21 results about "Melting Point Temperature" patented technology

The invention belongs to the technical field of preparation of soft magnetic composite materials, and particularly relates to an insulation coating method and application of a soft magnetic powder material. The insulating coating method comprises the following steps: (1) uniformly mixing low-melting-point metal or alloy powder with silica sol, a silane coupling agent and a thermocuring resin glue solution to obtain coating slurry; and (2) uniformly mixing soft magnetic powder with the coating slurry obtained in the step (1), firstly performing hot-pressing curing molding at the temperature of 60-100 DEG C under a vacuum condition, and then performing hot-pressing sintering treatment at the temperature higher than the melting point temperature of low-melting-point metal or alloy powder and under an oxygen-containing atmosphere condition to obtain the insulated and coated soft magnetic powder material. According to the insulating coating method, the advantages of an organic material insulating coating method and an inorganic material insulating coating method are combined, the defects of the organic material insulating coating method and the inorganic material insulating coating method are overcome, and the stability and the insulating coating effect of the insulating coating layer are remarkably improved.

The invention discloses a method for arranging the mounting position of an aviation airplane wheel thermal fatigue early warning device, and relates to the technical field of airplane braking airplane wheels. The method comprises the following steps: acquiring a first lowest temperature corresponding to 10% attenuation of tensile strength of an airplane wheel assembly material, and acquiring a second lowest temperature corresponding to 20% attenuation of tensile strength of the airplane wheel assembly material; based on the temperature of each thermal display unit on the thermal fatigue early warning devices, a plurality of thermal fatigue early warning devices are arranged at equal intervals on the circumference with the stress smaller than 85% of the tensile strength of the airplane wheel assembly material by calculating the fixed rim of the airplane wheel assembly under the radial-lateral design load working condition. The thermal display units with different melting point temperatures are respectively arranged, and whether the airplane wheel is overheated or not is judged by visually observing the use temperature of the airplane wheel.

The application belongs to the technical field of soft magnetic composite material preparation, and particularly relates to an insulation coating method for soft magnetic powder material and application. The insulation coating method comprises the following steps: (1) uniformly mixing low-melting-point metal or alloy powder, silica sol, silane coupling agent and hot curing resin glue solution to obtain coating slurry; (2) uniformly mixing soft magnetic powder and the coating slurry of step (1), and then performing hot-pressing curing forming at a temperature of 60-100 DEG C and under vacuum condition, and then performing hot-pressing sintering treatment under a temperature higher than the melting point of the low-melting-point metal or alloy powder and under an oxygen-containing atmosphere condition to obtain the insulation-coated soft magnetic powder material. The insulation coating method of the application combines the advantages of the organic material insulation coating method and the inorganic material insulation coating method, overcomes the respective defects, and significantly improves the stability and insulation coating effect of the insulation coating layer.

The application discloses a kind of thermoplastic composite high-efficiency additive manufacturing device and forming method, preheating method includes first preheating stage: resin matrix is preheated to 10-30 ℃ below resin matrix glass transition temperature;Second preheating stage: resin matrix is preheated to higher than resin matrix glass transition temperature and lower than the melting point temperature of resin matrix;Third preheating stage: resin matrix is preheated to 20-50 ℃ higher than the melting point temperature of resin matrix.First preheating stage, can dry the moisture on the surface of printing filament;Second preheating stage, improve fluidity;Third preheating stage, promote resin matrix melting, reach flowing state, carry out sufficient infiltration to fiber, with good plasticity simultaneously, improve the print feasibility, for FDM laying forming process, it can improve the interlaminar adhesion of printed part, reduce porosity, to improve the comprehensive mechanical properties of printed product in turn.In addition, since the fluidity of resin matrix increases, printing speed can also be improved.

The invention described herein relates to non-woven mats and to methods for making same. The mat is formed from fibres that comprise a first polymeric material. The mat comprises a flange-portion (3) that is of greater density than the remaining portion of the mat and that further comprises a second thermoplastic polymeric material having a melting-point temperature that is lower than the melting-point temperature of the first polymeric material. The mats can be used in the formation of plates used in rotating biological contactors (RBCs). Other examples of applications include the formation of air filters, demisters and floating treatment wetlands.

