49results about How to "Lower eutectic temperature" patented technology

A molten salt composition is disclosed containing two or more types of molten salt MTFSI whose anion is an imide anion TFSI and whose cation is an alkali metal M exhibits a lower electrolyte melting point and a wider operating temperature range than a simple salt does. This brings about various advantages such as a wider range of materials that are chosen for use in batteries and the like.

The use of lithium bis(oxalate)borate (LiBOB) as an additive in a lithium secondary battery provides improved battery performance such as long life and high capacity retention after high temperature storage.

The invention discloses a glazed ceramic tile and a preparation method thereof. The glazed ceramic tile is prepared by processing a blank material and glaze, and the blank material comprises the following compositions in percent by weight: 50-75% of anaerobic digestion sludge, 10-25% of clay, 5-15% of wollastonite, and 5-10% of talcum. The glazed ceramic tile preparation method comprises preparing blank and glaze, forming a green body, drying, biscuiting, glazing the green body, performing glaze firing on the green body, and the like. The green body of the glazed ceramic tile is high in strength and small in shrinkage degree when being biscuited, the biscuiting temperature scope of the green body is expanded, and phenomena that the green body surface foams, generates black hearts and is reduced in compressive strength and the like because of too large ignition loss are effectively avoided. The glazed ceramic tile preparation method enables the glazed ceramic tile surface to be solid, flat, free of black heart phenomenon, and high in strength, and also the preparation method is simple and easily controllable in technology, high in yield and high in production efficiency, and production cost is effectively reduced.

Deicing compositions are described for reducing an amount of ice formed on a surface. The deicing compositions may include about 1 wt. % to about 15 wt. % of a salt of citric acid. The compositions may further include about 23 wt. % to about 28 wt. % sodium chloride when the deicing composition forms an aqueous solution.

Lead-free solder alloy. The invention involves an alloy, particularly a lead-free solder alloy. The components weight percentages of the solder alloy are: Silver 0.1%~4.0%, copper 0.1% ~ 2%, Sb 0.002% ~ 0.2% and the rest is tin. The formula of said solder alloy in the invention is reasonable, has characteristics of unleaded, low prices, excellent weldability, it can prevent lead damage the human body when welding; it can replace the solder containing lead and can the prevent the welding silver plate eroded by silver; it is suitable to wave soldering, dip-soldering and reflow soldering,etc.

The invention relates to a long-acting comprehensive treatment process of heavy wall ductile iron. The process comprises: placing ductile iron special pig iron materials and scrap steel in an appropriate amount in a medium frequency induction furnace, and smelting the materials at a temperature between 1350 and 1450DEG C according to the conventional method of: adding 0.1 to 2.0 percent of Cu; then adding 1 to 5 percent of nodulizer into a nodulizing ladle for nodulizing graphite, wherein the compositions of the nodulizer include: 10.0 to 12.0 percent of Mg, 2.0 to 3.0 percent of rare earth, 40.0 to 45.0 percent of Si, 2.5 to 3.0 percent of Ca, 2.5 to 2.9 percent of Ba, less than 1.5 percent of Al, balance Fe; and putting 0.1 to 1 percent of inoculant in a casting ladle in advance and pouring liquid iron into the casting ladle, the compositions of the inoculant have: 70.0 to 75.0 percent of Si, 0.5 to 0.6 percent of Ca, less than 1.5 percent of Al, 1.0 to 1.2 percent of Bi, balance Fe, and finally casting products. The process has the advantages of: improving the form of graphite, reducing degenerating graphite, and obviously improving the nodularity of heavy wall nodular iron and comprehensive mechanical properties of castings.

A method for producing a clinker for cement, comprising grinding a raw flour comprising, especially, Al₂O₃, Fe₂O₃ and SO₃ in contents such that the formula for calculating SO₃ content of=0.261×Al₂O₃−0.638×Fe₂O₃+k, where 2.5<k<3.5, then by sintering flour in an overn wherein the temperature is between 1250° C. and 1350° C. and oxygen content is between 2.5% and 10% by volume.

The invention discloses a manufacturing process of a high-temperature resistant nixing pottery. The manufacturing process comprises the steps of preparing a preform body, moulding, finishing, drying and calcining the preform body, and is characterized in that the preform body comprises the following materials in parts by weight: 5-6 parts of white mud, 4-5 parts of purple mud, 1.5-2 parts of TiO2, and 1.5-2 parts of MgO. A high-temperature resistant nixing pottery vessel prepared from the high-temperature resistant nixing pottery has the advantages of excellent spalling resistance and better mechanical strength, can be directly used on various heat sources, does not crack after being used for a long period of time, and meets the requirements of the fine ceramic cookware standard QB/T2580-2002.

The invention discloses agricultural low-temperature phase change heat storage material and a preparation method thereof. The preparation method specifically includes: mixing crystalized disodium hydrogen phosphate with water, and dissolving under 50-80 DEG C to obtain the aqueous solution of disodium hydrogen phosphate; adding potassium salt and ammonium salt, and dissolving under 30-80 DEG C to obtain mixed liquid; regulating the temperature of the mixed liquid to be 5-30 DEG C; screening the mixed liquid, and drying the screened substances in a blowing drying oven under 20-45 DEG C to obtain the agricultural low-temperature phase change heat storage material. The agricultural low-temperature phase change heat storage material prepared by the method has the advantages that the phase change temperature of the agricultural low-temperature phase change heat storage material is 15.1-34 DEG C, the phase change latent heat range of the agricultural low-temperature phase change heat storage material is 160-200J/g, the condensate depression of the agricultural low-temperature phase change heat storage material is 0.5-2 DEG C, and the agricultural low-temperature phase change heat storage material is high in heat storage and heat discharge efficiency; in addition, the agricultural low-temperature phase change heat storage material is simple in preparation method and applicable to cultivation in facilities such as an agricultural sunlight greenhouse, a multi-span greenhouse and a plastic single greenhouse.

