17 results about "Powder" patented technology

The invention belongs to the technical field of concrete. The invention relates to recycled concrete and a preparation method thereof. The recycled concrete comprises the following raw materials in parts by weight: 150-200 parts of a recycled concrete aggregate, 400-450 parts of cement, 700-800 parts of sand, 1000-1100 parts of stones, 120-150 parts of mineral powder, 50-100 parts of fly ash, 3-7parts of an expanding agent, 5-10 parts of a tackifier, 4-8 parts of a water reducing agent and 150-200 parts of water. Concrete waste is subjected to crushing, hydrochloric acid solution soaking, sodium silicate solution soaking and polyvinyl alcohol solution soaking to prepare the recycled concrete aggregate, and gaps of the concrete waste are filled, so that the mechanical property of the recycled concrete aggregate is improved. The recycled concrete prepared in the invention has excellent mechanical properties, and is suitable for constructional engineering with high requirements on concrete.

The invention relates to a marking device and particularly relates to a marking device for construction of a construction site. A technical problem to be solved by the invention is to provide the marking device for construction of the construction site, which can automatically mark, and is good in marking effect and simple to operate. The line marking device for construction of the construction site comprises a supporting plate, wheels which are rotationally arranged on the periphery of the bottom of the supporting plate; a push handle which is arranged on one side of the top of the supporting plate; a material carrying frame which is arranged in the middle of the supporting plate; a discharging assembly which is arranged on the lower side of the material carrying frame; and a driving assembly which is arranged on one side of the bottom of the supporting plate. The marking device is advantaged in that lime powder is placed in the material carrying frame by people, then a push handle is pushed forwards, under transmission, a first clamping block and a material blocking plate can be driven to move backwards, and under the action of gravity, the lime powder can fall down to the ground, so people carry out ground marking work.

The invention belongs to the technical field of building materials, and particularly relates to an autoclaved aerated concrete block and a preparation method thereof. Waste wind power blade fibers used in the invention can inhibit and reduce the dry shrinkage of the autoclaved aerated concrete block, and avoid the problems of masonry cracking and the like caused by water absorption and large dry shrinkage of the block in the actual use process; and the characteristics of small particle size and high specific surface area of the waste wind power blade powder are fully utilized, the waste wind power blade powder is used for replacing fly ash, slag and other raw materials in conventional building block production raw materials, the micro aggregate filling effect of the waste wind power blade powder is exerted, and the mechanical property of the building block is enhanced.

The invention relates to a three-dimensional forming device and a three-dimensional forming method for powder. The three-dimensional forming device comprises a rigid substrate. A forming slot is formed in the rigid substrate, a Z-direction linear module is also arranged on the rigid base, the forming slot which is an annular forming slot is fixed to the rigid substrate through a turntable, the center of the annular forming slot and the rotating center of the turntable are superposed, and the turntable can drive the annular forming slot to rotate around the center of the turntable; a powder three-dimensional forming body is arranged in the annular forming slot, and a space between the powder three-dimensional forming body and the annular forming slot is filled with free powder; a cantileverbracket is arranged on a moving platform of the Z-direction linear module, a forming head assembly for constructing the powder three-dimensional forming body layer by layer is arranged at the tail end of the cantilever bracket, and the forming head assembly driven by the Z-direction linear module moves vertically and is positioned in the annular forming slot. The invention provides the high-efficiency three-dimensional forming device and three-dimensional forming method for powder, wherein the powder is not provided precisely layer by layer, no residual powder is generated in a powder pavinglink and selective formed parts can work continuously.

The invention discloses laser cladding coating powder and a preparation method. The laser cladding coating powder comprises the following compositions in percentage by mass: 97-99wt.% of iron-based composite powder (90% of Fe901 and 10% of WC) and 1-3 wt.% of CeO2 powder. The preparation method comprises the following steps: metallic matrix selection and pretreatment, powder matching and ball grinding, synchronous powder feeding, laser cladding, and generation of Fe-based composite coating taking Cr23C6 and WC as reinforcing phases on the surface of the metallic matrix. A laser cladding layeris excellently combined with the matrix and higher in hardness and has excellent oxidization resistance and high temperature wear resistance.

