205results about How to "Improve impregnation efficiency" patented technology

The invention discloses novel liquid polycarbosilane which is low in viscosity and high in storage stability and is crosslinkable, a preparation method of novel liquid polycarbosilane, and an application of novel liquid polycarbosilane. Polycarbosilane is prepared by adopting chloromethyl alkoxy silane or mixtures of chloromethyl alkoxy silane as raw materials by virtue of Grignard coupling reaction and reduction reaction, and the structure of polycarbosilane is shown in a formula (I) in the specification. The structure simultaneously contains Si-H bonds and unsaturated bonds such as C=C bonds, can be subjected to self-crosslinking and curing under a certain condition, has relatively high ceramic yield, and can be used as a silicon carbide precursor of a polymer precursor impregnation pyrolysis (PIP) process. Polycarbosilane disclosed by the invention is adjustable in structural composition, good in storage stability, low in viscosity and relatively low in boiling point, and has the utilization potentiality of being used as a silicon carbide ceramic precursor for chemical vapor deposition/chemical vapor infiltration (CVD/CVI). In addition, polycarbosilane can also be used for replacing commonly-used divinyl benzene to serve as a crosslinking agent of solid-state polycarbosilane (PCS).

The invention relates to technical wood and a manufacture method thereof. The manufacture method comprises the steps of dying and drying eucalyptus and poplar veneers, conducting gum dipping and thickening on the wood veneers by using an ultrasonic vibration method, assembling gum dipping boards, conducting semi-solidification hot-pressing maintaining by using a curve die high-frequency press, conducting square slicing on the technical wood or cutting the technical wood into wood veneers, assembling the wood veneers in the same direction according to needed thickness, and conducting hot pressing and thickening. The thickness of the technical wood veneers or wood square produced by using the manufacture method is as high as 0.8-1.8kg/cm<3>, the thickness of the technical wood is more than 1.5 times of that of common technical wood, a plurality of items of physical and mechanical properties are improved by more than 1.5 times, the technical wood is not easy to crack, product durability improves to more than one time, service life of products is prolonged, and using fields of the products are extended.

The invention relates to a high-temperature-resistant wave-transparent silicon nitride fiber-reinforced composite material and a preparation method thereof. The method comprises the following steps: by using a two-dimensional fabric laying or three-dimensional four-direction knitted continuous silicon nitride fiber preform as a reinforcing body, carrying out interface coating preparation on the reinforcing body fiber surface with a polyboron azane precursor by half-vitrification; compounding the precursor mainly composed of polyboron azane with an impregnation liquid to prepare a base; and carrying out vacuum pressure impregnation, desolventization, pressure crosslinking curing and cracking densification to obtain the final silicon nitride fiber-reinforced composite material. The preparation method greatly enhances the impregnation efficiency, enhances the material density by 18-40%, and finally obtains the novel wave-transparent material system with excellent high temperature resistance. The strength retention rate of the material at 1200 DEG C and 1500 DEG C is 70-94%. Compared with the silicon nitride ceramic material, the novel wave-transparent material has obviously higher breaking strain.

The invention relates to a high-temperature-resistant high-strength aluminum oxide fiber enhanced composite material and a preparation method thereof. The preparation method comprises the following steps of: by taking a two-dimensional cloth paving layer and 2.5D woven or orthogonally three-dimensional woven continuous aluminum oxide fiber preform as an enhancer, preparing a matrix through a double nano composite impregnation liquid where silicon dioxide and aluminum oxide are uniformly mixed; and finally obtaining the aluminum oxide fiber enhanced composite material through the process of vacuum pressure impregnation, micro-positive pressure medium and low temperature pre-curing, micro-positive pressure curing and atmosphere temperature programming sub-sectional thermal treatment, wherein the mass ratio of silicon dioxide to aluminum oxide in the composite material is (19:1)-(12:8), and the volume content of the aluminum oxide fibers is 30-60%. The prepared composite material has a high-temperature-resistant property and a high-temperature mechanical property, and is high in compactness; the room temperature tensile strength of the material reaches 310+/-30MPa, the tensile strength at 1100 DEG C reaches 135+/-20MPa, and the tensile strength at 1200 DEG C reaches 90+/-10MPa; and compared with a similar quartz fiber enhanced silicon dioxide oxide/oxide composite material, the performance is improved by 4-5 times.

