53results about How to "Good phase change performance" patented technology

The invention discloses a magnetic microencapsulated phase change energy storage material with magnetic and thermal energy storage functions and a preparation method thereof. A wall material of microcapsules is a magnetic ferrite / silica inorganic hybrid material with the magnetic function and a core material can be paraffin and a higher fatty alcohol, acid and ester type organic phase change energy storage material. The preparation method of the magnetic microencapsulated phase change energy storage material disclosed by the invention comprises the steps of firstly synthesizing magnetic ferrite nanoparticles and further assembling the magnetic ferrite nanoparticles in a solvent to the surfaces of suspended oil droplets of the organic phase change energy storage material through a Pickering emulsion technology; finally forming silica gel on the surface of the phase change energy storage material through an interfacial polymerization technology to fix the magnetic ferrite nanoparticles on the surfaces of the oil droplets of the organic phase change energy storage material so as to form the microcapsules using the magnetic ferrite / silica hybrid wall material to coat the phase change energy storage material.

The invention discloses a low-temperature deposition method for a vanadium dioxide thin film. A magnetron sputtering technique is adopted; vanadium metal or vanadium alloy is taken as a target; oxygen is taken as a reactant gas; argon is taken as a sputtering gas. A vacuum chamber is vacuumized until the air pressure is below the background vacuum of 1*10<-3> Pa before the thin film is prepared; then a mixed gas of the oxygen and the argon is pumped in, and oxygen partial pressure is held to be 0.01-0.06 Pa; in the process of deposition of the thin film, the deposition temperature is controlled to be 240-260 DEG C and negative bias is added to a base, the sputtering power density of the target surface is 2-3 W / cm<2> and the high-property VO2 thin film is obtained on the surface of the base. According to the low-temperature deposition method for the vanadium dioxide thin film, the deposition temperature of the VO2 thin film is low and is matched with appropriate negative bias and other technological parameters to prepare the high-property VO2 thin film which is even and compact, low in phase transition temperature of the vanadium dioxide and good in phase transition property; the production cost is greatly reduced.

The invention provides a preparation method of an in-situ encapsulated and networked regenerated cellulose phase-change fiber, comprising the following steps: adding glycerol tristearate phase-change material into chitosan solution, stirring well, adding N,N-methylenebisacrylamide crosslinking agent and ammonium persulfate initiator, stirring well to form a microcapsule solution; adding sodium alginate powder and nano silver powder into the regenerated cellulose solution, stirring well, adding glutaric dialdehyde crosslinking agent, and stirring well to form cellulose spinning matrix; loading the microcapsule solution to a spraying device, spraying the microcapsule solution evenly to the cellulose spinning matrix, stirring at high speed, dropwise adding ammonium persulfate initiator, and heating and stirring to form spinning dope; subjecting the spinning dope to vacuum suction filtering and defoaming, and coagulating via wet spinning to form the capsulated networked regenerated cellulose phase-change fiber.

The invention discloses a phase change microcapsule temperature self-adjusting GRC dry-mixed mortar surface layer material. The surface of a phase change microcapsule is coated with a layer of a cement material to make the phase change microcapsule have a hard shell in order to guarantee the integrity of the phase change microcapsule in the stirring processing process, and carbon fibers are added in order to improve the heat conduction performance of the outer wall of the phase change microcapsule. The phase change microcapsule dry-mixed mortar material produced in the invention can be applied to make the surface layer of glass fiber concrete (GRC), and the GRC produced in the invention has an excellent temperature self-adjusting function.

The invention discloses a penetration fusion welding method for a high-strength dual-phase steel thick plate through a high-speed laser filler wire. The main welding technical parameters are that theoptical fiber Nd:YAG laser filler wire is used for butt-joint penetration fusion welding, the welding seam prefabricated butt-joint gap is 1.0-1.6 mm, the focal length of a collecting lens is 15 cm, the defocus distance is -10-3 mm, the laser power is controlled to be 1.8-6 kW, the welding speed is controlled to be 10-60 mm.s<-1>, the welding wire diameter is 1.2-2.0 mm, and the wire feed speed is20-240 mm.s<-1>. The width of an obtained welding seam welding heat affected zone is smaller than 0.6 mm, the welding seam zone is of a coarse martensitic structure, the welding heat affected zone take a thin martensitic structure as priority, the hardness of a welded joint is 370-450 HV0.1, and the tensile strength of the welded joint is close to or even exceeds that of a base material. Throughthe effects of rapid cooling martensite strengthening and alloy strengthening, the hardness and strength of the welded joint are greatly improved.