The invention discloses an in-situ synthesized Cr3C2 reinforced Ni-based composite material and a hot-press preparation method thereof. Cr2AlC (10-40 vol%) ceramic powder and Ni powder are used as rawmaterials. Under high temperature environment, Cr2AlC dissociates, Al atoms diffuse with part of Cr atoms, in-situ synthesized Cr3C2 ceramic particles are evenly distributed in a matrix, meanwhile, Cr atoms and Al atoms are dissolved in a Ni matrix to form gamma-Ni, and when Cr, Al reaches a certain amount, a precipitated phase Ni3(Al,Cr), that is, a gamma'phase is precipitated out. The masses ofthe Cr2AlC powder and the Ni powder are calculated and weighed, after ball milling and mixing, the Cr2AlC powder and the Ni powder are poured into a hot-press mold for hot-pressing sintering, the sintering temperature is 1,200-1,400 DEG C, 25MPa pressure is applied when the temperature is 1,100-1,200 DEG C, the insulation and pressure maintaining is performed for 30min, pressure relief is performed after the temperature is lowered to 500-600 DEG C due to furnace cooling, a sample is taken up when the temperature is lowered to below 80 DEG C, and the in-situ synthesized Cr3C2 reinforced Ni-based composite material is obtained. The material has comprehensive properties such as high strength, high hardness, wear resistance, corrosion resistance and good high temperature performance, and canbe applied to aerospace, military industry, transportation and other fields.

The invention relates to a preparation method of AlMgB14 ceramic material powder, comprising the following steps of: using absolute ethyl alcohol as a solvent, and carrying out ball-milling mixing onraw material powder to obtain mixed slurry, wherein the raw material powder comprises Al powder, MgB2 powder and boron powder in a mass ratio of 1: (1.2-1.4): (3.6-4.2); and drying and pre-pressing the mixed slurry to obtain a block, and sintering the block in a protective atmosphere.

The invention provides a method and a device for recycling SiO2 powder from tail gas. The tail gas SiO2 powder recovery device comprises a double-channel flue, an electrostatic dust collection net, a vibration dust remover, a wind speed detector, a flue baffle and a SiO2 powder collection pool, siO2 powder in the tail gas is recycled through an electrostatic dust collection method, and high-purity SiO2 powder is obtained. The method for recycling the SiO2 powder from the tail gas comprises the following steps: recycling the high-purity SiO2 powder from the tail gas by utilizing the tail gas SiO2 powder recycling device, and then pressing and solidifying the high-purity SiO2 powder at high temperature to form a transparent quartz glass body. By collecting high-purity SiO2 powder in the tail gas, the utilization rate of a silicon raw material is increased; the dust content in the tail gas is reduced, and the tail gas treatment difficulty and treatment cost are reduced; and the quartz glass produced by using the high-purity SiO2 powder is excellent in quality.

The invention belongs to the technical field of bridge deck pavement, and particularly relates to a gradient functional bridge deck pavement material and a preparation method thereof. The gradient functional bridge deck pavement material is prepared from the following components in parts by weight: 10 to 25 parts of pouring type asphalt cement, 75 to 90 parts of mineral aggregate, 1 to 2 parts ofsteel fiber and 0.4 to 1 part of additive, wherein the mineral aggregate comprises light aggregate, common aggregate and mineral powder, and the light aggregate accounts for 1-99% of the total mass ofthe mineral aggregate. The density difference between the light aggregate and the common aggregate and the cementing material is utilized, the paving top surface is enriched with the light aggregate,the effect of enhancing the interlayer shear resistance is achieved, the bottom surface is enriched with the common aggregate and the cementing material, and the deformation compliance is fully exerted. Meanwhile, the weight of the bridge deck pavement can be reduced by 10-60% under the condition that the thickness is not changed, or the pavement thickness can be increased by 1-3 cm under the condition that the dead load is not changed. Furthermore, the purposes of saving high-quality aggregate and protecting the environment can be achieved.

