41results about How to "Reduce brittle fracture" patented technology

The present invention relates to the field of nano-composite materials, and specifically relates to a halloysite nanotube / epoxy nanocomposite. The halloysite nanotube is a branched polymine grafted halloysite nanotube; the branched polymine grafted weight halloysite nanotube and epoxy resin are in the weight ratio of 0.2-20:100, preferably 0.5-5:100. The hyperbranched polymine is grafted onto epoxidized HNTs, so that the branched structure has rich amino groups to generate stronger chemical bonds or hydrogen bonds between the halloysite nanotube and an epoxy matrix and to enhance the interface effect. The prepared modified halloysite nanotube can effectively improve the impact resistance of epoxy resin and reduce brittle fracture of epoxy resin, and has broad application prospects in the fields of automotive, electronics, functional materials and aerospace.

The invention discloses a mullite fiber preparation method which is efficient, rapid, environment-friendly and low in cost. The method includes: taking raw materials according to stoichiometric ratio of elements in the mullite fiber chemical formula, preparing colloid, performing fiber forming and drying for colloid discharging to obtain mullite non-crystal fiber, adding the fiber into a sagger made of wave permeable materials, placing the sagger in a special microwave oven, controlling heating rate by adjusting the microwave power under the air or oxygen atmosphere, heating to a heat treatment temperature, and cooling to the room temperature to obtain the mullite fiber. The mullite fiber prepared by the method is high in impurity and low in porosity, the grain size is about 30nm, and the fiber diameter ranges from 6 micrometers to 10 micrometers. Further, the mullite fiber is excellent in uniformity, brittle fracture and chalking of the fiber are greatly reduced, yield is increased, heat treatment temperature is lowered, heat insulation time is shortened, and production efficiency is greatly improved.

The invention relates to a high-temperature-resistant ceramic-based composite member and a connecting method thereof. The method comprises the following steps: (1) uniformly mixing silicon powder, chopped carbon fibers, an organic dispersing agent and a phenolic resin to obtain mixed slurry; (2) coating a joint face of a first to-be-connected prefabricated member and/or a second to-be-connected prefabricated member with the mixed slurry, and laminating and connecting the joint face of the first to-be-connected prefabricated member and the second to-be-connected prefabricated member so as to obtain a pre-connecting piece, wherein the first to-be-connected prefabricated member and/or the second to-be-connected prefabricated member are/is made from fiber preforms; (3) at least impregnating the joint of the pre-connecting piece with the mixed slurry, and sequentially curing and splitting the impregnated pre-connecting piece so as to obtain a pre-connected member; and (4) carrying out a silicon-zirconium alloy infiltration reaction on the pre-connected member, thereby obtaining the high-temperature-resistant ceramic-based composite member. The method disclosed by the invention has the advantages of being simple in process, capable of obviously enhancing the member connection strength and enabling the overall member to be high-temperature-resistant, and the like.

The invention discloses fibroin-containing anti-hair loss and hair-solidifying shampoo composition and a preparation method thereof. The shampoo composition is prepared from the following raw materialcomponents: 54.0-67.0 percent of deionized water, 14.0-18.0 percent of sodium laureth sulfate, 1.0-2.0 percent of glycol distearate, 1.0-3.0 percent of cocamide Methyl MEA, 0.1-0.5 percent of soapberry extract, 5.0-10.0 percent of water, 0.1-0.3 percent of guar hydroxypropyltrimonium chloride, 0.01-0.5 percent of EDTA-2Na, 0.01-0.1 percent of allantoin, 0.3-2.0 percent of polyquaternium-47, 1.0-3.0 percent of polydimethylsiloxane/laureth-23/sodium laureth sulfate, 1.0-3.0 percent of dimethiconol/TEA dodecylbenzenesulfonate, 2.0-5.0 percent of cocamidopropyl betaine, 3.0-5.0 percent of fibroinliquid, 0.1-1.0 percent of raw ginger extract, 0-10 percent of traditional Chinese medicinal extract, 0.1-1.0 percent of tea tree oil, 0.03-1.0 percent of citric acid and a proper amount of preservative. According to the fibroin-containing anti-hair loss and hair-solidifying shampoo composition, scalp and scalp microecology are reconstructed and protected through fibroin liquid, raw ginger extract, soapberry extract and the like so as to achieve the aims of restoring and solidifying hair and reinforcing hair toughness.

