35results about How to "Reduce the solidification rate" patented technology

The invention provides a high-strength and high-temperature alloy for a thermal power generating unit and a processing technology of the high-strength and high-temperature alloy. The high-strength andhigh-temperature alloy is prepared from the components in percentage by mass: 0.05-0.08% of C, 14-17% of Cr, less than or equal to 0.5% of Mn, less than or equal to 0.5% of Si, 1.0-2.5% of W, 0.3-2.0% of Mo, 2.0-2.5% of Ti, 1.0-1.5% of Al, less than or equal to 0.003% of B, less than or equal to 0.03% of Zr, 37-48% of Fe, and the balance of Ni. The processing technology comprises the steps that an electric-arc furnace is adopted at the vacuum degree not exceeding 0.5Pa to smelt pre-matched alloy furnace charge; the alloy is subjected to cogging forging with the deformation amount reaching 70%within the temperature range of 200-250 DEG C above Ni3Al (gamma') precipitation temperature; and high-temperature rolling with the deformation amount reaching 80% above the precipitation temperatureof 150-200 DEG C. The alloy has excellent high-temperature mechanical properties above 650 DEG C.

The invention discloses a vibration type test tube shaking device which comprises a test tube rack, wherein a chamber is arranged at the side part of the test tube rack in an extending manner. The vibration type test tube shaking device is characterized in that a test tube rolling box is arranged inside the chamber; one end of the test tube rolling box is connected with the inner wall of the chamber; the other end of the test tube rolling box is connected with a motor through a fixing device. The motor is rotated to drive a coupling and a transmission shaft to make regular reciprocation movement leftwards and rightwards under the control of a PLC, so that the test tube rolling box can make regular shaking movement for limited times leftwards and rightwards, and the purpose of uniformly shaking test tubes can be achieved. The vibration type test tube shaking device is small and exquisite, and nursing operators can carry the device conveniently. Specimen without anticoagulant can be put on the test tube rack on the left side, blood specimen uniformly vibrated and shaken can be also put on the test tube rack on the left side, and as a heat supply rotation device is arranged on the test tube rack, the blood cannot be invalid within a relatively long time.

The invention discloses a polycarboxylate water reduction agent having high heat stability modification and a preparation method of the polycarboxylate water reduction agent. The raw materials of thepolycarboxylate water reduction agent mainly comprise methylpropenoic acid, unsaturated polyether, aqueous polyurethane emulsion, hexafluorobutyl methacrylate, polymer colloid of which the concentration is 10-15%, and sodium dodecyl sulfate. According to the polycarboxylate water reduction agent and the preparation method thereof disclosed by the invention, the hexafluorobutyl methacrylate is usedfor performing lyophobic modification treatment on aqueous polyurethane, and is combined with polymer colloid forming sol state to be self-assembled on the surfaces of molecule chains of polycarboxylate, and membrane layers having high dispersion and high heat resistance are formed, can enable cement to have long-time dispersion maintaining capacity, can retard concrete solidification rate of theconcrete in the transportation course, and is high in heat stability, long in action time, environmentally friendly, nonhazardous, convenient to store and transport, extensive in raw material sourcesand suitable for industrial production.

The invention belongs to the field of additive manufacturing, and particularly relates to a substrate-wire cooperative preheating device for arc additive manufacturing and a method thereof. The substrate-wire cooperative preheating device comprises a ceramic sheet heater, a thermocouple temperature sensor, high-heat resistance wires, spiral resistance wires, an infrared temperature sensor and a preheating controller, wherein the ceramic sheet heater is arranged below a substrate; the thermocouple temperature sensor is arranged on one side of the substrate; the high-heat resistance wires are laid in the ceramic sheet heater; the spiral resistance wires are arranged at the periphery of a wire; and the infrared temperature sensor is used for measuring the temperature of the wire heated by thespiral resistance wires. According to the substrate-wire cooperative preheating device for arc additive manufacturing and the method thereof, the substrate is preheated, the macroscopic morphology ofthe first layer of an additive is improved, the metallurgical combination of deposited metal and base metal of the substrate is enhanced, and the solidification rate of molten metal is reduced, so that the escaping of gas in a molten pool is facilitated; and in addition, preheating is synchronously carried out in the wire feeding process of the wire, so that under the condition that a current ofa welding machine is not increased, the metal deposition amount is increased, the oxidation is reduced, and the uniformity of a microstructure is improved.

