38results about How to "Control interface response" patented technology

The invention discloses a modified graphene-reinforced aluminum matrix composite material and a preparation method thereof. The method includes the steps that graphene powder, silica powder, grinding balls and stearic acid are placed into a ball grinding mill, liquid nitrogen is filled in till all the grinding balls are immersed and then ball milling is performed, and mixed powder is obtained and dried; the dried mixed powder is sintered, so that modified graphene is obtained; the modified graphene, high-purity aluminum powder, grinding balls and stearic acid are put into the ball grinding mill, liquid nitrogen is filled in for ball milling, modified graphene-aluminum powder mixed powder is obtained, and drying is further performed; and the dried modified graphene-aluminum powder mixed powder is added into a molten aluminum or molten aluminum alloy solution to be evenly stirred, and casting is carried out. By the adoption of the method, graphene is modified, good wettability between the graphene and an aluminum matrix can be obtained, and the bonding strength of the graphene and the aluminum matrix is improved. By blending different molten aluminum or molten aluminum alloy solutions, graphene-reinforced aluminum matrix composite material billets of various specifications can be obtained by means of casting, and batch production is achieved.

The invention discloses a method for preparing a titanium-iron particle reinforced hydroxyapatite-based bioceramic material and belongs to the technical field of materials. The method comprises the following steps: mixing titanium powder and iron powder, mixing and finely grinding by ball milling and obtaining composite powder; mixing the composite powder with hyaluronic acid (HA) powder to obtain mixed powder, uniformly mixing by ball milling in absolute ethanol serving as a medium, drying under a condition of a temperature of 80+/-5 DEG C to remove ethanol and obtaining HA/Ti-Fe powder; and subjecting HA/Ti-Fe powder to unidirectional press forming or cold isostatic press forming, sintering under vacuum conditions and obtaining the titanium-iron particle reinforced hydroxyapatite-based bioceramic material. The method disclosed by the invention is simple in process and low in cost, and can realize industrial production easily; and the prepared bioceramic material has excellent mechanical performance and biological performance.

The invention discloses a method for preparing a chopped carbon fiber reinforced amorphous composite material and a device thereof, and relates to the technical field of forming an amorphous compositematerial by contacting fibers with molten metal and performing rapid solidification. The method adopts a chemical plating method to improve the wettability of the carbon fibers, a carbon fiber preform is prepared through a copper mold, furthermore, the chopped carbon fiber reinforced amorphous composite material is prepared by using a vacuum low-pressure casting method, namely a spray casting method, and the defects that in the prior art, the fiber agglomeration phenomenon caused by non-uniform dispersion of reinforced fibers in a matrix or an interface structure with brittleness equal to that generated by the carbon fibers and the matrix at an interface, the method is only suitable for a traditional magnesium alloy matrix, a high cooling speed cannot be achieved, an amorphous matrix cannot be obtained, and the amorphous composite material cannot be prepared for various amorphous alloy matrixes needing vacuum melting are overcome.

A method for preparing a ferric oxide ceramic thin film on the surface of three-dimensional network silicon carbide belongs to the material technical field, and comprises the following steps: (1) a sol-gel method is adopted for preparing iron sol; (2) a vacuum impregnation method is adopted for coating on 3D-SiC; and (3) the three-dimensional network silicon carbide coated by the iron sol is sintered. The invention uses the low-cost raw material, the simple preparation method and the short preparation period to prepare the uniform and compact ferric oxide ceramic thin film with low porosity on the 3D-SiC matrix surface; the thin film has stronger bonding strength with the matrix and has excellent thermal shock resistance, thus realizing to control the interface reaction of the 3D-SiC/steel.

