659 results about "Salt bath" patented technology

The invention discloses a method for producing tempered glass with a plurality of surface stress layers and a tempered glass product and particularly relates to a method for producing tempered lithium glass with a plurality of surface stress layers. The method comprises that a mixed salt bath is used for conducting ion exchange in a step, or various mixed salt baths are used for conducting several ion exchange in a plurality of steps. By the aid of the novel chemical tempered lithium aluminosilicate glass and the treatment method of relative glass products, glass with the plurality of surface stress layers and products of the glass are obtained, and the product serves as a high-strength cover plate in electronic devices, household appliances and vehicles. Compared with the prior art, the tempered glass with the plurality of surface stress layers can protect electronic devices, household appliances and vehicles reliably.

The invention relates to a steel wire rod for an 1860MPa-level bridge cable galvanized steel wire and a manufacturing method of the steel wire rod. The steel wire rod for the 1860MPa-level bridge cable galvanized steel wire comprises the following raw materials by weight percent: 0.81-0.90% of C, 0.70-1.60% of Si, 0.60-0.90% of Mn, 0.02-1.20% of Ni, 0.00-0.25% of W, 0.015-0.030 of Al, 0.00-0.70% of Cr, 0.00-0.15% of V, 0.002-0.006% of Ca, less than or equal to 0.015% of P, less than or equal to 0.015% of S and the balance of Fe and inevitable impurities, wherein the total quantity of the impurity elements is lower than 0.05%. For the steel wire rod and the preparation method of the steel wire rod, the steel wire rod is not required for salt bath processing, and can be produced by adopting conventional drawing technique, the finished steel wire after being drawn and galvanized has the strength higher than 1860MPa, has 14 times of torsion values, and can be applicable to the need for construction of extra big span bridge.

Ion exchangeable glasses having coefficients of thermal expansion (CTE) at least about 90×10⁻⁷ ° C.⁻¹. The glasses undergo rapid ion exchange, for example, in a molten KNO₃ salt bath to a depth of layer of greater than 30 microns in less than 2 hours at temperatures of 370° C. to 390° C. When ion-exchanged to a depth of layer between 30 to 50 microns, the glasses exhibit a Vickers median/radial crack initiation threshold exceeding 30 kilograms force (kgf). The glasses are fusion formable and, in some embodiments, compatible with zircon.

The invention relates to high-boron low-carbon wearproof cast steel and a heat treatment method thereof, which belongs to the steel material technical field. The cast steel comprises the following chemical compositions in percentage by weight (wt percent): 0.15 to 0.30 percent of C, 1.5 to 2.5 percent of B, 2.6 to 3.0 percent of Si, 1.4 to 1.8 percent of Cr, 0.5 to 0.8 percent of Mn, 0.05 to 0.12 percent of Ce, 0.03 to 0.15 percent of V, 0.03 to 0.15 percent of Ti, less than 0.05 percent of P, less than 0.05 percent of S, the balance being Fe, the content of v and Ti is more than 0.01 and less than 0.25. In the invention, a casting is kept between 880 DEG C and 920 DEG C for 1h to 3h, treated by isothermal quench in an isothermal salt bath furnace with the temperature between 250 DEG C and 300 DEG C, is kept for 2h to 4h and later cooled in the air to room temperature, thereby obtaining the high-boron low-carbon wearproof cast steel. Compared with the prior art, the cast steel and the technology of the invention have the advantages of good plasticity and toughness, high wear resistance , low cost, etc.

The present invention relates to a metal surface salt bath nitride nitriding heat treatment method which belongs to the metal part surface heat treatment technology field. The method is performed in the following technical process: first, loading and clamping: the metal part is hung and arranged in a charging basket; second, nitriding: the metal part hung and arranged in the charging basket is positioned in a nitriding furnace, heated and charged with nitriding salt for salt bath and nitriding, and heat is preserved for 30-80 minutes in the condition that the temperature is 540-570 DEG C; third, cleaning: the nitrided metal part is cleaned, and the water temperature is controlled at 60-80 DEG C; the nitriding salt in the nitriding working process comprises carbamide, potassium chloride or barium chloride, sodium carbonate, and K ₂ S, etc., according to the weight percentage, the composition of each component is respectively: 30-40 percent of carbamide, 20-28 percent of potassium chloride or barium chloride, 38-44 percent of sodium carbonate, and 0.0001-0.1 percent of K ₂ S, and the sum of the weight percentage of each component is 100 percent. The present invention has the advantages of smaller deformability, short time, high efficiency, and wide application range; and also can achieve the effect of reducing the cost obviously.

