21results about How to "Small volume shrinkage" patented technology

The invention relates to the technical field of porous material preparation processes, in particular to a preparation method of light low-thermal-conductivity lutetium silicate aerogel, which comprises the following steps: preparing composite sol; preparing and aging wet gel; drying the gel; preparing the aerogel; the lutetium silicate aerogel is prepared by combining in-situ sol-gel with a supercritical drying process, and the lutetium silicate aerogel has relatively high porosity, can be in a light, crack-free and complete block shape, and can be used for near-net size forming; the method is simple to operate, can realize fluidized production, and is easy to industrialize; the lutetium silicate ceramic aerogel prepared by adopting an in-situ synthesis mode has higher porosity, better thermal stability and lower thermal conductivity, and can tolerate the extreme temperature of 1500 DEG C.

The invention discloses a method for preparing a high-performance closed-cell perlite material by a chemical method, the prepared high-performance closed-cell perlite material is mainly used in the field of buildings, and the method comprises the following steps: S1, expanding; s2, film covering; s3, dispersing; s4, grading; according to the invention, a layer of silica sol film is formed on the surface of the closed-cell perlite, the film layer not only significantly reduces the volume shrinkage of the closed-cell perlite in the subsequent slurry stirring process, but also effectively hinders the expansion of cracks in the perlite and greatly reduces the cracking risk, and meanwhile, the heat conductivity coefficient of the material is also reduced by film coating treatment, so that the thermal conductivity of the material is improved. The thermal insulation performance is obviously improved; according to the drying furnace, through cooperative use of the drying mechanism and the adjusting mechanism, the air outlet pipe can be driven to swing up and down in a reciprocating mode, so that the air blowing angle of the air outlet pipe is adjusted according to use requirements, hot air can be blown to different areas in the furnace body, the air blowing range is widened, and the perlite drying effect is improved.

The present invention relates to a modified fly ash-based mining filling material and a preparation method thereof, wherein the material comprises components such as modified fly ash, lime, cement, gypsum, sodium sulfate and epoxy resin. The dispersibility of fly ash is improved by using a composite modification system of nitrogen-containing silane coupling agent, triethanolamine and organic acid, so that the fly ash is evenly distributed in the slurry; lime, gypsum and sodium sulfate are used as activators, so that the filling material maintains good strength and stability at high temperatures, avoiding the risk of structural damage due to temperature increase; at the same time, the material will not be excessively brittle or have reduced strength under low temperature conditions. In addition, the added epoxy resin can effectively bond materials such as fly ash and cement into a filling body with certain strength and stability due to its excellent bonding properties. The epoxy resin also helps to reduce the internal stress and deformation of the material after curing, ensuring the long-term stability of the filling body. The filling material of the present invention is particularly suitable for mine filling and support operations, and can provide a reliable filling effect under extreme temperature conditions.

The application discloses a kind of low-carbon cementing material by waste incineration fly ash excited ore powder and preparation method thereof, by weight percentage, including the following components: modified waste incineration fly ash 8~12%, ion complex component 1~3%, composite shrinkage component 2~6%, ore powder 55~65%, water 23~28%.Preparation method includes the following steps: S1, preparation modified waste incineration fly ash, ion complex component, composite shrinkage component;S2, modified waste incineration fly ash, ion complex component, composite shrinkage component, ore powder, mixing water, fully mixed and stirred evenly, can obtain the low-carbon cementing material by waste incineration fly ash excited ore powder described in the application.In the aspect of component design, the application is environmentally friendly, low cost, in the performance aspect, the flow rate can be adjusted, the mechanical properties are excellent, the volume shrinkage is small.

The application belongs to the technical field of refractory materials for blast furnace ironmaking, and particularly relates to a thermal shock cracking resistant taphole clay material and a preparation method thereof. The taphole clay material comprises aggregates, matrix powder and a binder system; the binder system is composed of polysilazane, isocyanate curing agent and B4C micropowder. By introducing polysilazane as the main binder, the application realizes high ceramic yield and low volume shrinkage by using the characteristics of polysilazane being converted into Si-B-C-N ceramic at high temperature. Meanwhile, B4C micropowder is oxidized to generate B2O3 at high temperature, which fills pores, promotes sintering and protects carbon phase, so as to realize volume shrinkage compensation and high temperature strength improvement. The taphole clay material has low shrinkage rate, high cold compressive strength, high high-temperature bending strength and excellent thermal shock cracking resistance, and solves the technical problems of poor volume stability and insufficient high-temperature strength of traditional taphole clay caused by binder carbonization shrinkage.