The invention discloses high-strength gray cast iron and a low Si-Al inoculation process thereof, and relates to the technical field of gray cast iron. The high-strength gray cast iron comprises the following components, in percentage by weight, 3.5-3.8% of C, 1.5-1.9% of Si, 0.01-0.09% of Ti, 1.1-1.33% of Mn, 0.4-0.6% of Cu, 0.63-0.92% of Cr, 0.63-0.92% of Zr, 0.63-0.92% of Ba, 0.17-0.73% of Ni, 1.12-2.21% of Zn, 0.012-0.021% of As, 70-120 ppm of N, 0.03-0.05% of Re, less than 0.12% of P, less than 0.03 of S, less than 20 ppm of Pb, and the balance Fe. Two grades of inoculation agents are added in liquid-state cast iron to form a lot of sub-microscopic cores to accelerate growth of eutectic cells in a liquid phase; when an eutectic solidification temperature is approached, fine graphite flakes are firstly formed in the core growth places, and the eutectic cells are grown; less heat can be released to the surrounding liquid phase due to formation of each eutectic cell; and more eutectic cells are formed, and the solidification speed of the cast iron is lower.

The invention discloses a preparation method of a metallurgical exothermic agent for continuous casting end billets, belonging to the technical field of metallurgical continuous casting. In the present invention, aluminum powder, carbon powder, iron powder, silicon powder, FeO and CaO are configured according to weight percentage, and are stirred and mixed by a mixer; a binder is added therein, and then the mixer is continued to be stirred. Mix well; send the stirred raw materials to a molding machine to be pressed into agglomerates; finally, the agglomerates are dried and cooled naturally to obtain a metallurgical exothermic agent. In the present invention, the metallurgical exothermic agent prepared by the method is added to the crystallizer, and the carbon and aluminum in the metallurgical exothermic agent undergo an exothermic reaction with FeO, so as to provide higher heat for the tail billet when the continuous casting tail billet is solidified, and reduce the energy consumption. The solidification rate of the tail billet shell, and the metal Fe generated at the same time will feed the solidification shrinkage hole in the center of the tail billet, increase the density of the tail billet, improve the quality of the tail billet, and greatly improve the quality of the tail end of the billet, thereby reducing the The cutting amount of the tail end of the continuous casting billet.

The invention discloses a device for automatically adding a metallurgical exothermic agent for continuous casting finishing billets, belonging to the technical field of metallurgical continuous casting equipment. The invention includes a control cabinet, a heating agent silo, a metallurgical heating agent feeding pipe and a nozzle. connected, and the nozzle is located at the edge of the crystallizer; the control cabinet is used to control the addition of the metallurgical heating agent in the heating agent silo to the crystallizer. The present invention adds the metallurgical heating agent into the crystallizer through the automatic adding device, and the whole process is controlled by the control cabinet, so that the metallurgical heating agent is sprayed into the crystallizer from the nozzle along the metallurgical heating agent feeding pipe, and the entire metallurgical heating is controlled The addition time of the agent does not exceed 3 minutes, the whole process requires less human participation, and the degree of mechanization and automation is high. At the same time, it can effectively ensure the performance of the metallurgical heating agent and improve the quality of the casting slab and the yield of molten steel.

The invention relates to an anti-curling low-solidification-rate PU resin and a preparation method thereof. The preparation method comprises the steps: 1, adding polyester polyol into a reaction kettle, adding phosphoric acid, an antioxidant, a dihydric alcohol chain extender and N, N-dimethylformamide, and stirring and mixing the mixture uniformly; 2) adding isocyanate, heating the mixture to 75-80 DEG C, and carrying out a tackifying reaction until the viscosity of the system reaches 200,000-240,000 cps / DEG C; and 3) after the tackifying reaction, adding methanol to terminate the tackifyingreaction, then adding malic acid, stirring the mixture for 1h, and discharging the product. The preparation method provided by the invention adopts a one-step method, the synthesis process is simple and convenient, the prepared PU resin has good resilience, and the PU wet base prepared from the PU resin has the functions of edge curling prevention and low solidification rate.