The invention relates to a nano VO2 film with a superhydrophilic self-cleaning function and an intelligent temperature control function and a preparation method of the nano VO2 film. The preparation method of the nano VO2 film comprises the steps that firstly, a precursor solution of vanadium dioxide is prepared through a sol-gel method; then a substrate is evenly coated with the precursor solution; and finally one-step annealing is conducted, so that the nano VO2 film is obtained. A corresponding tungsten-doped VO2 film can be obtained by directly adding a tungsten source in the precursor solution, and the phase-change temperature can be adjusted to 32 DEG C; the crystal sizes of VO2 particles can be changed through tungsten ion doping, a certain micro-nano structure is formed on the surface of the substrate, and the superhydrophilic self-cleaning function at the water contact angle of 12 degrees is achieved; in addition, the difference of the light transmittance before the phase change and the light transmittance after the phase change of the film in the position with the visible light transmittance being 80% and the wavelength being 2000 nm is 26%, and an extremely good intelligent temperature control effect is achieved.

The invention discloses a segmented heat storage composite phase change material and a preparation method thereof. The composite phase change material comprises the following raw materials in percentage by mass: 15-50% of a hydrated salt phase change material, 0.5-3% of a nucleating agent, 1-2.5% of an emulsifier, and 55-80% of an organic phase change material. The preparation method comprises thesteps of melting the organic phase change material by heating, maintaining the temperature higher than the phase change temperature of the organic phase change material by 1-10 DEG C, adding the emulsifier, and stirring to obtain a uniform mixture; heating the hydrated salt phase change material till melting, adding the nucleating agent, controlling the temperature of the hydrated salt phase change material to be the same as the temperature of the mixture, and stirring to mix the hydrated salt phase change material and the nucleating agent uniformly; mixing the two materials while stirring toobtain a water-in-oil phase change emulsion, so as to obtain a solid segmented heat storage composite phase change material. The sum of latent heat of the two phase changes of the material reaches 162.7-204.7 J / g, and the problem of volatilization of free water produced after the hydrated salt is melted is solved.

The invention discloses a Sb2Tex-SiO2 nano composite phase change material used on a phase change memory. The material is formed by compositing a phase change material Sb2Tex with SiO2 and has a chemical formula of (Sb2Tex)y(SiO2)1-y, wherein x is larger than or equal to 0.5 but smaller than or equal to 3 and y is larger than or equal to 0.2 but smaller than 1. The Sb2Tex-SiO2 nano composite phase change material has the advantages that through doping the SiO2 into the phase change material, the phase change material with a reversible phase change ability is isolated into areas with nanoscales by the amorphous state SiO2, and a composite structure is formed, so the resistivity and the crystallization temperature of the phase change material are increased and the heat conductivity of the phase change material is reduced. Due to the increase of the crystalline state resistance of the phase material, a Reset current of the phase change memory device can be reduced, and thereby the barrier that the Reset current of the phase change is overlarge is overcome; due to the rising of the crystallization temperature, the stability of the Sb2Tex-SiO2 phase material device can be improved; dueto the decline of the melting temperature, the power consumption of the Sb2Tex-SiO2 phase material device is effectively reduced; and due to the reduction of the heat conductivity, the utilization rate of energy can be improved.

The invention discloses a penetration fusion welding method for a high-strength dual-phase steel thick plate through a high-speed laser filler wire. The main welding technical parameters are that theoptical fiber Nd:YAG laser filler wire is used for butt-joint penetration fusion welding, the welding seam prefabricated butt-joint gap is 1.0-1.6 mm, the focal length of a collecting lens is 15 cm, the defocus distance is -10-3 mm, the laser power is controlled to be 1.8-6 kW, the welding speed is controlled to be 10-60 mm.s<-1>, the welding wire diameter is 1.2-2.0 mm, and the wire feed speed is20-240 mm.s<-1>. The width of an obtained welding seam welding heat affected zone is smaller than 0.6 mm, the welding seam zone is of a coarse martensitic structure, the welding heat affected zone take a thin martensitic structure as priority, the hardness of a welded joint is 370-450 HV0.1, and the tensile strength of the welded joint is close to or even exceeds that of a base material. Throughthe effects of rapid cooling martensite strengthening and alloy strengthening, the hardness and strength of the welded joint are greatly improved.