The application discloses a preparation method of a deuterium ice shell layer in a millimeter-scale microsphere, and is based on a frozen target device to realize that a target pellet is hung in the center of a sleeve of the frozen target device through a deuterium gas inflation pipe, gaseous deuterium in the target pellet is converted into liquid deuterium and then into polycrystalline solid deuterium through temperature and pressure control, a temperature gradient is applied to upper and lower silicon cooling arms to sublimate and desublimate polycrystalline solid deuterium in the southern hemisphere of the target pellet to the northern hemisphere to form a relatively uniform deuterium ice layer, and the temperature of the upper and lower silicon cooling arms is simultaneously increased to the melting point temperature of the deuterium ice layer to form a deuterium layer coexisting with solid and liquid on the inner surface of the target pellet. The method can form a smooth, uniform and high-quality deuterium layer coexisting with solid and liquid in the target pellet, the average thickness of the obtained deuterium layer is 35.9 microns, the thickness PV value is 4.02 microns, and the inner surface roughness is 1.0 micron, so that the uniformity and smoothness of the deuterium layer in the target pellet are greatly improved.

The invention discloses a production and preparation method for reducing precipitation of Cu on the surface of weather-resistant profile steel. A heating furnace process is as follows: the preheating temperature of a heating furnace is less than or equal to 750 DEG C, and the preheating time is more than or equal to 30 minutes and less than or equal to 45 minutes; the heating temperature of the heating section I is larger than or equal to 1150 DEG C and smaller than or equal to 1220 DEG C, and the heating time is larger than or equal to 1 h and smaller than or The heating temperature of the heating section II is larger than or equal to 1230 DEG C and smaller than or equal to 1260 DEG C, and the heating time is larger than or equal to 40 min The soaking temperature is greater than or equal to 1240 DEG C and less than or equal to 1260 The soaking time is more than or equal to 30 minutes and less than or equal to 40 The atmosphere in the heating furnace is a reducing atmosphere; and the BD blooming temperature is not less than 1160 DEG C and not less than 1130 DEG C. By reasonably controlling the temperature and time of each stage of the heating furnace, the situation that Cu stays for a long time in a melting point temperature section is avoided, meanwhile, Cu is fully dissolved in steel austenite through high temperature, and precipitation of Cu on the surface of the weather-resistant H-shaped steel is effectively reduced.

The invention provides a flip chip packaging method, which comprises the following steps of: coating a welding window of a chip formed on a wafer with first welding flux, so that a first end of a welding column is welded and fixed with the welding window; filling a curing agent between the welding columns, polishing the welding columns to enable the second ends to be in the same plane, removing the curing agent after a weldable layer is manufactured on the end surfaces of the welding columns, and fixing the second ends of the welding columns with the frame or the substrate coated with the second welding flux to enable a glue filling gap to be formed between the second ends of the welding columns and the chip; filling epoxy resin into the glue filling gap and wrapping the chip; the first solder is higher than the melting point temperature of the second solder. According to the invention, the welding columns are arranged on the core welding window, so that the glue filling gap is formed between the chip and the frame or the substrate, and the epoxy resin can directly flow into the glue filling gap and wrap the chip during one-time filling of the epoxy resin, so that the glue filling frequency is reduced compared with a process needing to fill bottom glue, and the production efficiency is improved. The internal stress generated by different curing degrees of the glue with different filling times is reduced, so that the production steps are simplified, and the production efficiency is improved.

A laser cutting device and method are provided that can cut a workpiece having thermal brittleness to a desired thickness. [Solution] The cutting device of the present invention includes a laser generating unit that generates a laser beam that passes through the surface of the workpiece and is only partially absorbed; a beam generating optical unit that focuses the laser beam into a shape that is parallel to the surface of the workpiece to the depth at which it is intended to cut on the surface of the workpiece and extends perpendicular to the cutting direction, generating a laser beam that heats the workpiece to a temperature below its melting point so as not to melt the cut surface and that will generate internal stress that will separate the cut location in the workpiece; and a start point generating unit that generates damage at the cut start point on the outer edge of the cut surface at which it is intended to cut the workpiece.By providing a configuration that cuts the workpiece without melting it and with reduced damage, it is possible to cut a workpiece that has thermal brittleness to a desired thickness using a slice method.

