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732results about How to "High bonding strength" patented technology

Method for preparing silicon carbide coating on graphite surface

ActiveCN102850087AAvoid thermal mismatchHigh bonding strengthChemical vaporsCoating
The invention discloses a method for preparing a silicon carbide coating on a graphite surface. The method includes, firstly, placing a graphite crucible containing solid silicone materials in a high temperature graphitizing furnace and placing a graphite base body on a graphite support in the graphite crucible to generate a silicon carbide coating by means of direct reaction of silicon steam and carbon on the surface of the graphite base body; and secondly, placing the graphite base body which generates the silicon carbide coating on the surface in a chemical vapor deposition (CVD) furnace to be pyrolyzed on the surface of the silicon carbide coating which is located on the surface of the graphite base body to generate a CVD silicon carbide coating. According to the method for preparing the silicon carbide coating on the graphite surface, by means of the direct reaction of the silicon steam formed by heating the solid silicone materials and the carbon on the surface of the graphite base body, an in-situ formed chemical vapor reaction (CVR) silicon carbide coating is firmly combined on the graphite base body so that combination intensity is improved; and then a CVD process is used for pyrolyzing the CVR silicon carbide coating at high temperatures on the CVD silicon carbide coating so that pore space of the CVR silicon carbide coating is effectively filled, and combination strength is improved.
Owner:XIAN CHAOMA SCI TECH

Multi-core core-shell-structure silicon carbon composite negative pole material and preparation method thereof

The invention relates to a multi-core core-shell-structure silicon carbon composite negative pole material and a preparation method thereof. The preparation method comprises the following steps: 1. preparation method of high-dispersivity multi-core porous spheres; 2. preparation of high-dispersivity asphalt suspension; and 3. preparation of multi-core core-shell-structure silicon carbon composite negative pole material: adding the porous spheres prepared in the step 1 into the high-dispersivity asphalt suspension prepared in the step 2, carrying out ultrasonic dispersion, heating and drying by distillation while intensely stirring to remove the solvent, transferring the powder particles into a protective atmosphere, and holding at low temperature so that the asphalt liquid enters the inside of the porous spheres to enhance the binding strength between the silicon source and the conducting carbon mesh, carry out secondary coating on the silicon source, overcome the defects in the coating in the step 1 and enhance the capacity performance of the silicon; and carrying out high-heat treatment. The invention is simple and easy to implement, and has the advantage of high practicality. The prepared silicon carbon composite material has the advantages of high reversible capacity, designable capacity, favorable cycle performance, favorable heavy-current discharge capacity, high tap density and the like.
Owner:CENT SOUTH UNIV

Method for preparing Al-Al2O3 composite coating on surface of magnesium alloy

The invention relates to a method for preparing an Al-Al2O3 composite coating on the surface of magnesium alloy, belonging to the technical field of metal surface treatment. The Al/Al2O3 composite coating prepared on the surface of the magnesium alloy by a calorization-oxidation method has high corrosion resistance and rigidity. The method comprises the following main steps of: firstly, coating an aluminum coating to the magnesium alloy, and then electrochemically oxidizing the aluminum coating to form an aluminum oxide film layer having extremely high corrosion resistance and rigidity, wherein a cold spraying method or a molten-salt aluminum electroplating method is used in the preparation process of the aluminum coating of the magnesium alloy, and common anodic oxidization and plasma anodic oxidization are used for the oxidation of the aluminum coating. By coating the aluminum coating to the surface of the magnesium alloy to carry out calorization treatment and then carrying out electrochemical anodic oxidization, the invention enhances the comprehensive protective performance of the surface of the magnesium alloy, and the Al/Al2O3 composite coating prepared on the surface of the magnesium alloy has the advantages of large bonding strength, high rigidity, good corrosion resistance and the like, thereby being the ideal protective coating for the magnesium alloy.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI

Method for preparing ceramic particle enhanced steel-base composite material cast by evaporative pattern casting die

InactiveCN102489686AHigh bonding strengthImproved dimensional accuracy and surface qualityFoundry mouldsFoundry coresCoalCeramic particle
The invention provides a method for preparing a ceramic particle enhanced steel-base composite material cast by an evaporative pattern casting die. The method comprises the following steps of: uniformly mixing hard ceramic particles and aged foam beads according to any proportion, and filling the mixture into a curing die cavity of the die for curing to manufacture a foam die in which enhancement bodies are uniformly distributed; and then shaping according to the conventional evaporative pattern casting method, putting the obtained foam die into the cavity, smelting a base metal material to pouring temperature, pouring the base metal material into the cavity, cooling and solidifying the base metal material at room temperature, and clearing sand away from the base metal material to obtain the ceramic particle enhanced steel-base composite material, of which the hard ceramic particles are dispersed in the base metal. The preparation method is easy to operate, high in whole performance and high in yield rate; furthermore, in spite of whole enhancement and partial enhancement, various metal-base composite material parts can be directly made without secondary processing; the method is suitable for large-scale industrial production, and can be widely applied to anti-abrasion fields, such as mines, power, metallurgy, coals, building materials and the like.
Owner:KUNMING UNIV OF SCI & TECH

Metal composite plate rolling technique based on corrugated surface combining type blank forming