The invention discloses a fiber bundle fuse dipping die head for producing long fiber reinforced plastic and a dipping method. The fiber bundle fuse dipping die head comprises a die head shell, a contact fiber guiding roll and a non-contact fiber guiding roll pair which are arranged in the die head shell. The contact fiber guiding roll includes a coaxial drum body; the non-contact fiber guiding roll pair is a fixing roll or an automatic driving roll and has a round, polygon or multi-edge transverses section surface. The dipping method comprises the following steps: in a die cavity full of fusant, a fiber bundle alternately winds the drum body of the contact fiber guiding roll under the tension traction and penetrates through a gap between the non-contact fiber guiding roll pair, and the dipped fiber bundle is exported from a derivative channel. The invention can reduce the friction consumption of the single fiber, ensure that the fuse and the dipping of the continuous fiber bundle operate stably at high dipping line speed, improve the dipping efficiency and reduce the production cost of long fiber reinforced thermoplastic plastics.

The invention discloses a pretreatment device for improving wood impregnation efficiency and a method for impregnating woods by utilizing the device. The device comprises a wood pretreatment chamber in which a cavity is formed, an ultrasonic treatment system and pretreatment liquid, wherein to-be-treated woods are subjected to ultrasonic pretreatment. The method disclosed by the invention comprises the following steps: pretreating to-be-impregnated woods by using ultrasonic waves under normal pressure, and getting through a liquid moving channel in the woods by utilizing a cavitation effect of the ultrasonic waves, so that the liquid permeability of the to-be-impregnated woods is enhanced, and the effective channel area inside the woods is enlarged; impregnating the woods, and impregnating a wood impregnation modifier into the woods, so that the absorption dose of the impregnated woods is improved, the agent penetration depth is increased, the impregnation period is shortened, and the impregnation effect is improved. The treatment device disclosed by the invention is simple, convenient to operate and is suitable for treating various woods, and process treatment conditions are controllable.

The invention belongs to the technical field of food processing and specifically relates to a flavored low-fat white mushroom crisp chip and a preparation method thereof. The flavored low-fat white mushroom crisp chip comprises the following materials in parts by weight: 1000 parts of white mushrooms, 5-10 parts of konjac glucomannan, 10-80 parts of chitosan, 10-60 parts of salt, 60-200 parts of isolated soybean protein and 40-200 parts of a nutrition balancing agent. The preparation method comprises the following steps: pre-treating the white mushrooms, preparing impregnation liquid, carrying out vacuum soaking and ultrasonic coating, carrying out quick-freezing and slicing, carrying out vacuum frying and dehydrating, removing oil, and packaging. The prepared flavored low-fat white mushroom crisp chip has the advantages of being low in fat content, uniform in color, crisp in mouthfeel, full in nutrition, complete in product shape and almost free of fractures.

The invention discloses a three-dimensional fiber prefabricated-part enhancement mullite composite and a preparation method thereof. The preparation method comprises impregnating three-dimensional fiber prefabricated parts in an A1203-SiO2 composite sol to be impregnated, dried and subjected to low-temperature thermal processing to obtain the A1203-SiO2 impregnated three-dimensional fiber prefabricated parts; repeating the process till the weight gaining of the A1203-SiO2 impregnated three-dimensional fiber prefabricated parts is lower than 1% to obtain three-dimensional fiber prefabricated-part first intermediates, performing medium-temperature thermal processing, subjecting the medium-temperature thermal processed three-dimensional fiber prefabricated-part first intermediates to impregnation, high-pressure processing, drying, low-temperature thermal processing and medium-temperature thermal processing, circulation the process till the weight gaining is lower than 1%, and performing high-temperature thermal treatment. According to the composite and the preparation method thereof, by three-stage thermal treatment, the compactness of the three-dimensional fiber prefabricated-part enhancement mullite can be further improved, and the mechanical performance and the oxidation resistance of the enhancement composite are enhanced.

The invention relates to a preparation method for a carbon/a carbon heating unit with high resistance and high purity; in the method, carbon cloth and short carbon fiber web fetus are adopted to be alternately laminated or wound into a cylinder to form horizontal fabric which is added with vertical fabric along the thickness direction by adopting a needling technique to prepare a prefabricated body of the heating unit with a three-direction structure; the prefabricated body is processed with furfural acetone resin or phenolic resin vacuum pressure impregnation and curing treatment, charring at normal pressure and other densification techniques until the density reaches 1.55g/cm<3> and then high-temperature vacuum purification is carried out below 2,000 DGE C and the carbon/the carbon heating unit with high resistance and high purity can be produced after mechanical processing. The carbon/the carbon heating unit of the invention has outstanding features of high resistance and high purity and has the advantages of short production period, low production period and long service life, which is mainly applicable to a U-shaped heating unit of a polysilicon hydrogenation furnace as well as a large cylindrical heating unit of a polysilicon pulling furnace.

