40 results about "Heat treating" patented technology

The invention provides a high-tenacity polycrystalline composite material. The high-tenacity polycrystalline composite material particularly comprises, by mass, 72%-92% of polycrystalline super-hard phase, 7.5%-25% of binding agents and 0.5%-15% of toughening agents. The toughening agents are one of aluminum oxide whiskers, silicon nitride whiskers, silicon carbide whiskers, carbon nano tubes and graphene or the combination of several of the aluminum oxide whiskers, the silicon nitride whiskers, the silicon carbide whiskers, the carbon nano tubes and the graphene. The invention further provides a high-tenacity polycrystalline blade prepared from the high-tenacity polycrystalline composite material and a preparation method of the high-tenacity polycrystalline blade. The preparation method comprises the steps of isostatic forming, vacuum heat treatment activation, and high-temperature and high-pressure sintering. The high-tenacity polycrystalline blade has good tenacity and cutting performance, and the preparation technique is simple and easy to implement.

A method for preparing a silicon carbide ceramic material with low residual silicon by adopting a multi-step reaction sintering method comprises steps as follows: carbon sources are selected, the carbon sources with different activity degrees are mixed with silicon carbide powder, phenolic resin or PVA (polyvinyl acetate) is added, the materials are mixed and subjected to powder forming, siliconizing sintering and heat treatment for removing residual silicon, finally, an obtained silicon carbide product is polished, carbon and silicon condensed on the surface are removed, the coarse surface is flattened, and a qualified silicon carbide finished product is obtained. According to the method, the problem that application of a conventional reaction sintered silicon carbide ceramic material in high temperature and corrosion environments and a high temperature difference environment is limited due to higher content of residual silicon is solved, the silicon carbide ceramic material with low residual silicon and high density can be prepared, heat-conducting property, high-temperature mechanical property, Young modulus, corrosion resistance, high-temperature conductivity and other properties of the reaction sintered silicon carbide material are greatly improved, and the application range of the reaction sintered silicon carbide material is greatly enlarged.

The invention relates to a novel process for precision forging of a disc steering knuckle, which comprises sawing, heating, blanking, forging, trimming, aligning and heat treating, wherein a forging procedure refers to the precision forging carried out by a hot die forging press. The precision forging comprises the following steps of: upsetting and descaling, semi-closed type extruding and preforming of a rod part and a head part, preforging and forming of a head part and a rod part, and finish forging and finishing. The process has the advantages that the process for the precision forging of the disc steering knuckle is advanced, the precision of a product can conform to the precision rank specified in national standard, the quality of a forge piece is stable, and the production efficiency is high.

The invention relates to a method for improving the durability of a GH3536 alloy manufactured by a selective laser melting technology, and belongs to the technical field of alloy melting. The heat treatment process of the GH3536 alloy is adjusted, the heat treatment process of the alloy is optimized, so that the typical high-temperature endurance performance of the alloy is achieved, and the method has great significance in the SLM technology and alloy application. The method has the beneficial effects that the typical high-temperature endurance property of the GH3536 alloy prepared by the SLMcan reach the forging standard, and the anisotropy of the endurance property of the alloy caused by the non-uniform structure of the alloy prepared by the SLM is eliminated.

The invention discloses a special-steel-material flexible wheel of a harmonic reducer, and a cyclic heat treatment method thereof. The cyclic heat treatment method comprises the three steps of carrying out normalizing heat treatment, rough machining and thermal refining; the isothermal annealing operation is cancelled; the normalizing heat treatment comprises the following concrete steps of feeding a forged flexible wheel workblank into a heating furnace, adjusting the normalizing induction heating temperature to range from 880 DEG C+/-20 DEG C, heating and insulating for 45min, and continuously carrying out normalizing heat treatment for two times; and the thermal refining comprises the following concrete steps of feeding a roughly machined flexible wheel workblank into the heating furnace, adjusting the quenching induction heating temperature to range from 850 DEG C+/-20 DEG C, insulating for 45min, then oil quenching, adjusting the tempering induction heating temperature to range from 560 DEG C+/-20 DEG C, insulating for 90min, and carrying out thermal refining for 1 to 3 times according to the flexible wheel grain size number requirement. The special-steel-material flexible wheel of the harmonic reducer, and the cyclic heat treatment method thereof provided by the invention have the beneficial effects that after the cyclic heat treatment method provided by the invention isadopted to treat the flexible wheel made of the special steel material (medium-carbon high-strength quenched and tempered steel), the original austenite grains of the flexible wheel can be refined andhomogenized.