InactiveCN105127198AHigh bonding strengthSolve the problem of plate shape with large residual stress and serious driftAuxillary arrangementsMetal rolling arrangementsCrazingDissimilar metal
The invention discloses a metal composite plate rolling technique based on corrugated surface combining type blank forming and belongs to the technical field of machining of materials of metal composite plate strips. The metal composite plate rolling technique comprises the following steps that a metal base plate and a doubling plate are selected, arc-shaped base plate ripples and arc-shaped doubling plate ripples matched with the arc-shaped base plate ripples are rolled on the combined surfaces of the base plate and the doubling plate respectively, the section of each arc-shaped toothed ripple is in the shape of an arc or an elliptic arc or a sine wave, the height of each arc-shaped ripple is s, the width of each arc-shaped ripple is t, the thickness of the doubling plate is h, s/h=0.01-0.9, and t=(10-20)s; the base plate and the doubling plate are cleaned and stacked together, the base plate ripples and the doubling plate ripples are engaged, blank forming is conducted, and a composite plate blank comprises a double-layer metal composite plate blank or a three-layer metal composite plate blank or a four-layer metal composite plate blank; and a composite plate strip is obtained through rolling. By the adoption of the metal composite plate rolling technique, the technical problems that when a dissimilar metal composite plate is produced, the binding performance of a combined interface is poor, and bending, cracks and large residual stress occur are solved, the combining efficiency is high, and the binding strength is improved essentially.
Owner:TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Metal and plastic composite self-lubricating material and preparation method thereof

The invention discloses a metal and plastic composite self-lubricating material and a preparation method thereof. The metal and plastic composite self-lubricating material comprises a metal layer, a plastic binding layer and a plastic working layer, wherein the plastic binding layer binds the metal layer and the plastic working layer together through a chemical bond of a molecule; one part of theplastic working layer is embedded in a drop pit of the metal layer; the plastic working layer includes the material components according to the mass percent as follows: 60-90 of polyether-ether-ketone, 5-20 of polyfluortetraethylene, 7 of graphite, 1 of MoS2 and 5-10 of aluminium oxide; and the plastic binding layer includes the material components according to the mass percent as follows: 70-90 of polyether-ether-ketone, 5-20 of polyphenyl thioether and 5-10 of aluminium oxide. By adding the plastic binding layer between the metal layer and the plastic working layer, the invention further improves the binding strength of metal and plastic, has favorable heat resistance and resistance to chemical corrosion, no environment pollution, low noise and energy saving; in addition, the usage temperature is -60 DEG C to 250 DEG C, the friction coefficient is 0.08-0.32 and the wear rate is 0.8-3.5*10<-6>mm<3>/N. m.
Owner:JIANGSU UNIV

Fluoropolymer coating solution and weather-resistant coating obtained therefrom

InactiveCN102838906AHas a high fluorocarbon contentHigh bonding strengthCoatingsBonding strengthSemiconductor
The invention relates to a fluoropolymer coating solution and a weather-resistant coating obtained therefrom. Fluoroplastics have excellent dielectric property and chemical corrosion resistance, high and low temperature resistance, and other excellent weatherability. At the same time, fluoroplastics also have the properties of waterproofness, no stickness, low friction coefficient, and good self-lubricating performance, etc. Currently, fluoroplastics are widely used in chemicals, electronics, electrical engineering, aviation, aerospace, semiconductors, machinery, textiles, construction, medicines, automobiles and other industrial fields. However, due to the intrinsic characteristics of fluoroplastics, the processing difficulty is very large. After long-term in-depth study, the inventor of the invention finds that the fluoropolymer coating solution provided in the invention can overcome the above disadvantages in the prior art. The coating obtained from the fluoropolymer coating solution provided in the invention has the characteristics of high fluorocarbon content, room temperature curing, good bonding strength with various substrates, no need of adhesive, convenient use and the like. The coating solution can be subjected to on-site construction under a variety of circumstances, and while improving the using performance, the use cost is reduced.
Owner:刘建林

Method for preparing multilayer structure composite steel plate

InactiveCN101486043ARefined organizationHigh bonding strengthRoll force/gap control deviceTemperature control deviceCarbon steelSteel plates
The invention discloses a method for preparing a composite steel plate with a multilayer structure. The multilayer structure prepared by the method is stainless steel/stainless steel or stainless steel/carbon steel/stainless steel or stainless steel/ ow alloy steel/stainless steel multilayer structure. The preparation method comprises the following steps: firstly, polishing the surfaces of a stainless steel plate and a carbon steel plate to reach the surface roughness degree Ra which is less than or equal to 25mu m; secondly, cleaning the treated surfaces, and removing oil stains, oxides and impurities on the surfaces of the plates; thirdly, stacking the cleaned plates together, fixing one end of the plate, polishing the plate with a definite gradient, and then placing the polished plates into an electric resistance furnace for thermal treatment; fourthly, taking out the plates and putting the plates on a rolling mill, and rolling the plates by 50 percent of pass pressing amount; fifthly, cutting checked edges and burrs at the edge parts of the rolled plates, cutting each plate into equal two parts, then repeating operations from step one to step five, and carrying out 5 to 6 passes of accumulative composite rolling; and finally putting the plates after the accumulative composite rolling into a gas protective annealing furnace for thermal treatment, cooling the plates, and taking out the plates at room temperature to obtain the composite steel plate with the multilayer structure.
Owner:XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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