The invention discloses a Cf/MC-SiC composite material and a preparation method thereof. The Cf/MC-SiC composite material comprises a carbon fiber fabricated part, an MC substrate and an SiC substrate, wherein M is Zr or Hf, the MC substrate and the SiC substrate are uniformly filled in the holes of the carbon fiber fabricated part, in the Cf/MC-SiC composite material, the volume fraction of the MC substrate is 10%-20%, the volume fraction of the SiC substrate is 20%-30%, and the percentage of opening of 2%-10%. The preparation method comprises the following steps that (1) a precursor is soaked and split for preparing a Cf/MC blank; (2) a Cf/MC-C blank is prepared; (3) the Cf/MC-SiC composite material is prepared with a gas phase siliconizing method. The Cf/MC-SiC composite material has the advantages that the material is high in content of MC substrate, low in porosity, high in heat conductivity, excellent in oxidation resistance, ablation resistance and mechanical property and the like, and the preparation method is simple in technology and easy to implement.

The invention discloses a composite rubber hose for conveying LPG, LNG and strongly corrosive chemical solvent and a preparation method thereof. Low density polyethylene, ultra-high molecular weight polyethylene and macromolecule cross-linked polyethylene serve as raw materials; after scientific compound and vulcanization of a rubber hose, a chemical substance with a good adhesive property is obtained for preparing a liner film; meanwhile, corona treatment is carried out on the bonding face of the liner film and the bonding face of the rubber hose, and fiberglass reinforcing fiber with radiation protection performance is compounded on the surface layer; therefore, the surface layer of the rubber hose has good radiation protection performance, hidden danger of conveying pipelines caused by ionizing radiation is avoided, and finally the composite rubber hose which has the firmly bonded liner film, and is high in radiation protection and capable of conveying LPG, LNG and strongly corrosive chemical solvents is prepared, the hose can absorb as much as 97.5% to 99.5% of X-rays, gamma-rays and various neutrons in nuclear radiation, and the adhesive force (N/25mm) between the liner film and a rubber layer reaches 160-180.

The invention discloses precursor solution for carbide ceramics. The precursor solution uses an alkoxy compound of more than one refractory metal as solute, and uses divinylbenzene, vinyl group acetylenyl benzene or diacetylene-benzene as solvent, and the molar ratio of the solute to the solvent is 1 to between 0.2 and 2. The invention also discloses carbide ceramics and a preparation method thereof. The method comprises the following preparation steps: the precursor solution of the invention is evenly mixed and heated to between 150 and 300 DEG C, and then is insulated for 0.5 to 4 hours; the precursor after low temperature crosslinking treatment is heated to between 1, 200 and 1, 800 DEG C in an inert atmosphere or under a vacuum condition, and then is insulated for 0.5 to 2 hours for high temperature pyrolysis; and the carbide ceramics is obtained after temperature reduction. The precursor solution has the advantages of low viscosity, good stability, simple preparation process, and so on. The method for preparing the carbide ceramics has the advantages of high impregnation efficiency, simple crosslinking process, high ceramics yield, and so on.

The invention discloses a thermoplastic composite preimpregnation body plate, which is prepared by a thermoplastic composite preimpregnation body or is compounded by the thermoplastic composite preimpregnation body and thermoplastic polymer through hot melting. The thermoplastic composite preimpregnation body is prepared by steps of steeping fabric prepared by reinforced fibers in thermoplastic polymer aqueous dispersion, drying and dehydrating, melting the polymer, cooling and shaping, and the length of the reinforced fibers is more than 2cm. According to the preparation method of the thermoplastic composite preimpregnation body, an organic solvent is not used, water is taken as a dispersion medium, the aqueous dispersion of polymer substitutes for the organic solvent, so that the preparation method is environment-friendly; the aqueous dispersion used by the preparation method has low viscosity and is beneficial to steeping of the polymer on fiber bundles, the immersion treatment is convenient, the production efficiency is high, the production cost is low, and the problem of effectively steeping the reinforced fiber fabric by the thermoplastic polymer is solved; compared with the composite board prepared by the prior art, the preimpregnation body plate is sharply improved in tensile strength and deformation performance.