The invention discloses a distributed temperature measuring device and method for dissecting a blast furnace, belongs to the technical field of blast furnace dissecting, and is suitable for special smelting conditions such as a hydrogen-rich blast furnace. The device comprises a plurality of graphite protective metal sheet temperature measurement unit bodies, each unit body adopts compact high-purity graphite to make a box-type or ball-type protective shell, mutually separated accommodating cavities are arranged in each unit body, and temperature measurement metal sheets with different melting points are arranged in the accommodating cavities. During use, the temperature measuring units are put into a blast furnace target area along with furnace charge, and after the blast furnace is cooled and dissected, the temperature interval of the corresponding area is judged by observing the melting state of the metal sheet. Synchronous and accurate detection of the temperatures of different areas of the blast furnace is achieved, temperature field information in the furnace is effectively reserved, severe environment interference in the furnace is resisted, the problems that a traditional temperature measurement mode is insufficient in accuracy, and temperature information is difficult to retain are solved, and reliable data support is provided for research of a hydrogen-rich smelting thermal field.

An insulator tube armored heating tube with a low-melting-point alloy as a resistance heating body is characterized in that the low-melting-point alloy is filled into an insulator tube with a certain length and a certain section geometric dimension, so that the low-melting-point alloy in the insulator tube has a certain resistance value, and metal electrodes are inserted into the two ends of the insulator tube to be in contact with the low-melting-point alloy; one end of the metal electrode is in contact with the low-melting-point alloy, and the other end extends out of the insulator tube and is sealed and packaged to form an insulator tube armored heating tube; after the metal electrode is electrified, the solid-state low-melting-point alloy is used as a resistor body to be heated to be molten, solid-liquid phase change heat storage is performed, and the temperature of the low-melting-point alloy is always at the melting point temperature of the low-melting-point alloy through temperature control; a plurality of insulator tube armored heating tubes with the low-melting-point alloy as the resistance heating body are connected in series, in parallel or in series-parallel composite connection to form a large-area heater; the heating mode of the insulator tube armored heating tube with the low-melting-point alloy as the resistance heating body on a heated object is a combined mode of a non-contact infrared radiation heating mode, a direct contact heat conduction mode and an infrared radiation heating mode. The infrared radiation heating mode is infrared heating of the tube wall of the composite material insulator tube mixed with the high infrared radiation composite oxide powder to a heated object, and infrared heating of the tube wall of the composite material insulator tube mixed with the high infrared radiation composite oxide powder to the heated object, and high infrared radiation composite oxide particles doped in the low-melting-point alloy to the heated object.

The application discloses a hollow blade profile shape optimization processing device and processing method, and belongs to the technical field of precision casting of aero-engine parts, and comprises the following steps: weighing a proper amount of filling wax, and placing the filling wax in a heating container; opening a heating switch, so as to avoid that the filling wax is heated sharply, and the heating power is controlled to be about 30 min to melt the wax material; measuring the temperature of the filling wax, and controlling the temperature to be in a temperature interval of 1.1-1.2 times of the melting point; using a small metal spoon with a nest to scoop a small amount of liquid filling wax, and pouring the liquid filling wax into a gap of a core, and the liquid filling wax is solidified in 5-10 s; repeating the above operation to fill the specified gap of the core; finally, using a scraper to scrape off the excess filling wax, and ensuring that the filling wax and the core surface transition is smooth. The application pre-pours the wax liquid into the gap of the core, and then carries out wax mold pressing, so that the generation of local deformation of the wax mold surface can be effectively avoided.