The invention is about the surface peening and greasing process of a long life shafting bearing. It can solve the shot life of the GCr15 steel rolling shafting bearing by the process of the traditional quenching and lonnealing. It includes: put the collar and the rolling element into the salt-bath furnace with the C-N seeping agent to treat for 2-4h in 600DEG C; Put the washed parts into the salt-bath hardening furnace to heat to 830-850DEG C, then to oil cooling, next to lonneal for 2h in 160-180DEG C; Polish. The invention can improve the antisticking, seizure resistance and the using life.

The invention provides a chrome alum rare earth multicomponent cementation borax salt bath penetration metal penetrating agent, and belongs to the surface strengthening technology of parts such as moulds. The chrome alum rare earth multicomponent cementation borax salt bath penetration metal penetrating agent is suitable for parts with surface abraded easily and strained easily, such as metal moulds. According to the chrome alum rare earth multicomponent cementation borax salt bath penetration metal penetrating agent, borax serves as basic salt, a vanadium supplying agent is V205 or V-Fe alloy, a chromium supplying agent is Cr2O3 or Cr powder, a reducing agent is Al powder or Si-Ca powder, activating agent is NaF or CaF, rear earth is Ce or Ce alloy, and the chrome alum rare earth multicomponent cementation borax salt bath penetration metal penetrating agent comprises, by weight, 65-80% of the basic salt, 5-10% of the chromium supplying agent, 5-10% of the vanadium supplying agent, 3-9% of the reducing agent, 3-9% of the activating agent, and 0.5-8% of the rear earth. Compared with a traditional vanadinizing process, under the conditions that the thickness is the same while the hardness is approximate, the coating can be prepared at lower temperature and within short time through a preparation method of the chrome alum rare earth multicomponent cementation borax salt bath penetration metal penetrating agent, and the chrome alum rare earth multicomponent cementation borax salt bath penetration metal penetrating agent has the advantages of being high in quality of the coating, long in service life, environmentally friendly, capable of saving energy, short in production cycle and the like.

The invention discloses an ADI piece with high toughness and high strength and a manufacturing method thereof. The ADI piece comprises the following elements by mass percent: 3.6% to 3.9% of C, 2.5% to 2.7% of Si, 0.2% to 0.3% of Mn, smaller than or equal to 0.03% of P, smaller than or equal to 0.012% of S, 0.2% to 0.25% of Mo, 0.6% to 0.8% of Cu, 0.5% to 0.8% of Ni and the balance of Fe. The ADI piece has the elongation of 12.5% to 14.5%, the impact toughness of 125 to 140J/cm2, and the tensile strength of 990 to 1080MPa. The manufacturing method comprises the steps of: smelting burden in an intermediate frequency electric furnace; pretreating melted iron for desulfuration and dephosphorization and then pouring into a casting mould to obtain a raw casting; preserving the temperature of 905 DEG C to 915 DEG C for 1.5 to 2 hours for austenitizing the raw casting; quickly quenching in a salt bath at 350 DEG C to 370 DEG C for isothermal quenching for 1 to 1.5 hours; cooling and washing to obtain the ADI piece. The ADI piece of the invention has high elongation, high impact toughness and higher tensile strength. In the pretreatment of melted iron, no new equipment is added. The technological parameter is reasonably designed and the manufacturing cost is low.

