2834results about How to "Abundant raw materials" patented technology

The invention relates to a plant stress-resistant inducer, which takes Chitosan oligosaccharide solution as an effective active component. The invention adopts Chitosan oligosaccharide to induce crops to resist drought, waterlog, cold and freeze. Leaves of the crops are sprayed with the Chitosan oligosaccharide or roots of the crops are irrigated with the Chitosan oligosaccharide in order to induce the stress resistance (drought, waterlog, cold and freeze resistance) of the crops. By inducing the leaves of the crops, the content of resistant enzyme is increased in different degrees; the praline content is obviously increased; the opening degree of stomata obviously declines; the chlorophyll content is obviously increased; and the stress resistance of the crops is improved. The external application of the Chitosan oligosaccharide can improve the stress resistance of the crops, is free from toxicity, causes no environmental pollution, and is simple in usage.

The invention relates to a method for preparing a flexible and transparent conductive graphene membrane, belongs to the field of the science and technology of nanometer photoelectric materials and particularly relates to the preparation of a thermal reduction and oxidation graphene membrane at the temperature of 1,000 DEG C and technology for transferring the membrane onto a flexible substrate. The flexible and transparent conductive graphene membrane provided by the invention has the advantages of high electrical conductivity, high transmission of light, large-area preparation, rich raw materials, high material utilization ratio, simple preparation method, environmental protection and the like. The technology overcomes the defects of easy brittleness of the conventional indium tin oxide (ITO) and poor electrical conductivity of the conventional flexible conductive polymer membrane, is hopeful to prepare a novel flexible and transparent conductive membrane, is potentially applied to photoelectric functional apparatuses such as organic electroluminescent displays, organic electrical storages, organic solar cells and the like and is particularly applied to flexible photoelectric apparatuses.

The invention discloses a method for preparing a lithium iron phosphate nano composite microsphere for a lithium-ion secondary battery anode material by a hydrothermal method, which comprises the following steps: evenly mixing a lithium source, an iron source and a phosphoric acid source according to the stoichiometric ratio of 1-1.05:1:1 to prepare an aqueous solution with certain concentration, adding proper amount of reducing agent, carbonizing agent, ion dopant and the like into the aqueous solution, growing and curing crystals under high-temperature hydrothermal condition, removing a solvent from a hydrothermal product, and burning the hydrothermal product in inert or reducing atmosphere to obtain a final product. The lithium iron phosphate anode material prepared by the method has a regular nano composite microsphere structure, has a particle diameter of between 2 and 4 mu m, even distribution, tap density up to 1.3 to 1.6 g / cm, and has excellent cycle performance and multiplying power performance. The method has simple and easily-controlled process, can use cheap trivalent iron as the iron source, can obtain rich raw materials, and is a practical technique for preparing lithium iron phosphate.

The present invention relates to a rare earth-iron base compound magnetic refrigeration material with large magnetic entropy change and its preparation method. Its chemical general formula is La1-xRx(Fe1-yMy)13-zSizX alpha, in which R is more than one rare earth elements and its combination, M is more than one kind of Al, Co and Ga, etc. and its combination, X ix more than one kind of C, H, N andcombination of them, x is 0-0.4, y is 0-0.3, z is 0-3.0 and alpha is 0.3.0. Its preparation method includes the following steps: utilizing direct smelting and annealing treatment to can prepare La1-xRx(Fe1-yMy)13-zSiz and low C-content La1-xRx(Fe1-yMy)13-zSiz alpha gap compound, and utilizing smelting, quickly-quenching and annealing treatment to prepare high C-content La1-xRx(Re1-yMy)13-zSizC alpha gas compound.

The invention relates to a method for efficiently extracting lithium from salt lake brine. The method comprises the following steps: (1) forming an extraction organic phase by an extraction agent, a co-extraction agent and a diluent, and then mixing the extraction organic phase with salt lake brine according to the volume ratio of (3-4):2 for three-stage extraction with single extraction time being 2-10 minutes to obtain an organic phase; and (2) mixing the organic phase obtained in step (1) with a reverse extraction acid solution (0-1 mol / L) for three-stage reverse extraction with single reverse extraction time being 2-10 minutes, and collecting an aqueous phase which is an aqueous solution containing lithium ions. The co-extraction agent of an extraction system of the method is hydrophobic ionic liquid, compared with conventional synergist ferric trichloride, the interference caused by iron ions is avoided, the reverse extraction acidity is greatly reduced, more importantly the lithium-magnesium separation factor is significantly improved, and the elution step of magnesium ions is reduced; in addition, the method provided by the invention is easy in process, easy to control, high in operation reliability, and good in recyclability of the organic phase, and greatly reduces the production cost for extracting the lithium from the salt lake brine.

