10results about How to "Avoid stress cracking" patented technology

This invention discloses a low-corrosion chloride molten salt heat transfer and storage medium, method, and application, belonging to the field of molten salt thermal storage technology. The high-heat-capacity, low-corrosion carbonate molten salt heat transfer and storage medium of this invention is composed of 18%~22% potassium chloride, 6%~10% sodium chloride, 1%~3% aluminum powder, 1%~3% magnesium powder, 1%~3% zinc powder, with the remainder being zinc chloride. Its key feature is the introduction of metal powder into the molten salt, which not only achieves excellent thermal storage performance at 600℃~800℃, but also reduces corrosion by utilizing the potential regulation ability of dissolved metal ions and the formation of highly active [Al] from gaseous chloride products through physical and chemical adsorption. This low-corrosion chloride molten salt heat transfer and storage medium achieves excellent thermal storage performance and low corrosivity, and can be applied in solar thermal power generation and molten salt energy storage.

This invention discloses a high thermal conductivity semiconductor packaging substrate and its preparation method, relating to the field of electronic materials technology. The method includes the following steps: mixing composite aluminum nitride powder with a sintering aid, ball milling, drying, and pressing into shape; sintering under high temperature and high pressure in a nitrogen atmosphere to obtain an aluminum nitride ceramic substrate; washing and drying the aluminum nitride ceramic substrate; covering both sides of the aluminum nitride ceramic substrate with copper foil, laying active solder between the aluminum nitride ceramic substrate and the copper foil, and then connecting them by vacuum brazing to obtain the semiconductor packaging substrate; the composite aluminum nitride powder is composed of aluminum nitride powder and modified aluminum nitride powder in a mass ratio of (6~8):(2~4). The semiconductor packaging substrate prepared by this method has excellent interfacial compatibility, effectively reduces interfacial thermal stress, and has good thermal conductivity.

This application relates to the field of crystal growth technology and discloses an integrated seed wafer assembly and its fabrication method. The fabrication method of the integrated seed wafer assembly includes: forming a carbon film on the silicon surface of a seed wafer to obtain a seed wafer containing the carbon film; forming a first adhesive layer on the surface of the carbon film away from the seed wafer; forming a second adhesive layer on any surface of a graphite plate; and bonding graphite paper between the first adhesive layer and the second adhesive layer to obtain an integrated seed wafer intermediate; subjecting the integrated seed wafer intermediate to gradient hot pressing to obtain an integrated seed wafer; wherein the gradient hot pressing includes at least two hot pressing operations with increasing temperature gradients. The integrated seed wafer assembly obtained by this method exhibits high bonding strength between the seed wafer and the graphite component. Furthermore, using this integrated seed wafer assembly during crystal growth helps improve the quality of the wafer.

The utility model relates to the technical field of battery anode and cathode material production and preparation devices, in particular to a spliced graphite sagger which comprises a frame body and a bottom plate which can be mutually connected to form a cavity, the frame body comprises a plurality of column feet and a plurality of side plates, and the adjacent column feet are connected through the side plates. The spliced graphite sagger is simple in structure, few in core parts and consistent in specification, if the same graphite sagger adopts column feet of the same specification and side plates of the same specification, the production efficiency of the spliced graphite sagger can be greatly improved, meanwhile, splicing is easy, firmness is high, the parts can be directly replaced under the condition that the parts are damaged, and the production cost is reduced. And the maintenance cost can be effectively reduced.

The application relates to the technical field of new energy automobile production equipment, in particular to a hot forming stamping equipment and a stamping method for new energy automobile stamping parts production, which comprises a base, a sliding groove is arranged at the top end of the base, a lower die assembly is arranged at the sliding groove, the lower die assembly comprises a sliding seat, a lower die is arranged on the sliding seat, the sliding seat is a cavity structure and an adsorption hole is arranged at the top of the sliding seat, an upper die assembly is fixedly installed at one side of the top end of the base, and an upper die cooperating with the lower die is arranged on the upper die assembly. In the actual use process, the heating time of the stamping part can be selectively controlled, the heating speed is fast, the stamping efficiency can be effectively improved, the transfer time is short, stress fracture is avoided, the product quality is ensured, the oxide skin and impurities on the surface of the stamping part are effectively removed in the stamping process, the product quality is ensured, and the oxide skin and impurities are prevented from damaging the inside of the stamping die.

