45results about How to "Improve surface oxidation resistance" patented technology

The high stability and high magnetism quenched R-Fe-B base permanent magnetic alloy powder has the basic expression of RxFe100-x-y-z-vMzCovBy, where R is light RE element(s) Nd, Pr and La, and M is element(s) of Nb, Zr, Ti, etc; and consists of main R2Fe14B phase and small amount of superfine auxiliary Fe-alpha-M-beta phase. Adding Nb and other transition elements to form small amount of superfine auxiliary Fe-alpha-M-beta phase during fast solidification can inhibit over nucleation and growth of Nd2Fe14B crystal grain, improve the performance of the quenched material, fine the Nd2Fe14B crystal grain and raise the temperature stability and antioxidant process of the material. In addition, the permanent magnetic alloy powder has obviously raised intrinsic coercive force, high saturated magnetization, high residual magnetism and other advantages.

The invention relates to a bonding copper wire and a preparation method thereof. The bonding copper wire comprises the following components in percentage by mass: 0.0003 percent to 0.003 percent of lithium, 0.0002 percent to 0.002 percent of calcium, 0.0002 percent to 0.001 percent of aluminium, 0.0005 percent to 0.005 percent of cerium and/or yttrium, 0.0001 percent to 0.001 percent of other inevitable impurity elements and the balance of copper. The preparation method of the bonding copper wire comprises the following steps of: preparing a middle alloy, preparing an alloy cast ingot, annealing uniformly, heat extrusion, stress relief annealing, drawing, final annealing, winding for multiple coils, packaging, and final protective packaging, wherein in a drawing process, middle stress relief annealing can be performed according to practical needs. The bonding copper wire has better inoxidizability while keeping better conduction and radiation properties; in the preparation process of the bonding copper wire, the uniform annealing is added and the middle stress relief annealing is performed, so that the mechanical property of the prepared bonding copper wire is better.

The invention relates to a method for preparing a composite membrane for improving oxidation resistance of a copper lead of an integrated circuit. The method comprises the following steps of: mixing a little amount of Al and Cu, and repeatedly smelting the mixture in an electric arc furnace to form CuAl alloy; and annealing the CuAl alloy in a heating furnace under hydrogen atmosphere, preserving the heat for certain time, and cooling the annealed product to room temperature to form anti-oxidation copper. After Al element is added, the alloy is annealed in the hydrogen, the Al in the alloy is segregated to the surface of Cu through segregation action and reacts with the rest O in the annealing atmosphere to generate Al2O3 on the surface of the alloy, and a Cu-Al2O3 composite attached membrane with good mechanical property is formed on the surface of the Cu so as to block further oxidation of the Cu and well solve the problem of oxidation of a connecting wire in the copper. The encapsulation temperature of an encapsulation material in the conventional integrated circuit is below 400 DEG C, and the Cu-Al2O3 composite attached membrane formed on the surface of the integrated circuit by using the CuAl alloy as a lead frame material improves the anti-oxidation capability of the lead material and reduces the encapsulation cost.

The invention relates to a chopped fiber carbon fiber composite material and a preparation method thereof, and belongs to the technical field of carbon fiber composite material preparation. The preparation method comprises the following steps: 1, grinding a carbon fiber raw material; 2, carrying out short fiber deposition molding; 3, carrying out resin impregnation; 4, forming a mold and injectingliquid, namely putting the resin-infiltrated fiber blank into the mold for forming the mold, and injecting a potential mesophase pitch liquid at the same time; 5, performing high-pressure forming heat treatment: subjecting the infiltrated fiber blank containing the asphalt liquid to heat treatment under high pressure and then condensing the fiber blank to obtain a cured blank; 6, carbonization heat treatment: demolding the cured blank body and then carbonizing to obtain a carbonized blank body; and 7, high-temperature graphitization: carrying out high-temperature graphitization treatment on the carbonized blank to obtain the finished product carbon fiber composite material. The chopped fiber carbon fiber composite material prepared by the invention has high purity and greatly improved compression strength and bending strength, solves the problem of corner solid waste, realizes recycling of the material and generates good economic benefits.

The invention relates to a copper bonding wire and a preparation method thereof. The copper bonding wire comprises, by mass, 0.0003-0.003% of lithium, 0.0002-0.002% of calcium, 0.0002-0.001% of aluminum, 0.0005-0.005% of cerium or yttrium, 0.0001-0.001% of other inevitable impurity elements and the balance copper. The preparation method of the copper bonding wire comprises the steps of manufacturing of intermediate alloy, manufacturing of alloy ingots, homogenizing annealing, hot extrusion, stress relief annealing, drawing, final annealing, multiple winding subpackaging and final protective packaging, and intermediate stress relief annealing can further be conducted in the drawing process according to the actual demands. The copper bonding wire has better oxidation resistance while maintaining the good conducting and radiating properties, and the prepared copper bonding wire is better in mechanical performance due to the facts that homogenizing annealing is additionally conducted and the intermediate stress relief annealing technique can be conducted according to demands in the preparation process of the copper bonding wire.