The invention relates to the technical field of photovoltaic modules, in particular to an easy-to-disassemble recyclable photovoltaic frame module, a separation method thereof and a photovoltaic module. The photovoltaic frame assembly comprises a plurality of frames and a plurality of corner connectors. Each frame is provided with an installation cavity, each corner brace comprises two corner brace arms which are perpendicularly connected, and each corner brace arm comprises a fixing section and an inserting section. A limiting piece is installed on the inner side of the fixing section, and the side, opposite to the fixing section, of the limiting piece is of a sawtooth structure. The corner brace arm is used for being inserted into the mounting cavity, and the sawtooth structure of the limiting piece abuts against the inner wall of the mounting cavity and is fixed to the frame when the corner brace arm is inserted into the mounting cavity. The limiting piece is made of low-melting-point alloy, and the melting point of the limiting piece is lower than that of the frame; the limiting piece is used for being softened or melted to be separated from the frame when the heating temperature reaches the melting point temperature of the limiting piece. According to the photovoltaic frame assembly corner connector provided by the scheme, on the premise that a conventional aluminum frame assembly mode is not changed, compatibility of high-strength fixation and batch reversible disassembly is achieved.

The invention relates to the technical field of semi-coke blending combustion, in particular to a coal and semi-coke blending combustion method which comprises the following steps: S1, preparing a boiler and a coal mill; s2, determining a blending combustion proportion, controlling the proportion of the semi-coke powder with the particle size greater than or equal to R90 to be 17-25%, and controlling the proportion of the bituminous coal powder with the particle size greater than or equal to R90 to be within 15%; s3, controlling the temperature of a hearth outlet to be less than 987 DEG C, and controlling the temperature of the screen bottom to be 50-100 DEG C lower than the melting point temperature of the semi-coke ash; s4, the outlet temperature of the medium-speed mill is controlled to be 70-80 DEG C, and the inlet and outlet pressure difference of the coal mill is smaller than or equal to 4.8 KPa; the fineness R90 of the semi-coke powder is controlled within 17-25%, the burnout time of the pulverized coal is shortened, the semi-coke powder is fully burnt out, and the heat efficiency of the boiler is improved; the coke hanging amount of the platen superheater is reduced by controlling the temperature of a hearth outlet to be lower than 987 DEG C and the temperature of the platen bottom to be 50-100 DEG C lower than the melting point temperature of the semi-coke ash.

The invention discloses an outer frame protection method for preventing the edge of a part from collapsing in the polishing process. According to the method, the outer frame structure with the same shape as the non-machining face is glued to the non-machining face of the part, and edge collapse in the polishing process is prevented. The method comprises the specific steps that firstly, a part is machined on a grinding machine, and the edge collapse size is measured; an outer frame is designed according to the shape of the non-machined face of the part and the edge collapse size, it is ensured that the outer frame is matched with the part in size, and the outer frame is made of a material similar to the part in hardness; then, the hot melt adhesive ring is used for connecting the part with the outer frame, and it is ensured that the outer frame does not fall off in the machining process; then grinding the whole part and the outer frame to ensure that the thicknesses are consistent and measuring the flatness; and finally, heating to the melting point temperature of the hot melt adhesive, taking down the outer frame and the adhesive ring, cooling to room temperature, and removing the residue of the adhesive ring, thereby inhibiting the edge collapse phenomenon of the part. The method is simple in structure, convenient to operate and capable of effectively improving the machining quality of parts.

The utility model provides an electric valve and its assembling method, the electric valve includes valve parts, valve body parts and first transition piece, the metal material of first transition piece is different from the metal material of valve parts for welding position, the metal material of first transition piece is same with the metal material of valve body parts for welding position, the melting point temperature of at least one spare part inbuilt in valve parts is lower than brazing temperature, by first transition piece of metal material difference with valve parts for welding connecting seat or second transition piece is fixed through brazing, carries out valve parts assembly, then, first transition piece of metal material same with valve body parts is fixed through laser welding, like this, when the electric valve is applied to high pressure working medium system, through first transition piece respectively with valve parts and valve body parts welding fixed, improve the sealing performance between valve parts and valve body parts, also be favorable to reduce the risk of melting or deformation of the spare part in valve parts because of welding when the melting point is lower than brazing temperature.