This invention discloses a silicate colloid for high-solids-content, high-modulus composite fire-resistant glass and its preparation method, relating to the field of composite fire-resistant glass technology. Specifically, it describes a silicate colloid for high-solids-content, high-modulus composite fire-resistant glass and its preparation method. The colloid, by weight percentage, comprises a silicon source, water, glycerol / ethylene glycol / polyethylene glycol / polyglycerol, water-soluble organic acids and salts, water-soluble metal oxides or hydroxides, and alkali metal hydroxides, wherein the solids content is 60-75% and the modulus is 4.0-5.5. The preparation method includes: uniformly mixing the silicon source, water, additives, and functional additives, then adding alkali metal hydroxides, reacting at 50-90°C to obtain a prepolymer solution, followed by vacuum degassing. The viscosity is adjusted to the desired range by controlling the reaction conditions. This prepolymer solution is suitable for pouring or coating processes. After curing, the colloid forms a fire-resistant glass core layer. The resulting fire-resistant glass has advantages such as high light transmittance, ultra-thinness, dense foaming, low-temperature resistance, high weather resistance, and long lifespan.

The utility model belongs to the technical field of ceramic badges, and particularly relates to low-shrinkage ceramic and an electronic badge made of the ceramic, the low-shrinkage ceramic comprises a framework layer, a fiber layer and a filler layer, the fiber layer is of a three-dimensional net structure, the framework layer is embedded in meshes of the three-dimensional net structure, and the filler layer is arranged in the framework layer. And the filler layer particles are filled in a gap between the framework layer and the fiber layer. The problems of unstable size, uneven surface and the like of a traditional ceramic electronic badge caused by high shrinkage rate of a ceramic material are effectively solved through the low-shrinkage ceramic, the electronic badge can be accurately formed in the manufacturing process, and the design size and the appearance quality are kept.

The invention relates to a low-temperature crystallization preparation method of a sol-gel metal oxide film, and belongs to the technical field of metal oxide films and sol-gel. Firstly, sol containing metal salt is prepared; then spin-coating the sol on the surface of a clean substrate, standing and curing, and forming an amorphous film on the surface of the substrate; and putting the substrate into a microwave plasma chamber, enabling the amorphous film surface to face upwards, and processing the film by using oxygen plasma to obtain the crystalline metal oxide film. Microwave is selected as an oxygen plasma excitation source, low temperature is kept by adjusting power and pressure intensity, and general preparation of the high-quality metal oxide thin film is achieved by combining the advantages that components of a sol-gel method are adjustable and large-area preparation is easy to achieve.

The invention discloses an evaluation method for silver powder sintering activity, and belongs to the technical field of silver powder performance testing, the method comprises the following steps: putting silver powder into a mold for sintering, taking out a silver material after sintering, immersing the silver material into an oily solution, discharging bubbles, taking out the immersed silver material, and removing the oily solution on the surface of the silver material to obtain a sintered silver sample; the volume shrinkage rate of the sintered silver sample is calculated by utilizing the volumes of the silver powder and the silver sample before and after sintering, and the sintering activity of the silver powder is evaluated by utilizing the volume shrinkage rate. According to the method, the sintering activity of the silver powder is evaluated by measuring the volume shrinkage rate after sintering according to the volume change of the silver powder before and after sintering, the volume shrinkage rate is large, and the sintering activity is high; the method has the advantages of small volume shrinkage, low sintering activity, high efficiency, objectivity and quantifiability.

This invention relates to the field of ceramic additives, specifically to an additive and its preparation process for inhibiting high-temperature cracking in ultra-high temperature ceramic precursors. This additive addresses the problem that traditional additives cannot effectively inhibit high-temperature cracking in ceramic precursors. By combining functional nanoparticles, functional filler slurry, and nanofillers, this additive achieves a four-fold synergistic crack inhibition mechanism during the pyrolysis of ultra-high temperature ceramic precursors: physical support framework, chemical reaction compensation for shrinkage, organic phase decomposition to relieve gas stress, and in-situ generation of nanocrystals to pin cracks. This additive exhibits good compatibility with various ceramic precursor systems, requires only a small dosage, and can significantly eliminate macroscopic cracks and reduce volume shrinkage, while simultaneously improving ceramic yield and optimizing microstructure.

