134 results about "Invar alloy" patented technology

A high intensity invariable steel and a production method for it's wire rod characterizes in taking Fe-36Ni alloy as the base added with W, V and C in the following weight percentage: C 0.15 to 0.40, Si is not greater than 0.60, Mn is not greater than 0.8, p is not greater than 0.025, S is not greater than 0.02, Ni: 34.0 to 42.0, co is not greater than 3.5, Cr is not greater than 0.5, Cu is not greater than 0.2, W: 1.5 to 5.0, v 0.3 to 1.2, Mo is not greater than 0.5, the rest is Fe and unavoidable impurities, W.V is greater than 1.5, c=0.9-1.3(0.033w+0.2V). The production method includes: 1, processing the steel ingot into rods then to wire rods (phi=10 to 15mm) 2, applying special twice cold processing deformation and hot process, the twice cold-draw deformations are 20-70%, 55 to 95% then they are hot processed under 450-750 DEG C.

The invention discloses a vapor plating metal mask plate prepared from a nickel-iron alloy. The metal mask plate is a nickel-iron alloy mask plate prepared by an electroforming process. The nickel-iron alloy material include two elements: nickel and iron, wherein the iron content is 40%-70%, and the nickel content is 30%-60%. With similar physical properties to invar alloy plates, the vapor plating mask plate provided in the invention has high surface brightness, high uniformity, and good surface quality, and has lower cost than the mask plate made from an invar alloy, so that the cost is saved. Meanwhile, the mask plate provided in the invention has a small linear thermal expansion coefficient, thus meeting the vapor plating requirement. In addition, the mask plate involved in the invention has the characteristics of high hardness and high magnetism.

The invention discloses a super-pure electro-slag remelting method for a super-invar alloy, which comprises the following steps of: a) preparing a self-melting electrode rod, namely performing vacuum induction melting on the components of the self-melting electrode rod of the super-invar alloy: 32 to 34 weight parts of Ni, 3.5 to 5.5 weight parts of Co and 60.5 to 64.5 weight parts of Fe, and casting to obtain a round rod, namely the self-melting electrode rod for electro-slag remelting; and b) performing electro-slag remelting, namely heating slag for electro-slag remelting, which is prepared from 40 to 85 weight parts of CaF2, 10 to 30 weight parts of GaO2 and 30 to 5 weight parts of Al2O3 into a melted state, pouring into a crystallizer, descending the self-melting electrode rod into the melted slag for electro-slag remelting, ensuring that liquid drops of the melted self-melting electrode rod pass through the melted slag layer and react with the slag, recrystallizing purified steel liquid at the bottom of the crystallizer to obtain an electro-slag ingot, forging to obtain a black rod, and performing solid solution and stabilization treatment to obtain the super-invar alloy. The purity of the super-invar alloy is improved, the structure is optimized, the thermal expansion coefficient is smaller, the processability of the alloy is improved, and the yield of a product is greatly improved.

Disclosed are an erosion agent capable of displaying the solidified dendritic structure of a Fe-36 Ni invar alloy and an erosion method of the erosion agent. The erosion agent includes 1 g-2 g of picric acid, 0.5 g-1 g of anhydrous cupric chloride, 50 ml-60 ml of absolute ethyl alcohol, 0.5 ml-1 ml of hydrochloric acid and 1 g-2 g of sodium dodecylbenzene sulfonate. The erosion method of the erosion agent includes the steps that the prepared erosion agent is heated to the temperature of 50 DEG C-60 DEG C, a processed sample with the downward polishing face is suspended in the heated erosion agent to be eroded for 20 s-30 s, the eroded surface is wiped with ethyl alcohol firstly after erosion is completed, and then the sample is slightly polished at the one fourth radius position of a polishing machine for 4 s-6 s so that a copper film generated on the eroded surface can be removed. According to the method, the operating procedure is simple, the erosion effect is good, and the solidified dendritic structure of an invar alloy can be observed quickly and clearly, so that the solidification condition corresponding to continuous casting is obtained, and technical bases are provided for optimizing the continuous casting process technologies.