The invention discloses a feeding device of building concrete, and belongs to the technical field of raw material transporting. The feeding device of the building concrete includes a material inlet bin and a material conveying pipe body communicating with the material inlet bin. The feeding device is characterized in that a baffle is hinged to the top of the inner side of the material inlet bin, afirst connecting rod is hinged to the bottom of the baffle, a second connecting rod is hinged to the first connecting rod, an elastic hinging sheet is fixed to an included angle between the second connecting rod and the first connecting rod, one part of the elastic hinging sheet is fixed to the second connecting rod, the other part of the elastic hinging sheet is fixed to the first connecting sheet to form an elastic buffering assembly, a spring is mounted on the second connecting rod, and the other end of the spring is fixed to the inner wall of the material inlet bin. According to the feeding device of the building concrete, the material inlet bin is sealed, contact between the concrete and air is reduced, the solidified rate of the concrete is lowered, and waste of resources is reduced.

The invention discloses a material mixing and stirring mechanism in industrial construction. The material mixing and stirring mechanism in industrial construction comprises a storage container, a sealing cover and a stirring mechanism, wherein the storage container is rectangular; the upper end side of the storage container sinks inwards to form a rectangular groove; an upper opening of the rectangular groove is sealed by the sealing cover; the upper ends of four side plates of the rectangular groove in the storage container sink inwards to form location notches; the lower end side of the sealing cover protrudes downwards to form a vertical location strip with two ends which are respectively embedded in the location notches in the front side plate and the rear side plate of the rectangular groove and a transverse location strip with two ends which are respectively embedded in the location notches of the left side plate and the right side plate of the rectangular groove; the stirring mechanism comprises a stirring rod; a circular through hole penetrating through the upper end side and the lower end side of the sealing cover is formed in the sealing cover; the lower end of the stirring rod penetrates through the circular through hole and is located in the rectangular groove. Due to the adoption of the structure, the material mixing and stirring mechanism in industrial construction is simple in overall structure, convenient to implement and low in cost; when the material mixing and stirring mechanism is used, materials are stored in the rectangular groove and subsequently mixed; through the stirring mechanism, the coagulation rate of the mixed material is reduced; the waste of resources is reduced.

The invention discloses a preparation method of a polycarboxylic acid high-performance water reducer. The raw materials mainly include methacrylic acid, unsaturated polyether, water-based polyurethane emulsion, hexafluorobutyl methacrylate, polymer colloid, dodecyl Sodium sulfonate; the present invention utilizes hexafluorobutyl methacrylate to carry out hydrophobic modification treatment on water-based polyurethane, and polymer colloid is bonded by chemical bonds through esterification grafting to form polysaccharide graft copolymers at the same time. The surface self-assembly of molecular chains of carboxylic acid forms a film layer with high dispersion and high heat resistance. It has the ability to disperse and maintain cement for a long time, slows down the concrete solidification rate during transportation, and has high thermal stability. Long time, environmental protection and non-toxic, convenient storage and transportation, wide source of raw materials, suitable for industrial production.

The invention discloses a preparation method of a polyacrylonitrile precursor. The method comprises the following steps: (1) spinning a polyacrylonitrile spinning stock solution, injecting the stock solution into a fatty alcohol coagulation bath and solidifying to obtain a primary gel fibre filament; (2) adding the primary gel fibre filament into at least one stage of inorganic salt aqueous coagulation bath and solidifying to obtain a polyacrylonitrile solidified filament; (3) washing the polyacrylonitrile solidified filament and drying to obtain the polyacrylonitrile precursor. Without changing a prior art, the method merely adds a segment of the coagulation bath consisting of fatty alcohol and inorganic salt to obtain the polyacrylonitrile precursor with more compact structure and more excellent performances.