A method of producing a magnesium fluoride coating includes a step of forming a coating by applying a solution containing a fluorine-containing organic magnesium compound represented by the following formula to a base and a step of heat-treating the coating while the coating is being irradiated with a beam of light with a wavelength of 246 nm or less:

Mg(CF₃—X—COO)₂  (1)

wherein X represents a single bond or one of —(CF₂)_n—, —(CH₂)_m—, and —CH₂CF₂— that may have a substituent, where n and m each represent an integer of 1 to 4. The temperature of the heat-treating step can be 250° C. or lower. The coating can be irradiated with a beam of light with a wavelength of 185 nm or less.

The invention belongs to the aluminum alloy manufacturing technology field and relates to a manufacturing method of an aluminum alloy three-layer composite material for brazing. The method mainly comprises the steps of component proportioning of a brazing layer, fusion casting, saw cutting, surface milling, hot rolling, proportioning of a base body layer, fusion casting, saw cutting, surface milling, surface treatment of the two, seaming assembling, heating, hot rough rolling compounding, hot finish rolling, cold rolling, withdrawal and straightening cleaning, finished product annealing, slitting and packaging. Through a component optimization design, strength of a composite material and anti-sagging performance after high-temperature brazing can be improved, meanwhile, balance between mechanical performance and corrosion performance is guaranteed, and a brazing requirement of controllable gas shielded welding can be well satisfied. A two-stage heating mode of homogenizing heat treatment and hot rolling heating is performed at the same time after a brazing material and a matrix cast ingot are combined so that production efficiency can be greatly improved, energy consumption is reduced and product performance requirements are satisfied.

The invention discloses a method for applique on a fabric. The method comprises the following steps: a) mapping preset patterns on the front surface of a fabric, wherein the patterns are required to be subjected to laser cutting on the fabric, and comprise at least a closed shape outline line; b) arranging an adhesive film with an adhesion on the back surface of the fabric, wherein the position is correspondingly matched with the pattern mapping position; c) carrying out a heat treatment on the adhesive film, such that the matching part of the adhesive film adhesion and the pattern position is closely adhered to the back surface of the fabric; d) according to the pattern, carrying out laser cutting on the fabric and the adhesive film to form a hollow pattern corresponding to the pattern; e) removing the adhesive film; f) covering a second fabric on an adhesion-remained position after removing the adhesive film; and g) carrying out a post-treatment. With the present invention, the problem that the complex pattern and the fabric are difficultly combined is effectively solved, and the adhesion is adopted to replace sewing, such that the fabric and the second fabric are rapidly adhered so as to improve efficiency and avoid the follow-up treatment on the sewing residue.

The present invention discloses the structure and making process of treating electric pliers operating on high frequency capacitance field. The electric pliers have metal mouth in open-mouthed thin-wall structure formed through punching and drawing; and pliers body made through the technological process of cutting plate, hemming, drawing, cutting edge, heat treatment and grinding. The present invention has simple machining process, high production efficiency, high material utilization and low power consumption.

The invention discloses a preparation method of a hydrogenation catalyst. The preparation method comprises the following steps: mixing original clay with a weak acid and a dispersant, then carrying out a hydrothermal treatment on the mixture so as to obtain modified clay; using an acidic solution containing aluminum and an alkaline solution containing aluminum to carry out a flue-forming reaction in the modified clay slurry through a combined method of a pH swing method and a parallel-flow method; after the glue-forming process, carrying out processes of filtering, washing, and drying so as to obtain alumina dry glue, then subjecting the alumina dry glue to processes of forming, drying, and burning so as to obtain the catalyst carrier, and loading a hydrogenation active metal component on the catalyst carrier so as to obtain the hydrogenation catalyst. The catalyst prepared by the method mentioned above has the advantages of concentrated pore distribution and proper acidity, and is especially suitable for preparing a coal tar hydro-upgrading catalyst.

Disclosed is a heat treatment process for lowering the yield ratio of ultra-high-strength marine steel. Critical temperature quenching and high temperature short time tempering are adopted to obtain the low-yield-ratio ultra-high-strength marine steel, that is to say, the quenching temperature is Ac3+/-20 DEG C, the heat preservation time for quenching is 1.4-1.8 min/mm, the tempering temperature is Acl-(80-150) DEG C, and the heat preservation time for tempering is 0.5-2.0 min/mm. According to the heat treatment process, under the circumstance that matching of the strength and toughness of a steel plate is ensured, the yield ratio of the ultra-high-strength marine steel is significantly lowered, thereby completely meeting the requirements of a ship structure, an ocean platform, etc. which need the ultra-high-strength marine steel of the 420 MPa-690 MPa level or above the 690 MPa level.

