35results about How to "Strict process" patented technology

The invention relates to an aluminum-copper-iron quasi-crystal and silicon carbide mixed enhanced aluminum-based composite preparation method. In order to overcome the defects of low tensile strength and low hardness of aluminum-based materials, aluminum alloy serves as a matrix and aluminum-copper-iron quasi-crystal and silicon carbide serve as reinforcing agents to prepare an aluminum-copper-iron quasi-crystal and silicon carbide mixed enhanced aluminum-based composite by means of smelting in a medium-frequency induction melting furnace, argon bottom blowing protection, casting and vacuum heat treatment. The preparation method is technically advanced, precise in procedure and accurate and detailed in data, the aluminum-copper-iron quasi-crystal and silicon carbide mixed enhanced aluminum-based composite prepared according to the method is 80.3HB in hardness which is improved by 50.64%, 285Mpa in tensile strength which is improved by 60.42%, and corrosion resistance is improved by 40%, and the aluminum-copper-iron quasi-crystal and silicon carbide mixed enhanced aluminum-based composite preparation method is pretty optimal.

The invention relates to a preparation method of a quasi-crystal reinforced type aluminum-based composite material. Aiming at a condition that the aluminum-base material has low hardness, low tensile strength and bad corrosion resistance, the preparation method comprises the following steps: smelting in a vacuum smelting furnace, performing argon gas bottom-blowing protection, casting and extruding by using the aluminum alloy as a matrix and taking aluminum copper iron quasi-crystal as an enhancer. The preparation method is advanced in process, strict in procedure and precise and accurate in data. The prepared quasi-crystal enhanced aluminum matrix composite material has hardness up to 82.6 HB which is increased by 61.33%, tensile strength up to 283Mpa which is increased by 74.75%, and corrosion resistance is increased by 30%. The preparation method is an ideal preparation method of the quasi-crystal reinforced type aluminum-based composite material.

The invention relates to a preparation method of a quasi crystal enhanced type magnesium-based composite material and directs at the conditions that a magnesium-based material is low in hardness and tensile strength. A magnesium alloy serves as a base body, magnesium-zinc-yttrium quasi crystals serve as an enhancing agent, and the quasi crystal enhanced type magnesium-based composite material is prepared through smelting in a vacuum smelting furnace, semi-solid casting and extrusion forming. The preparation method is advanced in process and strict in procedure, data are accurate and detailed,the hardness of the prepared quasi crystal enhanced type magnesium-based composite material reaches 88.9 HV, the tensile strength reaches 235 MPa, the elongation percentage is 10.5%, and the preparation method is an advanced preparation method of the quasi crystal enhanced type magnesium-based composite material.

The invention relates to the technical field of dehumidification of PVC production materials and more particularly relates to a cleaning device for dehumidification of a PVC double-wall corrugated pipe production material and a dehumidification system and method. The cleaning device is connected to an exhaust port and a branch pipe of an extruder, and comprises: a box body and an input tube and anoutput tube at the top of the box body. The input tube is connected to the exhaust port of the extruder. The input tube is connected to the branch pipe. The cleaning device also comprises a cleaningport at the bottom of the box body, a cleaning port baffle located at the cleaning port and used for controlling opening and closing of the cleaning port, and a partition plate located in the box body, extending downwardly from the top in the box body and arranged between the input tube and the output tube.

The invention relates to a die-casting preparation method of a graphene-reinforced magnesium-based composite material. Aiming at the uneven dispersion of graphene in the magnesium alloy matrix and the difficulty in combining with the matrix, a semi-solid die-casting method is adopted. After melting, heat preservation, and electromagnetic Stirring, compacting, and die-casting to make graphene-reinforced magnesium-based composite materials. The graphene-reinforced magnesium-based composite material has a hardness of 82.5HB, a tensile strength of 235Mpa, and an elongation of 7.3%. It is an advanced preparation method of graphene-reinforced magnesium-based composite materials.

The invention discloses a data preparation and management method based on a task mechanism. The original card making data and key data are combined, and the dispersion factor is involved in the key data preparation process, which avoids the single key data being directly used as an IC card or The potential safety hazard of the chip key has high practicability; by specifying the key, using different and multiple distribution factors, the key is distributed and calculated layer by layer, and several pieces of dispersed key data and key data are obtained. The preparation process is interlocking and rigorous, with high security; the introduction of the task mechanism, the establishment of the card production task, the determination of the task start time, the system can start or suspend the card production task, the background service according to the card production Tasks perform corresponding operations to meet the different needs of different application systems for key data preparation, and have wide adaptability. Improve the security of the key data preparation process and meet the user's large-scale and centralized issuance operation requirements for IC cards or chips.

The invention relates to a semi-solid squeezing casting method and system for aluminum alloy and belongs to the technical field of preparation and application of nonferrous materials. The method comprises the following steps that firstly, an aluminum alloy block is cut into aluminum alloy pieces, the aluminum alloy pieces are wrapped with aluminum foil correspondingly, and then the wrapped aluminum alloy pieces are preheated; the preheated aluminum alloy pieces are smelted, so that molten aluminum alloy is obtained; the molten aluminum alloy is poured into a heat preservation device for heat preservation via a sprue with a bent channel or an inverted conical channel, and semi-solid aluminum alloy slurry is obtained; the semi-solid aluminum alloy slurry is poured into a heat preservation squeezing mold to be subjected to squeezing molding treatment; and finally, pressure application continues after the squeezing molding treatment is completed, then a casting is jacked out and subjected to air cooling, and an semi-solid aluminum alloy squeezed casting is obtained. According to the preparation method, the advanced process is achieved, procedures are precise, data are accurate and full, and after heat treatment of the prepared semi-solid aluminum alloy squeezed casting, the hardness of the casting can be up to 82.9 HB and the tensile strength of the casting can be up to 279 Mpa.