The invention belongs to the technical field of soft magnetic materials, and particularly relates to a high-frequency low-loss iron-nickel soft magnetic powder core and a preparation method and application thereof. The preparation method comprises the steps that an iron-based amorphous material with the component system being Fe (100-x-y-z) Si < x > B < y > M < z > is subjected to gas atomization powder making, and the iron-based amorphous soft magnetic powder is obtained; then uniformly mixing the coating slurry with low-melting-point metal or alloy powder, a silane coupling agent and a thermosetting resin glue solution to obtain coating slurry; and uniformly mixing the iron-nickel soft magnetic powder with the coating slurry, carrying out vacuum hot-pressing curing molding, and then carrying out hot-pressing sintering treatment under the condition that the temperature is higher than the melting point temperature of low-melting-point metal or alloy powder and the oxygen-containing atmosphere, so as to obtain the high-frequency low-loss iron-nickel soft magnetic powder core. The high-frequency low-loss iron-based amorphous soft magnetic powder is adopted for composite modification, the ratio of the particle size of the iron-nickel soft magnetic powder to the particle size of the amorphous soft magnetic powder is optimized, the combination effect is improved, and therefore the high-frequency loss of the magnetic core is reduced.

The present application relates to the technical field of thermal interface materials, and relates to a composite thermal pad and a preparation method therefor, and a heat dissipation device. The composite thermal pad comprises: a graphene layer, oriented in a thickness direction, the graphene layer having a first surface and a second surface in the thickness direction, the first surface being used for being attached to a heat dissipation apparatus; and a liquid metal sheet layer, arranged on the second surface of the graphene layer, capable of bending towards side surfaces of the graphene layer, and covering at least part of the side surfaces of the graphene layer. The liquid metal sheet layer sequentially comprises a first alloy layer, an intermediate layer, and a second alloy layer from top to bottom; the materials of the first alloy layer and the second alloy layer are the same or different, the intermediate layer is made of a sheet-like thermally conductive material, and the sheet-like thermally conductive material comprises a solid metal foil or a third alloy; and the melting point temperature of the intermediate layer is higher than that of the first alloy layer and that of the second alloy layer. The composite thermal pad of the present application has high thermal conductivity and also has high compressibility and high repeatability.

The application relates to a composite heat-conducting gasket and a preparation method thereof and a heat sink, and belongs to the technical field of thermal interface materials. The composite heat-conducting gasket comprises a graphene layer oriented in a thickness direction, the graphene layer has a first surface and a second surface in the thickness direction, and the first surface is used for being attached to a heat dissipation device; a liquid metal sheet layer is arranged on the second surface of the graphene layer and can be bent to the side surface of the graphene layer and coat at least part of the side surface of the graphene layer; wherein the liquid metal sheet layer comprises a first alloy layer, an intermediate layer and a second alloy layer from top to bottom, the materials of the first alloy layer and the second alloy layer are the same, the intermediate layer is a sheet-shaped heat-conducting material, the sheet-shaped heat-conducting material comprises a solid metal foil or a third alloy, and the melting point temperature of the intermediate layer is higher than that of the first alloy layer and the second alloy layer. The composite heat-conducting gasket has high heat-conducting performance, high compressibility and high repeatability.

The application relates to a plate preparation method, comprising the following steps: arranging a plurality of convex strips on a substrate, the plurality of convex strips being parallel and spaced; wherein the material of the convex strips has a first boiling point temperature; manufacturing a glue layer to cover the plurality of convex strips, and the glue layer is filled in the gap between adjacent convex strips and is attached to the substrate; wherein the material of the glue layer has a second melting point temperature, and the second melting point temperature is higher than the first boiling point temperature; curing the glue layer by using a first temperature; wherein the first temperature is lower than the first boiling point temperature; vaporizing the plurality of convex strips by using a second temperature to form a plurality of parallel and spaced microchannels between the glue layer and the substrate; wherein the second temperature is higher than or equal to the first boiling point temperature and is lower than the second melting point temperature. The plate preparation method disclosed by the application has low energy consumption, low cost and environmental protection. The application also provides a plate obtained by the above preparation method.

A thermal interface material includes a matrix material; a first component including a plurality of metal droplets, the plurality of metal droplets having a melting point temperature of less than about 30 °C; and a second component having a solid phase including particles having an aspect ratio greater than about 2:1, at least a portion of the particles being dispersed in the matrix material, wherein the second component has a melting point temperature of between about 30 °C and about 90 °C at which the second component transitions from the solid phase to a liquid phase, wherein the second component in the liquid phase may be soluble in the matrix material.