118results about How to "Will not cause cracking" patented technology

The invention mainly relates to potting adhesive, in particular to a low-hardness and high-flexibility double-component condensed type organic silicon potting adhesive composition suitable for potting a light emitting diode (LED) display screen module. The composition comprises a component A and a component B, wherein the component A comprises a basic polymer, a filling material, a plasticizing agent and a deep curing agent; and the component B comprises a cross-linking agent, a tackifier and a catalyst. The component A and the component B are mixed according to designed proportion to have a cross-linking reaction so as to realize the effects of potting the LED display screen module, preventing adhesive layer cracking during repeatedly bending and folding LED tubes and providing excellent waterproof and dampproof properties.

The invention relates to a preparation method of a crack-free coating fiber, and belongs to the technical field of preparation of a composite material. After initial tensile stress sigma o is exerted to continuous single fibers or fiber bundles, an anti-oxidation coating is evenly deposited on the surface by using a CVD (chemical vapor deposition) method and the like under the condition of tensile stress; the initial tensile stress sigma o is unloaded under the condition that the initial tensile stress is greater than or equal to the crack generating temperature TC of the coating after deposition is ended; the anti-oxidation coating is integrally cooled to room temperature after the initial tensile stress sigma o is unloaded, so as to obtain the crack-free coating fiber. By adopting the preparation method, a thermal stress crack caused by mismatching of thermal expansion of the fiber and the coating is avoided; a channel of an oxidizing medium is cut off; the fiber is prevented from being oxidized; anti-oxidation protection of a full-temperature section is achieved. Thus, the integrality, the safety and the reliability of the composite material are improved; the preparation method is suitable for preparation of heat-resistant, anti-oxidation and high-temperature creep-resistant reinforced composites. Therefore, the preparation method is continuous and simple in preparation technology, and convenient to industrially produce.

The invention discloses conductive silver paste for low-temperature sintered LTCC. The conductive silver paste comprises 80.0-88.0wt% of silver powder, 0.2-5.0wt% of glass powder and 7.0-19.8wt% of organic carrier, wherein the silver powder comprises nanometer silver powder, microcrystal-shaped silver powder and sheet-shaped silver powder, the weight ratio of the nanometer silver powder and the microcrystal-shaped silver powder is (2.5-3.0):1, the weight ratio of the nanometer silver powder and the microcrystal-shaped silver powder and the sheet-shaped silver powder is (7.0-10):1, and the glass powder comprises Bi2O3, ZnO, SiO2, H3BO3, Al2O3, MgO, La2O3 and Nd2O3. The conductive paste does not contain lead and has excellent performance, the sintering temperature is 600-650 DEG C, the sintered LTCC product has excellent adhesion and favorable silver layer compactness, and the problem that Dupont paste and seld-made LTCC ceramic material sintering are not matched is solved.

The invention discloses compound buckled wood floors which comprise wood floor bodies and buckle pieces, wherein a first rabbet and a second rabbet are respectively arranged on two opposite sides of each wood floor body; after two adjacent wood floor bodies are connected with each other through the first rabbets and the second rabbets, the wood floor bodies can move in the length direction or the width direction; sliding chutes parallel to the edges of the wood floor bodies are respectively formed in two opposite sides on the back surfaces; the buckle pieces are mounted on the back surfaces of the wood floor bodies; parallel sliding rails are arranged on two sides of the buckle pieces and are matched with the sliding chutes; central boards parallel to the sliding rails are further arranged in the middles of the buckle pieces and are positioned between every two adjacent wood floor bodies. According to the compound buckled wood floors, by the adoption of a structure that the buckle pieces are matched with the wood floor bodies, the wood floor bodies cannot be damaged and can be assembled, disassembled and reused conveniently; two adjacent wood floor bodies are plugged through the rabbets and then are fixedly connected through the buckle pieces. The buckle pieces transmit fixed acting force of the wood floor bodies to the middle parts, so that cracking of the edge parts of the wood floor bodies can be effectively avoided.

The present invention provides one new kind of pre-coated sand including coke grains in the quantity of 2-6 % of sand weight. The present invention also provides the making process of the pre-coated sand, including a coke grain and sand coating step. The pre-coated sand may be used to make sand core for obtaining casting with compact and smooth surface.

