253 results about "Hardening effect" patented technology

A method for preparing preserved kiwi fruit by vacuum freeze drying. The method comprises steps of: peeling and slicing kiwi fruit, immersing the kiwi fruit in color protecting liquid, and then placing the kiwi fruit in a hardening liquid for hardening; after hardening, conducting an ultrasonic pretreatment in liquid glucose; and then successively carrying out vacuum sugar permeability, prefreezing, vacuum freeze drying, and packing to obtain the preserved kiwi fruit. According to the present invention, glucose lactone is added into a calcium chloride hardening liquid to coagulate protein in the fruit pieces and significantly improve hardening effect. The ultrasonic pretreatment and vacuum sugar permeability avoid a heat treatment process of rapid heating for a long time or short time, so that the kiwi fruit slices are still bright green (quite similar with an original fruit color). Vacuum freeze drying on the kiwi fruit realizes a high nutrient conservation rate.

The invention relates to a heat treatment technology for pearlite steel rail hardening. The heat treatment technology for pearlite steel rail hardening is characterized in that a steel rail is heated to 880 DEG C to 920 DEG C, the temperature is kept for 10 minutes to 15 minutes, according to the different types of steel, the temperature is decreased to be within the specific temperature interval according to the specific cooling speed range and is kept for 30 seconds, and air cooling is conducted; the air cooling includes the specific steps that according to the pearlite steel rail hardening process system adopting a U75 V material, the temperature ranging from 880 DEG C to 920 DEG C is kept for 10 minutes to 15 minutes, the temperature is decreased to 570 DEG C to 600 DEG C with the cooling speed being 8 DEG C / s to 15 DEG C / s, and then the temperature is decreased to 20 DEG C to 25 DEG C with the cooling speed being 0.2 DEG C / s to 0.5 DEG C / s in an air cooling manner; and according to the pearlite steel rail hardening process system adopting a U76 CrRE material, the temperature ranging from 850 DEG C to 900 DEG C is kept for 10 minutes to 15 minutes, the temperature is decreased to 590 DEG C to 610 DEG C with the cooling speed being 6 DEG C / s to 10 DEG C / s, and then the temperature is decreased to 20 DEG C to 25 DEG C with the cooling speed being 0.2 DEG C / s to 0.5 DEG C / s in an air cooling manner. The heat treatment technology has the advantages that the specific hardening heat treatment technology of steel rails made of certain specific components is standardized, operability is high, optimum matching of the hardening heat treatment technology and the components of the steel rails is achieved, and the hardening effect of the steel rails is achieved.

The invention provides an alkali-free liquid accelerator and a preparation method thereof and belongs to the technical field of concrete admixtures. The alkali-free liquid accelerator is prepared fromthe following raw materials: aluminum sulfate, ferrous sulfate, sodium fluoride, magnesium fluosilicate, precipitated hydrated magnesium silicate, diethanol amine and water. The alkali-free liquid accelerator has a good rapid hardening effect, can effectively shorten the coagulating and final setting time of concrete, and effectively improves the early strength and the later strength of concrete.The preparation method of the alkali-free liquid accelerator comprises the following steps: stirring water and precipitated hydrated magnesium silicate for 15-20 min at 40 DEG C; then adding ferroussulfate and sodium fluoride, and performing mixing and stirring for 8-15 min; after that, adding aluminum sulfate; performing heating up to 75-85 DEG C; after a reaction for 1 h, adding magnesium fluosilicate, and performing stirring for 20-40 min; and at last, adding diethanol amine, performing stirring for 18-25 min to prepare the alkali-free liquid accelerator. The preparation method is simple,the reaction is safe, and the prepared accelerator has good dispersibility.

Methods and systems using a numerical model to describe polymeric material properties are disclosed. FEM model of a product is defined. FEM model includes one or more solid elements of polymeric material. In a time-marching simulation of the product under loads, stress state of the solid elements is calculated from deformation gradient tensors. Stress state incorporates the Mullins effect and strain hardening effect, also includes elastic stress, viscoelastic stress and back stress. A yield surface is defined to determine whether the elements are under plastic deformation. Plastic strain is obtained to update the deformation gradient tensor, which is then used to recalculate the stress state. Calculations continue until updated stress state is within a tolerance of the yield surface, at which time the results of polymeric material elements are obtained. The numerical model takes into account all characteristics of a polymeric material.

The invention relates to a machining process of a large duplex stainless steel impeller. The machining process comprises the steps of casting, thermal treatment of a front deformation protector, solutionizing treatment, finishing and rough polishing, component re-inspection, mechanical property inspection, RT radiographic inspection, defect treatment, repair welding and rough polishing, rough machining, trimming, stress relief thermal treatment, semi-finish machining, fine polishing, finish machining, balance test duplicate removal and the like. The machining process is small in hardening effect, small in dimension deformation, good in impeller machining dimension accuracy and high in surface smoothness. The work completion size inspection is controlled at the temperature lower than 40 DEG C. In addition, the processing efficiency is high, the quality is good, the dimensional accuracy and the position dimension tolerance deformation of the impeller can be ensured to be small, and the graph dimension requirement and the technical requirements can be met.

