6results about How to "Prevent cracking and falling off" patented technology

The utility model belongs to building external wall heat preservation and heat insulation technical field, and disclose a kind of integrated template of regulating building external wall heat preservation and heat insulation, including frame, the inside of frame is sequentially provided with self-repairing protective decorative layer, gradient composite heat preservation layer, self-adapting elastic buffer layer, structure template layer from outside to inside, the seal strip is arranged in the outside of frame, it is connected through adjusting connecting assembly between adjacent frame, gradient composite heat preservation layer is with rock wool board outer layer fire prevention, aerogel felt inner layer strong heat preservation, staggered joint and fireproof sealant block heat channel, adapt to severe cold region and high energy-saving standard, resolve single material contradiction, the coating of self-repairing protective layer automatic joint maintenance reduction, elastic buffer layer absorbs deformation and prevents cracking, prolongs heat preservation layer life, reduces whole cycle cost, guarantees air tightness and appearance.

The application discloses a dry quenching temperature and pressure increasing method, and belongs to the technical field of dry quenching of coking. The method increases the temperature in the dry quenching furnace, mainly restores the normal temperature of the dry quenching furnace body and internal working conditions, and increases the pressure, mainly gradually increases the boiler drum pressure, so as to restore the normal pressure of the whole dry quenching circulating system. The core purpose of temperature and pressure increasing is to increase the temperature of the dry quenching furnace and the temperature and pressure of the circulating system according to the planned scheme, avoid the heat shock damage or damage of the dry quenching refractory material and equipment caused by unplanned temperature and pressure increasing operation of the system, guarantee the safety of the furnace body refractory material and the circulating equipment, and create conditions for the system to restore normal production.

The application relates to the technical field of building materials, in particular to a core material for A-grade fireproof metal composite board and a preparation method thereof. According to weight parts, the core material for the A-grade fireproof metal composite board comprises the following raw materials: 30-60 parts of base resin, 20-40 parts of flame retardant, 5-10 parts of modified montmorillonite, 0.5-2 parts of coupling agent, 0.5-3 parts of dispersant, 1-3 parts of compatibility agent and 0.5-3 parts of lubricant. The core material has excellent flame retardancy, antibacterial property and mechanical property.

The invention provides a brazing method of a heat exchanger assembly, the heat exchanger assembly comprises a heat exchanger body and a heat exchange tube, and the outer surface of the heat exchanger body is provided with a heat exchange groove. The brazing method comprises the steps that S1, the heat exchange pipe is coiled into the shape matched with the heat exchange groove in advance through a profiling mold; s2, the surfaces of the heat exchange tube and the heat exchanger body are plated with nickel; s3, the heat exchange tubes are embedded into the heat exchange grooves, and the heat exchange tubes are pressed and fixed through pressing blocks with chamfers; s4, the brazing filler metal is applied to the edge of the contact face of the heat exchange pipe and the heat exchange groove in a differentiated mode, and the surface, where the brazing filler metal possibly flows through, of the heat exchanger body is coated with a solder resist; and S5, the heat exchanger assembly is brazed in a stepped heating mode. According to the method, through cooperative implementation of multiple steps such as heat exchange tube preforming, composite nickel plating, precise fixing, differential brazing filler metal applying and stepped temperature rising, tight attachment of the thin-walled tube and the complex curved surface heat exchanger is achieved, the bonding strength and stability of a brazed joint are improved, brazing defects are effectively eliminated, and the product percent of pass is increased.

The invention discloses a carbon ceramic heating body material with a gradient SiC structure and a preparation method thereof, and belongs to the technical field of high-performance composite materials. The preparation method comprises the following steps: preparing a carbon fiber preform with density gradient; carrying out CVI densification to obtain a gradient C / C porous body; then forming a SiC / C / SiC composite matrix with a gradient SiC structure through an RMI process; and finally, preparing the SiC protective coating on the surface of the SiC / C / SiC composite matrix through CVD (Chemical Vapor Deposition). According to the invention, by constructing the gradient structure with the interior rich in C and the exterior rich in SiC, the resistance of the heating element is mainly controlled by an internal C / C main body, and excellent resistance stability is ensured; and meanwhile, the gradient SiC layer effectively relieves thermal stress, the surface coating is prevented from cracking and falling off, the thermal shock resistance and the oxidation resistance of the material are remarkably improved, the service life of the material is remarkably prolonged, and unification of long service life, high corrosion resistance and stable resistance is achieved.

The application discloses a buckle type square tube for a semiconductor frame and a production process thereof, relates to the technical field of buckle type square tubes, and discloses a buckle type square tube for a semiconductor frame and a production process thereof, which is aimed at the problems of easy corrosion and abrasion of Q345 square tubes in a semiconductor workshop, corrosion dust pollution of components and devices, adopts a base material step-by-step polishing pretreatment, an aluminate system plasma electrolytic oxidation to prepare a ceramic bottom layer, and a composite process of a multiphase joint surface layer prepared through hydrothermal and liquid phase deposition, and has excellent wear resistance and all-weather corrosion resistance. The application solves the defects of weak bonding force of single surface treatment, and the incapability of corrosion resistance and wear resistance to cooperate, is suitable for complex working conditions of the semiconductor frame, has no dust pollution, and greatly improves the service life.