72results about How to "Reduce oxidation inclusions" patented technology

The invention provides a welding wire matched with a corrosion-resistant aluminum-magnesium-scandium alloy and a preparation method thereof. The welding wire comprises the following components: 3.0-5.0wt% of Mg, 0.1-0.2wt% of Zr, 0.1-0.2wt% of Sc, 0.2-0.3wt% of Mn, 0.05-0.15wt% of Ti, 0.05-0.25wt% of Cr, 0.01-0.05wt% of Ce, 0.01-0.05wt% of Y and the balance of Al. The preparation method of the welding wire matched with the corrosion-resistant aluminum-magnesium-scandium alloy comprises the following steps: (1) preparing an aluminum-based master alloy; (2) preparing alloy raw materials; (3) refining the alloy; (4) measuring hydrogen content; (5) ingot casting; and (6) extruding and drawing for molding. The invention meets the need for welding production of an aircraft fuel tank and a rocket tank, and welding seams can obtain higher comprehensive mechanical property of joints.

A novel scandium-containing cast aluminum-lithium alloy is disclosed. The alloy includes, by weight, 1.6-1.99% of Li, 0.9-1.9% of Cu, 0.2-0.7% of Mg, 0.1-0.25% of Zr, 0.05-0.35% of Sc, and impurity elements which are Fe, Si, Na, K and P, with the balance being Al, with the Fe content being less than 0.15% and the total content of the impurity elements being less than 0.25%. During preparation, Al-Cu and Al-Zr master alloys, pure aluminum, pure Mg and pure Li are smelted to obtain an aluminum alloy; then three stages of solid solution heat treatment are performed including solid solution heat treatment at 440-460 DEG C for 32 h, solid solution heat treatment at 510-520 DEG C for 24-32 h and solid solution heat treatment at 530-540 DEG C for 1-6 h; and after water quenching, artificial ageing treatment at 150-190 DEG C is performed for 16-48 h to obtain the novel scandium-containing cast aluminum-lithium alloy. The obtained novel scandium-containing cast aluminum-lithium alloy has a uniform microscopic structure, stable performance, density lower than density of traditional aluminum alloys, higher elastic modulus and rigidity, and other mechanical properties, and is low in cost. Theultimate tensile strength of the novel scandium-containing cast aluminum-lithium alloy can be 450-490 MPa and the specific elongation is 4.5-7.0%.

The invention discloses a ZG022Cr22Ni5Mo3N material duplex stainless steel smelting process. A medium-frequency induction furnace smelting process and an AOD furnace refining process are performed insequence; nitrogen alloying can be realized through nitrogen blowing; carbon in steel can be removed to reach a requested target value; the contents of harmful elements such as sulfur, oxygen and hydrogen in the steel can be reduced to the greatest extent, so that the purity and the quality of molten steel are greatly improved; poured castings achieve excellent welding performance, fatigue resistance and mechanical performances; the metallographic structure is uniform; the two-phase ratio is near 50%; the corrosion resistance is excellent; and the hot tearing and cold tearing tendency is reduced at the same time, so that the service life of the castings is prolonged, the manufacturing cost is greatly reduced, and the purposes of energy conservation, consumption reduction and environmentalprotection are achieved.

The invention belongs to the field of alloy manufacturing, and particularly relates to a wear-resistant corrosion-resistant multi-element manganese-aluminum bronze brazing alloy and a preparation method thereof. The wear-resistant corrosion-resistant multi-element manganese aluminum bronze brazing alloy is prepared from the following components in parts by weight: 7-10% of Al; 8-11% of Mn; 1.5 to3.0% of Fe; 1.5 to 2.5% of Ni; 0.005-0.03% of B; 0.05 to 0.1 of Y; 0.08-0.20% of La, and the weight ratio of the three elements of B to Y to La is 1: 10: 15-1: 3: 6, and other impurities are less thanor equal to 0.5 percent. The balance is Cu. The wear-resistant corrosion-resistant multi-element manganese-aluminum bronze brazing alloy disclosed by the invention is composed of Al, Mn, Fe, Ni, B, Y, La and Cu, the casting temperature is equal to or lower than 1050 DEG C, and the mechanical property is good. The alloy material is used for cladding an inner wall of a cylinder in a hydraulic support, has bright surface, less deformation, hardness of more than HB240, good wear resistance and corrosion resistance, the operation up to now has always been 2 times of the life of the original material, and the alloy material is still normally used.