The invention discloses a composite catalytic electrode for producing oxygen by electrolyzing water, and a preparation method and application thereof. The electrode expression is Ni(OH)2 / Ni3S2 / Ni, wherein a Ni(OH)2 lamina is used as an outer layer coating layer, Ni3S2 nanoparticles are used as an active substance, and Ni foam is used as a conducting substrate. The preparation method comprises the following steps: carrying out ultrasonic cleaning on a metal nickel source sequentially with deionized water, alcohol and acetone; impregnating the pretreated metal nickel source in a sulfur source water solution, adding into a high-pressure autoclave, and carrying out hydrothermal reaction at 140-200 DEG C for 1-8 hours; and cooling, taking out the sulfurized metal nickel, rinsing with deionized water, and carrying out vacuum drying. The composite electrode for electrolyzing water has ultralow water electrolysis overpotential and high current density, obviously reduces the electric power consumption, and thus, has important application in the field of water electrolysis. Meanwhile, the composite electrode synthesis method is simple, has the advantage of low cost for raw materials and synthesis, and is suitable for application in water electrolysis industry.

The invention relates to a compound microbial organic fertilizer and a preparation method thereof. The compound microbial organic fertilizer is prepared from the following ingredients in parts by weight: 1-4 parts of trichoderma viride JUWEI002 fermentation liquor, 1-4 parts of bacillus subtilis JUWEI001 fermentation liquor, 20-30 parts of turfy soil, 33-38 parts of tobacco residue, 33-38 parts of silkworm faeces, 6-7 parts of calcium powder and 1-2 parts of potassium fulvate. The compound microbial organic fertilizer disclosed by the invention has the advantages that the quality of crops can be remarkably improved, the yield of the crops is increased, and the soil structure is improved.

The invention provides a method for preparing calcium oxide and sulfur by double-atmosphere fluidized roasting of desulfurated gypsum, belonging to the technical fields of solid pollutant treatment and in environmental protection chemical production. The method comprises the following steps: drying and dehydrating aged desulfurated gypsum, and then entering a multi-stage suspension heat exchangerfor pre-heating; entering hot-state gypsum into a circulating fluidized bed decomposition furnace, and introducing primary and secondary air for decomposition; cooling discharged hot-state calcium oxide, wherein cooled hot-state calcium oxide is used as a desulfurizer for later use; entering discharged smoke containing sulfur dioxide into the multi-stage suspension heat exchanger; removing calcium oxide dust in cooled hot smoke through multi-stage dust removing equipment; and feeding the smoke without the dust into a high-temperature-resistant high-efficiency filter for further removing the dust, and feeding clean smoke into a sulfur recovery system; and preparing the sulfur product by the processes of hot reduction, catalytic reduction, Clause reaction and the like, and feeding Clause tail gas into a coal burning boiler in a power plant for combustion. The method has the advantages of good environmental protection benefits and strong economic benefits.

The invention relates to the field of secondary batteries, in particular to phenolic resin-based hard carbon microspheres, a preparation method thereof, and a negative electrode material containing the microspheres. The phenolic resin-based hard carbon microspheres provided by the invention are spherical; d002 is 0.375 to 0.380 nm; the specific surface area is 70 to 350 m<2> / g; the pore volume is 0.08 to 0.18 cm<3> / g. The phenolic resin-based hard carbon microspheres provided by the invention have a small specific surface area, structural stability, large interlayer spacing and rich pore structures, and can be applied to the negative electrode material of a lithium-ion battery or a sodium-ion battery, so that the battery has high capacity and stable cycle performance.