The invention discloses a method for modifying a high-wettability coating on the surface of a metal-based compound material reinforcement. The method comprises the following steps of: 1, by a common coating preparation method, forming a metal oxide coating, of which reducibility is lower than that of magnesium, on the surface of the reinforcement; 2, and placing the reinforcement coated with the metal oxide coating and pure magnesium in a vacuum furnace in a way of placing the pure magnesium on the bottom of the furnace and placing the reinforcement above the pure magnesium, vacuum-pumping the furnace, keeping the vacuum degree below 10Pa, heating the furnace to 600 to700 DEG C, and keeping the temperature for 5 to 60 minutes so as to allow the magnesium steam and the metal oxide coating on the surface of the reinforcement to undergo an oxidation-reduction reaction to generate a compound layer formed by an inner layer made of compounds and an outer layer made of reduced metal. The method has the advantages of simple and controllable process, low equipment requirements, low cost, wide application range, high mechanical and physical properties and the like.

The invention discloses a Ti-Al/B4C-based marine composite material and a preparation method thereof. The Ti-Al/B4C-based marine composite material comprises B4C powder, a Ti-Al intermetallic compound, a boride, and carbon nano-tubes. The preparation method of the Ti-Al/B4C-based marine composite material comprises the following steps of carrying out ball milling mixing of the raw materials and absolute ethanol as a medium, carrying out vacuum drying to obtain mixed powder, putting the mixed powder into a graphite mold, carrying out hot-pressed sintering, carrying out heat preservation, and cooling to obtain the Ti-Al/B4C-based marine composite material. The Ti-Al/B4C-based marine composite material has a low preparation cost, can be obtained by the simple preparation method, and has low density, high strength and good corrosion resistance.

The invention provides Ti/X metal ceramic with a laminated structure and a preparation method of the Ti/X metal ceramic. The Ti/X metal ceramic with the laminated structure sequentially comprises a Tilayer, a Ti-X transition layer, an X layer, a Ti-X transition layer, a Ti layer... a Ti-X transition layer, an X layer, a Ti-X transition layer and a Ti layer from bottom to top. The Ti/X metal ceramic with the laminated structure has the characteristics of toughness of titanium, hardness of an X nano material and the like, and has good ductility, heat resistance, wear resistance and impact resistance. According to the Ti/X metal ceramic with the laminated structure and the preparation method of the Ti/X metal ceramic, printing is carried out layer by layer through 3D printing equipment according to the stacking sequence of the Ti layer-X layer-Ti layer-X layer-Ti layer, an interface between the Ti layers and the X layers is subjected to rapid cold processing treatment through ultra-strong pulse energy beams or particle beams, and the Ti-X transition layers combining the Ti layers and the X layers are formed; and the problems of poor chemical compatibility and wettability of a titanium nano material and the X nano material can be solved, compounding of the Ti nano material and the X nano material can be well achieved, and then the Ti/X metal ceramic which is high in interface bonding and has the laminated structure is formed.

The invention relates to a preparation method of a high-electromagnetic-shielding hollow micro-sphere enhanced AZ91 magnesium matrix composite and relates to a preparation method of a hollow micro-sphere enhanced AZ91 magnesium matrix composite. The preparation method is used for solving the problems that structures of hollow micro-spheres are seriously damaged in the preparation process of an existing composite material. The method comprises the following steps: firstly, adding water into quick lime to react, aging, and calculating the weight of Ca(OH)2 and water in a Ca(OH)2 solution; secondly, adding the hollow micro-spheres and water to obtain a mixed solution, cleaning the hollow micro-spheres after reaction, and drying to obtain surface-coated hollow micro-sphere particles; thirdly, melting an AZ91 magnesium alloy, removing surface oxide scales, cooling, preserving heat, adding the hollow micro-sphere particles, stirring, rising temperature, and molding to obtain the magnesium matrix composite of which the hollow micro-sphere surface appearance is relatively complete. According to the prepared composite disclosed by the invention, the appearance of the hollow micro-spheres in the composite is kept relatively well, and the electromagnetic shielding effectiveness reaches 79-82dB. The preparation method disclosed by the invention is used for preparing the magnesium matrix composite.