The invention provides a magnesium alloy sheet forming property improving method based on twinning deformation, and belongs to the field of nonferrous metal plastic working. By means of the magnesium alloy sheet forming property improving method based on twinning deformation, compression deforming in a plane is conducted on a magnesium alloy sheet, a stretching twinning deformation mechanism is activated, the basal texture of the sheet is changed, and the forming property of the sheet is improved. The method comprises the following steps that 1, a plane strain mold or a mold preventing instability of compression in the plane is prepared; 2, compression deforming in the plane is conducted on the magnesium alloy sheet through the mold; 3, a pre-deformed sheet material is subjected to annealing treatment, a strain hardening effect is eliminated, and therefore a magnesium alloy sheet with improved forming property is obtained. The basal texture of the magnesium alloy sheet which is processed through the method is remarkably changed, the forming property is substantially improved, and reliable guarantee is provided for subsequent deep processing of magnesium alloy sheets.

The invention discloses an Al-Mg-Si aluminum alloy material. The Al-Mg-Si aluminum alloy material comprises the following chemical elements in mass percentage: Mg of which the mass percentage is equal to or larger than 0.5% and equal to or smaller than 1.0%, Si of which the mass percentage is equal to or larger than 0.6% and equal to or smaller than 1.5%, Sn of which the mass percentage is equal to or larger than 0.02% and equal to or smaller than 0.2%, Mn of which the mass percentage is equal to or larger than 0.1% and equal to or smaller than 0.45%, Fe of which the mass percentage is larger than 0 and equal to or smaller than 0.4%, Ti of which the mass percentage is equal to or larger than 0.02% and equal to or smaller than 0.1%, Zn of which the mass percentage is equal to or smaller than 0.15%, Cr of which the mass percentage is equal to or smaller than 0.1%, and the balance of Al and other inevitable impurities; in addition, the requirement that the total mass percentage of the Mg and the Si is equal to or smaller than 2.0% is met. In addition, the invention further discloses an aluminum alloy plate made from the Al-Mg-Si aluminum alloy material, and a preparation method of the aluminum alloy plate. The aluminum alloy material disclosed by the invention not only has an excellent forming property, but also has a preferable bake hardening effect.

The invention belongs to the technical field of chemical synthesis, and in particular discloses a preparation method of silicon dioxide modified polyether polyol. The preparation method comprises the steps of diluting water glass, adjusting pH to be 4-7, and adding a compound S and polyether polyol for reacting, thus obtaining the silicon dioxide modified polyether polyol, wherein a chemical formula of the compound S is (R-O)n-SiXm, R is the alkyl of C1-C20, X is any substituent group, n is 1, 2 or 3, and n plus m is equal to 4. An inorganic matter silicon dioxide is introduced into the polyether polyol, the prepared silicon dioxide modified polyether polyol has a reinforcing and hardening effect on a polyurethane material, and the use amount of isocyanate in the polyurethane material can be reduced; the size of particles in the silicon dioxide modified polyether polyol is 10 nanometers to 10 micrometers, so that the possibility that the local performance defect of a polyurethane product occurs due to uneven filler distribution is reduced.

The invention belongs to the technical field of stabilizers and particularly relates to a soil stabilizer and a preparation method thereof. The soil stabilizer mainly comprises 2-acrylamido-2-methylpropane sulfonic acid, polyacrylamide, sodium sulfate, calcium phosphate, a polysaccharide, sodium lignosulfonate, sodium silicate, sodium hydroxide and water. The formulation of the soil stabilizer provided by the invention is reasonable and scientific in matching and may effectively shorten stabilizing time of soil and enhance soil stabilizing and hardening effects, and experiments show that a solid brick obtained by stabilizing may be as hard as and even harder than a red brick, has waterproof performance also meeting the waterproof standards of red bricks and is an ideal soil stabilizer.

The invention relates to an ultrahard waterproof membrane and a processing technology of the ultrahard waterproof membrane. The ultrahard waterproof membrane sequentially comprises an optical glass lens (1), an antireflection membrane layer (2), a combination layer (3), a waterproof hardening layer (4) and an air layer (5) from bottom to top. The ultrahard waterproof membrane is characterized in that the antireflection membrane layer (2) is sequentially composed of first-layer high-medium refractive index membrane materials, second-layer medium-high refractive index membrane materials, third-layer high-medium refractive index membrane materials and fourth-layer medium-high refractive index membrane materials. According to the ultrahard waterproof membrane and the processing technology, mixed design of the multiple kinds of the membrane materials is adopted in membrane system design, the waterproof membrane materials and the antireflection membrane layer are well combined, and plated curves have the ultralow reflectivity; meanwhile, an electronic beam evaporation waterproof drug device is adopted in the evaporation technology, the membrane layer is firm and even, the produced ultrahard waterproof membrane has the waterproof, dustproof and hardening effect, and the low reflectivity is achieved.