The invention discloses a lost foam casting cast iron coating for preventing carbon defects, which comprises the following components by weight percent: 60.5%-64.5% of bauxite, 13.5-17.5% of kaolin, 3.5%-6.0% of talc powder, 1.7%-3.5% of attapulgite, 0.4%-0.8% of sodium lignosulphonate, 2.5%-6.0% of aluminum sulfate, 1.7%-3.5% of polyvinyl alcohol, 3.5%-5.0% of silica sol, 0.1%-0.2% of iron oxide powder and 0.01%-0.02% of n-octanol, and the sum of the components is 100%. The lost foam casting cast iron coating is prepared by respectively preparing water solution of the attapulgite, the polyvinyl alcohol and the aluminum sulfate, evenly mixing the bauxite, the kaolin, the talc powder and the iron oxide powder for preparing mixed powder material, mixing the water solution of the attapulgite, the polyvinyl alcohol and the aluminum sulfate, the silica sol and the refractory mixed powder material with the n-octanol, stirring and grinding. The coating has the advantages of good thixotropy, good coating property, high coating strength and good gas permeability; and the surface of a cast is smooth and has no wrinkles and other carbon defects.

A hybrid solar cell with an aluminum-doped zinc oxide nanorod as the electron transfer layer is composed of a transparent conducting glass substrate, the aluminum-doped zinc oxide nanorod electron transfer layer, a layered perovskite-like hybrid material CH3NH3PbX3(wherein X is Cl, or Br or I),2,2',7,7'-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene hole transfer layer and an Au metal back electrode layer, wherein all the parts form a laminated structure in sequence. The hybrid solar cell with the aluminum-doped zinc oxide nanorod as the electron transfer layer has the advantages that due to the fact that the aluminum-doped zinc oxide nanorod is used as the electron transfer layer in the hybrid solar cell, the specific surface area is large, electron-transport capacity is high, electron-hole combination is effectively restrained, and photoelectric conversion efficiency is high; the manufacturing method and technique are simple, reaction temperature is low, efficiency is high, raw materials are rich, cost is low, and environmental friendliness is achieved. The hybrid solar cell with the aluminum-doped zinc oxide nanorod as the electron transfer layer is suitable for industrialized large-scale production.

Provided is a hybrid solar cell with Cs mingling with ZnO as an electron transfer layer. The hybrid solar cell with the Cs mingling with the ZnO as the electron transfer layer is composed of a transparent conductive glass substrate, a Cs mingling with ZnO nanorod electron transfer layer, layered perovskite hybrid materials CH3NH3PbX3(wherein X is C1, Br or I), a 2, 2', 7 and 7'- four [N, N - two (four - methoxy phenyl) amidogen] - 9, 9' - spirobifluorene hole transport layer and an Au metal back electrode layer which sequentially form a layered structure in a combining mode. The hybrid solar cell with the Cs mingling with the ZnO as the electron transfer layer has the advantages that the Cs mingling with the ZnO as the electron transfer layer is used in the hybrid solar cell, compared with zinc oxide, 2-3 orders of magnitude of electronic transmission capacity are improved, the recombination of electron-hole is effectively constrained, and the photoelectric conversion efficiency is high; the preparing method of the hybrid solar cell is simple in process, low in reaction temperature, high in efficiency, rich in raw material, low in cost, environmentally friendly, free of pollution, and suitable for industrial mass production.

The present invention relates to the method of producing biochemical stalk fodder for farm animal and makes it possible to utilize crop stalk fully. The technological scheme is the production process including crushing stalk, pulping, chemical treating with acid, alkali and ammonia, puffing, steaming, mixing with wheat bran, corn powder, bean cake, fish meal, salt, water and grain enzyme and final anaerobic fermentation.

The invention relates to a process for treating heavy metal contaminated soil, and is used for restoring the heavy metal contaminated soil containing nickel, zinc, arsenic, lead and copper. The method comprises the following steps of: adding a pH regulator into the heavy metal contaminated soil to be restored; adding apatite and sulfides into the mixed heavy metal contaminated soil to be restored; adding a curing agent into the heavy metal contaminated soil to be restored; evenly stirring and standing; and continuously maintaining. According to the process, the pH regulator is added into the heavy metal contaminated soil, so that the pH value of the soil is increased, and preparations are made for the subsequent stabilization and solidification of the heavy metal pollution soil; then the apatite and the sulfides are added, so that the soil is stabilized effectively; and finally, the curing agent is added, so that the heavy metals in the soil are stabilized effectively, and therefore, the content of the heavy metals in the soil reaches the leaching standard.