The invention discloses a reinforced steel-based surface-layer spatial-configuration composite containing rear earth and modified particles and a preparation method thereof, and belongs to the technical field of powder metallurgy and composite preparation. The composite is composed of a reinforced body and a base body; the reinforced body is mixed powder of rear earth powder, the reinforced particles and 45 steel metal powder, and the base body is mixed powder of rear earth powder and 45 steel metal powder, wherein the rear earth powder is yttrium powder or neodymium powder; the preparation method comprises the steps that ball-milling is conducted on the reinforced body powder and the base body powder; the base body powder is put into a lower die, and corresponding holes are formed by means of upper dies in different shapes and filled with the reinforced body powder; vibration and pre-bulking are conducted, then forming is conducted by means of SPS, and finally, the reinforced steel-based surface-layer spatial-configuration composite containing the rear earth and the modified particles is obtained through heating treatment. According to the composite and the preparation method thereof, the technology is simple, the cost is low, the evenness of distribution of the reinforced particles with the spatial configuration in the base body is good, the bonding strength is high, and thecomposite has good durability and capability of impact resistance, corrosion resistance and oxidation resistance.

The invention relates to a preparation method of a nano-wire reinforced SiC wear-resistant coating. A porous SiC nano-wire layer is prepared on the surface of a C/C (Carbon/Carbon) composite material, and the fracture toughness of the SiC coating is effectively improved by utilizing the super-high strength and elasticity modulus of the SiC nanometer and the good bonding force of the SiC nanometer with a SiC coating matrix, so that the high-temperature wear rate of the SiC coating is reduced, and the wear-resistance of the coating is enhanced. After the SiC nano-wire is added, the wear rate of the SiC coating at 800 DEG C is reduced to 1.83*10<-4>mm<3>.N<-1>.m<-1> from 1.51*10<-3>mm<3>.N<-1>.m<-1>, that is, the wear rate is reduced by one order of magnitudes.

The invention belongs to the technical field of low-alloy high-strength steel and particularly relates to a yield strength 690 MPa class steel plate capable of bearing high heat input welding and a manufacturing method of the yield strength 690 MPa class steel plate. The steel plate comprises chemical components including 0.01%-0.04% of C, 0.1%-0.3% of Si, 1.7%-2.2% of Mn, 0.01%-0.05% of Nb, 0.01%-0.05% of V, 0.005%-0.025% of Ti, 0.001%-0.008% of P, 0.001%-0.005% of S, 0.05%-0.5% of Cu, 0.05%-0.5% of Ni, 0.05%-0.5% of Cr, 0.05%-0.5% of Mo, 0.0005%-0.0025% of B, 0.001%-0.005% of N, 0.00002%-0.0002% of H, 0.001%-0.005% of O 0.001%-0.015% of Al, one of Mg and Ca and the balance Fe. Ti-Mg-O or Ti-Ca-O compound occluded foreign substances accounts for 10% or higher in occluded foreign substances with the size being 0.2 micron to 3 microns, and in addition, an average of 1%-50% of Ti is contained; and the number of the occluded foreign substances with the size being 3 microns or higher in the steel plate is smaller than or equal to 120 pieces/mm<3>. An LD-RH-LF-RH smelting process is adopted, and when oxygen in molten steel is fixed to be 150 ppm to 300 ppm, Ti and Mg or Ca are added; and two-stage controlled rolling and controlled cooling are adopted. The steel plate has good toughness performance and can bear 100 kJ/cm to 200 kJ/cm high heat input welding.

The invention provides a preparation method of a SiC fiber prepreg tape with an attached interface layer. The preparation method comprises the following steps of introducing a continuous silicon carbide fiber bundle onto a tension pulley after being unwound through a godet roller and a guide wheel, sending the continuous silicon carbide fiber bundle straightly into a desizing device to expand thecontinuous silicon carbide fiber bundle; introducing the continuous silicon carbide fiber bundle onto a gluing device, so that glue fully infiltrates the continuous silicon carbide fiber, after that,introducing the continuous silicon carbide fiber bundle to a silk spreading device, and fully spreading and sizing the continuous silicon carbide fiber bundle by a drawing-in roller in the silk spreading device; and enabling the fully spread and sized continuous silicon carbide fiber bundle to enter a winding roller to obtain the flat and uniform prepreg tape. The prepreg tape prepared by the invention not only can greatly improve the toughness of the silicon carbide fiber, but also a deposited interface layer is uniform, meanwhile, the overlapped parts of two adjacent fiber bundles in the prepreg tape are few, the fiber bundle is good in flatness and thin in thickness, in addition, the preparation equipment can control parameters in real time, and full automation and complete controllability can be realized.

The invention relates to a rotary joint, in particular to a connecting sealing member for conveying a fluid medium from a static pipeline to a swinging or rotating device, and belongs to the technical field of sealing devices. According to the technical scheme, the rotary joint with a temperature difference zone structure comprises a shell, a cylindrical spring mounted at the inner bottom of the shell and an outer tube positioned in the shell. A cylindrical ring is embedded on the end surface of the cylindrical spring; the outer tube is mounted in the inner hole of the cylindrical ring; and an O-shaped sealing ring is arranged in an inner hole at the tail part of the outer tube. The invention has the advantages of artistic and smooth outer appearance, stable rotation of the outer tube, temperature difference zone structure, reliable compensation on seal abrasion, good sealing performance and long service life.