The invention discloses a method capable of improving the explosive welding weldability of a large-thickness high-strength alloy. A substrate and a flying plate which can be subjected to heat treatment and enhanced obviously are subjected to explosive welding; the lower limit of an explosive welding window can be effectively reduced through a soft section, the problems that when the large-thickness high-strength alloy is directly used for explosive welding, the welding window is small, and the upper limit of explosive welding is reduced are solved, and weldability is enhanced; and by means of flying plate deformation in the explosive welding process, the heat treatment temperature can be reduced, the precipitation process can be effectively promoted, and the high performance can be easily obtained in the subsequent heat treatment process. In addition, if the soft flying plate is used, the torque needing to be overcome is small, in the explosive welding process, under the same requirement for the collision speed, the explosive load required by the soft flying plate is small obviously, and therefore the explosive usage quantity required in the explosive welding process is small, and greater environment protection is achieved. The performance of a composite obtained after explosive welding can be continuously adjusted within the required range according to the service conditions and the usage requirements.

The invention belongs to the technical field of heat treatment of steel and iron materials, and particularly relates to a continuous spheroidizing annealing method for high-carbon chromium bearing steel round steel. The method comprises the steps that high-carbon-chromium bearing steel round steel in a hot rolling state is loaded into a roller hearth type continuous annealing furnace to be heated, the heating time is 3-3.5 h, and the heating rate is 200-250 DEG C/h; after heating to 790-810 DEG C, keeping the temperature for 3.5-4 hours to finish primary isothermal treatment; cooling treatment is carried out, rapid cooling is carried out to 710-730 DEG C, heat preservation is carried out for 6.5-7 h, and then secondary isothermal treatment is carried out; after secondary isothermal treatment, furnace cooling is carried out to 600-650 DEG C, then furnace discharging and air cooling are carried out to room temperature, and continuous spheroidizing annealing treatment is completed; after annealing, the Brinell hardness of the high-carbon chromium bearing steel is 180-200 HBW, the total decarburized layer depth is smaller than or equal to 0.8% of the nominal diameter, the spheroidized structure is 2.0-3.0 grades, the uniformity is good, and necessary structure preparation is made for obtaining good comprehensive performance.

The invention provides a method for preparing a lithium battery negative electrode by compounding silicon, carbon and silicon dioxide in an extruder, which comprises the following steps: carrying outmixed heat treatment on nano silicon powder and nano silicon dioxide to obtain silicon monoxide steam, introducing the silicon monoxide steam into a twin-screw extruder by using a flow guide pipe, then respectively adding graphite powder, CMC, SBR, CTAB, PTFE and paraffin powder into the twin-screw extruder for mixing and extrusion, and then screening the extruded powder through a screen at a discharge port to obtain the product. According to the method provided by the invention, the silicon monoxide steam, the graphite powder and other auxiliaries are mixed and extruded in the screw extruderto obtain the effectively coated silicon monoxide/carbon negative electrode material, so that the volume effect of the silicon-based negative electrode material in use can be effectively avoided, andmeanwhile, the whole preparation process is simple and controllable; and the problems of high equipment requirement and complex preparation process in the original process are solved, and the method has a wide application prospect.

The invention provides a method for eliminating resin film, i.e., a method for eliminating a resin film adhered to a glass plate, said method comprising a heat treatment step for heat treating a resin film adhered upon a glass plate and a washing step for washing away the heat-treated resin film. During the heat treatment step, the surface on the reverse side of the glass plate from the resin film is exposed to the atmosphere at a temperature of 300-450 DEG C, an inert atmosphere at a temperature of 350-600 DEG C or to water vapor at a temperature of 150-350 DEG C.

The invention relates to an assembling and welding method for a truss layer corner column, which comprises the following steps of: respectively welding box type forgings with box body end heads, and preheating welding positions before welding by adopting an electric heating method; a jig frame is erected according to the assembly inclination of the box type forge piece and the brackets and the requirements of a design drawing, the inclination of a plate, used for supporting the brackets, at the topmost end of the jig frame is kept consistent with the inclination of the brackets, and the first bracket on the upper portion, the fourth bracket on the lower portion and the protruding position of the forge piece are assembled; a second bracket and a third bracket are assembled with the other two faces of the box type forge piece; and annealing treatment is conducted on the box body end and the welding seam of the bracket and the box type forge piece. According to the assembling and welding method, the welding seams of the components are planned, the phenomenon that the welding seams are too concentrated is avoided, meanwhile, the webs connected with the bracket flange plates are changed into the permeable webs, the thickness is small, discontinuous connection is achieved, the welding amount of the bracket is reduced, and materials and the manufacturing cost are also saved.