The invention relates to a Invar alloy foil manufacturing method. It belongs to precious alloy field. The Invar alloy is Fe-Ni alloy with 35-37% (wt%) nickel. The manufacturing method is electro deposition. Electrolyte is sulfate system with low metal salt density. Buffer, complexing agent, brightener, auxiliary, and 304 stainless steel, I_r2; the distance of cathode and anode is 10-30mm; the electro deposition time is 5-50min. and it includes the following steps: putting cathode in electroplating solution; electrifying direct current for curtain time; depositing Invar alloy on the cathode; taking it out; cleaning; drying; peeling off the formed Fe-Ni alloy layer to form Invar alloy foil.

The present invention relates to an electrolyte for producing a novel Fe—Ni alloy having an Ni content in a range of 33 to 42 wt %, specifically a nanocrystalline invar alloy having a grain size of 5 to 15 nm, by electroplating, and preparation conditions thereof. The electrolyte comprises, on the basis of 1 L of water, 32 to 53 g of ferrous sulfate or ferrous chloride, a mixture thereof; 97 g of nickel sulfate, nickel chloride, nickel sulfamate or a mixture thereof; 20 to 30 g of boric acid; 1 to 3 g of sodium saccharin; 0.1 to 0.3 g of sodium lauryl sulfate; and 20 to 40 g of sodium chloride. The Fe—Ni alloy sheet of the present invention exhibits excellent mechanical property compared to the conventional Fe—Ni alloy and a new property, i.e., a negative coefficient of thermal expansion at a given temperature range.

The invention belongs to the technical field of welding, and relates to a silver-copper-indium-titanium brazing filler metal used for connecting SiO2f/SiO2 composite ceramics and metals (such as tungsten, molybdenum, tungsten-molybdenum alloy, niobium, niobium-molybdenum alloy, invar alloy and kovar alloy). The silver-copper-indium-titanium brazing filler metal is characterized by comprising, by weight percentage, 19.2-28.2% of Cu, 8.2-19.4% of In, 3.5-7.2% of Ti, and the balance Ag. The brazing filler metal is good in machinability, and can be machined into strips, and required brazing temperature is lower than that of a traditional Ag-Cu-Ti brazing filler metal by about 100 DEG C, so that the silver-copper-indium-titanium brazing filler metal has a great significance in the field of ceramic and metal brazing connection in the aspect of reducing post-welding residual thermal stress of joints. The brazing filler metal not only is suitable for connecting the SiO2f/SiO2 composite ceramics and metals, and is also suitable for connecting ceramics, or connecting ceramics and metals, or connecting metals owing to excellent activity of the brazing filler metal.

The invention discloses a high-strength and low-expansion hot-rolled invar alloy. The high-strength and low-expansion hot-rolled invar alloy comprises, by weight, 0.1%-0.4% of C, 34%-42% of Ni, 1.5%-5.5% of Mo, 0.002%-0.03% of N, 0.015%-0.04% of Al, 0.005% or less of S, 0.005% or less of P, one or more of 0.01%-0.4% of Nb, 0.005%-0.55% of V and 0.02%-0.2% of Ti, and the balance Fe and inevitable impurities. According to the alloy, the content of S and the content of P are controlled strictly; the content of nitrogen in the alloy is effectively increased, and elements such as Nb, V, Ti and Mo are added properly, in this way, under the premise that the low thermal expansion coefficient of the alloy is guaranteed, the tensile strength of an austenite hot-rolled matrix is enhanced by means of composite dispersed precipitation of nitrides and carbides, and a high-quality base material is provided for further development of products such as cold-drawn invar alloy wires. According to the alloy, fine particles of NbN, TiN, VN, VC, Mo2C, NbC and the like are dispersively distributed on the austenite matrix, so that the tensile strength is effectively improved, and the expansion coefficient is reduced. The high-strength and low-expansion hot-rolled invar alloy has the characteristics that production cost is low, the operation process is simple, and the raw materials of the alloy are saved.

The invention relates to a carbide-enhanced type invar alloy wire and a preparing method thereof. The wire is mainly prepared from, by mass, 0.05-0.2% of C, 34-38% of Ni, smaller than or equal to 0.005% of S, smaller than or equal to 0.005% of P, 0.015-0.04% of Al, 0.1-3.5% of carbide forming elements and the balance Fe and inevitable impurities. The preparing method comprises the steps that the alloy components are prepared into a cast ingot through smelting and casting of a vacuum melting furnace, the cast ingot is forged into a round stick, the round stick is subjected to hot rolling to form a wire rod, the wire rod is subjected to cold drawing to form a wire body, and the wire body is subjected to aging heat treatment, surface acid pickling, surface finishing and other procedures. The carbide-enhanced type invar alloy wire and the preparing method thereof have the advantages that alloy raw materials are saved, the technological process is simplified, and production cost is reduced. The tensile strength of the produced alloy wire is higher than or equal to 1000 MPa, the coefficient of thermal expansion within the range of minus 100-200 DEG C is smaller than or equal to 2.6*10<-6>/DEG C, and the performance requirement of up-rating wire core products is met.

