilled water, mixing and ball milling, taking out the mixed solution, and drying to form inner layer embedded powder; placing the treated C/C composite material into the powder in a graphite crucible; placing into a vertical type vacuum furnace with graphite being the heating body for preparing an undercoat; mixing the Si powder, Mo powder, W powder and C powder with absolute ethanol and silica sol to obtain slurry; and uniformly brush coating surface of the SiC inner layer of the C/C composite material I with the slurry, drying, and placing into an alumina crucible for preparing a top coating. The antioxidant protective time of the C/C composite material is increased from 100 hours in prior art to 200-252 hours in 1500 DEG C air using high temperature oxidation resistance of MoSi2 and WSi2 via combination of the undercoat and the top coating.

The invention discloses a making method of aluminium-based composite material, which comprises the following steps: fusing the aluminium based alloy at 750 deg. c; adding the alloy into 0. 15-0. 35wt% CeO2 powder; stirring; alloying; insulating; adding reinforcer during insulating to stir; transmitting the material into vacuum furnace to degas; casting; making the aluminium based material; selecting carbon fiber as the base of reinforcer; metalizing the surface; setting the quantity of reinforcer as 3-5% as carbon fiber.

The invention pertains to the technical field of non-metal refractory materials, which relates to a magnesia chrome carbon coating and a preparation method thereof. The magnesia chrome carbon coating is researched and developed by taking waste magnesia carbon bricks as raw materials. The proportioning ratio of the waste magnesia carbon bricks is more than 65 percent, thereby increasing the recycling quantity of the waste magnesia carbon bricks and lowering the production cost of the magnesia chrome carbon coating. The magnesia chrome carbon coating can be used as the coating of continuous casting tundish working lining and as the patching material of the lower groove working lining of an RH vacuum furnace. The magnesia chrome carbon coating made from the components can bear the erosion and scouring of high-temperature molten steel (1550 DEG C to 1650 DEG C) for more than 24 hours and has good resistance to erosion, scouring and oxidation.

The method for synthesizing NiTi marmen porous body material is characterized by that it uses Ti powder and Ni powder as raw material, and includes the following steps: uniformly mixing the above-mentioned raw materials, mixing them with adhesive in mixing machine, granulating to obtain feeding material, injecting to obtain blank piece, soaking said blank piece in gasoline to remove grease, drying and placing the blank into vacuum furnace to make thermal grease removal, finally connecting one end of blank with W spiral in flame igniter, placing it into vacuum reaction synthesizer, when the degree of vacuum is higher than 1X10(-2)Pa, starting heating, after the temp. is up to defined value, starting flame igniter so as to produce self-spreading high-temp. synthesis reaction to obtain finished product.

The invention relates to a method for separating tin from tin-lead-stibium-arsenic alloy by vacuum distillation, belonging to the technical field of vacuum metallurgy of non-ferrous metals. The method comprises the following steps: melting the tin-lead-stibium-arsenic alloy to obtain tin-lead-stibium-arsenic alloy liquid at first; and continuously and uniformly feeding the obtained tin-lead-stibium-arsenic alloy liquid into a continuous vacuum furnace by adopting a constant-current feeding method to carry out vacuum distillation so as to obtain residues, namely crude tin or tin-lead-stibium alloy and tin-lead-stibium-arsenic metal vapor entering a condenser, and controlling the temperature of the condenser and the condensation section number according to the concentration of tin vapor in the tin-lead-stibium-arsenic metal vapor, thereby obtaining tin-lead-stibium alloy, lead-stibium alloy and crude arsenic. According to the method, a tin-lead-stibium-arsenic alloy raw material is directly separated by adopting the continuous vacuum furnace; the universality to raw materials is higher; the lead-stibium alloy with the tin content less than 0.2wt%, the crude tin with the tin content above 98wt% and crude arsenic with the arsenic content above 90wt% can be obtained; and therefore, high-efficiency separation of the tin-lead-stibium-arsenic alloy is realized.

The invention relates to a method for multilevel vacuum distilling and separating tin-lead alloy, comprising: three-stage vacuum distillation is carried out on raw tin-lead alloy in a vacuum furnace, one-stage distillation temperature is controlled to be 900 DEG C-1050 DEG C, the vacuum degree is 0.1Pa-0.5Pa, and distillation lasts for 10-20min; two-stage distillation temperature is 1100 DEG C-1250 DEG C; and three-stage distillation temperature is 1100 DEG C-1250 DEG C. The lead content in the obtained refined tin product is less than 0.005%, the direct yield coefficients of metallic tin and lead are more than or equal to 98%, and the range of lead content in the raw material is required to be expanded to be 7%-95%, so that the application scope of processing equipment for the raw materials can be enlarged.

The invention relates to a copper and stainless steel brazing process, which is characterized by comprising the following steps of 1) processing before brazing; 2) assembling joints; 3) adding brazing filler metal and brazing flux; 4) brazing; and 5) processing after brazing. Since silver-base brazing filler metal is replaced by copper-base brazing filler metal in the process, manufacturing cost is reduced and noble metal resources are saved greatly. Brazing is realized in the air without protective gas so that expenses for consumption of nitrogen gas, argon gas and the like are reduced. Due to the fact that the technology of brazing in a protective gas furnace or vacuum furnace is replaced by the technology of brazing by induction heating, electric power is saved. Accordingly, the copper and stainless steel brazing process is reliable, requires short production time, enables pass rate to be high, saves energy sources and is suitable to be used for batch production.