The invention discloses a biomass coke compound fertilizer and a production method thereof, which belong to the technical field of fertilizers. The fertilizer is prepared from conventional chemical fertilizer and biomass coke and is granular, wherein the biomass coke accounts for 20 to 70 percent of the total mass of the fertilizer. The biomass coke is a solid product produced by a process of cracking a biological material (such as straws and the like) at the high temperature of between 300 and 700 DEG C under the anoxic condition, and has prominent characteristics of light texture and many pores. The compound fertilizer is conventional compound fertilizer containing N, P2O5 and K2O, and the content of the total nutrients is 15 to 30 percent. The production method for the biomass coke compound fertilizer comprises the following steps of: weighing the conventional chemical fertilizer according to different nutrient content and proportion, preparing the conventional chemical fertilizer into powder, adding biomass coke granules in a mass ratio, mixing the powder and the biomass coke granules uniformly, and performing granulation, collection and drying to form the granular biomass coke compound fertilizer. The biomass coke compound fertilizer has the advantages of rich raw materials, simple technology, good effect and the like, meanwhile, has certain carbon emission reduction capacity, and is suitable for large-scale production.

The invention discloses a sodion battery cathode material, which is an ion-doped carbon material, wherein the carbon material is from pyrolytic carbon of various organic matter materials; the prepared carbon material has the ion doping property and can provide a suitable sodion de-intercalation channel; and the sodion battery cathode material has reversible sodion de-intercalation performance and is very hopeful to become a sodion battery cathode material which is low in cost and environment-friendly.

The present invention relates to a ferromanganese modified straw active carbon adsorbent for As (III) adsorption, and applications thereof. The technical scheme comprises: preparing straw into straw active carbon, adding to nitric acid, carrying out an acidification treatment to obtain acidified straw active carbon, adding the acidified straw active carbon to a metal iron salt and HCl mixing solution, carrying out a reaction at a room temperature for 22-24 h, heating to a temperature of 95-105 DEG C, carrying out a reaction for 6-7 h to obtain iron modified active carbon, mixing a metal manganese salt and the iron modified active carbon, carrying out a reaction at a temperature of 75-85 DEG C, adding a KMnO4 and KOH mixing aqueous solution, carrying out a reflux reaction at a temperature of 75-85 DEG C, and washing he product so as to obtain the target product. According to the present invention, with the ferromanganese modified straw active carbon adsorbent, the As (III) can be selectively recovered from the solution containing the As (III) ions and the impurity metal ions; and the ferromanganese modified straw active carbon adsorbent has advantages of low cost, high selectivity, high adsorption capacity, and the like.

The present invention discloses a flexible printed manure-urine sensor, which comprises three parts such as a flexible film substrate 11, a printing electric conduction electrode 12 and a sensing area 13, wherein the flexible film substrate 11 adopted as a printing substrate is used for supporting the attachment of the electrode part of a sensor and a functional material, the printing electric conduction electrode 12 adopted as the electrode of the sensor is used for achieving a sensing function and transmitting an electrical signal, and the sensing area 13 is used for attaching the functional material, contacting the component in the manure-urine excreta, changing the electrical parameter, and converting into the electrical quantities capable of being sensed by the electrode. According to the present invention, the manure-urine sensor is printed on the flexible film substrate through the printing process, and the sensor has characteristics of simple structure, simple process, low cost, adequate sensitivity, and convenient and comfortable use, and can achieve the single-use and throwing after the use.

The invention discloses a prelithiated film and a preparation method and application thereof. The prelithiated film comprises 1um-50um of base film body and 0.02um-100um of prelithated layer coated onthe base film body; the prelithated layer comprises, by weight, 1wt%-99.99wt% of prelithiated material, 0wt%-98.99wt% of coating material, 0.01wt%-10wt% of binder, 0wt%-10wt% of conductive additive material, 0wt%-2wt% of dispersing agent and 0wt%-2wt% of assistant; the prelithiated material is the material capable of releasing lithium ions by an electrochemical reaction under voltage control; theprelithiated material especially comprises LixM1yOz, LixM2y (PO4)z, LixM2y (SiO4)z, Li2S and LixM1ySz; x, y and z are integers or non-integers and meet the balance of electrovalence of chemical formula; M1 is a combination or more of a metallic element, a transition metal element, a rare earth element, an alkali metal, an I VA group element; M2 is a combination or more of the metal element, the transition metal element, the rare earth element, the alkali metal, the I VA group element.