The invention discloses a two-step mode two-temperature transient liquid-phase bonding method for dissimilar metals, wherein the eutectic temperature between an intermediate layer and high-melting point parent metal is 100-400 DEG C higher than that between the intermediate layer and low-melting point parent metal. The method comprises the following steps of: (1) welding one end of the intermediate layer to the high-melting point parent metal at the temperature T1 by using a transient liquid phase bonding method; and (2) welding the other end of the intermediate layer to the low-melting pointparent metal at the temperature T2, wherein the temperature T2 is lower than the melting temperature of the low-melting point parent metal. The two-step mode two-temperature transient liquid-phase bonding method for the dissimilar metals disclosed by the invention can be used for bonding between the dissimilar metals with significant difference for physical, chemical and metallurgical properties,in particular for bonding between the dissimilar metals with a melting point difference value of 300-700 DEG C, the bonding and the sufficient diffusion between the high-melting point parent metal and the intermediate layer are ensured to be realized, and meanwhile, the occurrence of melting and burning loss of the parent metal with a lower melting point in a welding process can be prevented, so that the effective bonding between dissimilar metal weldments is realized.

The invention discloses a resource-saving low-carbon cement clinker and a preparation method thereof, and belongs to the technical field of Portland cement clinker production. The cement clinker comprises the following raw materials in percentage by mass: 45-70% of high-calcium low-magnesium limestone, 10-40% of barren rock, 4-12% of shale or sandstone, 4-12% of slag, 1-3% of sulfate slag or iron slag, 1-3% of fly ash, 0-3% of coal cinder or coal gangue, 0.5-3% of phosphorus slag and phosphogypsum and 0.1-0.3% of an added activating agent. According to the resource-saving low-carbon cement clinker and the preparation method thereof of the invention, a large amount of solid waste is utilized, the adopted industrial waste residue is formed by high-temperature calcination, carbonate hardly exists, and CO2 hardly occurs after high-temperature calcination is performed again; the mixing amount of the industrial waste residues is high, the use amount of limestone is greatly reduced; the mineralization of trace elements in the industrial waste residues is utilized, and the activating agent is added, so that the burnability of the raw materials is improved, the sintering stability of the clinker is reduced, and the performance of the clinker is improved; the firing temperature of the low-carbon cement clinker is reduced by 100-150 DEG C compared with the firing temperature 1450 DEG C of traditional Portland cement clinker, and therefore, the coal consumption is obviously reduced, and the emission of CO2 is reduced.

The invention discloses a low-temperature fast fired marble tile. The low-temperature fast fired marble tile comprises raw materials in parts by weight as follows: 15-35 parts of ultrafine-particle marble tile edging waste, 15-25 parts of kalialbite, 15-30 parts of lithium china stone, 0-25 parts of low-temperature sand, 16-25 parts of clay and 3-10 parts of an auxiliary, wherein the ultrafine-particle marble tile edging waste is the waste produced in a marble tile edging procedure. The raw materials of the tile are easily available, the cost is low, product performance indexes of the low-temperature fast fired marble tile can be guaranteed, and by full use of the characteristics of low melting temperature and fine powder particle of the polishing waste as the waste raw material, sinteringtemperature of the product and energy consumption can be reduced while the waste is used. The invention further discloses a preparation method of the low-temperature fast fired marble tile. The marble polishing waste is separated with a simple process, content of impurities in the polishing waste is reduced, components of the polishing waste are more stable, and industrial production is facilitated.

The invention discloses a fabrication process of low expansion Nixing pottery. The process comprises the steps of blank preparation, blank forming, blank trimming, blank stoving and blank firing. The process of low expansion Nixing pottery is characterized in that the blank prepared from, by weight, 5-6 parts of east mud, 4-5 parts of west mud, 0.5-1 part of NiO, 1.5-2 parts of TiO2 and 1.5-2 parts of MgO. The Nixing dishes prepared through the fabrication process of low expansion Nixing pottery have the advantages of excellent thermal shock resistance, good mechanical strength and capable of being used in various heat sources directly without cracking even after being used for a long period. The Nixing pottery dishes prepared through the process of low expansion Nixing pottery can meet the requirements of QB/T2580-2002 <Fine ceramic cookware>.

A method for joining two large metal surfaces together by inserting a gasket or coating between two sheets of metal and heating to a temperature above the eutectic temperature of gasket or coating and the metal surfaces. This heating will cause the metal surfaces to fuse weld together while being heated to a point below their melting point

The invention discloses flux-cored aluminum brazing filler metal which comprises a brazing flux core and aluminum-based brazing filler metal. The brazing flux core is wrapped with the aluminum-based brazing filler metal. The flux-cored aluminum brazing filler metal comprises, by mass percent, 2.1%-9.2% of AlF3 powder, 1.7%-7.5% of CsF powder, 1.2%-5.3% of KF powder, 11%-25.3% of alloy powder, 4%-8% of Si powder and the balance aluminum-based brazing filler metal. The invention further discloses a preparation method of the flux-cored aluminum brazing filler metal. According to the flux-cored aluminum brazing filler metal, an aluminum-silicon eutectic reaction occurs in the brazing process, the melting point is low, fluidity and spreadability are good, and the brazing seam strength is high.