45 results about "Chromium" patented technology

An electrically controlled propellant comprising an ionomer oxidizer polymer binder, an oxidizer mix including at least one oxidizer salt and at least one eutectic material, and a mobile phase comprising at least one ionic liquid is disclosed. The PVAN polymer in the present invention may be of medium (>100,000) to high molecular weight (<1,000,000). The present invention also may include the controlled cross-linking of the polymer using epoxy resins, the use of moisture barrier coating, the addition of an energetic combustion additives such as Chromium III and polyethylene glycol polymer.

A semiconductor carrier film includes (i) a base film having insulating property, (ii) a barrier layer provided on the base film, the barrier layer including nickel-chrome alloy as a main component, and (iii) a wire layer provided on the barrier layer, the wire layer being made of conductive material including copper, and a ratio of chrome in the barrier layer is 15% to 50% by weight. A semiconductor device is formed by bonding a semiconductor element to the wire layer. The semiconductor carrier film and the semiconductor device are suitable for attaining finer pitches and higher outputs, because insulating resistance between adjacent terminals is less likely to deteriorate then in conventional art even in the environment of high temperature and moisture.

The invention relates to a titanium-carbide-based steel-bonded cemented carbide material which is characterized in that titanium carbide (TiC) is adopted as a hard base of the material, and alloy tool steel is adopted as a binding phase. The volume percentage of the titanium carbide is 35-45%, and the mass percentage of the alloy tool steel is 55-65%. A total mass of the titanium carbide and the alloy tool steel is 100%. The alloy tool steel is composed of chromium, molybdenum, aluminum, nickel, titanium, and iron. According to the invention, the alloy material is prepared with an advanced low-pressure hot-isostatic-pressing sintering technology. The production process is simplified, production efficiency is improved, and energy consumption is greatly saved.

The invention relates to a method for preparing a nickel-chromium multi-component high-resistance electrothermal alloy and particularly relates to a method for preparing the nickel-chromium multi-component high-resistance electrothermal alloy by melting in combination with powder metallurgy. The preparation method comprises the following steps of proportioning raw materials, melting, crushing, ball-milling, carrying out spark plasma sintering, carrying out homogenizing annealing and isothermal forging, hot-rolling steel wire rods, carrying out stress relief annealing, rinsing and carrying out multi-pass drawing and the like. Due to the adoption of the preparation method combining melting and powder metallurgy, the composition segregation caused by the large difference in the melting point, density and mass ratio of each component in a conventional smelting method can be effectively avoided, uniform distribution of each component is achieved, the microstructures of the alloy are effectively improved in combination with subsequent homogenizing annealing, isothermal forging, hot rolling of steel wire rods and the like and the mechanical properties, application temperature and service life are improved.

The invention discloses a boron-bearing chromium molybdenum nickel wear-resistant alloy comprising the following chemical components: 0.30-0.50% of C, 0.8-2.6% of B, 0.5-1.8% of Mn, 0.4-1.0% of Si, 4.0-6.0% of Cr, 2.0-4.5% of Mo, 0.8-2.0% of Ni, 3.5-5.5% of V, 0.02-0.04% of Ce, 0.02-0.04% of La, 0.10-0.20% of Mg, 0.01-0.03% of Ca, 0.05-0.10% of Ba, 0.040 or less of S, 0.040 or less of P, and balance of Fe and unavoidable impurities; the preparation steps include melting and heat treatment; the present invention aims to provide the boron-bearing chromium molybdenum nickel wear-resistant alloy which is safer, more wear resistant, and better in toughness, and also aims to provide a preparation method which is simple and easy to operate, simple in technological process and low in cost for preparation of the boron-bearing chromium molybdenum nickel wear-resistant alloy.

The invention discloses a novel high-chromium ferritic heat resistant steel, composed of the following components by mass percent: 0.08-0.1% of C, less than or equal to 0.5% of Si, 0.3-0.6% of Mn, 8.5-9.0% of Cr, 0.3-0.6% of Mo, 1.5-2.0% of W, 0.20-0.25% of V, 0.02% of Cu, 0.07-0.09% of Nb, less than 0.005% of Ti, 0.004-0.005% of B and less than 0.005% of N, and the balance of Fe and impurities. The thermo-mechanical treatment process of the steel comprises the following steps of: heating at the rate of 5 DEG C/s until the temperature reaches 1100-1200 DEG C and preserving heat for 5-10 min; and then cooling at the rate of 5 DEG C/s until the temperature reaches 900-700 DEG C, preserving heat for 5-10 s, performing compressive deformation at the deformation rate of 1/s by the deformation quantity of 50-70%; preserving heat for 0-100 s after the completion of deformation, and then performing air cooling until the temperature reaches the room temperature. The thermal treatment process provided by the invention is capable of promoting the precipitation of the MX phase having excellent stability, thereby improving the high temperature performance of the steel. Compared with the traditional thermal treatment process, the thermo-mechanical treatment process is simplified in process flow so that the production cost is reduced and the overall performance is improved; and therefore, the thermo-mechanical treatment process can be applied to actual production.

