36results about How to "Lower freezing temperature range" patented technology

The invention discloses a full-automatic submerged-arc welding solid-core welding wire for high-manganese steel for preparing an LNG storage tank. According to the technical scheme, the full-automatic submerged-arc welding solid-core welding wire comprises 0.25-0.45wt% of C, 23-26wt% of Mn, 6-8wt% of Ni, 3-5wt% of W, 0.02-0.04wt% of N, less than or equal to 0.02wt% of P, less than or equal to 0.001wt% of S and the balance of Fe and inevitable impurities. The full-automatic submerged-arc welding solid-core welding wire has the advantages that the price of adopted alloy elements is low, and an alloy component system is simple; and the low-temperature toughness of weld metal formed by the prepared full-automatic submerged-arc welding solid-core welding wire is excellent, the strength of the full-automatic submerged-arc welding solid-core welding wire is matched with the strength of the ultralow-temperature high-manganese steel for preparing the LNG storage tank, and the technical requirements for the strength and the ultralow-temperature toughness of the welded LNG storage tank can be met.

The invention discloses a high-efficiency submerged arc welding metal powder-cored flux-cored wire used for ultra-low-temperature high-manganese steel, the high-efficiency submerged arc welding metalpowder-cored flux-cored wire is composed of a steel strip and a metal powder core, the chemical composition of the steel strip is as follows: C is 0.20-0.23 wt%, Si is 0.03-0.05 wt%, Mn is 6-8 wt%, P<=0.002 wt%, S <=0.001 wt%, the balance is Fe and unavoidable impurities. The chemical composition of the metal powder core is as follows: 18-20wt% of electrolytic manganese, 3-4wt% of manganese-silicon alloy, 8-10wt% of nickel powder, 6-8wt% of low-carbon ferrochromium, 4-6wt% of tungsten powder, 2.0-3.0 wt% of potash feldspar, and the balance of iron powder, and the total component content is 100%. The invention can meet the technical requirements for the strength and ultra-low temperature toughness of the welded LNG storage tank.

The invention discloses a casting process for a high-temperature water-pressure-resisting combined flange. The cast high-temperature wear-resisting combined flange mainly comprises a flange body. The flange body is composed of a first flange plate and a second flange plate. The shape and the size of the second flange plate are the same as those of the first flange plate. The first flange plate and the second flange plate are each of a saddle-shaped structure. Threaded holes and through holes are evenly distributed in the first flange plate and distributed at intervals. The two ends of the first flange plate extend outwards to form fixing edges. Fixing holes are formed in the fixing edges. At least two lug plates are arranged on the edge of the outer side of the first flange plate. The first flange plate and the second flange plate are connected together in a fastened manner through bolts after butting the fixing holes in the fixing edges, and the first flange plate and the second flange plate are connected in the fastened manner to form a mounting hole. The casting process is simple and easy to implement. The cast combined flange is simple in structure and has good high-temperature water-pressure-resisting performance, the service life of the flange is prolonged, and cost is lowered.

The invention relates to the technical field of preparation of macromolecular materials and particularly relates to a method for preparing a heat-resistant hydrophobic type water-based ink binder. According to the method, a modified acrylic emulsion serves as a substrate, modified carbon nanotube powder and modified boric sludge powder serve as accelerants, and a polyoxyethylene-polyoxypropylene copolymer, potassium persulfate and the like are added as auxiliaries, so as to prepare the heat-resistant hydrophobic water-based ink binder; firstly, acrylic resin is modified and is effectively charged inside the water-based ink binder, and thus, the heat resistance, adhesive power and hydrophobicity of the water-based ink binder can be improved; plant essential oil is extracted from rose petalsby using a steam distillation method, and the modified carbon nanotube powder, the plant essential oil and the yoghurt are subjected to blended fermentation, so that the compatibility of the carbon nanotube powder and the substrate is improved; the boric sludge powder is used for reacting with a homemade dispersion solution, and thus, the heat resistance of the water-based ink binder is further improved, so that the water-based ink binder has an extensive application prospect.

The invention relates to the technical field of preparation of ceramic glass, and in particular relates to a preparation method for low-temperature sintered type ceramic glass. The method uses precipitate powder and modified ultrafine aluminium oxide powder as basic glass, uses modified boron mud powder and sheep bone powder as nucleating agents, and uses a rare earth oxide and sodium chloride asclarifying agents, and the basic glass, the nucleating agents and the clarifying agents are mixed for a reaction to obtain the low-temperature sintered type ceramic glass. According to the method provided by the invention, a precipitate obtained by centrifugation in sludge is calcined under high-temperature conditions to obtain the precipitate powder, ultrafine aluminium oxide powder is modified by a silane coupling agent, in the low-temperature sintering process, the modified ultrafine powder is formed, so that the sintering speed of the ceramic glass is improved; and boron mud powder and a self-prepared dispersion liquid are mixed, the mixed solution is uniformly dispersed on the surface of the basic glass, then the sheep bone powder is added, and the situation that the sheep bone powderis rich in phosphorus element matter is utilized, so that a final precipitated crystal has a more compact and uniform structure, the dimensional uniformity of the ceramic glass is further improved, and the method has wide application prospects.