The present invention relates to a multithread minor diameter long auger drilling wall forming machine. Said invention adopts portal shaped piledriver side-by-side set at least auger stems, lower end set drill, top connected with spacer, spacer slip connection with portal shaped piledriver, spacer set rotating power unit, auger stem connected with rotating power unit, auger stem being hollow in middle part, connected with concrete delivery pipe, guideway set below the chassis. Said invention solves uneven soil stirring, weak intensity, inefficiency etc shortage.

The invention discloses a T/P91 steel electrode manufacturing method. An R40 welding wire is used as a core wire. Medical powder comprises, by weight percentage, marble 31-35, fluorite 26-29, titanium dioxide 4-7, quartz 1-2, mica 1-2, chromium metal 13-15, atomization nickel powder 1-2, ferrotitanium 7-9, ferromolybdenum 1-2, ferroniobium 0.5-1, ferrovanadium 1-2, and vanadium-nitrogen alloy 1-2. After the powder is mixed in a drying mode, water glass is added according to a ratio of 3:1 and is mixed with the powder in a wet mode, and suppression is carried out after uniform stirring is carried out. Electrode coating weight coefficient is controlled to be 0.95-1.0, cracking of a coating after being dried is avoided, the compression environmental temperature is over 20 DEG C, the products are placed into a drying box after being dried for 3 hours, and is dried for 2 hours when temperature is 100 DEG C, 125 DEG C per hour is risen into 450 DEG C, and then furnace cooling of the products is carried out after being warmed for two hours. The steel electrode is good in welding process performance, little in splatter, low in smoke amount, and attractive in appearance of weld. All the performances can reach foreign imported similar steel electrode technological level. Production cost is greatly reduced.

The invention discloses an additive and method for improving the performance of permanent magnetic ferrite. The additive is composed of calcium carbonate, quartz sand, and silicon carbide. The method comprises the following steps: (1) adding a permanent magnetic ferrite pre-sintered material into a ball mill, at the same time, adding the additive, then adding water, and carrying out ball-milling to obtain permanent magnetic ferrite slurry; (2) filtering the permanent magnetic ferrite slurry to obtain permanent magnetic ferrite filtered slurry; (3) filling the permanent magnetic ferrite filtered slurry into a mould, and pressing the permanent magnetic ferrite filtered slurry under a pressure of 350 to 500 kg/cm2 and a magnetic field strength of 450 to 950 kA/m so as to obtain a permanent magnetic ferrite blank; (4) sintering the obtained permanent magnetic ferrite blank for 0.5 to 3.0 hours at a temperature of 1150 to 1250 DEG C to obtain permanent magnetic ferrite. The additive cost is low, the raw material resources are wide, pricy additives such as rare earth elements, cobalt oxide, and the like are not needed; compared with the prior art, the magnetic performance of the obtained permanent magnetic ferrite is more excellent, and the performance to cost ratio is higher.

The invention relates to a vacuum light-condensing through high-temperature heat collecting pipe which comprises an outer pipe, an inner pipe and a light-condensing reflector. The vacuum light-condensing through high-temperature heat collecting pipe is characterized in that the outer pipe is a glass pipe, the coaxially-arranged inner pipe is a heat-absorbing heat conducting pipe, a metal end cap capable of axially deforming is arranged at one end of the outer pipe, a sealing head containing a valve-enabling metal pipe is arranged at the other end of the outer pipe, the metal end cap and the sealing head are hermetically connected with the end portion of the outer pipe to form a vacuum sealed cavity, two ends of the heat-absorbing heat conducting pipe extend out of the vacuum sealed cavity, the light-condensing reflector is positioned in the vacuum sealed cavity, and a focal point of the light-condensing reflector is positioned on the central axis of the heat-absorbing heat conducting pipe.

The invention belongs to the field of binder preparation, and relates to a preparation method of a nano-ceramic binder. The preparation method comprises the following steps: a) taking the raw materials by mass percentage: 30-50% of talcum, 10-20% of kaolin, 15-20% of boron glass, 8-10% of fluorite, and 20-25% of quartz powder, grinding the raw materials and sieving the raw materials through a sieve being 200-300 in meshes to prepare a mixture material; b) pressing and smelting the mixture material, and performing water-quenching on the mixture material; c) drying the product in the step b), adding nano vanadium nitride/chromium nitride modifier, grinding the product and sieving the product to obtain a basic ceramic binder; and d) pressing the basic ceramic binder in the step c) to form abonder blank by a press, and sintering the bonder blank in a microwave sintering oven to prepare the ceramic bonder. The method is low in reaction time and short in reaction time, is low in productioncost, saves energy, and is easy to carry out industrially.

