75results about How to "Low liquidus temperature" patented technology

The invention relates to a rigid composite metal panel comprising at least two metal parallel plates and/or sheets secured to the peaks and troughs of a corrugated aluminium stiffener sheet arranged between the parallel plates and/or sheets, wherein the corrugated aluminium stiffener sheet is an aluminium brazing sheet product made from an aluminium brazing sheet product including a core sheet (1) made of an aluminium alloy having on at least one surface of the core sheet clad, and preferably on both sides, an aluminium clad layer (2), the aluminium clad layer being made of an aluminium alloy comprising silicon in an amount in the range of 2 to 18% by weight, preferably 5 to 14%, and a layer (3) comprising nickel on the outer surface of the aluminium clad layer. The invention further relates to a method of manufacturing thereof.

Provided is an optical glass that has high-refractivity and high-dispersion properties and can give preforms for press-molding, which are excellent in shapability at high temperatures and suitable for precision press-molding.

The optical contains, as essential components, 25 to 45 mol % of B₂O₃, 2 to 20 mol % of SiO₂, 5 to 22 mol % of La₂O₃, 2 to 20 mol % of Gd₂O₃, 15 to 29 mol % of ZnO, 1 to 10 mol % of Li₂O and 0.5 to 8 mol % of ZrO₂, the optical glass having a B₂O₃/SiO₂ molar ratio of from 2 to 5.5 and having an La₂O₃ and Gd₂O₃ total content of 12 to 24 mol % and a ZnO and Li₂O total content of 25 to 30 mol %, the optical glass having a refractive index (nd) of 1.75 to 1.85 and an Abbe's number (νd) of 40 to 55, or the optical glass contains, as essential components, B₂O₃, SiO₂, La₂O₃, Gd₂O₃, ZnO, Li₂O and ZrO₂ and has a viscosity of at least 6 dPa·s at a liquidus temperature thereof, a glass transition temperature (Tg) of 600° C. or lower, a refractive index (nd) of 1.75 to 1.85 and Abbe's number (νd) of 40 to 55.

A lead-free solder alloy which has a relatively low melting temperature and which is suitable for soldering electronic devices consists essentially of from 5 to 9 mass % of Zn, from 2 to 15 mass % of Bi, optionally from 0.001 to 1 mass % of P or from 0.001 to 0.1 mass % of Ge, and a balance of Sn. The solder alloy has a liquidus temperature of at most 220° C.

The present invention belongs to the field of aluminum and aluminum alloy connecting material, relates to aluminum brazing material, and is especially one kind of fast cooled Al-Si-Cu-Zn brazing material for brazing aluminum and aluminum alloy and its preparation process. The Al-Si-Cu-Zn brazing material consists of Si 5.0-12.5 wt%, Cu 15.0-30.0 wt%, Zn 2.5-7.5 wt%, Sr 0.001-0.5 wt% and Al for the rest. The Al-Si-Cu-Zn brazing material is prepared through one single roll and fast cooling process. It has melting temperature of 500-525 deg.c and brazing temperature of 530-570 deg.c, and is suitable for brazing aluminum and aluminum alloy with solidus temperature over 530 deg.c.

Provided is a glass sheet, comprising, as a glass composition in terms of mass %, 40 to 80% of SiO₂, 0 to 30% of Al₂O₃, 0 to 15% of B₂O₃, 0 to 25% of an alkali metal oxide (one kind or two or more kinds of Li₂O, Na₂O, and K₂O), and 0 to 15% of an alkaline earth metal oxide (one kind or two or more kinds of MgO, CaO, SrO, and BaO), and being used as a viewing zone control member for covering partially or wholly a two-dimensional display.

The invention discloses a base plate glass with rare-earth element to dope liquid crystal display device (TFT-LCD), which is characterized by the following: comprising glass basic oxide, lanthanum oxide, cerium oxide, neodymium oxide and or yttrium oxide; setting the mass ratio at (60. 5-195):(0. 003-28) of the glass basic oxide and all rare-earth oxide; adding at least three rare-earth oxide; improving the fusion of the glass; accelerating clarification and equalization in the course of formation; preventing glass crystallizer; decreasing the liquid phase temperature; delaying devitrification speed of the glass; fitting for productive technology of float glass; improving chemical stability of the glass; decreasing the expansion coefficient; fitting for large scale float glass procession.