The invention provides a graphite fiber with a laminated cross-section structure and a melt spinning method thereof, comprising the following steps: step 1, using mesophase pitch for melt spinning to obtain fiber precursors; the spinneret hole cross section used for melt spinning It is rectangular, and the outlet chamfer is provided on the long side of the spinneret outlet, and the inner surface of the spinneret is coated with a layer of nickel, silver or platinum metal coating; step 2, the fiber precursors are sequentially subjected to non-melting carbonization and graphitization After processing, graphite fibers with a laminated cross-sectional structure are obtained. The present invention prepares fiber precursors with elliptical cross-sections. After non-melting carbonization and graphitization, the graphite sheets are approximately parallel to the direction of the long side of the fiber cross-section, so that La and Lc of graphite microcrystals can be fully developed. The graphite flakes are less wrinkled and dense, and the thermal conductivity of the final graphite fiber can reach 800-1100W / (m·K).

This case involves an anti-curling low solidification rate PU resin and its preparation method. The preparation method includes: 1) adding polyester polyol to the reaction kettle, adding phosphoric acid, antioxidant, glycol chain extender and N, N-dimethylformamide, stirring and mixing; 2) adding isocyanate, heating up to 75-80°C for viscosity-increasing reaction until the viscosity of the system reaches 20-240,000 cps; 3) adding methanol to terminate the viscosity-increasing reaction, Then add malic acid, and discharge after stirring for 1h. The preparation method of this case adopts a one-step method, and the synthesis process is simple and convenient; the prepared PU resin has good resilience performance, and the PU wet-process bass made of it has the functions of anti-curling and low solidification rate.

A preparation process for high-alumina and titanium deformed superalloys, comprising C: 0.05-0.08%, Cr: 20-24%, Co: 10-15%, Mn: ≤0.5%, Si: ≤0.3%, Nb: 0.3~0.6%, W: ≤5.0%, Ti: 1.5~3.5%, Al: 1.5~3.5%, N: ≤0.03%, B: ≤0.003%, Zr: ≤0.03%, Re: ≤0.1% , the balance being Ni; smelting the pre-alloyed charge under the vacuum degree of no more than 0.3Pa; carrying out blank forging with a deformation amount of 70% in the temperature range of 70‑120 °C above the Ni3Al precipitation temperature; 'High-temperature rolling with a deformation amount of 80% is carried out at 120-160°C above the precipitation temperature. The process cost of the invention is low, and the alloy has excellent high-temperature mechanical properties above 750°C.

The invention relates to a medical Mg-Gd-Zn (-Ca) magnesium alloy with an LPSO structure and a preparation method of the medical Mg-Gd-Zn (-Ca) magnesium alloy with the LPSO structure and belongs to the field of medical magnesium alloy preparation. The medical Mg-Gd-Zn (-Ca) magnesium alloy with the LPSO structure comprises, by mass, 1.0%-3.5% of Gd, 0.3%-1.2% of Zn and 0-1.0% of Ca. The preparation method of the medical Mg-Gd-Zn (-Ca) magnesium alloy with the LPSO structure comprises the steps that raw materials which are in an appropriate ratio are placed in a crucible containing mixed protective gases of CO2 and SF6 in sequence for melting, stirring, standing and casting, wherein during casting, the solidification rate is controlled; and a cast ingot is placed in a resistance furnace with a protective atmosphere for heat treatment, and then rod materials are formed through extrusion. The medical Mg-Gd-Zn (-Ca) magnesium alloy with the LPSO structure has the advantages that the contents of the Gd element and the Zn element are low, the biological safety is high, the cost is low, and the technology is simple. Cast alloy tissue and extrusion alloy tissue both have the LPSO structure. Besides, after Ca is added, a divorced eutectic (Mg, Zn, Ca) 3Gd phase is formed in the cast alloy and is beneficial for the abrasion resistance performance of the alloy, the microstructure is adjustable, and the corrosion resistance of a material can be effectively improved. The medical Mg-Gd-Zn (-Ca) magnesium alloy with the LPSO structure has broad application prospect in the biomedical fields of orthopedics and cardiovascular stent implantation.