The invention relates to a method for preparing high-density spherical lithium iron phosphate for lithium ion power batteries, which is characterized by comprising the preparing processes: acid, a ferric iron resource and phosphor resource are mixed into mixed water solution; alkali is prepared into water solution; the mixed water solution and the alkali water solution are respectively and continuously introduced into a reaction kettle to carry out coprecipitation reaction, and a spherical iron phosphate precursor is synthesized; the precursor is used as a raw material and is evenly mixed with a lithium resource, a carbon resource and a doping metal compound, and then, the mixture is heated in a stove to obtain a spherical lithium iron phosphate powder material under a protective atmosphere. The spherical lithium iron phosphate powder material prepared by the method has freely controllable average grain diameter being from 4 microns to 15 microns, narrow distribution of the grain diameter tap density as higher as 1.4 g / cm<3> to 2.2 g / cm<3>, and has the characteristics of high specific capacity, rate discharge and good safety performance. The method has simple technical processes and is suitable for industrial mass production.

The invention provides a graphite-phase carbon nitride nanosheet-based compsite photocatalytic material as well as a preparation method and application thereof, which relates to the field of photocatalytic materials. A metal oxide semiconductor can uniformly cover the surface of a graphite-phase carbon nitride nanosheet by virtue of hydrolytic reaction and roasting of metal salts, so that the interaction between the graphite-phase carbon nitride nanosheet and metal oxide semiconductor interface can be adjusted. The interaction between the interfaces influences the transmission of charge carriers, the interface with close interaction can promote the charge transportation, so that the photocatalytic efficiency of the composite material can be improved. In the process that the metal oxide semiconductor is in-situ generated on the surface of carbon nitride, the blocky graphite-phase carbon nitride are converted into the graphite-phase carbon nitride nanosheet due to the heat etching effectin the calcining process, so that the specific surface area of a sample can be improved, the agglomeration of the particle-shaped oxide semiconductor particles can be prevented to certain extent, andthe metal oxide semiconductor can be uniformly dispersed on the surface of the graphite-phase carbon nitride nanosheet.

The invention relates to an expanded vitrified micro-bead fireproof thermal-insulation board and a preparation method thereof, belonging to the field of construction materials. In the invention, inorganic expanded vitrified micro-beads, which are used as main raw materials, are combined with an organic binder, molded in a die and sintered, so that the expanded vitrified micro-beads are bound to form a compact single-layer board; and meanwhile, in the sintering process, the content of organic matters in the thermal-insulation board is greatly reduced to further enhance the fire resistance of the fireproof thermal-insulation board, thereby obtaining the fireproof thermal-insulation board with favorable comprehensive properties. The preparation technique of the expanded vitrified micro-bead fireproof thermal-insulation board is simple; and the expanded vitrified micro-bead fireproof thermal-insulation board has the advantages of low coefficient of thermal conductivity, high strength, excellent fire resistance, low water absorptivity, favorable thermal insulation effect, long service life and low volume weight, and can not deform or deteriorate when being used for a long time, therebybeing a green, economical and environment-friendly fireproof thermal-insulation material.

A preparation method of nano-sized silicon and a silicon / carbon composite material is disclosed. A nano-sized silicon-containing by-product produced during the process of industrial smelting of metal silicon, silicon-iron alloy and the like is reduced directly by a metallothermic reduction process, so as to obtain a nano-sized silicon material; the nano-sized silicon material undergoes ball-milling along with a carbon material and / or is mixed with a carbon precursor; and through hydrothermal carbonization and solvent thermal treatment, pyrolysis carbonization, or chemical vapor deposition of carbon, the nano-sized silicon / carbon composite material is prepared. The nano-sized silicon and / or composite material can be used as an active negative material or used in an energy storage system. According to the preparation method, processes with disadvantages of tedious technology, complex equipment and energy consumption, such as removal of impurities in advance, nano-structuring and the like, are not required; raw material resources are rich, cheap and easily available; technology is simple; costs are low; and the method is easy for amplification.

The invention relates to a method for producing a biological particle grain-saving straw feed, effectively solving the problem of grain waste in the production of a biological particle straw feed so as to meet the need of stockbreeding on feeds. The method comprises the following steps of: firstly, mixing the raw materials in percentage by weight: 70-80 percent of straws, 17-27 percent of corn meal, 0.5-1 percent of ammonium bicarbonate, 0.2-0.4 percent of brown sugar, 0.5-1 percent of active biochemical bacterium and 0.4-0.6 percent of common salt; adding 45-55 percent by the raw material weight of water at 24-30 DEG C and uniformly stirring and mixing; and then, putting in a sterile workshop at 40-44 DEG C, carrying out anaerobic fermentation for 6-8 days, extruding to remove 30-40 percent of water content to form a fermented raw material and then granulating and air-drying. The method provided by the invention is simple, rich in raw materials and easy to produce, can fully utilize biological straws and save grains, has good feeding effect and remarkable economic and social benefits and therefore is a great innovation on the biological feed.

