36results about How to "Play a strengthening effect" patented technology

The invention discloses a preparation method of a carbon nanotube-alumina composite reinforced magnesium-based composite material, which relates to the manufacture of magnesium-based alloy by using a casting method. The preparation method comprises the steps of: step 1, calcining and reducing raw materials of ferric nitrate nonahydrate and alumina in the ratio of (0.07-1.00):1 to obtain an iron / alumina composite catalyst, and finally, performing catalytic pyrolysis reaction by using the mixed gas of nitrogen gas and ethylene in the volume ratio of (6-12):1 for uniformly dispersing carbon nanotubes on the surface of the alumina, so as to prepare a carbon nanotube-alumina composite reinforced phase; and step 2, adding the carbon nanotube-alumina composite reinforced phase to a molten magnesium base material, and stirring and casting to prepare the carbon nanotube-alumina composite reinforced magnesium-based composite material, wherein the added carbon nanotube-alumina composite reinforced phase accounts for 1-15% of the molten magnesium base material by mass percentage. According to the invention, the defect of a magnesium-based alloy texture in the magnesium-based composite material produced in the prior art is overcome, the excellent enhancing effect of the carbon nanotubes in a magnesium matrix can be brought into full play, and the comprehensive performance of the magnesium-based composite material is ensured to be enhanced.

The invention discloses an in-situ growth SiC nanowire modified SiC f The preparation method and application of SiC ceramic matrix composite materials, the preparation method is to place the graphite sheet containing metal coating and the carbon fiber preform together in a chemical vapor deposition furnace without contact, and deposit it on the carbon fiber preform by chemical vapor deposition In-situ growth of SiC nanowires on the pores and surfaces to obtain SiC fiber preforms with SiC nanowires, and then obtain SiC matrix by chemical vapor deposition, that is, SiC nanowires modified SiC f / SiC ceramic matrix composite material, the present invention introduces the metal catalyst indirectly, and the metal catalyst diffuses to the surface and internal pores of the SiC fiber preform in the gas phase, the catalyst distribution is more uniform, and the SiC nanowire density of the catalyzed growth is moderate. The resulting SiC nanowire-containing SiC f / SiC composite material, the maximum crushing load can reach 1175.0N, and SiC nanowire modified SiC in the prior art f Compared with the SiC ceramic matrix composite material, the obtained tubular SiC of the present invention f The crush performance of / SiC composite material is greatly improved.

The invention discloses an instant food containing five red foods and a preparation method, belongs to the technical field of agricultural product deep-processing. Small red beans, red dates without cores, peanuts with red skin, medlar and brown sugar are used as raw materials, wherein the instant food block dry product containing five red foods is obtained by soaking the small red beans, red dates without cores, peanuts with red skin and medlar, boiling, heat-preserving, adding brown sugar, boiling, cooling, applying on mode, quick freezing, and freezing drying in vacuum; and the technical advantage of the vacuum freeze drying technology for maintaining the effective ingredients such as nutrient ingredient, pharmacology effect and color, aroma and taste of each component is sufficiently utilized, each component can sufficiently play the self effect, the obtained product has the food therapeutic effect of tonifying Qi, cultivating blood, beautifying skin, delaying senility if being eaten often. The instant food block dry product containing five red foods produced by the invention is ruddy in color, convenient for carrying, rapid in rehydration, and ready to use by adding warm water or hot water; the color is ruddy and natural after rehydration, the aroma is strong, and the taste is sweet; and the instant food has excellent color, aroma and taste, and is convenient for eating and good in flavor.

The invention discloses a nickel toughening high-chromium cast iron self-protection overlaying flux-cored wire. The flux-cored wire uses a low-carbon steel strip as a cover, and comprises the following flux-cored components in percentage by mass: 55-65% of high carbon ferrochrome, 16-24% of nickel powder, 0.5-1% of 60-mesh graphite, 1-2% of 200-mesh graphite, 1-5% of 60-mesh ferroboron, 1-3% of 200-mesh ferroboron, 1-2% of 60-mesh aluminum magnesium alloy, 1-2% of 200-mesh aluminum magnesium alloy, 1-2% of 60-mesh manganese powder, 1-3% of 200-mesh manganese powder, and the balance iron powder; and the flux-cored powder is 50-56% of the total weight of the flux-cored wire. The flux-cored components with different particle sizes are added to the flux-cored wire to guarantee excellent welding process performance, and a proper amount of Ni is added in the flux-cored components to urge increment of austenite number in an overlaying alloy high-chromium cast iron hypereutectic structure matrix; and meanwhile, the solid solution strengthening effect of the matrix is obvious, an overlaying alloy is effectively toughened, the crack resistance is greatly improved, the welding process performance is excellent, the cladding efficiency is high, and the multilayer welding needs no slag removal.