The invention discloses a chromium-based functional nucleic acid sensor and an application thereof in the technical field of metal ion detection. The sensor comprises a molecule recognition element, asignal amplification element and a signal conversion element, wherein the molecule recognition element comprises chromium ion deoxyribozyme consisting of a substrate chain and an enzyme chain; the signal amplification element comprises an isothermal amplification system and hemin, and the isothermal amplification system comprises an amplification template; the signal conversion element comprisesa color developing agent. The sensor is based on the chromium ion deoxyribozyme, an isothermal index amplification reaction and a G-quadruplex liquid phase sensing technology, is convenient, quick, high in sensitivity, high in specificity and resistant to high salinity in chromium ion detection and can be used in field detection of chromium ions in the environment.

The potential for release of soluble chromium (VI) ions in the production or processing of certain pigments is reduced by use of certain additives. The additives include aluminum metaphosphate, aluminum fluoride, tungsten oxide, tungstic acid, and mono-ammonium phosphate. The pigments are those which contain chromium and have a corundum crystal structure.

The invention relates to a decorative and thermal insulation integrated novel lightweight walling material made from polishing brick waste. The novel lightweight walling material is characterized by being composed of colored glass and a polishing brick waste foamed material, wherein the colored glass is composed of 25-45% of potassium feldspar, 20-40% of quartz, 5-25% of calcite, 4-8% of borax, 2-8% of barium carbonate, 2-8% of zirconium silicate, 2-6% of potassium nitrate and 0-10% of ceramic toner; the polishing brick waste foamed material is composed of 85-100% of polishing brick waste and0-15% of coal gangue; the ceramic toner is one or more then one of cobalt black, malachite green, chromium-selenium red, praseodymium yellow and zirconium-vanadium blue; and the decorative and thermal insulation integrated novel lightweight walling material is prepared by drawing, material spreading and firing. According to the invention, by adding the ceramic toner, the decorative and thermal insulation integrated novel lightweight walling material can be prepared into high-grade internal and external wall finishing materials with various single colors, compound colors and landscape and character patterns; and the production cost is low, the environmental pollution is reduced, the decorative and thermal insulation integrated novel lightweight walling material is economical and environmentally friendly and the waste is recycled.

The invention relates to a sleeve (10), in particular a protective casing, for covering a sensor, in particular for covering a temperature sensor (70). According to the invention, the sleeve (10) is made from a nickel-chromium-aluminum-iron alloy wherein the alloy is made from 10.0 - 30.0 wt.% chromium (Cr), 0.5 - 5.0 wt.% aluminium (Al), 0.5 - 15.0 wt.% iron (Fe) and 50.0 - 89.0 wt. % nickel (Ni).

The invention provides the high-strength 23Mn2CrNiMnVERA steel for railway train connection and a preparation method thereof. The 23Mn2CrNiMnVERA steel comprises the following components of carbon, silicon, manganese, vanadium, aluminum, chromium, molybdenum, nickel, cerium, copper, phosphorus, sulfur, Fe and non-removable impurities; the preparation method comprises the steps of molten iron pretreatment, converter smelting, LF refining, VD vacuum refining and continuous casting tapping. The high-strength 23Mn2CrNiMoVREA steel for connection has the advantages of being easy to weld, high in tensile property and high in yield strength at low temperature (-60 DEG C); and the preparation method of the high-strength 23Mn2CrNiMnVERA steel for the railway train connection has the advantages of being easy to control in the process and suitable for popularization.

The invention relates to a welding wire for steel-copper dissimilar metal submerged-arc welding and a welding method of the welding wirearc, belonging to the field of submerged-arc welding. The welding wire comprises the following chemical components in percentage by weight: 0.05-0.15% of arcbon, 0.80-2.10% of manganese, 0.07-0.95% of silicon, 0-0.03% of sulphur, 0-0.03% of phosphorus, 0.20-0.35% of copper, 0-0.20% of chromium, 0-0.30% of nickel and the balance of iron; the welding method comprises the following steps that: before being welded, a copper plate and a steel plate are not preheated; the steel plate and the copper plate are fixed by using gas shield welding spot welding; steel-copper dissimilar metal submerged-arc welding wires are used for matching with SJ101 welding flux so as to carry out submerged-arc welding; when being welded, the welding wire deviates 4mm-8mm from the side of the copper plate; the welding current is 396-630A; the welding voltage is 35-40V; and the welding speed is 23-30m/h. The welding joint obtained by the welding method provided by the invention has the characteristics of good mechanical performance, high efficiency, beautiful appearance and little crack, etc.