The invention pertains to copper alloy processing field. A heat preserving furnace of the existing continuous casting copper and copper alloy technique has the shortcomings of no covering agent or the existing covering agent with high cost and poor effect. In the invention, the metals covered on waste graphite electrodes and waste graphite crystallizers are removed, smashed into graphite powder with a granularity ranging from 3 to 750Mum to be taken as a covering agent, so as to form an excellent protective layer with a thickness ranging from 3 to 40mm on the surface of the molten metal surface in the heat preserving furnace. Compared with the existing rice bran covering agent, the covering agent does not cause environmental pollution, the temperature of the external surface of the heat preserving furnace is reduced by 30 to 50 DEG C, and the slag collecting cycle from the time that a new covering layer is formed to the time that slag has to be collected is extended by 500 to 800 percent, the total ash and slag is reduced by 40 to 80 percent, copper particles in the ash and slag is cut down by 60 to 110 percent, the cycle that the slag attached on furnace wall has to be destroyed is lengthened by 700 to 1400 percent, and the slag is easy to clean up, the service life of the continuous caster is prolonged by 30 to 150 percent. The covering agent of the invention is suitable for such non-Ni copper alloys as red copper, brass, Sn-P bronze for vertical continuous casting, up-drawing continuous casting and horizontal continuous casting, and optimized copper alloy of the invention is suitable for non-Ni copper alloy molten by waste copper for horizontal continuous casting.

The invention discloses a covering agent for smelting copper alloy, which is prepared by adopting the mixture of calcium chloride, potassium chloride, sodium chloride, sodium fluoaluminate and calcium fluoride; one layer of favourable protective layer with the thickness of 5-80 mm is formed on the surface of smelting furnace solution so as to effectively prevent oxygen in air outside a molten pool from entering and avoid oxidation burning loss of alloy elements in the smelting process, and the covering agent has the action of thermal insulation. The covering agent of the invention can ensure that copper alloy requiring vacuum smelting can be smelted under the atmospheric environment. The covering agent of the invention is suitable for smelting copper alloy, such as copper zirconium, copper chromium, copper magnesium, copper chromium zirconium and the like which contain oxidizable elements, and is suitable for ingot blank casting, vertical continuous casting, horizontal continuous casting, up-drawing continuous casting and the like.

The invention discloses a cobalt base alloy for fixing human skeletons. The cobalt base alloy is characterized by comprising the following chemical components in percentage by weight: 22.5-24.5% of Cr, 7-8% of Ni, 11-12% of W, 3-4% of Mo, 0.5-1.5% of Ta, 0.1-0.8% of Si, 0.1-0.5% of Mn, 0.1-0.5% of Nb, 1.0-2.0% of Cu, 0.1-0.2% of N, 0.01-0.08% of Sc+La+Ce, and the balance of Co and inevitable impurity elements. The yield strength of the cobalt base alloy is not less than 710 MPa, the tensile strength is not less than 820 MPa, the elongation is not less than 20%, and the sterilization rate is not less than 93.8%; and all the indexes are obviously higher than that of other products short of alloy elements, products not performing atomized pulverization and similar products not performing surface coating treatment.

A method for preparing magnesium-gadolinium intermediate alloy by using high-intensity ultrasound comprises the following steps: 1) firstly placing pure magnesium ingot into a crucible, heating to be molten, coating rare earth gadolinium with aluminum-foil paper, adding in the pure magnesium melt, and preserving heat at a range of 736-740 DEG C for 36-40min to obtain alloy melt; 2) extending an ultrasound amplitude transformer into the alloy melt for carrying out intermittent type ultrasound treatment, wherein the ultrasound strength is 1.11kw / cm<2>-1.2 kw / cm<2>, the ultrasound time lasts 46-50min, applying time of the high-intensity ultrasound at each time lasts 51-60s, and the intermittence time lasts 51-60s; and 3) refining and purifying at temperature range of 736-740 DEG C, casting and sampling. The magnesium-gadolinium intermediate alloy prepared by using the method has the advantages of being stable in content, capable of effectively avoiding burning loss of the rare earth, and reducing oxidized inclusions, composition segregation and the like, and is simple in process, safe and reliable and convenient to operate.