A direct-boost double-fed switched reluctance generator converter system, which is composed of a battery, a main circuit, a charging and energy feeding circuit, a bidirectional isolator, and an output capacitor. The main circuit is composed of a phase circuit of each phase winding, and each phase circuit is mutually Parallel connection, the battery provides excitation, each phase circuit can realize the enhanced excitation effect of doubling the excitation voltage during excitation, and can directly realize that the voltage on the output side is significantly higher than the battery voltage on the input side, and at the same time solve the problem of output during the excitation phase of the switched reluctance generator. The problem that the continuous output current cannot be obtained on the side, and the battery participates in the output during the excitation phase, so that the power quality of the output side is higher; the charging and energy feeding circuit can automatically charge the battery in the forward direction, and can also reverse the battery power in extreme cases The output is to the load side, which improves the adaptability of the system; it is suitable for application in medium and high speed medium and small switched reluctance generator systems driven by various powers.

The invention provides a road heating mat for melting ice and snow and a pavement construction method thereof. The heating mat is arranged on an interface surface of an upper surface layer and a middle surface layer, is preformed by a heat insulation grid and heating cables, and can be divided into a straight mat and a bend mat according to the set shape of the heat insulation grid; the interlayer overall size occupancy rate and the field pavement power of the heating mat are utilized for synchronously adjusting the set parameters of the heat insulation grid, so that the interlayer stability can be effectively improved; the heating cables are arranged along grid bars of the heat insulation grid, so that the heat utilization ratio of the heating cables can be maximized. According to the construction method provided by the invention, through paving a rail, the heating mat can be effectively prevented from being crushed, pulled to be rolled up or pushed to slide so as to be damaged; through spraying emulsified asphalt for two times, fixing the heating mat through staple bolts, and setting the grinding times according to the interlayer overall size occupancy rate of the heating mat, the interlayer stability of the road requiring melting ice and snow can be effectively improved, the road damage is reduced, and the service life of the road requiring melting ice and snow is prolonged.

The invention relates to a 540MPa grade hot-rolled pickled steel plate and a manufacturing method thereof. The hot-rolled pickled steel plate comprises the following chemical components in percentageby mass: 0.15-0.25% of C, 0.01-0.06% of Si, 0.80-1.30% of Mn, 0.01-0.06% of Al, 0.015-0.050% of Nb, and / or 0.30-0.40% of Cr, less than 0.010% of P, less than 0.005% of S, and the balance Fe and inevitable impurities; and the final structure of the hot-rolled pickled steel plate comprises 55-65% by volume of ferrite, 30-40% by volume of pearlite, and 5-15% by volume of bainite. According to the 540MPa grade hot-rolled pickled steel plate, the components are optimized on the basis of the chemical components of a C-Mn series steel; the technical parameters of the rolling process, the cooling process and the pickling process are controlled, and thus the hot-rolled pickled steel plate of which the yield intensity is 440MPa or more, the tensile strength is at540MPa grade or more, and the longitudinal elongation A is not less than 26% can be obtained.

The invention discloses a high-strength and tough carbon nanotube-reinforced aluminum-based composite material with a non-uniform structure and a preparation method thereof, belonging to the technical field of composite material preparation. In the process of ball milling, pre-grind high-content carbon nanotube / aluminum composite material powder, then add low-content carbon nanotube / aluminum composite material powder for ball milling at regular intervals, and finally add aluminum alloy powder, thus in the cold Gradient change of carbon nanotube content formed in the micro-area of ​​composite material under welding action. In addition, due to the short ball milling time of the composite material powder added later, the degree of grain refinement is small, thereby forming a grain size gradient distribution of micro-domains. The powder is subjected to subsequent densification and secondary processing to obtain the final composite material, which exhibits much higher strength and toughness than the homogeneous structure composite material.