The invention provides a method for brazing porous Si3N4 ceramic and an Invar alloy, relates to a brazing method and aims to solve the technical problems that larger residual thermal stress can be formed on a ceramic and metal interface and reduces joint strength in a brazing cooling process of the Invar alloy. The method comprises the following steps: 1, Ag-Cu-Ti brazing filler metal and a binder are mixed and applied to the lower surface of the porous Si3N4 ceramic, Ag-Cu brazing filler metal and the binder are mixed and applied to the upper surface of the Invar alloy, then Cu foil is clamped between the Ag-Cu-Ti brazing filler metal and the Ag-Cu brazing filler metal, and a test piece is obtained; 2, a briquette is added to the upper surface of the test piece, and the test piece is arranged in a vacuum sintering furnace, subjected to heat preservation at 300 DEG C, subjected to heat preservation at 850-950 DEG C and then cooled. The joint strength can reach 73 MPa with adoption of the method. The invention belongs to the field of brazing.

Method of manufacturing “T” shaped stringers (1) with an angle different from 90° between the web (2) and the foot (3) whereby the “T” shaped stringers have a stringer web and a stringer foot. The method comprises, after placing together two hot-formed “L” shaped semi-stringers to form a “T” shaped stringer, placing the “T” shaped stringer inside an invar alloy angle leaving a gap between the stringer web and the invar alloy angle. Afterwards, a heating device (7) is moved over the stringer feet (3) surface and a roller (8) slides over said stringer feet (3) surface to adapt the geometry of the stringer feet to the geometry of the invar alloy angle. The resulting “T” shaped stringer is co-bonded on a cured skin with an adhesive line between the stringer and the cured skin, and finally the obtained “T” shaped stringer is cured.

The invention relates to a method for manufacturing an invar alloy foil material, and belongs to the technical field of materials. The method comprises the following steps that (1), molten steel is smelted, a double-roller thin-strip continuous casting device is used, and an invar alloy cast strip is prepared; (2), water cooling is carried out at a cooling rate of 10-100DEG C/s; (3), primary coldrolling is carried out after acid pickling, intermediate annealing is carried out on a primary cold-rolled sheet, and secondary cold rolling is carried out after acid pickling is carried out again; and (4), final annealing is carried out on a secondary cold-rolled sheet, the annealing temperature is 600-900 DEG C, and the annealing time is 5-60 min. According to the method, the segregation of harmful elements can be effectively inhibited, the oxidation of the invar alloy cast strip is reduced, the yield is remarkably improved, the cracking problem caused by poor thermoplasticity can be avoided, and the invar alloy foil material has the advantages of being low in hardness, good in toughness, good in thermal stability and strong in cubic texture.

The invention discloses an ultrafine grained invar alloy ribbon and a preparation method thereof. The invar alloy is composed of the following components in percentage by weight: 35 to 40% of Ni, 0.2 to 0.4% of C, less than 0.002% of S, less than 0.002% of P, one or two components of the following elements: 0.1 to 1.5% of V, 0.1 to 1.5% of Ti, 0.01 to 1.0% of Nb, 1.0 to 6.0% of Mo, and 1.0 to 8.0% of Cr, and the balance being Fe. The preparation method comprises steps of smelting, casting, solid solution processing, hot rolling and quick quenching. The average particle size of the prepared ultrafine grained invar alloy ribbon is in a range of 3.0 to 5.0 [mu]m. The whole preparation process only comprises steps of ingot smelting, plate rolling, and quick quenching for producing ribbons, no chemical reagent is introduced into the ribbon, so no chemical agent is discharged and the pollution to the environment is avoided. The prepared ultrafine grained invar alloy ribbon has the advantages of low cost, no pollution, and uniform size. The provided method can enhance the ultrafine grains and develop high-strength invar alloy ribbon products.