The invention relates to a drill-buried type prefabricated pipe pile for an electric transmission line. The drill-buried type prefabricated pipe pile comprises an internal flow-guiding component, a flow-guiding steel pipe, a prefabricated miniature pipe pile, a grouting head, a grouting head top plate, a grouting hole, a grouting steel pipe, a grouting head bottom plate, reinforcing ribs, an open hole, a top plate, a pore, bolt holes, an external positioning nesting component, four fork feet, angle steel and mortar, the internal flow-guiding component and the external positioning nesting component are connected through the grouted mortar, the internal flow-guiding component comprises the flow-guiding steel pipe, the prefabricated miniature pipe pile and the grouting head, the reinforcing ribs are welded into the grouting steel pipe, the open hole is formed in the grouting steel pipe, the top plate is welded to the top of the flow-guiding steel pipe and provided with the pore, the bolt holes are formed in the four corners of the top plate, and the four fork feet are welded to the outer wall of the external positioning nesting component through the angle steel at equal distances. The drill-buried type prefabricated pipe pile has the advantages of small environmental influence, high construction efficiency, reliable quality and low cost, and is suitable for being used and promoted.

The invention discloses a clearance control method for adhesion of a tube target. The method comprises a back tube and a tube target material; the back tube is prepared from titanium or stainless steel; the tube target material is prepared from metal or ceramic; the outer side of the tube target material is provided with a regulating ring; the tube target material and the back tube are coated withthe regulating ring; the regulating ring comprises an inner ring body, an outer ring body and sealing flanges, wherein the sealing flanges are arranged at the two end faces; the sealing flange at oneend is provided with a regulating component which is used for regulating the same-diameter distance from the inner ring body to the outer ring body; the inner side surface of the inner ring body adheres to the tube target material; and in a using process, the regulating component is used for regulating the inner ring body to adhere to the tube target material, is locked and is then heated. The method disclosed by the invention is used for effectively controlling a clearance between the back tube and the tube target material.

The invention relates to an antique imitation treatment method of date wood. The antique imitation treatment method comprises the following steps: (1) peeling fresh date wood, washing mucus away from the surface, then coating the surface of the date wood with sodium bicarbonate, and then carrying out air drying for 10-15 days; (2) washing impurities away from the surface of the date wood, soaking in a treatment liquid at 35 DEG C for 12 hours, flushing clean with clear water, and then keeping the temperature at 58 DEG C under the relative humidity of 42% for 6 hours; and (3) soaking the date wood (treated in step (2)) in a urea aqueous solution with the gravity concentration of 2.5% at 22-30 DEG C for 30 hours, fishing out, cleaning with clear water, keeping the temperature at 46 DEG C under the relative humidity of 32% for 3 hours, and then keeping the temperature at 38 DEG C under the relative humidity of 20% for 10 hours. The treatment method is even and good in effect.

The present invention relates to the field of adhesive tapes, and concretely relates to a cutting adhesive tape for processing semiconductor materials, and a preparation method thereof. The adhesive tape for processing semiconductor materials comprises a substrate layer and an adhesive layer, and raw materials for preparing the adhesive layer comprise 80-100 parts of an olefinic acid substance, 0.1-10 parts of a crosslinking agent, 0.05-0.1 part of an initiator, 30-50 parts of polyisocyanate, 80-120 parts of a solvent and 5-15 parts of expanded microspheres.

The invention discloses a negative plate with an insulating sealed edge, which comprises a negative plate body and a conductive beam, wherein the conductive beam is connected with one end of the negative plate body; a hanger is arranged on the conductive beam; the negative plate further comprises an insulating sealed edge band; the insulating sealed edge band is integrally cast with one side edge of the negative plate body. According to the invention, an insulating material is directly formed and tightly bonded to the edge of the negative plate via plastifying, extruding and cooling through an injection molding machine, so as to become the insulating sealed edge band of the negative plate, so that mechanical striking installation is not needed, the mounting procedure is eliminated, and the mounting cost is reduced; the insulating material is tightly bonded with the negative plate without a gap, so that an acid liquor can not enter the edge of the negative plate to prevent the acid liquor from corroding the negative plate; the negative plate with the insulating sealed edge is acid-resisting, corrosion-resisting, simple in structure and excellent in sealing effect.

