7results about How to "Large expansion coefficient" patented technology

The present invention relates to an intermetallic dielectric layer, a manufacturing method thereof and a semiconductor device. The manufacturing method of the intermetallic dielectric layer comprises: obtaining a base structure formed with a metal structure, the surface of the metal structure being covered by an SRO layer; forming a silicon nitride layer with compressive stress on the surface of the SRO layer on the side wall of the metal structure; filling fluorine-containing silicon glass so that it covers the metal structure, the SRO layer and the silicon nitride layer as an intermetallic dielectric layer. The present invention sets a silicon nitride layer between the SRO layer and the fluorine-containing silicon glass. Since the silicon nitride layer has compressive stress, it can suppress the microscopic deformation of the metal structure caused by the thermal process (the expansion coefficient of the metal structure is larger than the expansion coefficient of the fluorine-containing silicon glass, so the microscopic deformation of the metal structure is large during the temperature change process). Furthermore, since the strength of silicon nitride is relatively large, the newly added silicon nitride layer can prevent the metal structure from being deformed and causing the SRO layer to break, and prevent the subsequent free fluorine ions in the fluorine-containing silicon glass from entering and corroding the metal structure to cause voids.

The utility model relates to the technical field of melt-blown non-woven fabric production, in particular to a melt-blown non-woven fabric electrostatic electret device capable of cleaning dust in a sealed mode, which comprises a sealed processing box, a dust collection assembly and electrostatic elastic needles, and movable rollers are arranged in the middle of the inner side of the sealed processing box in a staggered mode. A melt-blown non-woven fabric body is attached to the outer walls of the multiple sets of movable rollers, a driving roller is arranged at one end of the interior of the sealing treatment box, a transmission motor is connected to the outer wall of the driving roller through a shaft, the dust collection assembly comprises a slotting arc plate, a rotating plate, a rotating rod and a dust collection filter screen, and the dust collection filter screen is embedded into the inner side of the slotting arc plate. A rotating plate is arranged at the joint of the slotting arc plate and the interior of the sealing treatment box; the electrostatic electret treatment device solves the problems that dust generated in the working procedure cannot be treated when electrostatic electret treatment is carried out on non-woven fabrics in the prior art, and the production quality of the non-woven fabrics is affected due to poor electrostatic electret effect caused by insufficient expansion coefficient of the non-woven fabrics.

The invention relates to the technical field of pyrophyllite high-grade white porcelain, in particular to a method for preparing pyrophyllite high-grade white porcelain, wherein the raw materials for preparing the white porcelain include blank and glaze: the blank formula is composed of the following by weight: 10-20 parts of black mud, 15-20 parts of Datong soil, 8-10 parts of feldspar, 20-30 parts of pyrophyllite, 8-10 parts of quartz, 10-15 parts of elution mud, 15-25 parts of Longyan soil, 1-4 parts of bone meal and 1-3 parts of talc. The invention uses pyrophyllite as a base material to produce high-grade white porcelain, the pyrophyllite has less structural water, relatively stable water content and permanent linear expansion, so the white porcelain has small deformation and good thermal stability, high crystalline quartz content and large expansion coefficient, and the pyrophyllite blank adjusts the bonding performance between the blank and glaze through the opposite way, so that the blank and glaze have good adaptability, the pyrophyllite contains less structural water, the dehydration process is slow, the shrinkage during the firing process is small, which is conducive to the rapid firing of the kiln, improves the product quality of the ceramics and saves energy and reduces consumption.

The invention provides a broadband high-frequency flutter differential pressure wave excitation device, belongs to the technical field of hydraulic control, and realizes multi-frequency low-distortion periodic flutter excitation pressure waves in a broadband range (1-2000 / 10000 Hz) in a hydraulic system. The device comprises two pressure excitation chambers and an electromagnetic excitation actuator, so that hydraulic excitation waves in a differential form are provided for the two chambers of a hydraulic cylinder respectively. Wherein the pressure excitation chamber is of a piston structure, can realize relative amplification of high-frequency micro-displacement, and is driven by an electric excitation actuator. The electric excitation actuator selects a Terfenol-D magnetostrictive material as a driving source. The device is simple in overall structure and convenient to use, has the capacity of linearly adjusting the output hydraulic flow and has the overall high anti-pollution capacity, most of designed key performance parts are standard parts, and the manufacturing difficulty is greatly reduced.

The present invention discloses a tool for welding high-precision thin-walled annular parts and a welding method thereof, and belongs to the technical field of welding process of high-precision thin-walled annular parts of turbines; the tool comprises an outer lining of a cylindrical structure, the middle part of the outer lining is a hollow structure, and an inner lining is also arranged inside the central control; the outer lining is made of copper, and the inner lining is made of stainless steel, the outer side surface of the inner lining matches the inner side surface of the outer lining, and is fixedly assembled; the outer lining is also provided with a plurality of cooling channels and heating channels; the present invention adopts the principle of thermal expansion and contraction to realize the assembly of high-precision thin-walled annular parts, provides better supporting force during the welding process, achieves high-precision dimensional control requirements by accurately controlling the thermal expansion of the temperature, and installs a stainless steel rigid lining with a larger linear expansion coefficient inside the device to increase the service life of the device.

The utility model provides a high-conductivity anode structure which comprises a carbon block and an anode steel claw, the anode steel claw comprises a claw part, a carbon bowl is arranged on the carbon block, the claw part is inserted into the carbon bowl, a high-performance conductive film is embedded in the carbon bowl, and the high-performance conductive film is attached to the side wall of the carbon bowl. And a phosphorus pig iron casting body is cast between the high-performance conductive film and the claw part inserted in the carbon bowl. When the high-conductivity anode structure is assembled, the high-performance conductive film is embedded into the carbon bowl and is attached to the side wall of the carbon bowl, then the claw part of the anode steel claw is inserted into the carbon bowl, and molten phosphorus pig iron is cast between the high-performance conductive film and the claw part inserted into the carbon bowl; the high temperature of the molten phosphorus pig iron softens the high-performance conductive film, and when the molten phosphorus pig iron is cooled and solidified, the softened high-performance conductive film can be better in close contact with the solidified phosphorus pig iron casting body and the side wall of the carbon bowl, so that the iron-carbon pressure drop and the ineffective energy consumption of the high-conductivity anode structure in use are reduced.

This invention provides a flame retardant for water-based fire-retardant coatings for steel structures, prepared from the following raw materials: urea, phosphoric acid, acidic lignin, and pentaerythritol; the weight ratio of urea, phosphoric acid, acidic lignin, and pentaerythritol is 1:(0.8-1):(0.1-0.5):(0.01-0.05). Applying this flame retardant to water-based fire-retardant coatings for steel structures achieves both moisture resistance and flame retardancy.