The invention discloses single-phase alpha magnesium-lithium alloy with excellent high-temperature mechanical performance and a processing technique of the single-phase alpha magnesium-lithium alloy. The single-phase alpha magnesium-lithium alloy is prepared from the following ingredients by weight percent: 2.0 to 6.0 percent of Li, 0.2 to 0.4 percent of Ca, 0.1 to 0.3 percent of Hf, 0.1 to 0.3 percent of Mo, 0.1 to 0.4 percent of Pb, 0.1 to 0.2 percent of Th, and the balance of magnesium. The invention provides a solution of a novel materials science for the sharp decrease and worsening of mechanical performance of the magnesium-lithium alloy at about 100 DEG C. The material has the mechanical performance of the traditional magnesium-lithium alloy: the elastic modulus is 50 to 70 GPa, the yield strength is 90 to 120 MPa, the tensile strength is 140 to 160 MPa, and ductility is 6 to 18 percent. The single-phase alpha magnesium-lithium alloy has the high-temperature mechanical performance that the traditional magnesium-lithium alloy does not have: the yield strength is 140 to 150 MPa at a temperature lower than 100 DEG C, and the yield strength of the traditional magnesium-lithium alloy is 65 MPa at a temperature lower than 100 DEG C. While the high-temperature mechanical performance is ensured, the service life of the alloy is further prolonged, and the industrialized mass application is facilitated. The magnesium-lithium alloy of the invention can be used at the temperature lower than 100 DEG C and has a significant light-weight effect.

In order to solve the problems that an aluminum alloy part obtained through existing additive manufacturing is prone to having the hot crack defect, and the material formability and the mechanical property are affected, the powder for additive manufacturing is provided and comprises, by weight, 92-98 parts of aluminum alloy powder and 2-8 parts of nano Ni powder. Wherein the average particle size of the aluminum alloy powder is 1-100 microns, and the average particle size of the nano Ni powder is 10-800 nanometers. Meanwhile, the invention further discloses a preparation method and application of the powder for additive manufacturing. According to the powder for additive manufacturing, the laser input efficiency is improved, meanwhile, hot cracks of an aluminum alloy part obtained through additive manufacturing are effectively reduced, and the mechanical property of the aluminum alloy part is improved.

The invention discloses high-strength corrosion-resistant Pb-Li-Si lead-lithium alloy for a shielding material and a processing technology thereof. The alloy comprises the following components of, byweight, 0.4-2.5 wt.% of Li, 1.8-3.6 wt.% of Si, 1.4-2.3 wt.% of Bi, 0.8-1.2 wt.% of Ni, 0.2-0.4 wt.% of Sn, 0.1-0.2 wt.% of La and the balance lead. The lead-lithium alloy has the high strength and the corrosion resistance which are not possessed by the lead alloy used by the traditional shielding material. The alloy and the method can be effectively applied to the fields of nuclear reactors, medical radiation source shielding, nuclear waste treatment and the like; and the production process is simple, the equipment requirement is low, and the large-scale industrial application is faciliated.

The invention discloses a white-cooper alloy with light-weight characteristics used for Tibetan area buddha casting and a process of the white-cooper alloy. The alloy comprises the following components of, in percentage by weight, 1.5 wt.%-3.0 wt.% of Li, 8.0 wt.%-12.0 wt.% of Mg, 0.2 wt.%-0.4 wt.% of Sc, 5.0 wt.%-6.0 wt.% of Bi, 5.0 wt.%-8.0 wt.% of Ni, 20.0 wt.%-28.0 wt.% of Al, 2.0 wt.%-3.0 wt.% of Au, 8.0 wt.%-10.0 wt.% of Ag and the balance copper. The material provides a light-weight solution for the white-cooper alloy used for Tibetan area buddha casting, and the appearance of the obtained product has a white impression. The implementation and industrialization of the material can effectively promote the updating and industry upgrading requirements of new materials in the religiousdecoration industry in China.