The invention discloses a four-axis piezoelectric ceramic excitation device for testing the dynamic characteristics of an MEMS microstructure. The device comprises a sleeve, a bottom plate, a piezoelectric ceramic, a pressure sensor, an upper connecting block, a lower connecting block, a steel ball, an elastic supporting part and an MEMS microstructure. An annular top plate is arranged at the upper end of the sleeve. The microstructure is arranged on the annular top plate through the elastic supporting piece. Guide shafts are uniformly distributed between the annular top plate and the bottom plate. The lower connecting block is provided with guide supporting arms. The guide supporting arms penetrate through the wall of the sleeve to be sleeved on the guide shafts. Locking devices are arranged on the guide supporting arms respectively. Spherical grooves are formed in the upper connecting block and the lower connecting block respectively. The piezoelectric ceramic is clamped between thepressure sensor and the elastic supporting part. The outer edge of the upper connecting block is jacked into the inner wall of the sleeve through a ball head plunger. According to the device, pre-tightening forces of different sizes can be applied to the piezoelectric ceramic, and the obtained measurement values of pre-tightening forces are more accurate. As a result, the adjustment process for compensating the parallelism error between two working surfaces of the piezoelectric ceramic becomes more smooth and smoother. As a result, dynamic characteristic parameters can be conveniently tested.

An inverse piezoelectric effect-based MEMS microstructure four-shaft type off-chip vibration excitation device disclosed by the present invention comprises a sleeve, the stacked piezoelectric ceramics, a pressure sensor, the upper and lower connecting blocks and an MEMS microstructure, and is characterized in that a supporting plate and an electric lead screw transmission mechanism connected withthe lower connecting block are arranged in the sleeve, the lower end of the upper connecting block is equipped with a hemispherical round head and presses on the lower connecting block, and the piezoelectric ceramics are clamped between the pressure sensor and an elastic supporting member; the ball head plungers are uniformly distributed on the circumference between the upper connecting block andthe sleeve, the steel balls at the inner ends of the ball head plungers push into a chute at the outer edge of the upper connecting block, and the guiding shafts penetrating the lower connecting blockare uniformly distributed in the sleeve. The device can apply different pre-tightening forces on the stacked piezoelectric ceramics flexibly, so that the pre-tightening force measurement values are more accurate, an adjustment process for compensating a parallelism error of the two working surfaces of the stacked piezoelectric ceramics becomes more smooth, the shear forces between the stacked piezoelectric ceramics are reduced, and the dynamitic characteristic parameters of the MEMS microstructure are convenient to test.

The invention discloses a protecting method of an electrode guide rod for insulating corrosion of an electrolyte atmosphere, and relates to a protecting method of an electrolyte guide rod of a noble electrode aluminum electrolysis cell. The protecting method is characterized in that a seal filling material is made by using aluminum oxide powder, quartz powder, sodium carbonate powder, electrolyte powder and glass powder as raw materials, wraps around the electrode guide rod, and forms a protecting layer which is of a thick melted glass body and is used for sealing a gap and insulating the electrolyte atmosphere and absorbing a swelling stress when normal electrolysis runs. By adopting the protecting method, the electrode guide rod is protected, so that the corrosion of the electrolyte atmosphere can be effectively insulated.

The invention discloses a four-axis excitation device capable of dynamically driving an MEMS microstructure. The excitation device comprises a sleeve, a bottom plate, a piezoelectric ceramic, a pressure sensor, an upper connecting block, a lower connecting block, a steel ball, an elastic supporting part and the MEMS microstructure; an annular top plate is arranged at the upper end of the sleeve, the microstructure is arranged on the annular top plate through the elastic supporting part; guide shafts are uniformly distributed between the top plate and the bottom plate, the lower connecting block is uniformly provided with guide support arms which penetrate through the sleeve wall and sleeve the guide shafts; the upper connecting block and the lower connecting block are respectively providedwith a conical groove and a spherical groove which are matched with each other, tension springs are uniformly distributed between the upper connecting block and the lower connecting block to make thesteel ball be clamped between the conical groove and the spherical groove; and the piezoelectric ceramic is clamped between the pressure sensor and the elastic supporting part. According to the device, pre-tightening force of different sizes can be applied to the piezoelectric ceramics, meanwhile, the obtained pre-tightening force measurement value is more accurate, so that the adjustment processof the parallelism error of the two working surfaces of the compensation piezoelectric ceramic can be smoother, and dynamic characteristic parameters can be tested conveniently.