The invention relates to the field of metal materials, and particularly discloses a copper alloy and a copper alloy plate and a preparation method and application thereof. The copper alloy has good corrosion resistance, the trace titanium element and the metal copper are melted into an alloy, Ti is segregated to the surface of the alloy by a heat treatment process and annealing in a mixed gas composed of argon and hydrogen, so that the surface of the metal copper is attached to TiO2 composite films, therefore, the internal metal copper can be well protected from reacting with surrounding oxygen, water vapor and the like, so that the surface oxidation resistances of automobile parts with copper as main raw materials can be improved, corrosion prevention is not needed by using an electroplating method, the performance is excellent, and the technical problem of environmental pollution caused by the fact that existing copper products are corroded by adopting electroplating is solved.

The invention relates to an anti-spattering soldering tin wire structure which comprises a soldering-aid layer, a tin layer and an anti-oxidation layer. The tin layer wraps the surface of the soldering-aid layer, and the anti-oxidation layer evenly coats the surface of the tin layer. The tin layer comprises a transverse tin layer body and a longitudinal tin layer body which are arranged in the soldering-aid layer, the soldering-aid layer is divided into four arc soldering-aid layer bodies by the transverse tin layer body and the longitudinal tin layer body, and at least one through hole is formed in the tin layer. By the arrangement of the through hole, internal pressure is effectively relieved, and the spattering phenomenon is avoided; by the arrangement of the transverse tin layer body and the longitudinal tin layer body, a soldering flux does not need to be additionally added in the soldering process, and the surface anti-oxidation performance is improved.

The invention discloses a device for detecting properties of a rotating heat pipe. The device comprises a computer, a signal collecting card, a copper lead wire, and a plurality of heating wires, wherein the copper lead wire and the heating wires are axially and uniformly distributed along the rotating heat pipe and can be in contact with a pipe shell of the rotating heat pipe. The computer is connected with the signal collecting card through a data line; a loop is formed by each heating wire and the copper lead wire through the pipe shell of the rotating heat pipe; a supporting device is fixedly arranged at one ends of the heating wires and the copper lead wire, which are in contact with the pipe shell of the rotating heat pipe; and the other ends of the copper lead wire and the heating wires are respectively connected with the signal collecting card. The device provided by the invention has a simple structure and can rapidly, simply and conveniently detect the heat conduction properties of the rotating heat pipe at a high-speed rotation state.

The invention discloses a manufacturing method of a metal valve. The metal valve has the beneficial effects of being resistant to corrosion, low in cost, high in thermal fatigue property and thermal stability and excellent in overall property through the material matching and the manufacturing process of metal materials. The metal valve has high surface oxidation resistance and is long in service life.

The invention discloses an electrothermal Ni-Cr alloy wire with high resistance. The electrothermal Ni-Cr alloy wire is made of an alloy material, and the alloy material comprises components as follows: 1%-2% of Te, 0.2% of Si, 0.7% of At, 0.4% of Os, 0.2% of Nd, 28.7% of Cr and the balance of Ni and inevitable impurities. The electrothermal Ni-Cr alloy wire with high resistance has higher electrical resistivity, good surface oxidation resistance, high temperature level and higher strength at the high temperature.

The invention discloses a nickel-chromium alloy wire. The nickel-chromium alloy wire is made from an alloy material, and the alloy material comprises the following ingredients: 1-2% of P, 0.9% of Te, 1.1% of Be, 0.7% of Sr, 0.3% of Nb, 19.5% of Cr, and the balance Ni and inevitable impurities; and the alloy material is prepared through the following steps: 1) melting Ni, P, Ni-Te alloy and Ni-Be alloy under a protective atmosphere; 2) adjusting a temperature to 975 DEG C, adding Ni-Sr alloy, Ni-Nb alloy and Ni-Cr alloy into a melt, uniformly stirring, and insulating heat and standing for 33 minutes; and 3) charging argon, and standing and cooling the melt to 675 DEG C, and carrying out die-casting to obtain the alloy material. The nickel-chromium alloy wire disclosed by the invention has a high electrical resistivity, high surface oxidation resistance, a high temperature class, and a high strength under a high temperature.