The invention discloses a high-strength low-temperature-resistant Pb-Li-Mn lead-lithium alloy for a shielding material and a processing technology thereof. The alloy comprises the following components, by weight percentage: 0.8-2.4wt% of Li, 0.6-1.8wt% of Mn, 0.2-0.4wt% of Se, 0.6-1.5wt% of Cr, 0.2-0.4wt% of Ba, 0.6-0.9wt% of In and the balance Pb. The lead-lithium alloy has the high strength which a traditional lead alloy for a shielding material does not have, and excellent plasticity can be achieved at extremely low temperature. The lead-lithium alloy is applied to the fields of nuclear reactor polar environment, medical radioactive source shielding, nuclear waste treatment and the like in the polar environment, safe operation of a nuclear reactor system can be effectively guaranteed, and the service life of the system can be prolonged.

The invention discloses a high-thermal-conductivity Co-containing lead-lithium alloy with the excellent die-casting performance and a processing technology thereof. The lead-lithium alloy comprises the following components of, by weight, 1.2-1.8 wt% of Li, 0.8-1.2 wt% of Co, 0.2-0.4 wt% of Y, 0.3-0.5 wt% of In, 0.2-0.4 wt% of Eu, 0.4-0.8 wt% of Mn and the balance lead. Compared with a lead alloy for a traditional shielding material lacking excellent casting performance, the lead-lithium alloy has the excellent casting performance and the high thermal conductivity; and the Co-containing lead-lithium alloy and the processing technology thereof can be widely applied to the military and civilian fields and are significant.

The invention discloses a high-strength and high-temperature-resistance Pb-Li-Hf lead lithium alloy for a shielding material and a machining process thereof. The alloy comprises the following components in percentage by weight: 0.8-2.0 wt.% of Li, 1.2-1.6 wt.% of Hf, 0.4-0.8 wt.% of Te, 1.2-1.6 wt.% of Co, 0.2-0.5 wt.% of Cu, 0.1-0.2 wt.% of Pr, and the balance of lead. The lead lithium alloy achieves high strength and high-temperature resistance, which are not owned to a lead alloy for a traditional shielding material. The lead lithium alloy can be effectively applied to the field of nuclearpiles, medical radioactive source shielding, nuclear waste treatment and the like. The production process is simple, low in equipment requirement and convenient for large-scale industrial application.

The invention relates to the technical field of bearing alloys, in particular to a preparing method for a tin-based bearing alloy. The preparing method comprises the following steps that a, a pure tiningot, a pure copper ingot, a pure antimony ingot, a pure aluminum ingot and the like are subjected to burdening according to the mass percent content of various components in the tin-based bearing alloy; b, 1/2 of the pure tin ingot in the above accessories is placed at the bottom of a crucible, then, 50% of a tin-silicon alloy, 10% of a tin-titanium alloy and pure boron powder are sequentiallyadded, after heating melting, the left pure tin ingot is added for temperature adjusting, and finally, the pure copper ingot, the pure antimony ingot and the pure aluminum ingot are added; c, when theheating temperature is stably increased to 500-550 DEG C, a comprehensive treatment agent can be added for refining modification treatment, and standing is conducted for a period of time after drossing; and d, a steel ingot die is preheated, alloy tin liquid obtained through the step c is poured into the steel ingot die, and cooling is conducted to the room temperature. According to the preparingmethod, the solidification temperature range can be narrowed, mobility is improved, dispersed shrinkage is reduced, the content of gas in the alloy liquid is reduced, and the air hole defect in castings is reduced.

The invention discloses a single-phase β-magnesium-lithium alloy with excellent high-temperature mechanical properties and a processing technology thereof. In terms of weight percentage, the composition of the alloy is: Li:12.0‑18.0wt.%, Fe:0.1‑0.6wt.%, Cr:0.1‑0.2wt.%, Co:0.1‑0.2wt.%, Gd:0.1‑ 0.2wt.%, Er: 0.1‑0.2wt.%, the balance is magnesium. The invention provides a novel material science solution to the sharp decrease and deterioration of the mechanical properties of the current magnesium-lithium alloy at about 100 degrees Celsius. The material has the mechanical properties of traditional magnesium-lithium alloys: the elastic modulus is 50-70GPa, the yield strength is 90-120MPa, the tensile strength is 140-160MPa, and the elongation is 6-18%. And it has high-temperature mechanical properties that traditional magnesium-lithium alloys do not have: at 100 degrees, the yield strength is 140-150MPa, while the traditional magnesium-lithium alloy has a yield strength of about 65MPa at 100 degrees. The smelting and processing method of the casting magnesium-lithium alloy is simple, and the production cost is relatively low. While ensuring high-temperature mechanical properties, the service life of the alloy is further improved, which is convenient for large-scale industrial application. The magnesium-lithium alloy of the present invention can be used for manufacturing at an operating temperature below 100 degrees, and has an extremely significant lightening effect.