The utility model provides a concealed installation electric box structure for a building block type residential building, which comprises an electric box assembly arranged between building blocks, the top of the electric box assembly is detachably connected with a section bar beam plate, the length of the section bar beam plate is larger than that of the electric box assembly, the bottom surface of the building block arranged above the section bar beam plate is provided with a notch, and the section bar beam plate is detachably connected with the notch. The section bar reinforcing ribs of the section bar beam plate are connected with the notches in an inserted mode, and a hole used for a wire pipe to penetrate is formed between the electric box assembly and the section bar beam plate in a communicating mode. The section bar beam plates and the building blocks are connected in an inserted mode through the notches, mechanical occlusion is formed, loads of an electric box area are dispersed, local compression cracking of the masonry is avoided, the shock resistance and durability of the whole structure are improved, and the structural stability is enhanced. Construction is convenient, brick arrangement of the wall is not affected, integrality is high, the problem that a concrete lintel is inconvenient to carry and install and prone to breakage is solved, aluminum alloy section beam plates are adopted, construction is convenient, breakage is not prone to occurring, transportation is convenient, and brick arrangement of wall building is not affected.

The invention relates to the technical field of metallurgical engineering, in particular to a production method and device for a hot-crack-resistant steel roller. The method comprises the steps that in the process of pouring outer-layer molten metal into a mold, the rotating speed set value of a main shaft is adjusted at a first adjusting frequency based on multivariate perception data till pouring of the outer-layer molten metal is finished; after pouring of the outer-layer molten metal is finished, whether the second pouring condition is met or not is determined at the second adjusting frequency based on the multivariate perception data; in the process of pouring the inner-layer molten metal, the pouring speed set value is adjusted based on the multivariate perception data at a third adjusting frequency until pouring of the inner-layer molten metal is finished; and after pouring of the inner-layer molten metal is finished, whether the rotation stopping condition of the centrifugal machine is met or not is determined at the fourth adjusting frequency based on the multivariate sensing data. Therefore, according to the method, corresponding parameter regulation and control strategies can be set for different process stages such as outer-layer pouring, inner-layer pouring and rotation stopping, and the forming quality and production stability of the hot-crack-resistant steel roller are remarkably improved.

This application discloses a vanadium boron oxide glass-ceramic cathode material and its preparation method, cathode sheet, secondary battery, and power device. The vanadium boron oxide glass-ceramic cathode material includes amorphous Na3V2B2O. 10 The matrix and VO2 nanodomains, the VO2 nanodomains being dispersed in amorphous Na3V2B2O 10 The matrix, VO2 nanodomains, through the formation of amorphous Na3V2B2O 10 The substrate undergoes initial charge-discharge induction to form VO2 nanodomains with a particle size of 2nm~5nm. The vanadium boron oxide glass-ceramic cathode material of this application can be used to fabricate batteries, achieving a balance between high voltage and high stability through localized crystallization induced during the charge-discharge process.

The utility model discloses an electrode leading-out structure of a ceramic flat membrane type pressure sensor, which comprises a lead, a through hole, a ceramic base, an elastic membrane and an elastic membrane electrode, the ceramic base is provided with a metalized through hole, and the inner wall of the through hole is coated with palladium-silver paste to form a palladium-silver conductor; printing and curing medium-temperature silver paste on the bonding surface of the elastic membrane electrode and the metalized through hole for conducting the elastic membrane electrode to the metalized through hole; and coating soldering paste on the bonding pad connected with the through hole of the base, inserting and fixing the lead into the soldering paste of the bonding pad, welding the lead by using a reflow soldering furnace, and leading out the electrode of the elastic membrane. According to the utility model, a low-resistance path is realized through metallization of the through holes, and the flexible buffer of the silver paste is combined, so that the problem of stress cracking caused by mismatching of thermal expansion coefficients is solved, the problem of low reliability of traditional point elargol welding is solved, and the long-term stability and the anti-fatigue performance of the sensor are improved.

The utility model relates to the field of coated glass production, and disclose a coated glass air knife cooling equipment, including frame board, one side of frame board is provided with fixed column, one end of fixed column is provided with motor, and the output of motor is provided with the pivot. This coated glass air knife cooling equipment can make the equipment have the effect that the cooling effect is good, the upper air knife and the lower air knife utilize compressed air to form high speed airflow through the slit nozzle, the water film on the glass surface is separated and atomized like a blade, the drying time is greatly shortened, the production line speed is improved, in view of the poor cooling effect of the prior art coated glass production, the equipment effectively solves the bottleneck that the glass surface is coated and relies on natural evaporation or inefficient mechanical wiping drying, reduces the waiting time of subsequent processes, effectively prevents the stress cracks of thick glass due to the different shrinkage rates of the edge and the center during rapid cooling, and improves the product quality.