5results about How to "Right melting point" patented technology

The invention discloses a high-thermal-conductivity die-casting mold sprue bush with a cooling jacket easy to disassemble and assemble and an assembling method, the high-thermal-conductivity die-casting mold sprue bush comprises a sprue bush body provided with a runner on the inner side and the cooling jacket internally provided with a water channel, a sleeving surface is arranged on the outer side of the sprue bush body, a sleeving hole penetrating through the cooling jacket is formed in the inner side of the cooling jacket, and the sleeving hole is connected with the sleeving surface in a sleeving mode; more than two branch connecting grooves recessed in the sleeving hole and the sleeving surface are formed in the sleeving hole and the sleeving surface, main connecting grooves recessed in the sleeving hole and the sleeving surface are formed between the branch connecting grooves and the sleeving hole and / or between the branch connecting grooves and the sleeving surface, and all the branch connecting grooves are communicated with one another through the main connecting grooves; the main connecting grooves and the branch connecting grooves are filled with hot melting heat conductors. The sprue bush has the advantages of being easy to disassemble and assemble, good in heat conductivity and stable, the response speed of sprue bush temperature control can be increased, and the production efficiency is improved.

The invention discloses a liquid metal-graphite heat storage device for waste heat recovery of a large heat supply unit, and belongs to the technical field of waste heat utilization, the device comprises a communicating pipe and a heat storage tank, the heat storage tank comprises a shell, a heat preservation layer and a graphite block layer, the graphite block layer forms a containing cavity, phase change molten metal is contained in the containing cavity, and the communicating pipe is communicated with the shell; the heat storage tank is provided with a first heat exchange pipe used for being inserted into the phase change molten metal. Waste heat of high-temperature waste gas generated in the working process of a large-scale thermal power heat supply unit can be stored, heat is transmitted to the graphite block through liquid metal, the composite structure can improve the rate and performance of the high-temperature heat storage / release process, the economic cost is reduced, the phase-change molten metal has high thermal conductivity and a moderate melting point, and the phase-change molten metal can be recycled. The heat storage tank is compact in structure, large in energy storage density, simple in structure and reliable in operation, the graphite blocks have high specific heat capacity and good heat stability, and the heat storage device sequentially achieves cascade storage of high-grade heat energy, medium-grade heat energy and low-grade heat energy.

The invention discloses an antioxidant MB-S and a preparation method and application thereof, belonging to the technical field of rubber antioxidants. The technical scheme is: the following structural formula is obtained by synthesizing antioxidant MB, aldehyde compounds and hydroxylamine or its inorganic salt as raw materials in an alcohol solvent under the catalytic action of a catalyst, specifically comprising the following steps: 1) placing antioxidant MB and aldehyde compounds in an alcohol solvent, adding a catalyst, reacting under reflux for 2-6 hours, and generating an intermediate dihydroxymethylated MB; 2) adding hydroxylamine or its inorganic salt, continuing the reflux reaction for 2-6 hours, adding an alkaline solution to neutralize the pH to 6-7, cooling and crystallizing, centrifuging, and drying to obtain antioxidant MB-S. The antioxidant MB-S of the present invention has a low transition state energy with alkane peroxyl radical reaction and has a strong antioxidant ability, which helps to improve the life and performance stability of rubber products and reduce maintenance costs.

This invention discloses a highly efficient degassing refining agent for magnesium alloy ingots and its preparation method in the field of molten metal purification. The refining agent is composed of lanthanum fluoride-supported titanium carbide nanocomposite, calcium zirconate and graphene oxide nanohybrid, and various components such as anhydrous magnesium chloride, anhydrous sodium fluoride, anhydrous potassium chloride, metallic calcium powder, barium carbonate, and alumina micro powder in a specific ratio. Its preparation mainly includes: first, dispersing titanium carbide nanoparticles and reacting them with a lanthanum fluoride-containing solution, followed by hydrothermal treatment and calcination to obtain the lanthanum fluoride-supported titanium carbide nanocomposite; second, mixing a zirconium calcium salt solution with a graphene oxide dispersion, followed by urea co-precipitation, hydrothermal reaction, and calcination under a protective atmosphere to obtain the calcium zirconate and graphene oxide nanohybrid. This invention, through the synergistic effect of two inorganic modifying compounds, can deeply remove hydrogen and inclusions from magnesium melt, thereby significantly improving the metallurgical quality and overall performance of magnesium alloy ingots.

The present application relates to a kind of TR assembly package high thermal conductive eutectic medium temperature solder and foil strip preparation method, belong to microelectronic system packaging field.The solder composition: Sb 10.5~12.5wt%, Sn 0.5~2.0wt%, Ag 0.1~0.5wt%, Cu 0.1~0.5wt%, Pd 0.05~0.2wt%, Ni 0.05~0.2wt%, In 0.01~0.1wt%, P0.002~0.01wt%, the balance is Pb.Its foil strip preparation method includes raw material selection and intermediate alloy preparation, non-vacuum medium frequency induction melting, fast cooling horizontal casting and isothermal rolling step.The alloy melting point is moderate, has high strength, high thermal fatigue and high thermal conductivity etc.;Alloy foil composition is uniform, IMC is small, surface is clean, and the yield is high, satisfies the multistage packaging demand of TR assembly in microelectronic system.