The invention belongs to the technical field of smelting, and discloses a metal material smelting device for metal material processing, which comprises a crushing bin; a fixed cylinder is mounted at the bottom end of the crushing bin; connecting pipes are fixedly connected to the two ends of the bottom of the fixed cylinder, and a smelting box is mounted between the bottom ends of the two connecting pipes; a controller is fixed to one side of the smelting box; a discharging pipe is installed on the portion, close to the lower portion of the controller, of one side of the smelting box; two crushing rollers which are meshed with each other are symmetrically connected to the interior of the crushing bin; and a motor is installed at the middle of the bottom of the fixed cylinder; Through cooperation of the fixed cylinder, a rotating cylinder, a second crushing block, a first crushing block and other structures, metal crushed aggregates can continuously fall down and be ground, so that the small metal crushed aggregates can be crushed into fine powder particles, the decomposition effect of the metal material is further improved, the melting time of the metal material is shorter, and the working efficiency is greatly improved.

The invention discloses a two-step sintering preparation method of doped bismuth ferrite-barium titanate-based leadless piezoelectric ceramic, and belongs to the field of leadless piezoelectric ceramic materials. The preparation method comprises the following steps: calculating and weighing according to a chemical formula (1-x) Bi < 1-y > M < y > Fe < 1-z > N < z > O < 3-x > BaTiO3, ball-milling and mixing, drying, sieving, putting into an aluminum oxide crucible, and pre-sintering at 780-950 DEG C for 2-12 hours to obtain pre-sintered powder; performing secondary ball milling, drying at 70-120 DEG C, sieving dried powder, adding 2wt% of polyvinyl alcohol, fully grinding and granulating, and putting the granulated powder into a mold for compression molding; and putting the ceramic blank into a muffle furnace, heating to 300-440 DEG C, discharging glue for 1-2 hours, heating to 950-1050 DEG C, preserving heat for 1-2 minutes, cooling to 900-1000 DEG C, sintering for 6-10 hours, and cooling to room temperature along with the furnace to prepare the required ceramic. According to the two-step sintering method, by ingeniously controlling the two-step sintering temperature and the heat preservation time, the generation temperature interval of an impure phase in the bismuth ferrite-barium titanate-based ceramic can be avoided, and the prepared ceramic is good in crystallinity, uniform in component, small in crystal grain, low in dielectric loss and excellent in insulativity and piezoelectric property.

The invention relates to a method for preparing carbonitride-silicide solid solution composite ceramic at a low temperature by a reaction hot pressing sintering technology, and belongs to the field of multiphase ceramic materials. The invention aims to solve the technical problems of poor sinterability and high-temperature performance of the existing multiphase ceramic. The method comprises the following steps: 1, mixing carbide powder, carbonitride powder and silicon powder, and carrying out ball milling to obtain composite powder; and 2, sintering the composite powder obtained in the step 1 to obtain the carbonitride-silicide solid solution composite ceramic. Fourth subgroup carbides and carbonitride capable of generating solid-phase exchange are selected, the solid-phase reaction and the solid-solution coupling synergistic process of original powder in the sintering process are fully utilized, an anion-cation dual solid solution or split-phase solid solution can be formed, and compared with a traditional means, the sintering temperature can be reduced by 300-500 DEG C. And the relatively low sintering temperature ensures that the material prepared by the method has a fine average grain size, and the strength and the hardness of the material are remarkably improved.

The invention relates to a rock stratum micro-disturbance continuous excavation method related to a similar physical model. The rock stratum micro-disturbance continuous excavation method comprises the steps of model building and excavation simulation. According to the method, mica powder is added, disturbance to the whole model during excavation is further reduced, the method can be applied to acontinuous excavation occasion, so that experiment errors are further reduced, the manufacturing number of the model is reduced, and thus experiment materials are saved; technical requirements on personnel during excavation are reduced; the excavation method is simpler to operate; consumption of materials is reduced; excavation precision is higher; and experimental design size is easy to realize.