The invention discloses a welding technique of a welding part of invar alloy and hard alloy; the technique adopts a laser-argon arc complex welding method to realize the welding of a thick board of the invar alloy and hard alloy; an invar alloy welding layer with the single-side thickness of 6 to 12mm can be formed by only one-time welding; beveled edges are not opened when in welding, filling materials are not added, nitriding processing is not needed after welding and the interface of a sample does not have air holes and cracks after welding, and the Eta phase of the hardness of the interface can be controlled. Therefore, the technique not only overcomes the defects of the prior art, provides a shortcut for solving the difficulty that the invar alloy can not meet the requirements of strength of special occasions and high-temperature red hardness, but also provides a welding technique which has simple operation, low cost and excellent performance and is applicable to industrialized implementation.

The invention discloses a high-strength low-expansion invar alloy wire rod. The high-strength low-expansion invar alloy wire rod is characterized in that chemical components of alloy steel comprises, by weight, 0.41-0.60% of C, being equal to or less than 0.40% of Si, 0.20-0.60% of Mn, being equal to or less than 0.02% of P, being equal to or less than 0.02% of S, 35.1-37% of Ni, 1.51-3.0% of Mo, 0.5-0.99% of V, being equal to or less than 1.0% of Co, and the balance Fe and inevitable impurities. The total amount of impurity elements is less than 0.05%. The invention further provides a manufacturing method of the wire rod. The manufacturing method comprises the steps that vacuum induction furnace smelting is conducted, electrode bar electroslag remelting is conducted to form a steel ingot, the steel ingot is forged into a square billet, the forged square billet is hot-rolled into a small-specification wire rod, the hot-rolled wire rod is subjected to solution treatment, and the wire rod subjected to bright tempering is drawn into the finished wire rod according to a conventional process. According to the manufacturing method, through proper heat treatment and cold drawing processes and depending on carbide strengthening, solid solution strengthening and deformation strengthening, the obdurability of an alloy is improved, lower expansion performance is ensured to be obtained, and the alloy is low in cost and wide in application prospect.

The invention provides a preparation method of a bronze alloy with the near zero thermal expansion property. According to the method, compositing of positive and negative thermal expansion materials is not needed, and the near zero thermal expansion property is obtained in the bronze alloy. The alloy specifically comprises, by mass, 74-83% of copper, 9-13% of manganese and 8-13% of aluminum. Due to the smelting, casting, hot processing, heat treatment and cold processing process, the alloy with a stable near zero thermal expansion coefficient (the heat expansion coefficient is equal to 0+/-3X10<-6>/k) in the temperature interval of -100 DEG C to 150 DEG C can be prepared, and approaching to the thermal expansion coefficient level of a traditional invar alloy is achieved; and meanwhile thealloy has high electricity conductive and heat conductive performance, high strength, and good corrosion resisting capacity and process performance. The method is simple in process, convenient to operate and low in cost and easy to produce industrially, and can be better applied in the fields of the electronic industry and the precision meter industry and other fields sensitive to the size requirement.

The invention discloses a cemented carbide connector, which is formed by welding a high-cementing-phase cemented carbide with an invar alloy through argon tungsten-arc automatic welding process. The cemented carbide connector not only has high-strength structure by making use of the high strength, high wearing resistance and good red hardness of cemented carbide; but also has low-expansion function by making use of the constant thermal expansion property having invar effect in a specific temperature scope of the invar alloy, therefore the connector meets the special requirements of high-end cemented carbide tool and invar alloy precise instrument for materials, namely the connector has the characteristics of high wearing resistance, good high-temperature red hardness and high-temperature resistance, as well as keeps constant or deforms slightly in a specific temperature scope with the temperature changes. According to welding process of the invention, the interface of the welded sample has no pores, crackles or crisp eta carbide, the microscopic constitution and microhardness which is greater than 400HV0.2 transit smoothly.

The invention relates to laser cladding repair equipment and method for irregular curved surfaces of Invar alloy molds. Aiming at unqualified or invalid products in the production, manufacturing and use processes of Invar alloy molds, the curved surfaces of the unqualified or invalid Invar alloy molds are repaired in combination with reverse engineering and a laser cladding technology, so that notonly is the production and manufacturing cost reduced, but also the service life of the molds is prolonged. The repair equipment comprises a 3D laser scanner, a robot with a coaxial powder feeding nozzle, a laser, a laser water cooler, an adjustable powder feeder, a monitor, a control system and the like. The repair method comprises the following steps: (1) performing 3D scanning to obtain a to-be-restored region model; (2) designing a cladding scheme; (3) carrying out a cladding experiment for repairing; and (4) checking the size of the repaired part.