This invention proposes a low-shrinkage photocurable elastic resin composition based on synergistic compensation and its application. The resin composition has low viscosity and excellent photocurable printing properties. During molding, the non-reactive diluent is volatilized first by a simple stepwise heating of the printed model, and then the temperature is raised to the foaming temperature to cause the thermally expanding microspheres to expand and foam. At this temperature, the chain extender is further condensed. Through the synergistic effect of the non-reactive volatile diluent and the thermally expanding microspheres, physical compensation for curing shrinkage is achieved, which can meet the requirements of both low shrinkage and high elasticity. The method is simple and easy to implement and suitable for industrial applications.

The invention discloses a method for improving the deep-frying deformation resistance of a fish recombinant product, and belongs to the technical field of aquatic product processing. According to the method for improving the deep-frying deformation resistance of the fish recombinant product, starch with low amylose content is added in the preparation process of the recombinant minced fillet, the starch is fully swelled and filled in gel pores in the minced fillet, protein conformation change is regulated and controlled, formation of a more compact and stable network structure is facilitated, and the deep-frying deformation resistance of the fish recombinant product is improved. And the problem of deformation caused by thermal expansion and cold contraction in the frying process of the recombinant fish product can be effectively solved, so that the frying deformation resistance of the recombinant fish product is improved. Theoretical support and technical practice are provided for high-value development of minced fillet products and accurate application of starch in a fried gel system.

The invention relates to the technical field of cement paste, in particular to a nano styrene-butadiene latex flexibilizer and a preparation method thereof, and further comprises high-temperature-resistant and carbon dioxide corrosion-resistant cement paste and a preparation method thereof. The nano styrene-butadiene latex flexibilizer is prepared by the following steps: firstly, preparing a temperature-resistant monomer pre-emulsion and a toughening monomer pre-emulsion in advance; adding a part of the temperature-resistant monomer pre-emulsion and a part of the toughening monomer pre-emulsion into the molecular weight regulator solution to obtain emulsion seeds, then adding the balance of the temperature-resistant monomer pre-emulsion, the balance of the toughening monomer pre-emulsion and an initiator into the emulsion seeds for reaction, and finally, obtaining the temperature-resistant and toughening-type emulsion composite material. And washing, drying and crushing the obtained reaction product to obtain the nano styrene-butadiene latex flexibilizer. The high-temperature-resistant carbon-dioxide-corrosion-resistant cement paste can improve the strength of the first cementing surface and the second cementing surface of a well cementation cement sheath, reduce the permeability of set cement and prevent carbon dioxide from eroding the set cement.

This invention relates to the field of semiconductor packaging materials technology, specifically disclosing a low-dielectric filler for packaging chips and its preparation method. The invention uses fluorosilicone-modified benzoxazine, fluorosilicone-modified alicyclic epoxy resin and dicyclopentadiene cyanate prepolymer crosslinking to form a low-viscosity polymer, and then adds low-dielectric filler F-mesoporous SiO2 and functional additives. The resulting low-dielectric filler has low viscosity, can fill ultrafine gaps well, and after curing, the filler has low volume shrinkage and good high-frequency dielectric properties.

The invention discloses a preparation method of SiBCN aerogel based on triethanolamine borate molecular-level doping, and belongs to the field of high-temperature-resistant thermal protection materials. According to the method, triethanolamine borate is taken as a boron source and a nitrogen source, molecular-level uniform doping of boron and nitrogen elements is realized through a sol-gel process, and the SiBCN aerogel is obtained after aging, modification and drying. The fiber felt can also be immersed in the sol, and gelation post-treatment is carried out synchronously, so that the composite material is prepared. High-bond-energy chemical bonds are generated through boron-nitrogen source molecular-level in-situ doping, shrinkage sintering of the material at high temperature is inhibited, and excellent heat insulation performance is kept. After the fiber felt is introduced, the mechanical property is greatly improved, the compressive strength of 50% compressive deformation is 0.2-0.5 MPa, the volume shrinkage rate of the material at 1000-1100 DEG C is extremely low (1-3%), meanwhile, the material has the thermochromic function that the color is deepened along with the increase of heating time, and a new material solution is provided for extreme environment thermal protection and post-disaster thermal history tracing.