The invention discloses chemical tempered glass with a combined stress advantage as well as a preparation method and application thereof. When the chemical tempered glass is 0.4-1.5mm in thickness specification, and the planar pressure stress CS_F at an area which is 50 mu m below a surface depth meets: CS_F is greater than or equal to 215.24-230.61/(1+EXP((T-0.715)/0.203)). The chemical temperedglass disclosed by the invention has high-level deep layer stress and high drop-resistant strength, and is high in mechanical strength. The chemical tempered glass further has relatively low dielectric constant and dielectric loss. As the chemical tempered glass has the advantages, the application of the chemical tempered glass is effectively expanded. The chemical tempered glass is obtained by adopting a single binary ion exchange processing method, the chemical reinforcing method of the chemical tempered glass can effectively save the usage amount of salt bath, the reinforcing treatment process is simplified, the stability of chemical tempered glass performance is guaranteed, and the cost of production is lowered.

A new device is provided for the electrorefining of uranium in spent metallic nuclear fuels by the separation of unreacted zirconium, noble metal fission products, transuranic elements, and uranium from spent fuel rods. The process comprises an electrorefiner cell. The cell includes a drum-shaped cathode horizontally immersed about half-way into an electrolyte salt bath. A conveyor belt comprising segmented perforated metal plates transports spent fuel into the salt bath. The anode comprises the conveyor belt, the containment vessel, and the spent fuel. Uranium and transuranic elements such as plutonium (Pu) are oxidized at the anode, and, subsequently, the uranium is reduced to uranium metal at the cathode. A mechanical cutter above the surface of the salt bath removes the deposited uranium metal from the cathode.

The invention relates to a preparation method of diamond particle reinforced copper-based composite material parts with high volume fraction, belonging to the field of metal materials. The preparation method is characterized in that the composite material comprises copper or copper alloy, diamond particles and an intermediate layer, wherein the volume fraction of the copper or the copper alloy is 32-45 percent, and the volume fraction of the diamond particles and the intermediate layer is 55-68 percent. The preparation method comprises the following steps of: firstly forming a TiC-Ti composite thin plating layer on the surface of the diamond by adopting a vacuum salt bath plating method, then adding an appropriate amount of caking agent into modified diamond powder and pressing into a porous prefabricated blank according to the shape of the parts; and finally putting the porous prefabricated blank and the copper or the copper alloy into a vacuum condition together for carrying out pressureless infiltration treatment to obtain the diamond-copper composite material parts with high volume fraction and high density. The invention has the advantages that the diamond-copper composite material parts with high volume fraction and the complex shape can be directly prepared, and the composite material parts have high density, even tissue distribution and low production cost, and can realize large-batch production.

The invention relates to a high-strength and ductility durable type large-diameter 1960 MPa stage zinc-aluminum alloy coating steel wire for a bridge cable. A steel wire rod is an ultra-pure hyper-eutectoid steel high-carbon steel wire rod obtained after sorbite treatment (water bath, lead bath and salt bath), the strength of extension is larger than or equal to 1290 MPa, the area reduction rate is larger than or equal to 30%, and the elongation is larger than or equal to 10%; and the steel wire rod is drawn into a bright steel wire with the diameter ranging from 4.90 mm to 6.90 mm, then hot galvanizing zinc-aluminum alloy coating is carried out, and technological processes include lead bath degreasing, hot water washing, chlorohydric acid pickling, hot water washing, weak base washing, hot water washing, ammonium chloride and zinc chloride solvent plating assisting, hot-dip galvanizing-nitrogen smearing, zinc-aluminum alloy hot galvanizing, nitrogen smearing and wire collecting. The steel wire rod is subject to stabilization treatment, and the strength, the linearity, the relaxation rate and the steel wire axial homogeneity of the large-diameter ultrahigh-strength Zn95Al5 alloy coating steel wire are guaranteed.