The invention discloses anti-corrosion and anti-wear high manganese steel and a preparation method thereof. The high manganese steel consists of the following components in percentage by weight: 1.0-1.2% of carbon, 14-15% of manganese, 0.48-0.6% of silicon, 10.5-12.5% of chromium, 0.5-0.6% of molybdenum, 0.3-0.5% of nickel, 0.1-0.3% of aluminum, 0.08-0.12% of copper, 0.01-0.02% of nitrogen, 0.01-0.03% of rare earth element, less than or equal to 0.03% of phosphorus, less than or equal to 0.03% of sulfur and the balance of iron. The preparation method comprises: (1) smelting: adding alloy and metal raw materials including technically pure iron, nitrided ferrovanadium, ferromanganese, technically pure aluminum and the like into an electric furnace, heating to melt all the alloy and metal raw materials, maintaining for 30 minutes at the temperature of 1,730-1,750DEG C, and discharging at the temperature of 1,460-1,500 DEG C; (2) casting; (3) heat treatment after casting; and (4) product acceptance. The anti-corrosion and anti-wear high manganese steel has the advantages of good anti-corrosion property, good anti-wear property, good impact toughness, long service life and short production period.

The invention relates to a double component rolling sand making cavity assembly for a cone sand making machine and a manufacturing method. The upper part of the rolled mortar wall is made of Mn13, the lower part of the rolled mortar wall is made of high-chromium cast iron, and a ring-shaped groove is formed in the outer wall or the inner wall at the lower part of the rolled mortar wall, and is in concave-convex fusion casting coordination with a ring-shaped groove formed in the inner wall or the outer wall at the upper part of the rolled mortar wall; the upper part of a crushing wall is made of Mn13, the lower part of the crushing wall is made of high-chromium cast iron, and a ring-shaped groove is formed in the outer wall or the inner wall at the lower part of the crushing wall, and is in concave-convex fusion casting coordination with a ring-shaped groove formed in the inner wall or the outer wall at the upper part of the crushing wall. The double component rolling sand making cavity assembly has the advantages that 1, the critical defects that in the sand making process on the rolled mortar wall and the crushing wall which are made of a single material, the abrasion losses on the rolled mortar wall and the crushing wall by stone materials in different specifications are different, so that the upper parts of the rolled mortar wall and the crushing wall are slightly abraded while the lower parts of the rolled mortar wall and the crushing wall are seriously abraded, then a groove is formed in a rolling sand making cavity, and the sand cannot be made, are solved radically; 2, the abrasion loss of the Mn13 at the upper parts of the rolled mortar wall and the crushing wall when the stone materials are crushed is in relative accordance with the abrasion loss of the rolling sand making cavity at the lower part of the high-chromium cast iron rolled mortar wall.

The present disclosure relates to a chromium-aluminum binary alloy with excellent corrosion resistance and a method of producing the same, and more particularly to a chromium-aluminum binary alloy with excellent corrosion resistance, including: 1 to 40% by weight of aluminum (Al), the balance of chromium (Cr), and other unavoidable impurities with respect to a total weight of the alloy, and a method of producing a chromium-aluminum binary alloy with excellent corrosion resistance, the method including: (Step 1) mixing and melting a raw material comprising: 1 to 40% by weight of aluminum (Al), the balance of chromium (Cr), and other unavoidable impurities with respect to a total weight of the alloy; and (Step 2) solution treating the alloy melted in Step 1. The chromium-aluminum binary alloy may be easily produced and has ductility, thus being highly applicable as a coating material for a material requiring high-temperature corrosion resistance and wear resistance.

The invention relates to a high-temperature-resistant high-performance rare earth permanent magnet material. The high-temperature-resistant high-performance rare earth permanent magnet material is prepared from, by weight, 20-35% of rare earth elements, 0.8-1.5% of boron, 0.02-0.2% of molybdenum, 0.5-5% of silicon, 0.1-3% of vanadium, 0.02-0.5% of calcium, 0.02-0.5% of zirconium, 0.02-0.5% of chromium, 0.5-5% of nickel and the balance iron and inevitable impurities. The rare earth permanent magnet material has high high-temperature resistance and excellent mechanical performance and is low in cost and high in stability, a preparation method is simple, and large-scale industrial production can be easily achieved.