The invention discloses Ni-Zn high-strength cupronickel alloy and a preparing method thereof. The Ni-Zn high-strength cupronickel alloy is prepared from, by weight, 20-40 parts of Ni, 30-35 parts of Zn, 20-30 parts of Mn, 12-18 parts of P, 4-7 parts of Fe, 5-15 parts of Al and the balance Cu. The performance of the cupronickel alloy is higher, tensile strength and corrosion resistance can better meet the requirement of artware, the specific color intensity and hardness of cupronickel alloy can be maintained for artware produced in the later stage, and environment friendliness is higher and daily use requirements of people are better met. The cupronickel alloy contains zinc which can be dissolved in copper nickel in a solid state to generate a solution strengthening effect, and corrosion resistance is also realized. The cupronickel alloy has high strength and corrosion resistance, high elasticity, attractive appearance and low price, and cost can be saved.

The invention discloses equipment capable of achieving vacuum quantitative casting of molten metal. The equipment comprises a T-shaped cross beam, a vacuum quantitative casting device, a drive and transmission device, a feedback signal receiving device and a control system; the drive and transmission device comprises a four-station drive mechanism which drives an exhaust opening closing plug and a liquid draining opening closing plug to perform reciprocating motion at the same time through a connecting part, and therefore the exhaust opening closing plug and the liquid draining opening closing plug can stay at the different positions, independent opening or closing of an exhaust opening and a liquid draining opening can be achieved, it is ensured that during casing of the molten metal, the oxidation and hydrogen absorption of the molten metal can be reduced, gas holes and oxide inclusion of a casting are reduced, and the casting quality is improved.

The invention provides a welding wire matched with a corrosion-resistant aluminum-magnesium-scandium alloy and a preparation method thereof. The welding wire comprises the following components: 3.0-5.0wt% of Mg, 0.1-0.2wt% of Zr, 0.1-0.2wt% of Sc, 0.2-0.3wt% of Mn, 0.05-0.15wt% of Ti, 0.05-0.25wt% of Cr, 0.01-0.05wt% of Ce, 0.01-0.05wt% of Y and the balance of Al. The preparation method of the welding wire matched with the corrosion-resistant aluminum-magnesium-scandium alloy comprises the following steps: (1) preparing an aluminum-based master alloy; (2) preparing alloy raw materials; (3) refining the alloy; (4) measuring hydrogen content; (5) ingot casting; and (6) extruding and drawing for molding. The invention meets the need for welding production of an aircraft fuel tank and a rocket tank, and welding seams can obtain higher comprehensive mechanical property of joints.

The invention discloses a cobalt-base alloy for an artificial tooth. The cobalt-base alloy is characterized by comprising the following chemical components in percentage by weight: 22.5-24.5% of Cr, 3-4% of Ni, 9-10% of W, 3-4% of Mo, 0.5-1.5% of Ta, 0.1-0.8% of Si, 0.1-0.5% of Mn, 0.1-0.5% of Ti, 1.0-2.0% of Cu, 0.1-0.2% of N, 0.01-0.08% of Sc+Y+La and the balance of Co and inevitable impurity elements. The yield strength of the cobalt-base alloy is greater than or equal to 700MPa, the tension strength of the cobalt-base alloy is greater than or equal to 800MPa, the elongation rate of the cobalt-base alloy is greater than or equal to 18%, the sterilization rate of the cobalt-base alloy is greater than or equal to 92%, and the indexes are remarkably higher than those of other products without alloy elements, remarkably higher than products without flow energy grinded powder, and remarkably higher than similar products without surface coating treatment.

The invention provides a preparation method for a 5-series aluminum alloy welding wire containing rare-earth elements Nd and Ce, and belongs to the technical field of preparation for aluminum alloy welding wires. According to the method, an Al-Nd intermediate alloy and an Al-Ce intermediate alloy are machined into powders or chippings as adding raw materials, and an adding manner of mixing with arefining agent and then carrying out hot-pressing to form a blank is adopted, so that the preparation process is simplified and the cost is saved, oxide inclusions are reduced, and a second phase is uniformly separated out, so that the quality of an aluminum melt is further improved; and air pores of 5-series aluminum alloy are reduced, so that the problems of welding joint hot-cracking, low welding joint strength, low welding joint stability and the like occurring in a welding process are solved, meanwhile, the strength and toughness, the corrosion resistance, the hot workability and other comprehensive performance of the 5-series aluminum alloy welding wire are improved, and a wide market application prospect is achieved.