The invention relates to a FeNi invar alloy with a good welding property. The FeNi alloy is composed of, by mass, 0.04%-0.15% of C, 0.1%-0.5% of Si, 0.10%-0.5% of Mn, 0%-0.008% of P, 0%-0.005% of S, 0.001%-0.015% of Ca, 31.0%-38.0% of Ni, 0%-4.0% of Co, and the balance Fe and unavoidable impurities. Meanwhile, the alloy components are controlled to be within a certain range when the components are designed, so that the alloy is ensured to have a good low-expansion property. According to the FeNi invar alloy with the good welding property, the requirement for the using environment of fields such as large-scale high-precision disc-carving machines, carbon fiber structural molds and low-temperature containers can be met. The FeNi invar alloy is good particularly in properties of the welding hot crack resistant aspect.

A method for preparing an invar alloy resonance bar includes the following steps: a, preparation of mixed powder; b, preparation of feeding materials; c, injection molding; d, debinding; and e, sintering. The raw materials are even in ingredients and are fine in particles; the sintering density of products are high, the feeding materials are even during feeding; the density of the obtained product workblank is even during infection molding after material feeding; product shrinkage is consistent during sintering, and sintered products do not need any post mechanical machining; the feeding materials can be reused, and the utilization rate of the materials can reach 100%; catalytic debinding is adopted, the products are not out of shape, debinding is fast, the efficiency is high, and the debinding is complete; the obtained products are high in size accuracy, is consistent in product performance, is high in yield and efficiency, and is low in cost, and mass production can be achieved. The thermal expansion coefficient of the produced invar alloy resonance bar by adoption of the method is 1.5X10-6/ DEG C, and can reach 1.8X10-8/DEG C in the condition of 36% nickel, and will not change in the indoor temperature of -80-+100 DEG C, the density is greater than 98%, and the silver, gold and nickel can be directly electroplated.

The invention discloses a compound brazing material for brazing a quartz short fiber enhanced silicon dioxide composite material and Invar alloys as well as a preparation method thereof, and relates to the compound brazing material and the preparation method thereof. In order to solve the problem that a large quantity of fragile compounds are produced because joint micro-structures of joints are brazed by adopting an active brazing material at a temperature of 400 DEG C or above in an existing welding technology of an SiO2f/SiO2 composite material and the Invar alloys, the compound brazing material is prepared from Cu powder, few-layer graphene and TiH2. The method comprises the following steps: 1, weighing the Cu powder and the TiH2 powder; 2, carrying out in-situ growth on graphene by adopting a CuTi brazing material; and 3, mechanically mixing VFG/Cu powder with the TiH2 powder. The joints brazed by adopting the brazing material disclosed by the invention have the advantages that the shearing strength is improved from original 5MPa to 15MPa, and the amplitude of the improvement is 200 percent. The compound brazing material disclosed by the invention is applied to the field of brazing materials.

The invention provides a mask plate for effectively improving vapor deposition quality including a mask plate body. The mask plate body is provided with a pattern opening, and is made from the material of Invar alloy 4J36. The material of Invar alloy 4J36 is adopted to make the mask plate body, because the material has anomalous thermal expansion of an invar effect, and an average expansion coefficient thereof is generally 1.5*10<-6> DEG C, reaches 1.8*10<-8> DEG C when the nickel content of the material is 36%, and is invariable at the temperature range of -80 DEG C- +100 DEG C. Thus, the deformation of the mask body and the mask frame made from the material is very small in a vapor deposition chamber, for effectively reducing the dimensional accuracy deviation of a pattern opening and the positional accuracy deviation of the pattern opening, effectively improving vapor deposition quality, and increasing the film-forming rate of an organic vapor deposition material.

The present invention relates to the technical filed of electroformed alloy deposition, and discloses a metal mask for vapor plating. Materials for the metal mask for vapor plating include iron and nickel, wherein the iron content is 63%-65%. The metal mask for vapor plating has good surface brightness, and a coating surface is good in quality; and compared with an etched invar alloy, the metal mask for vapor plating is low in the cost, simple in the process and energy-saving, and has a high opening precision, and openings with good quality. Meanwhile, the present invention also provides a production method for the metal mask for vapor plating.