The present invention provides an optical glass which refractivity (nd) and Abbe number (vd) are all located in an expectation range, has less veins and is difficult to bring devitrification, and can be used to form a great-diameter preforming material, a preforming material using the optical glass and an optical element. The optical glass, relative to a gross mass of the glass scaled based on oxide by weight percentage, contains 5.0-35.0% of B2O3, 15.0-50.0% of La2O3, less than 10.0% of Rn2O (Rn is selected from more than one of Li, Na, K) AND 1.0-15.0% of WO3.

The invention discloses road silicate cement clinker on the basis of industrial waste residues and a method for preparing the road silicate cement clinker. The road silicate cement clinker comprises nickel slag, calcium carbide residues, zirconium-containing silica residues, bauxite tailing, desulfurization gypsum and mineralizers. The method includes mixing, grinding and homogenizing the nickel slag, the calcium carbide residues, the zirconium-containing silica residues, the bauxite tailing, the desulfurization gypsum and the mineralizers to obtain cement raw materials; preheating the cementraw materials, then calcining the cement raw materials under the condition of the temperature of 1280-1350 DEG C for 30-35 min and then carrying out cooling to obtain the road silicate cement clinker.The road silicate cement clinker and the method have the advantages that the 28 d compressive strength of the road silicate cement clinker can reach 63.9-75.2 MPa, the strength grade of the road silicate cement clinker can reach 62.5 grade, the 28 d breaking strength of the road silicate cement clinker can reach 9.8-18.2 MPa, the 28 d mortar abrasion loss of the road silicate cement clinker is lower than 2.5 kg/m<2>, cement is high in stability, and the road silicate cement clinker is high in abrasion resistance and excellent in work performance; the method is simple, complicated working procedures can be omitted, and the road silicate cement clinker and the method are low in cost.

The invention provides a magnesium alloy, which comprises the following components in percentage by weight: 0.5-1.5% of calcium, 0.5-2.5% of zinc, and the balance of magnesium, wherein the sum of weight percentages is 100%. The invention also provides a melting process of the magnesium alloy, which comprises the following steps: (1) slicing magnesium ingots and removing impurities, and weighing zinc and calcium for standby; (2) preheating a crucible and a die; (3) putting the magnesium slices into the crucible, putting the crucible in a furnace, and after an operation of vacuumizing is completed, feeding mixed gas into the furnace; (4) heating the furnace until the magnesium slices are completely molten, and heating and stirring the obtained product; (5) wrapping metal calcium with an aluminum foil, adding the obtained object in the bottom of molten magnesium, then adding zinc slices, carrying out stirring and slag removal on the obtained mixture, and after the obtained product is heated, carrying out heat preservation on the obtained product; and (6) cooling molten liquid, carrying out heat preservation on the molten liquid, opening the furnace, taking the die, pouring the molten liquid into the die, and waiting. The invention also provides a heat treatment process of the magnesium alloy, which comprises the following steps of (1) homogenized annealing; and (2) solid solution treatment. The magnesium alloy disclosed by the invention has the advantages that the mechanical properties of the alloy are improved, the casting performance is improved, and the creep resistance of the alloy is increased.

An apparatus and method for processing liquid slag and baghouse dust from a steelmaking furnace such as an EAF to recover valuable metals from the slag and dust includes a treatment vessel having a movable lower shell portion for receiving liquid slag and an upper shell portion that couples with the movable lower shell portion during heat activation of the treatment vessel. The slag is combined with silicon dioxide, a reducing agent, baghouse dust, and an inert gas before being heated to between approximately 1400° C. and 3000° C. The heat treatment results in a molten reduced iron and manganese metallic material, a treated slag layer, and an off-gas containing lead, zinc, and carbon monoxide. The off-gas is combusted, cooled, and solidified, resulting in lead oxide and zinc oxide. The slag layer is tapped, cooled, and solidified. The metallic layer is tapped for recycle in the steel making process.

The invention relates to the field of glass and particularly relates to alkali-free silicate glass and a preparation method and application thereof. The alkali-free silicate glass comprises, by mole, 65-75 mol% of SiO2, 11-17 mol% of Al2O3, Ga2O3 and GeO2, 0-8 mol% of B2O3, 0-15 mol% of MgO, 2-10 mol% of CaO, 0.5-14 mol% of SrO and BaO, 0-10 mol% of TiO2, 0.01-2 mol% of Ta2O5 and 0.01-0.5 mol% of Tl2O3. The alkali-free silicate glass has high thermal stability and dimensional stability, a high strain point, a high specific modulus, a low melting temperature, a low liquidus temperature and low density and is suitable for large-scale industrial production.

