7results about How to "Wide application temperature range" patented technology

This invention discloses a method for preparing high-temperature resistant polyimide foam material, comprising: preparing a foamable precursor powder using aromatic dianhydride and diamine; performing bilayer extrusion and foaming molding using two single-screw extruders, wherein one extruder extrudes and foams the foamable precursor powder, and the other extrudes fiber-reinforced thermoplastic resin; the two are compounded at a co-extrusion die, and shaped by a shaping die to obtain a polyimide foam composite material with a fiber-reinforced resin layer on the surface; cutting and collecting polyimide foam strips or foam particles of equal length, filling them into a die, and then hot-pressing to obtain the polyimide foam composite material. This invention significantly improves the operability of polyimide foam preparation and simplifies subsequent molding processes. This invention also provides a high-temperature resistant polyimide foam material obtained by the above preparation method, which can simultaneously provide high compressive strength, high modulus, and low density, and is easy to scale up for production.

The application relates to the technical field of drilling fluid borehole wall stabilizing materials, and discloses a composite material, a preparation method of the composite material, a drilling fluid anti-sloughing material and application. The composite material comprises the following steps: reacting an oil phase solvent, polyether polyol, an organic silicon modifier, an alcohol amine modifier and nano particles, wherein the weight ratio of the oil phase solvent, the polyether polyol, the organic silicon modifier, the alcohol amine modifier and the nano particles is 100:10-100:1-20:0.5-20:1-50. The composite material can significantly improve the softening point of asphalt material, widen the material application temperature range, improve the plugging performance of the material, reduce the filtration loss, enhance the adsorption capacity of the material to the surface of micro cracks at high temperature, and improve the borehole wall stability of hard and brittle strata.

This invention belongs to the fields of powder metallurgy and materials science and technology, specifically disclosing a preparation process for a high-wear-resistant WC-based composite material. The process involves preparing WC powder, second-phase powder, and graphene material; adding the graphene material to a dispersion medium and performing ultrasonic dispersion; mixing the graphene dispersion with the WC powder and second-phase powder and ball milling; drying the mixture using a vacuum rotary evaporation drying process; and densifying it using a hot-pressing sintering process. This invention enables the WC-based composite material to simultaneously achieve high hardness and high fracture toughness; effectively inhibits oxidative wear of the WC-based composite material at high temperatures, improving its high-temperature wear resistance; and achieves uniform and stable dispersion of the graphene reinforcing phase in the WC matrix, avoiding agglomeration, thereby fully utilizing its strengthening and lubrication effects. The composite material prepared by this invention is particularly suitable for use as high-speed cutting tools, high-temperature molds, and high-temperature moving parts in aerospace applications, and has broad application prospects.

The embodiment of the invention provides a high-temperature heat storage-supercritical steam generation system. The high-temperature heat storage-supercritical steam generation system comprises a heat storage body, a supercritical steam generation unit connected with the heat storage body and an intelligent control unit connected with the supercritical steam generation unit. The heat storage body comprises a solid waste-based graded porous carrier and fused salt filled in gaps of the solid waste-based graded porous carrier; the supercritical water vapor generating unit comprises a water vapor generator with a built-in spiral metal pipe and a multi-stage heat exchange runner; the intelligent control unit comprises a digital controller, an axial-flow compressor and a heat exchange pump, the digital controller is connected with the axial-flow compressor, the heat exchange pump and the heat storage body, and the digital controller is configured to dynamically adjust the running states of the axial-flow compressor, the heat exchange pump and the heat storage body.

This utility model relates to the field of busbar technology, and particularly to a high-temperature resistant insulating busbar. A high-temperature resistant insulating busbar includes a busbar conductor, the outer surface of which is coated with ceramic silicone, the outer surface of which is coated with fiberglass cloth or a polyimide film, and the outer surface of which is coated with a polyamide insulating layer. This utility model utilizes the complementary properties of polyamide and ceramic silicone to solve the problem of decreased mechanical properties and loss of insulation performance of traditional materials at high temperatures. Through the development of special pretreatment and composite processes, the interfacial bonding force between polyamide and ceramic silicone is enhanced, preventing delamination and peeling under high-temperature thermal stress. This achieves a uniform and dense coating of the insulating layer on the busbar surface, eliminating defects such as bubbles and impurities, and ensuring that the busbar still possesses reliable insulation performance and mechanical strength under high-temperature environments.

This invention discloses a method for preparing oriented long fiber reinforced polyimide foam material, comprising: adding fatty alcohol, aromatic dianhydride and end-capping agent to a solvent for esterification reaction; adding diamine to continue the reaction; drying to remove solvent and obtain RTM-type foamable precursor; mixing and extruding linear thermoplastic polyimide resin with RTM-type foamable precursor, uniformly distributing long fibers on the inner wall of a custom die head, achieving tight encapsulation of oriented long fibers during extrusion; cutting the material to a fixed length and completing volumetric foaming in a foaming mold. This invention also discloses an oriented long fiber reinforced polyimide foam material, using long fibers as reinforcement and a mixed extrudate of linear thermoplastic polyimide resin and RTM-type foamable precursor as the matrix, which improves the flexural strength, compressive strength and toughness of the polyimide foam material, and can be applied to foam sandwich materials in the aerospace field, radar dome sandwich materials, etc.

This invention provides a spray humidification device for use in HVAC laboratories, comprising: a water storage chamber, a horizontally arranged open cavity for storing humidification water at a set level; and an atomizing module, a two-fluid nozzle including a water inlet, an air inlet, and a spray end. The water inlet of the two-fluid nozzle is inserted below the set water level in the water storage chamber, its air inlet is connected to compressed air and equipped with a regulating valve, and its spray end faces the humidification area. Using this humidification device, by setting a liquid level monitor in the water storage chamber and controlling the water level accordingly, the spray siphon height in the water storage chamber can be precisely maintained, improving the control accuracy and atomization effect of humidification. The axially distributed nozzle arrangement allows for expansion of the humidification volume and humidification area. By adding a water circulation system and a liquid constant-temperature heater, the humidifier is prevented from freezing at low temperatures, expanding the application temperature range of the humidifier.