The invention relates to a preparation method of an aluminum, copper and iron quasicrystal. In order to solve the problem that process defects exist as the preparation method of the aluminum, copper and iron quasicrystal is difficult, the preparation method comprises the following steps: smelting and casting, quickly cooling, thermally treating and annealing and quenching to prepare an aluminum, copper and iron quasicrystal block material by adopting a medium-frequency induction smelting furnace casting method. The preparation method of the aluminum, copper and iron quasicrystal disclosed by the invention is advanced in process, accurate and full in data; the I phase of the quasicrystal is Al61.92Cu26.21Fe11.87, the product purity is high, the I phase content of the quasicrystal is 98%, the mechanical performances are stable, the hardness is 796HV, and therefore, the preparation method can be applied to various industrial fields and is a very ideal preparation method of the aluminum, copper and iron quasicrystal.

The invention relates to a method for preparing a multi-component synergistically strengthened aluminum-based composite material. Aiming at the poor mechanical properties of cast aluminum-lithium alloys, different alloy elements and endogenous titanium carbide phases are added to the aluminum-lithium alloys, and the aluminum-lithium alloys are smelted. , argon bottom blowing, electromagnetic stirring, extrusion casting and heat treatment to make a multi-component synergistically strengthened aluminum matrix composite; Up to 485MPa, hardness up to 189Hv, is an advanced multi-component synergistically strengthened aluminum matrix composite material preparation method.

The invention discloses a CNTs-reinforced magnesium-based composite material and a preparation method thereof. The CNTs are pre-dispersed by a chemical pretreatment method, and the CNTs-reinforced magnesium-based composite material is prepared by a stirring casting method. The results show that the chemical pretreatment composite stirring The casting method has a positive effect on the uniform dispersion of CNTs; the present invention aims at the poor wettability of CNTs on the metal interface, and the phenomenon that agglomeration easily occurs in the metal melt, and the magnesium alloy is used as the matrix and the CNTs are used as reinforcements. The CNTs / Mg-6Zn composite material is made after semi-solid stirring smelting, ultrasonic-assisted stirring, casting, solid solution and aging treatment under the action of the atmosphere. This preparation method has advanced technology and strict procedures. The prepared CNTs / Mg6ZnCNTs / Mg ‑6Zn composite material, after adding CNTs, the structure of CNTs / Mg‑6Zn composite material is more refined, and the grain size is obviously finer, which realizes fine grain strengthening; near the grain boundary of CNTs / Mg‑6Zn composite material, it can be found that With multiple second phases, CNTs hinder the movement of dislocations, resulting in the accumulation of dislocations, which plays a role in strengthening the second phase.

The invention discloses a key dispersion method for enhancing the security of a symmetric key system, and relates to the technical field of information security encryption, comprising the following steps: step (1), respectively injecting a secondary dispersion factor into a primary key management system; In step (2), the first-level key management system uses the national standard algorithm to perform distributed operations on the second-level dispersion factor with the designated key, and obtains the key data of the second-level key management system. The beneficial effect of the present invention is that: adopting the present invention, different dispersive factors can be distributed and calculated by specifying a key to obtain several pieces of different key data. This method avoids the single derivation and transformation method in which the random number is directly used as a key, provides multiple key derivation transformation methods, and enhances the security of the key derivation transformation process.

The present invention provides a WEB authentication method based on OAuth2.0 cryptographic service middleware. First, the cryptographic service middleware applies to the authentication server for authorization authentication; the cryptographic service middleware performs DES on the user information and the smart cryptographic key PIN code submitted by the browser. Encrypted, and then sent to the authentication server; after receiving the request, the authentication server verifies the password service middleware information; the authentication server verifies the decrypted user information and PIN code, and after passing through, the server performs Subject login, encrypts the authorization certificate and returns it to the middleware ; After the middleware receives the authorization certificate, the middleware Subject logs in, and then requests to the authorization server; the authorization server verifies the decrypted authorization certificate, and issues an access token to the password service middleware after passing the verification. The invention combines the user password with the intelligent password key to further solve the problem of weak verification security of the single password of the OAuth2.0 protocol, the process is more rigorous, and the security guarantee of the authorization authentication process is strengthened.

The invention relates to a method for preparing a graphene-reinforced aluminum-based composite material by injection molding. Aiming at the situation that graphene is not uniformly dispersed in an aluminum alloy matrix and it is difficult to form a firm interface with the matrix, a semi-solid injection molding method is adopted. The alloy is the matrix and the graphene is the reinforcement. After powder mixing, feeding, quantitative transportation, heating, screw shearing, preparation of semi-solid slurry, and high-speed injection molding, the graphene-reinforced aluminum matrix composite material is made. This equipment method is advanced and The data is accurate and detailed, the process is rigorous, and the prepared graphene-reinforced aluminum-based composite material has a hardness of 82.2HV, a tensile strength of 235MPa, and an elongation of 7.22%. It is an advanced preparation method of graphene-reinforced aluminum-based composite materials.