The invention discloses a bonded copper wire. The bonded copper wire is prepared from the following components in percentage by mass: 0.0001%-0.0050% of beryllium, 0.0001-0.0010% of iron, 0.0001%-0.001% of silicon, 0.0001%-0.0010% of platinum, 0.001%-0.0050% of vanadium, 0.0001%-0.0050% of calcium, 0.0001%-0.01% of inevitable other impurity elements, and the balance of copper. A preparation methodfor the bonded copper wire comprises the following steps: (1) smelting; (2) rough-medium pulling; (3) fine pulling; (4) annealing; (5) re-winding; and (6) packaging. The preparation method can meet mechanical properties of a bonding material, and can provide the bonded copper wire with better surface oxidization resistance. Moreover, the preparation method is simple and convenient to operate, enables the processing material to obtain excellent mechanical properties, and meets practical using requirements.

The invention discloses a nickel-chromium high-resistance electrothermal alloy. The nickel-chromium high-resistance electrothermal alloy is made from an alloy material, and the alloy material comprises the following ingredients: 1-2% of P, 1.1% of S, 0.9% of V, 1.3% of Co, 0.8% of Cd, 15.5% of Cr, and the balance Ni and inevitable impurities; and the alloy material is prepared through the following steps: 1) melting Ni, P, Ni-S alloy and Ni-V alloy under a protective atmosphere; 2) adjusting a temperature to 905 DEG C, adding Ni-Co alloy, Ni-Cd alloy and Ni-Cr alloy into a melt, uniformly stirring, and insulating heat and standing for 26 minutes; and 3) charging argon, and standing and cooling the melt to 605 DEG C, and carrying out die-casting to obtain the alloy material. The nickel-chromium high-resistance electrothermal alloy disclosed by the invention has a high electrical resistivity, high surface oxidation resistance, a high temperature class, and a high strength under a high temperature.

The invention discloses a watch dial embellishing and flash sand pressing treatment method, and belongs to the technical field of watch dial embellishing and flash sand pressing treatment. The method comprises the steps of flash sand preparation, watch dial preparation, sand pressing pretreatment on a watch dial, arc-shaped sand treatment and electrophoretic coating treatment, the watch dial is stamped and formed into a required shape, and then mirror polishing is conducted on the stamped watch dial to achieve a bright mirror effect. By conducting heat treatment on a workpiece at different temperature and different time, the workpiece presents different colors on the basis of different lines, so that the ornamental value and the corrosion resistance are improved; and flash sand is pressed on the dial by utilizing an arc-shaped sand process, and the dial is subjected to electrophoretic coating, so that the product has metal luster, the dial has both a sand surface effect and the mirror effect, and the corrosion resistance is also improved.

The invention discloses a nickel-chromium flat wire. The nickel-chromium flat wire is made from an alloy material, and the alloy material comprises the following ingredients: 1-2% of P, 0.9% of Ti, 1.2% of Li, 0.2% of Y, 0.4% of Zr, 18.5% of Cr, and the balance Ni and inevitable impurities; and the alloy material is prepared through the following steps: 1) melting Ni, P, Ni-Ti alloy and Ni-Li alloy under a protective atmosphere; 2) adjusting a temperature to 985 DEG C, adding Ni-Y alloy, Ni-Zr alloy and Ni-Cr alloy into a melt, uniformly stirring, and insulating heat and standing for 34 minutes; and 3) charging argon, and standing and cooling the melt to 685 DEG C, and carrying out die-casting to obtain the alloy material. The nickel-chromium flat wire disclosed by the invention has a high electrical resistivity, high surface oxidation resistance, a high temperature class, and a high strength under a high temperature.

The invention discloses a magnesium-aluminum electrothermal alloy material. The magnesium-aluminum electrothermal alloy material is made of an alloy material body, wherein the alloy material body is prepared from the components of 2-3% of Si, 0.3% of B, 0.5% of C, 0.2% of Mn, 0.5% of Na, 21.8% of Mg and the balance of Al and inevitable impurities. The magnesium-aluminum electrothermal alloy material has the advantages of being relatively high in electrical resistivity, good in surface oxidation resistance, high in temperature grade and relatively high in strength at a high temperature.

The invention discloses a wear-resistant alloy material. The wear-resistant alloy material is made of an alloy material, wherein the alloy material comprises 2-3% of Si, 0.3% of ZR, 0.5% of C, 0.2% ofMn, 0.5% of Cr, 21.8% of Mg and the balance Al and inevitable impurities. The wear-resistant alloy material has the advantages of being high in wear resistance, good in surface oxidation resistance,high in temperature grade and high in strength at a high temperature.