The invention discloses a one-time heat treatment method of an integral high-speed steel cutter. The method comprises the following steps of: (1) removing oil; (2) baking: the cutter is uniformly baked at a temperature of between 150 and 250 DEG C; (3) preheating; (4) quenching: after the cutter is preheated, the edge is quickly immersed in a salt bath to perform quenching heating, wherein the salt bath heating temperature of a W18 cutter is 1,280+/-10 DEG C, the salt bath heating temperature of an M2 cutter is 1,220+/-10 DEG C, the quenching insulating time is calculated according to tz which equals to 40 plus delta D, after insulation is completed, the cutter is completely immersed in the salt bath to quickly heat the handle of the cutter, and the heating time depends on the size of the cutter; (5) cooling; (6) cleaning; (7) annealing; and (8) subsequently processing. According to the method, the requirements for the edge part and the handle part of the cutter can be simultaneously fulfilled only by one-time heat treatment, secondary heat treatment to the handle part is not required, so that the process period can be shortened, the production efficiency can be improved, and the energy consumption can be reduced.

The invention relates to the technical field of the brazing of amorphous filler metal, copper and copper alloy, and relates to Cu-P based amorphous filler metal and a preparation method thereof. The Cu-P based amorphous filler metal comprises the following compositions with the content in percentage by mass: 7.0 to 8.0 percent of P, 14.0 percent of Ni, 5.0 percent of Sn, 0.02 to 0.06 percent of Zr, 0.2 percent of Si, and the balance being Cu. The preparation of the Cu-P based amorphous filler metal adopts a fast solidification technology, and the prepared filler metal has bright and clean surface, smooth two sides, and good toughness. The melting temperature range of the filler metal is between 590 and 635 DEG C, and the temperature of the brazing is between 650 and 685 DEG C. The filler metal is applicable to the brazing of the copper and the copper alloy, and applicable brazing techniques comprise flame brazing, furnace brazing, gas-shielded brazing, salt bath brazing and the like. When the filler metal is adopted to perform the flame brazing to red copper, the wettability of the filler metal is apparently better than that of filler metals which has the same compositions and are prepared by the prior melting technology, and the shearing strength of a brazed joint is larger than 92MPa, so the filler metal has good application prospect.

The process of growing nanometer crystalline chromium nitride film directly on steel includes the first nitriding and the salt bath chromizing of the nitrided steel at 500-650 deg.c after being cooled to room temperature and surface washing. The salt bath fluid for salt bath chromizing has base salt comprising NaC l20-25 wt%,BaCl2 30-35 wt% and CaCl2 40-50 wt%; and effective components including Cr powder 10-20 wt% of the base salt, Fe powder 5-10 wt% of the base salt, CrCl3.6H2O 25-50 wt% of the base salt, and Si powder 5-10 wt% of the base salt. The process grows nanometer crystalline CrN film directly on steel, and the film has great base bonding force, effect of reducing friction, fast growing speed and high suitability of steel types.

The invention relates to a boron-containing high-silicon bainite wear-resistant corrosion-resistant alloy and a manufacturing method thereof. The alloy comprises the following chemical components in percentage by weight: 0.3-0.6% of C, 1.6-2.6% of Si, 0.6-1.0% of Mn, 0.6-4.0% of Cr, 0.3-0.5% of Mo, 0.3-0.5% of Ni, 0.3-0.5% of Cu, 0.1-0.3% of Ti, 0.05-0.1% of B, 0.05-0.15% of Ce, 0.05-0.15% of Nb, less than 0.04% of P, less than 0.04% of S and the balance of Fe. The manufacturing method comprises the following steps: carrying out electric-furnace smelting, carrying out secondary aluminum insertion deoxidization, putting on the bottom of a casting ladle to form a casting, austenizing the casting at 850-950 DEG C, keeping the temperature for some time, putting in a salt bath at 200-260 DEG C to carry out primary isothermal quenching, keeping the temperature for 5-10 minutes, carrying out secondary isothermal quenching in a salt bath at 260-400 DEG C, keeping the temperature for 0.5-4 hours, and cooling in air to obtain the wear-resistant corrosion-resistant alloy of which the austenite-bainite base is distributed with boride. The alloy is low in preparation cost and suitable for marine silt erosion and corrosion environments, has favorable comprehensive properties of toughness, wear resistance and corrosion resistance, and can be used for dredger cutter teeth, slurry pipelines, centrifugal-pump impellers, blades and the like.