The invention discloses a copper-silicon alloy material, an electroslag remelting preparation method thereof and a copper-silicon alloy wire material, and belongs to the technical field of non-ferrousalloys. The copper-silicon alloy material is prepared by an electroslag remelting process. The copper-silicon alloy material comprises the chemical compositions of 1.85-2.65% of Si, 0.6-1.0% of Mn, 0.2-0.3% of Ni, 0.08-0.2% of Ag, and the balance Cu. In the preparation process, a CaF2-NaF binary slag system with a high purity NaF is used, wherein the content of the high purity NaF is 25.5-28wt. %. A copper-silicon alloy ingot is rolled and wiredrawn to obtain the copper-silicon alloy wire material with excellent tensile properties. The wire material has good folding resistance, good fusing property and stable resistivity.

The invention discloses a production process of a rapid-absorbing fabric. The production process comprises the following steps of product design, spooling, warping, sizing, threading and weaving. Theproduction process achieves a higher level of comfort, shape retention and rapid perspiration performance of the fabric by blending and interweaving three fibers of cool plus fiber, cotton and hemp fiber, and achieves complementary advantages in performance.

The invention relates to the field of medicinal preparation, and especially relates to a pellet type sustained-release tablet and a preparation method thereof. The pellet type sustained-release tablet comprises metoprolol salts and felodipine. The preparation method can reduce the happening rate of rupture of the coating membrane of metroprolol succinate sustained-release pellets during the tablet compressing process; thus the release degrees of metoprolol are very similar before and after the tablet compressing; and compared with the preparations on the market, the release degree of metoprolol can be well repeated. The pellet type sustained-release tablet can simultaneously release metoprolol and felodipine for 24 hours in a sustained-release mode.

The invention discloses high-temperature-resistant antistatic modified polyamide and a preparation method thereof. The preparation method comprises the following steps: S1, uniformly mixing chlorobenzyl trichlorosilane, anhydrous toluene and anhydrous pyridine to obtain a mixed solution, and adding dried glass fibers into the mixed solution to obtain glass fibers A; s2, adding octadecyl dimethyl tertiary amine into trichloromethane, stirring and dispersing the component, and adding the glass fiber A to obtain a material A; s3, adding 3,4-vinyl dioxythiophene into the sulfonate solution, and stirring to obtain a material B; and S4, melting polyamide, sequentially adding the material A and the material B into the polyamide melt, then adding an antioxidant, a flexibilizer and water, and performing stirring and extrusive granulation to obtain the modified polyamide. The polyamide material prepared by the invention is good in mechanical property, high in thermal stability, good in antistatic property and antibacterial property, low in cost, simple in reaction principle, mild in condition, outstanding in comprehensive performance and relatively good in application prospect, and components such as an antistatic agent and a bacteriostatic agent do not need to be additionally added.

The invention relates to a pure cotton high count and high density compact spinning sized yarn production method. The method comprises the following steps that 1, the prepulp moisture regain of yarn is controlled to be 25-35%; 2, the yarn is subjected to sizing treatment, drying treatment and dry lease treatment in sequence, the vehicle speed of a sizing machine is 35-60 m/min, when the yarn is subjected to drying treatment, the moisture regain of the yarn is controlled to be 7-9%, the drying temperature is controlled to be 60-90 DEG C, and the yarn tension is controlled to be 350-650 N; 3, the yarn is subjected to waxing treatment and take-up treatment in sequence. According to the compact spinning sizing technology, the problem that brittle fracture is likely to occur, and then the weaving efficiency is low is effectively solved, and the warp beam quality and weaving efficiency are significantly improved.

The invention discloses a lightweight expanded perlite external wall heat insulation plate. The lightweight expanded perlite external wall heat insulation plate is prepared from, by weight, 100-120 parts of pretreated expanded perlite, 20-30 parts of flax fibers, 20-40 parts of aluminum oxide fibers, 10-20 parts of carbon nanotubes, 10-20 parts of gypsum powder, 8-16 parts of expanded vermiculitepowder, 8-16 parts of barite sand, 8-16 parts of coal ash, 7-10 parts of waste brick powder, 6-14 parts of calcium carbonate and 15-25 parts of basalt fibers. The pretreated expanded perlite is prepared by steps: mixing expanded perlite, xanthan gum and absolute ethyl alcohol, heating, stirring, adding hydrogen peroxide solution, stirring, adjusting a system pH value to 8.2-9, keeping the temperature, cooling, adjusting system pH to neutral, filtering, washing and drying to obtain the pretreated expanded perlite. The lightweight expanded perlite external wall heat insulation plate is low in density, effective in heat insulation and excellent in pressure resistance, and thickness is effectively reduced on the basis that strength is guaranteed.