The invention provides a manufacturing method of a composite cutter bits. The manufacturing method comprises the following steps of smelting metal liquid of two metallic materials of deformed steel bar and 42CrMo; pouring the deformed steel bar metal liquid into a mold and cooling to solidify the deformed steel bar; pouring the 42CrMo metal liquid into the mold and then cooling to complete the compounding of the two metals; placing a copper sheet in a groove of a casting after compounding, and then placing an alloy head to be welded, heating the whole, fully melting the copper sheet, and welding the alloy head and the casting as a whole; and performing the subsequent heat treatment on the welded whole. The manufacturing method of the composite cutter bits provided by the invention fully considers that the coefficients of thermal expansion, the solidification shrinkage rate and the line shrinkage rate of various metals are similar, considers the influence of the subsequent heat treatment temperature on different materials, and the comprehensive performance of the manufactured cutter bits can meet the operation strength requirements of mechanical equipment such as a heading machine,a coal mining machine and the like.

The invention provides a reduced graphene/alpha-Fe2O3 supercapacitor material and a preparation method and application thereof. The preparation method of the reduced graphene/alpha-Fe2O3 supercapacitor material comprises the following steps: (1) dissolving Fe (NO3) 3.9H2O, CTAB, urea and graphene oxide dispersion in a methanol solution and performing hydrothermal reaction at 160-200 DEG C for 8-24h; (2) pumping and filtering the reaction product obtained in the step (1), adding the obtained solid and thiourea into water, uniformly mixing and transferring to a reaction kettle and performing hydrothermal reaction at 160-200 DEG C for 8-24 hours; and (3) pumping and filtering the product obtained in the step (2), freezing and drying and then performing heat treatment. The supercapacitor material is simple in preparation of the working electrode, and the electrochemical working window in the alkaline electrolyte is from -1.05 V to -0.3 V and the maximum specific capacity can be 1296 F/g so as to be an ideal negative electrode material. The shortcoming of low specific capacity of the negative electrode material of the supercapacitor can be overcome, the problem of mismatch between thepositive electrode and negative electrode specific capacity of the supercapacitor can be solved and thus the material has high research value.

The invention discloses a heat treatment method for an engine valve. The methodcomprises the following steps: 1, an engine valve sample is put into a furnace, and the sample is heated to 1150-1200 DEG C; 2, timing and heat preservation are conducted, and the heat preservation time is 3-10 min; and 3, after the heat preservation time is ended, the furnace is opened immediately, the sample is taken out, and cooling is carried out. According to the method, the solid solution heat treatment process parameters are reset, the solid solution temperature is increased to 1150-1200 DEG C, the influence of the temperature rising process on the structure change is reduced by shortening the solid solution heat preservation time, the problems of crystal mixing and uneven crystal grains at all positions of the high-temperature alloy material valve are solved, the high-temperature strength and durability of the product are improved, the overall heat treatment time is shortened, and the cost and the production scheduling pressure are reduced.

The invention belongs to the technical field of aluminum alloy machining, and particularly relates to a production method and system of an aluminum alloy coiled material/plate. The production method comprises the steps of uncoiling, first-time straightening, tension building before cleaning, cleaning and drying, tension building in front of a furnace, heating and heat preservation, cooling, deviation rectifying, tension building behind the furnace, second-time straightening, fixed-length cutting and the like of a non-treated aluminum alloy, according to the production method of the aluminum alloy coiled material/plate, through a roller bottom type air cushion furnace, an aluminum alloy strip with the thickness range being 1 to 20 mm is subjected to continuous heat treatment (solid solution, quenching or annealing treatment), a recoiling machine and a fixed-length shear on the same production line meet production of an aluminum alloy product in a coiled material and plate manner, and the production efficiency of the aluminum alloy coiled material/plate can be improved.

A manufacturing method of a high-manganese steel spectrum standard sample belongs to the technical field of standard sample preparation, solves the technical problems that the high-manganese steel spectrum standard sample is relatively high in price, low in yield and easy to generate analysis errors, and comprises the following steps: preparing materials and smelting, performing heat treatment, forging (upsetting and drawing out twice), and sawing and polishing to obtain the high-manganese steel spectrum standard sample. According to the high manganese steel spectrum standard sample manufactured by the method, the purchase cost is greatly reduced, the detection and analysis cost is reduced, the applicability is wide, the manufacturing is easy, and the economical efficiency is high. The forging procedure is added in the technological process, deviation of standard sample components is reduced, the product yield is increased, and accuracy is high. A smelting mode is optimized to be changed into a vacuum mode, so that the uniformity of standard sample components is improved, and the reliability is high. In a word, the high manganese steel spectrum standard sample prepared by the method can efficiently complete component detection work.