The invention relates to a salt bath formula for treating a high-speed steel air conditioning compressor blade by salt bath nitriding treatment and a treatment method. The salt bath formula comprises the following compositions in percentage by weight: 15-25 percent of potassium cyanate, 5-20 percent of sodium cyanate, 3-10 percent of lithium carbonate, 8-20 percent of sodium carbonate, 10-40 percent of potassium carbonate and 1-10 percent of sodium chloride. The invention has the advantages that because Li ions and Cl ions are added in the formula, the melting point of salt bath is lowered, and nitridation can be carried out under lower temperature; the activity is favorable, and good appearance and good diffusion layer thickness can be achieved without introducing ammonia; and the K/Na concentration proportion is enhanced, and a white layer is not easy to form on the surface of a workpiece.

The invention relates to technology for manufacturing a cutting tooth for mining coal and minerals. The cutting tooth comprises a tooth body and a tooth tip, and the technology is characterized by comprising the following steps of: (1) pre-manufacturing the tooth body; (2) pre-manufacturing the tooth tip; (3) assembling the tooth tip and the tooth body; (4) cladding a wear-resistant layer on the surface of the tooth body of the assembled cutting tooth; (5) performing salt bath treatment and quenching treatment on the product in the step (4); (6) performing low-temperature tempering treatment on the quenched product; and (7) performing post-treatment on the tempered product so as to obtain the finished cutting tooth. The deformation and thermal effect of the cutting tooth treated by the treatment technology are extremely low, and the service life is prolonged by 5 to 6 times. Compared with the traditional cutting teeth, the cutting tooth with the wear-resistant layer on the surface of the tooth body has higher Vickers hardness, and through detection, the hardness is more than 1,800 and is far greater than the Vickers hardness of the traditional cutting teeth. Due to higher hardness, the service life of the cutting tooth is greatly prolonged.

The invention discloses a production process of a high-residual-stress valve spring. The process comprises the following steps of spring rolling, wherein 55CrSi or 50CrVA spring steel wire materials are adopted as a blank; isothermal quenching; salt bath tempering, wherein the temperature of a salt pool is controlled between 400 DEG C and 440 DEG C, and heat preservation is carried out for a period; cleaning and drying; spring grinding; chamfering, wherein the two ends of a semi-finished spring obtained after spring grinding treatment are chamfered, burrs are removed, and the assembling requirements of customers are met; shot blasting of two times, wherein rough blasting is carried for the first time, a high residual stress value is obtained, fine blasting is carried out for the second time, and a deep residual stress value is obtained; hot press shaping; subsequent settling. Therefore, the high-residual-stress valve spring is manufactured. According to the production process, residual tension in the spring rolling process can be eliminated, the original mechanical performance of the materials can be kept, the high and deep residual stress can be obtained in the shot blasting process, the valve spring can be applied to high-stress-amplitude occasions, and the miniaturization requirement of an engine is met.

The invention belongs to the research field of metal matrix composites and relates to a high thermal conductivity graphite whisker/copper composite and a preparation method thereof. The composite comprises two parts, namely matrix pure copper and plated reinforced phase high thermal conductivity graphite whisker, wherein the volume fraction of the pure copper is 40 to 70 percent, and the volume fraction of the plated graphite whisker is 30 to 60 percent. The composite adopts the following production process steps: firstly, the surface of graphite whisker is plated with copper or molybdenum byadopting a chemical plating or salt bath plating method, so as to form a plating with the thickness of 1 to 2 Mum; and secondly, the plated graphite whisker and copper powder are uniformly mixed in the proportion of (30 to 60) to (70 to 40), and then the mixture is sintered at 820 to 980 DEG C by adopting an SPS Spark Plasma Sintering powder metallurgic method, so as to prepare the graphite whisker/copper composite. The invention provides the preparation method of the graphite whisker/copper composite used in the electronic packaging field, and the graphite whisker/copper composite has the advantages of high thermal conductivity, controllable thermal expansion coefficient, high density, easiness in processing and the like, thereby meeting requirements in the modern electronic packaging field.