The invention relates to a preparing method for self-healing polysaccharide hydrogel. The preparing method comprises the steps that cellulose is added into ionic liquid to be dissolved, the mixture is then cooled to the room temperature, and a cellulose solution is obtained; the cellulose solution is heated and dripped with tert-butyl acetoacetate under the protection condition of introducing nitrogen, a reaction is carried out at the constant temperature, the solution is then cooled to the room temperature, purified and subjected to vacuum drying, and acetoacetic acid cellulose is obtained; under the room temperature, a chitosan solution is added into the acetoacetic acid cellulose solution, oscillated and mixed, and the self-healing polysaccharide hydrogel is obtained. The polysaccharide hydrogel prepared through the method has the self-healing performance, and has the pH responsiveness at the same time. The preparing method is simple in process, rich in raw material and suitable for modification of most polysaccharide derivatives; meanwhile, due to the good biocompatibility of cellulose and chitosan, the prepared polysaccharide hydrogel has good application prospects in the fields such as tissue engineering repair, medicine controlled release and biological bionics.

The invention discloses a preparing method of nanometer vanadium carbide powder, which is characterized by the following: dissolving raw material of powder-shaped ammonium vanadate, carbonaceous reducer and micro-dose rare earth as catalyst according to certain proportion in the deionized water or distilled water; stirring evenly; preparing solution; heating solution; drying; producing priority powder with vanadium source and carbon source; carbonizing priority powder in the high-temperature reactor protected by vacuum or gas for 30-60 min at 800-950 deg.c; obtaining vanadium carbide powder with even distributing grain (even grain is less than 100 nm).

The invention discloses a rechargeable magnesium battery taking oxygen-containing organic matter as a cathode material, and a preparation method of the rechargeable magnesium battery, wherein the oxygen-containing organic matter comprises the components of quinones, phenols, anhydrides derivatives and a compound containing nitro and oxygen radical. The battery and the method have the advantages of being simple in preparation technology, easy to process, environment-friendly and high in regeneration. The rechargeable magnesium battery prepared by the invention has the advantages of being relatively good in structural stability and circulation stability, rich in raw materials, safe in system and the like.

The invention belongs to the technical field of micro-nano optics, polarization optics and optical holographic, and discloses a polarization multiplexing holographic imaging method based on a transmission type all-medium metasurface. A response main wavelength <lambda> is determined; geometric parameters of a unit structure are determined; a GS phase recovery algorithm is adopted to obtain phase distribution of the unit structure responding to the main wavelength; the pixel point of each element is expanded into a 2*2 array by adopting a Dammann grating method, and the obtained each pixel unitcomprises information responding to horizontal polarized light and information responding to vertical polarized light; and a synthesized silicon nano-antenna array is irradiated by horizontal polarized light and vertical polarized light with the wavelength of <lambda>, and different holographic images are reconstructed. According to the method, phase modulation of 0-2 <pi> can be realized only bychanging the size of the short axis of the silicon nano-antenna, and an embossment phase modulation structure of any step number can be realized equivalently; and a simple process, high processing error tolerance and quite high stability and reliability are achieved.

The invention discloses a composite material coated with a SiC-Fe based alloy layer and a preparation method of the composite material. The composite material coated with the SiC-Fe based alloy layer is formed by coating the SiC-Fe based alloy layer on the surface of a steel base material, wherein the steel base material is carbon steel or alloy steel of which the carbon content is 0.2 to 0.7 weight percent, and the raw material of a SiC-Fe composite material layer is SiC powder and iron-based autolytic alloy powder. The preparation method of the composite material comprises the following steps of: mixing the iron-based autolytic alloy powder with the SiC powder; and spraying the mixture on the surface of the steel base material. The composite material coated with the SiC-Fe based alloy layer has excellent performances of high hardness, good wearing resistance, low brittleness, capability of being subjected to heat treatment and machining, low cost, high performance price ratio and the like, and can obviously improve the surface property of the steel base material.