The invention relates to a biomedical beta-titanium alloy material with low elastic modulus. The preparation method for the material comprises the steps of raw material preparation, raw material smelting, cogging, forging and the like, namely the method comprises the following steps: preparing a raw material alloy of Nb, Zr, Sn, Ta, Mo and Ti according to a certain proportion, mechanically stirring and mixing the alloy, then pressing the alloy on a hydraulic press to form electrodes, and later smelting the electrodes in a vacuum consumable electro-arc furnace to obtain cast ingots of the beta-titanium alloy material; taking out the cast ingots with certain diameter, heating the cast ingots in a vacuum furnace and then preserving the heat, upsetting and drawing out the heated cast ingots on the hydraulic press or a forging device, and repeating the step twice to thrice to obtain a forging stock of the beta-titanium alloy material; heating the forging stock in the vacuum furnace and then preserving the heat, drawing out the heated forging stock on the hydraulic press or the forging device to obtain the biomedical beta-titanium alloy material with the elastic modulus E of 50 to 80GPa. The alloy has the characteristic of low elastic modulus, has good combination properties such as tensile strength, yield strength, corrosion resistance and the like, and does not contain toxic elements to human body.

The invention discloses a ceramic grid enhanced metal matrix composite perform and a preparation method thereof. The preparation method comprises the following steps of: uniformly mixing ceramic particles with the particle sizes of 8-30 meshes and self-fluxing alloy powder in polyvinyl alcohol to obtain a mixture; filling the mixture in a grid cavity, prepressing for preparing ceramic grids, filling the self-fluxing alloy powder into grid holes after the grids leave from a mold, wherein the monolithic material is pressed with 100-300 kilogram force, molding and demolding, placing and drying a biscuit and a mold cavity bottom plate in a 150 DEG C drying oven for 2 hours; placing the dried biscuit and the mold cavity bottom plate in a vacuum furnace, sintering for 30-90 minutes under the conditions that the temperature is 1000-1300 DEG C, and the vacuum degree is 0.1 Pa, and cooling and discharging to obtain the ceramic grid enhanced metal matrix composite perform. The ceramic grid enhanced metal matrix composite perform prepared by the method has the advantages of high density, uniform distribution of ceramic particles, good wear resistance and high grinding efficiency.

The invention relates to a method and a device for preparing uniform solidified particles by orifice injection, which belong to the technical field of high-melting-point micro-particles and particularly relates to a method for preparing uniform solidified particles by orifice injection. The method comprises the following steps of: smelting a raw material in a crucible with a central hole by using a heater; inputting a pulse signal with a certain waveform to piezoelectric ceramics; driving a piston rod to move downwards and extrude a melt by the piezoelectric ceramics; injecting the melt from an orifice of a bolt with an injection orifice to form liquid drops; and freezing the liquid drops in an annular descending pipe to form the uniform solidified particles. A vacuum furnace and a collecting cabin in the device are fixedly connected with each other through a left bracket and a right bracket; the vacuum furnace is communicated with the middle of the collecting cabin through the annular descending pipe; and the vacuum furnace consists of a furnace body and a furnace door. Various micro-particle materials which have uniform sizes, accordant textures, high sphericity and controllable sizes and meet requirements can be prepared skillfully for materials with different high melting points. The method has the advantages of high efficiency, simple device and energy conservation.

The invention discloses a preparation method of normal pressure-sintered silicon carbide ceramics, which adopts a solid normal pressure sintering method and takes submicro silicon carbide powder, graphite powder and boron carbide powder as main materials. The method comprises the following steps: 1) material grinding is carried out by adopting a staged ball milling mode, firstly, the main raw materials are ball-milled by adding water under the environment of the pH value being 10-12 to lead the agglomerated silicon carbide micro powder and other main raw materials to be evenly dispersed; then a plasticiser, a lubricant and water soluble phenol resin are added and ball-milled for a period of time; and finally a caking agent is added for ball milling; 2) spray granulation technology is adopted for carrying out granulation on the silicon carbide slurry; (3) the materials after granulation are maintained under constant temperature and humidity; (4) double-sided compression moulding is carried out on the maintained materials; (5) a staged drying mechanism is adopted for drying the molded body; and (6) the silicon carbide body is put in a vacuum firing furnace for being subjected to two times of sintering by taking the argon as protective gas. The silicon carbide ceramics prepared by the method have superior performance, corrosion resistance and long service life, and are applicable to commercial process.

The invention discloses a preparation technology of a TC17 titanium alloy wire. The preparation technology is characterized by comprising the following steps of: rolling the TC17 titanium alloy into a disk with specification of (Phi)12mm; performing three times of grinding on the (Phi)12mm disk; after the grinding and when the total working rate reaches 30%, performing heat treatment and stress relief annealing in an electric furnace or a vacuum furnace; when the diameter of the wire is greater than or equal to (Phi)10mm, controlling the stretching temperature at 780+/20 DEG C; when the diameter of the wire is less than (Phi)10mm, controlling the stretching temperature at 730+/-20 DEG C; repeatedly performing annealing-stretching-grinding-annealing of the wire after the heat treatment until the diameter of the wire is greater than or equal to (Phi)5.5mm, and performing vacuum heat treatment; before obtaining the finished product and after performing the vacuum heat treatment, removing the lubricant and scale impurity layer on the material surface by use of a round-blade mould with 0-5 degrees of internal and external taper angles according to the diameter of the finished product, stretching to obtain a bright wire with diameter of less than or equal to (Phi)5.0mm, and checking the finished product; and if the finished product is qualified, delivering as the finished product. The preparation technology disclosed by the invention makes up for the shortcoming that the TC17 titanium alloy wire cannot be produced domestically.