The invention relates to the field of automobile making, in particular to a novel thermoforming reinforcer and a processing method thereof. The novel thermoforming reinforce comprises the following components in parts by weight: 20-30 parts of iron, 3-5 parts of nano silicon carbide particles, 3-5 parts of tungsten, 1-2 parts of manganese, 2-6 parts of molybdenum, 3-5 parts of cobalt, 2-3.5 partsof nickel, 1-2 parts of chromium, 3-5 parts of vanadium and 2-4 parts of titanium. A manufacturing method for the reinforcer comprises the following steps of: (1) uniformly mixing the components; (2)adding mixed raw materials into a heating furnace to refine; (3) forging and pressing; (4) quenching; (5) tempering; and (6) stamping and manufacturing. A stamping part material manufactured by the manufacturing method has excellent hardness, excellent yield strength and excellent tensile strength.

The invention discloses a smelting method for rare-earth microalloyed steel. The smelting method can be used for smelting the rare-earth microalloyed steel. By controlling the temperature, the vacuumdegree and the contents of sulfur, rare earth, oxygen, aluminum and phosphorus, high-precision and high-purity steel which is low in content of impurities and satisfies production requirements is obtained through twice smelting. In a smelting process, original vanadium (niobium, chromium, molybdenum and titanium) alloying elements in molten iron are effectively prevented from being oxidized and burnt, so that follow-up addition of vanadium (niobium, chromium, molybdenum and titanium) is reduced. Besides, the contents of sulfur, phosphorus, oxygen and aluminum in molten iron are reduced beforeadding of rare earth alloy, so that the amount of rare earth alloy which is oxidized and vulcanized is reduced, and the addition of rare earth alloy in steel is effectively reduced. Meanwhile, formation of aluminic acid rare earth, phosphoric acid rare earth or phosphoric rare earth occluded foreign substances is reduced, so that the quality of an end product is improved. By adoption of the smelting method, the smelting cost is lowered, and beneficial effects in smelting rare earth containing vanadium (niobium, vanadium, chromium, molybdenum and titanium) steel are improved.

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 discloses a thermal fatigue resistant composite metal material. The thermal fatigue resistant composite metal material comprises a memory alloy layer, a stellite alloy layer and a metal compound layer, wherein the memory alloy layer is copper gold and zinc alloy; the stellite alloy layer is cobalt-chromium-tungsten alloy; the metal compound layer is cobalt-based alloy; the copper gold and zinc alloy accounts for 2-10 percent of the weight of the main body of the composite metal material; the cobalt-chromium-tungsten alloy accounts for 41-50 percent of the weight of the main body of the composite metal material; and the cobalt-based alloy accounts for 43-49 percent of the weight of the main body of the composite metal material. The provided thermal fatigue resistant composite metal material has the characteristics of high thermal fatigue resistance, high heat resistance, high corrosion resistance and the like.

A double-face roller coating color aluminum plate preparing technology mainly comprises the following steps including unreeling, dipping degreasing, brushing, spraying degreasing, cleaning, rolling coating, ground coating + back coating, drying, cooling, back coating, drying cooling, face coating, drying, cooling, reeling and a packaging. A four-coating and three-drying assembly line, namely ground coating + back ground coating + back face coating + front face coating is composed of three layers of ovens, totally three drying procedures including drying for ground coating + back coating, drying for back face coating and drying for front face coating are adopted, and a dipping, brushing and spraying degreasing and dirt removing method is adopted in pretreatment, the surface of an aluminum plate has a better effect than an independent dipping or independent spraying, degreasing and dirt removing method, the surface cleanliness degree is improved, and the coating and the aluminum substrate attaching force can be greatly improved; and an environment-friendly and chromate-free passivation treatment method is adopted in chemical layer pretreatment, the chemical layer roller coating technology is adopted, film forming is more uniform, and chemical layer treatment environment protection, pollution avoiding and zero emission are achieved.

The invention discloses an alloy powder for plasma cladding. The alloy powder for plasma cladding is mainly composed of, by mass, 51%-65% of chromium, 0%-15% of vanadium, 8.1%-9% of carbon, 6.1%-8% ofboron, 0%-6% of cobalt, 0%-12% of tungsten carbide and the balance Fe and unavoidable impurities. The alloy powder for plasma cladding is especially suitable for plasma cladding of wear-resistant parts, and a cladding layer is high in hardness, good in wear resistance, small in cracking tendency and good in plasma cladding technology performance.