The invention discloses a carbon fiber composite material with high compressive strength and a high-pressure draw ratio and a preparation method of the carbon fiber composite material with the high compressive strength and the high-pressure draw ratio, and belongs to the field of composite materials. The composite material comprises a resin matrix and reinforced fibers, wherein the reinforced fibers are carbon fibers of which the fiber monofilament diameters are 5.4 to 7.0 microns, the resin matrix comprises the following components in parts by mass: 100 parts of resin, 30 to 60 parts of a curing agent, 0.5 to 2 parts of an accelerator and 0.1 to 3 parts of inorganic nanoparticles. The composite material disclosed by the invention has excellent mechanical properties, especially the characteristics of high compressive strength and good pressure-tension balance, can be used for preparing main force-bearing structural parts of aerospace vehicles, and further can meet demands for the composite material with light weight, high strength, compressive strength and high-pressure draw ratio in the fields of high-speed rails, automotives and other industrial equipment.

The invention discloses a method for improving high temperature mechanical properties of a hollow turbine blade ceramic mold. According to the invention, a yttrium-aluminum garnet high temperature strengthening phase is synthesized from yttrium oxide and alumina through high temperature sintering, magnesium oxide is utilized at the same time for inhibiting growth of an alumina crystal grain under the condition of high temperature sintering, and titanium oxide is used for solution strengthening of alumina so as to improve high temperature strength of an alumina-based ceramic mold; finally, an yttrium chloride ion solution is used for dipping of the alumina-based ceramic mold to allow yttrium ions to be uniformly distributed in the alumina-based ceramic mold with a complex structure, so on the one hand, chloride ions are enabled to react with impurity Na and K ions in an alumina ceramic material to form sodium chloride and potassium chloride under high temperature sintering, thereby removing the Na element and the K element, and on the other hand, the yttrium ions are enabled to react with alumina under high temperature sintering for secondary formation of the yttrium-aluminum garnet high temperature strengthening phase. The method provided by the invention can be used for improving high temperature mechanical properties of a core-shell integrated alumina-based ceramic mold for a hollow turbine blade and improves a qualified rate of a directionally solidified high temperature alloy blade.

The invention discloses a continuous high pressure steeping device and a method, particularly to a continuous high pressure steeping device and a method suitable for industries of carbon, metallurgy and the like. A conveyer No. 4, a preheating chamber, a steeping tank, a cooling chamber, a conveyer No. 7 and a hooking and pulling machine are positioned on the same straight line and sequentially arranged in the continuous high pressure steeping device; trolleys No. 1, No. 2 and No. 3 are installed on a railway, and the trolleys No. 1, No. 2 and No. 3 and conveys, No. 1 No. 2, No. 3 and No. 4 are all provided with a pusher. The continuous high pressure steeping device and the method have the advantages and the effects that energy sources are effectively utilized, and the steeping efficiency is improved; the whole high pressure steeping process is continuously carried out, automated control is easy to realize, and the labor intensity of worker is lowered.

The invention discloses a lipophilic felt base cloth and a production method thereof. The production method comprises the following steps: successively carrying out crystallization and drying, screw extruding, melt filtering, spinning, cooling, drafting, wire placement and net pavement, needling reinforcement, hot rolling and chemical glue dipping and drying on polyester chips. Based on the totalweight of a glue solution, the glue solution for chemical glue dipping and drying comprises 6-8wt% of acrylate, 90-93wt% of water and 1-2wt% of a curing agent. The invention provides a production method of the brand-new lipophilic felt base cloth. According to the production method of the brand-new lipophilic felt base cloth, an acrylate solution which contains the curing agent is selected to be used as the glue solution to prepare the lipophilic felt base cloth, thus, the prepared lipophilic felt base cloth has good oil immersion property, and the problems that in a follow-up coiled materialproduction process, oil immersion uniformity of a coiled material is slightly poor, and the production efficiency is low are solved.

The invention discloses a Cf/Hf[x]Zr[1-x]C-SiC composite material and preparation methods thereof. The composite material comprises a carbon fiber fabricated part, an SiC substrate and an Hf[x]Zr[1-x]C substrate, wherein x is larger than 0 and smaller than 1, and the Hf[x]Zr[1-x]C substrate and the SiC substrate are uniformly filled in the holes of the carbon fiber fabricated part. One preparation method comprises the following steps that (1), a Cf/Hf[x]Zr[1-x]C blank is prepared; (2) the Cf/Hf[x]Zr[1-x]C-SiC composite material is prepared. The other preparation method comprises the following steps that (1), a Cf/Hf[x]Zr[1-x]C blank is prepared; (2) a Cf/Hf[x]Zr[1-x]C-C blank is prepared; (3) the Cf/Hf[x]Zr[1-x]C-SiC composite material is prepared. The Cf/Hf[x]Zr[1-x]C-SiC composite material has the advantages that the material is low in cost, ablative-resistant, excellent in mechanical property and oxidation resistance and the like, and at the same time, the preparation methods are simple, and the contents of the substrates are easy to control.