The invention provides a low-cost rare-earth-free nanocomposite permanent-magnetic material and a preparation method thereof. A chemical formula of the low-cost rare-earth-free nanocomposite permanent-magnetic material is Mn<53-x>Al<45>C<2>W<x>/(Fe<l-y>Co<y>)<2>B. The preparation method comprises the steps of: burdening a pure metal raw material according to the name of an Mn<53-x>Al<45>C<2>W<x> alloy to obtain a master alloy ingot and fabricating a thin strip; carrying out vacuum heat treatment on a quick quenched strip to obtain a tau-phase Mn<53-x>Al<45>C<2>W<x> alloy; carrying out burdening according to (Fe<l-y>Co<y>)<2>B alloy ingredients to obtain the master alloy ingot and fabricating the thin strip; carrying out high-energy ball-milling on the quick quenched strip of the Mn<53-x>Al<45>C<2>W<x> alloy and the quick quenched strip of the (Fe<l-y>Co<y>)<2>B alloy which are subjected to heat treatment to prepare nanocrystalline alloy powder; carrying out spark plasma sintering on the obtained nanocomposite powder to obtain a full-dense nanocomposite permanent-magnetic material; and carrying out thermal deformation on the sintered nanocomposite permanent-magnetic material, improving the degree of orientation and obtaining the low-cost rare-earth-free anisotropic nanocomposite permanent-magnetic material. The prepared permanent-magnetic material does not contain a rare-earth element; the raw material cost is effectively reduced; and meanwhile, the technology is simple, easy to operate and suitable for large-scale mass production.

The invention provides a laser wire filling welding method for medium-thickness plate aluminum/steel dissimilar metal. The laser wire filling welding method comprises the following steps that (1) a Y-shaped groove and a V-shaped groove are formed in a to-be-welded aluminum plate and a to-be-welded steel plate which are equal in thickness respectively, and the Y-shaped groove, the V-shaped groove, the upper surface and the lower surface of the aluminum plate and the upper surface and the lower surface of the steel plate are deeply cleaned; (2) the to-be-welded aluminum plate and the to-be-welded steel plate are placed on a welding clamp to be clamped and fixed, and a welding joint is a butt joint; (3) the positions of a main light beam and an auxiliary light beam are adjusted, and the light beam power is set; and (4) process parameters are set, and once the welding process parameters are determined, the welding process parameters are kept unchanged in the welding process. According to the welding method, laser wire filling is adopted so that the absorptivity of the aluminum alloy can be improved, the welding process is stabilized, crack forming conditions are prevented, the mechanical property of a welding seam is improved, temperature field distribution of a welding joint can be effectively adjusted, interface reaction can be controlled favorably, and meanwhile, the defect that the side wall is not fused is overcome, and the strength of the welding joint is improved.

The invention discloses a smelting method for improving the cleanliness of heavy rail steel and belongs to the technical field of steel metallurgy. The technical problem solved by the invention is that existing domestic heavy rail steel cleanliness can not meet the requirements of high-speed railways. The method comprises the steps of liquid iron pretreating, converter smelting, LF refining, RH refining and continuous casting and performs blowing smelting on the liquid iron taking active lime, silica sand, high-magnesium lime, steel smelting sludge pellet and sodium carbonate as slag making materials in the converter smelting process, and the content of P is controlled to be 0.003% or below. By means of the above steps of the smelting method for improving the cleanliness of the heavy railsteel, the content of elements in a steel rail can be controlled as P less than or equal to 0.0060%, S less than or equal to 0.0030%, O less than or equal to 0.0010%, N less than or equal to 0.0050% and H less than or equal to 0.00015%, P+S+O+N+H is less than or equal to 160 ppm, the grade of inclusion is less than or equal to 1.0 grade, the cleanliness of the heavy rail steel is significantly improved, and the smelting method for improving the cleanliness of the heavy rail steel has certain social benefits and is worth popularizing and applying.