A brazing alloy comprising elemental silver alloyed with elemental silicon in a silver/silicon ratio between about 95/5 and 99/1, preferably about 97/3. Small amounts of silicon alloyed with silver depress the alloy liquidus curve significantly, the liquidus temperature of a silver and silicon eutectic alloy being about 837° C. Brazing alloys in accordance with the invention are useful in bonding ceramics to ceramics, ceramics to metals, and metals to metals. Copper, vanadium, or other oxygen-reactive surface bonding elements may also be included. Silver/silicon alloys are useful in applications such as assembly of components of solid oxide fuel cells. A variety of silver/silicon alloy brazes can be used within the same fuel cell so that subsequent brazing can be performed without reliquifying a previous braze. A brazing alloy comprising elemental silver and ruthenium in a silver/ruthenium ratio between 97/3 and 99/1 is also included.

The invention discloses a magnesium alloy casting. The magnesium alloy casting is characterized by being composed of, by weight, 2.6%-4.2% of Si, 0.85%-1.5% of Cu, 1.3%-6% of Al, 0.2%-0.8% of W, 0.1%-0.5% of Mn, 2%-5% of Y, 0.1%-0.2% of Pr, 0,1%-0.15% of Ti, 0.05%-0.08% of Zr, 0.3%-0.7% of Nd, and the balance Mg and inevitable impurities. According to the magnesium alloy casting, magnesium oxidation can be avoided, the overall hardness, tensile strength, yield strength and elongation of Mg alloy are greatly improved by adding function salt and melt in the magnesium alloy casting.

The invention relates to a method for preparing nuclear medicine diagnostic reagent oxygen-18 water and a device thereof. The method comprises the steps of: utilizing an oxygen isotope water industrial rectifying separation device to obtain deuterium oxygen 18 doubly-labelled water as material; carrying out steps of electrolysis, purification and filtering to obtain high-purity deuterium and high-purity oxygen-18 gas; adopting a high-temperature platinum mesh to carry out catalyzing so as to lead the high-purity deuterium to react with the high-purity oxygen-18 gas at high temperature to generate deuterium water; and adopting the high-temperature platinum mesh to carry out catalyzing to lead the high-purity oxygen-18 gas to directly react with high-purity hydrogen to obtain the highly-purified oxygen-18 water adopted as the diagnostic reagent of nuclear medicine. Compared with the prior art, the invention which not only can make full use of the deuterium oxygen 18 doubly-labelled water to prepare the nuclear medicine diagnostic reagent oxygen-18 water and utilize by-product deuterium to prepare deuterium water but also can reduce process steps, enhance quality and yielding of oxygen-18 water of nuclear medicine and reduce product cost really has simple process and better effect.

An electrolytic cell for aluminum electrolysis includes a cell body, in which an anode and a cathode are arranged inside the cell body, the cell body is filled with an electrolyte, and at least a part of the anode is immersed in the electrolyte; the anode is arranged above the cell body, the cathode is arranged at the bottom of the electrolytic cell and is covered by aluminum liquid, the electrolyte is located between the anode and the cathode and covers the aluminum liquid; and an insulating layer is arranged on the inner sidewall of the cell body for isolating oxygen or the electrolyte from a carbon block. The anode contains Fe and Cu as primary components; and the electrolyte is composed of 30-38 wt % of NaF, 49-60 wt % of AlF₃, 1-5 wt % of LiF, 1-6 wt % of KF and 3-6 wt % of Al₂O₃, and the molar ratio of NaF to AlF₃ is 1.0-1.52.

A magnesium alloy according to the present invention comprises: Al in an amount of from 2 to 6%; Ca in an amount making a compositional ratio (i.e., Ca/Al) being from 0.5 to 1.5; Mn in an amount of from 0.1 to 0.7%; strontium (Sr) in an amount of from 1 to 6%; and the balance being magnesium (Mg), and inevitable impurities and/or a modifying element; when the entirety is taken as 100% by mass. By means of this setting, Mg alloys, which are also good in terms of high-temperature characteristics, such as creep resistance and heat conductivity, in addition to ordinary-temperature characteristics, are obtained.