The invention discloses a preparation method of a high-entropy zirconate PVD (Physical Vapor Deposition) ceramic thin film. The preparation method comprises the following steps: carrying out spray granulation on five rare earth oxides, namely nano Sm2O3 powder, nano Eu2O3 powder, nano Tb2O3 powder, nano Dy2O3 powder, nano Lu2O3 powder and nano ZrO2 powder, and zirconium oxide to obtain target raw material powder; screening to obtain spherical powder with different particle size ratios, manufacturing a target blank by utilizing cold isostatic pressing, and then sintering the blank target; the high-entropy zirconate EB-PVD target material is deposited on the surface of a PVD base material with the flat and smooth surface through the PVD technology, and the high-entropy zirconate PVD ceramic film is formed. The high-temperature stability of the high-entropy ceramic thin film prepared by utilizing the PVD technology is obviously improved, the high-entropy ceramic thin film can bear the environment of 1500 DEG C or above, the interface bonding force is enhanced, and the high-entropy ceramic thin film meets the use requirement of multiple thermal cycles.

This invention discloses a UV-curable solvent-free hot-press adhesive and its preparation method, belonging to the field of polymer materials. The UV-curable solvent-free hot-press adhesive contains 9 components by weight, including 5-10 parts of liquid polybutadiene and 10-20 parts of polyurethane acrylate oligomer. In the preparation process, some raw materials are first mixed, ester-soluble TPU is added for dissolution, a photoinitiator is added in the dark, and end-capping isocyanate is added after cooling. The application requires three steps: coating, UV curing (wavelength 365-405nm, light intensity 150mJ / cm²), and hot-pressing (120-140℃). Compared with traditional hot-press adhesives, it has no VOC emissions, high production efficiency, low energy consumption, and excellent adhesion performance (peel force 17.3-33.5N / 25mm).

This invention discloses a method for preparing monolithic SiC nanowire aerogels via in-situ carbothermal reduction, as well as the SiC nanowire aerogels prepared by this method and their applications, belonging to the field of advanced ceramic materials and aerogel preparation technology. This method uses biomass-derived cellulose fibers as the carbon source and three-dimensional template, silica nanoparticles as the silicon source, and NH4Cl as a volume shrinkage inhibitor. Through precursor preparation, freeze-drying, carbothermal reduction, and post-treatment steps, the controllable preparation of monolithic SiC nanowire aerogels is achieved. This invention features a simple, green, and economical process, is easily scalable, and allows for near-net-shape forming of complex shapes through mold design. The prepared aerogel has a three-dimensional interwoven nanowire network structure with a porosity as high as 99.7% and a thermal conductivity as low as 0.045 W / (m·K). It also exhibits excellent superelasticity, high-temperature stability, and high-efficiency oil absorption capacity, making it suitable for applications such as aerospace high-temperature insulation, energy system protection, and oil pollution treatment.

The invention relates to the technical field of castable, in particular to high and low temperature self-adaptive foamed ceramic castable and a preparation method thereof. According to the high-low-temperature self-adaptive foamed ceramic castable, the high-temperature foamed ceramic balls and the aluminum oxide hollow balls are used as filler, the porosity of the castable is increased, the heat conductivity coefficient of the castable can be effectively reduced, and due to the fact that the high-temperature foamed ceramic balls expand in volume in a high-temperature environment, the heat conductivity coefficient of the castable is increased. The castable has the beneficial effects that by adding the silicon micro-powder, the overall volume shrinkage of the castable is reduced, so that the strength of the castable is ensured, the generation and diffusion of cracks at the sealing joint are inhibited, and the castable has good mechanical strength, heat insulation performance and high-temperature working performance by cooperating with the mullite aggregate, the silicon micro-powder and other components.

The invention provides environment-friendly elastic polyester putty for a high-speed rail and a preparation method thereof.The environment-friendly elastic polyester putty for the high-speed rail comprises a component A and a component B. The component A comprises unsaturated polyester resin, titanium dioxide, hollow microspheres, a diluent monomer, a stabilizer, a dispersing agent, a flatting agent and a drier; the component B comprises peroxide, fumed silica and an ester plasticizer, the invention also provides a preparation method of the elastic polyester putty, and the prepared putty product is green and environment-friendly, is not easy to fall off, and also has excellent impact resistance, sanding property and temperature change resistance; and the requirement of long-term operation of the high-speed rail under high-speed and high-temperature-difference environment conditions can be well met.