47results about How to "Strong metallurgical bond" patented technology

The invention belongs to the field of material surface engineering and more particularly relates to a method for carrying out cladding on a high-hardness wear-resistant anti-corrosion nickel-based alloy material on a metal substrate E in a large area by applying a laser cladding technology, solving the problem of cracks generated in the laser cladding process of the high-hardness wear-resistant nickel-based alloy, in particular the cladding defects, such as cracks with the thickness of more than 1mm, pores and the like during large-area cladding. According to the invention, the high-hardness nickel-based alloy powder material is cladded on the surface of the metal substrate in the large area to form a high-hardness wear-resistant anti-corrosion nickel-based alloy coating by applying the laser cladding technology and adopting a scientific and reasonable process method. According to the method disclosed by the invention, stability and consistency of laser cladding are foundationally ensured, defects, such as cracks, pores, impurities can be prevented from generating, heat affected regions of the substrate are reduced, dilution rate is reduced, the high-wear-resistance anticorrosion nickel-based alloy coating with firm metallurgical bonding and fine and compact grains is obtained and has the hardness reaching 58-63HRC, and the service life of the processed workpiece can be prolonged by more than 1-2 times.

The multilayered steel armour consisting of the front-face ballistic-resistant armour layer (1) and the backing armour layer (2), which are fully metallurgically bonded by means of at least one joining metallic intermediate layer (3), for example, by casting, wide-area welding techniques, using technology of explosive cladding (high-velocity impact cladding), by roll welding or by a combination of the previous techniques. The joining metallic intermediate layer (3) between the front-face ballistic-resistant armour layer (1) and the backing armour layer (2) is made from the material featuring the face-centered cubic crystalline lattice (FCC lattice), in particular, from the nickel alloy containing maximally 98.0 wt % of nickel and/or from steel.

A method of heat sink manufacture in which the crests of a conductive fin are nested down into close fitting grooves in a flat, conductive base plate, with small interface gaps G. A compressive material is set inside the fin crests and the grooves, viscous enough to not intrude into the gaps G, to a level sufficient to substantially fill the grooves. The work piece thus created is subjected to a cold hydrostatic oil bath, crushing the outer surfaces of the fin crests into the internal surfaces of the grooves where the compressed seal covers, while the rest of the fin is supported against net deformation by the surrounding oil.

The invention relates to a preparation method for a coating on an electrolytic aluminum prebaked anode steel claw, which belongs to the technical field of metallurgical materials. The method comprises the following steps: removing dirt on the surface of the electrolytic aluminum prebaked anode steel claw through polishing, cleaning and drying the electrolytic aluminum prebaked anode steel claw and successively removing oil by using an oil removal agent and removing rust by using acid; subjecting the pretreated electrolytic aluminum prebaked anode steel claw to hot dip aluminum plating or fused salt electrolysis titanizing; and finally, carrying out micro-arc oxidation on the electrolytic aluminum prebaked anode steel claw treated by any method in a NaSiO3 solution, NaOH solution, NaH2PO4 solution or Na2SiO3 solution by using constant-current electrolysis so as to prepare the oxidation-resistant corrosion-resistant electrolytic aluminum prebaked anode steel claw treated by using a hot dip aluminum plating or fused salt electrolysis titanizing method and a micro-arc oxidation method. The preparation method provided by the invention overcomes the problems of high-temperature oxidation consumption of the anode steel claw and corrosion of electrolyte cryolite.

The invention discloses a preparation method for a bimetal metallurgy composite pipe of a three-layer structure. The method includes the steps that firstly, a thin-walled high alloy anti-corrosion pipe blank on the inner layer and a thin-walled high alloy anti-corrosion pipe blank on the outer layer are prepared through pouring according to a lost foam casting method; then, an interlayer carbon steel pipe blank is prepared through pouring and EPS modeling with the high alloy pipe blanks on the inner layer and the outer layer as mold cores, and a stainless steel/carbon steel/stainless steel bimetal composite pipe blank of a three-layer structure is obtained; and the bimetal composite pipe of the three-layer structure is manufactured by conducting three-roller hot rolling expanding deformation on the obtained bimetal pipe blank of the three-layer structure. The high-accuracy metal surfaces on the inner layer and the outer layer are obtained according to the lost foam casting method, and the metal thickness of the inner layer and the outer layer can be controlled. The resistance to three-roller hot rolling expanding deformation is small. The three layers of metal are combined through high-strength metallurgy. The surfaces on the inner layer and the outer layer are high in accuracy, good in ovality and high in wall thickness accuracy.

The invention provides a preparation method for stainless steel fiber sintered felt. The preparation method comprises the following steps that firstly, stainless steel fiber felt is put in a vacuum sintering furnace, the stainless steel fiber felt is heated up to 300 DEG C-600 DEG C under vacuum conditions, and then the temperature is kept for 30 min-120 min, low temperature sintering treatment is conducted, low temperature sintered felt is obtained after natural cooling; and secondly, the low temperature sintered felt is compressed to be 60%-95% in porosity by adopting a hydraulic press, then the compressed low temperature sintered felt is put in the vacuum sintering furnace, the compressed low temperature sintered felt is heated up to 900 DEG C-1000 DEG C under vacuum conditions, then the temperature is kept for 1 min-30 min, high temperature sintering treatment is conducted, and the stainless steel fiber sintered felt is obtained after natural cooling. According to the preparation method for the stainless steel fiber sintered felt, not only is firm metallurgical bonding among fibers achieved, but also coarsening of crystal grains inside the fibers is avoided, so that the mechanical property of the stainless steel fiber sintered felt is improved.

The invention discloses a bimetallic wear-resisting lining plate and a preparation method thereof and belongs to the technical field of metal material casting. The bimetallic wear-resisting lining plate comprises a matrix layer and a wear-resisting layer, wherein the wear-resisting layer is provided with more than two T-type projections inlaid into the matrix layer, the height ratio of every T-type projection to the wear-resisting layer is 1:1.2-1:2, the height ratio of the wear-resisting layer to the matrix layer is 1:1-1:3, the width ratio of every T-type projection to the lining plate is 1:8-1:15, the wear-resisting layer and the T-type projections are made of medium-carbon low-alloy silicon-manganese steel, the matrix layer is made of low-alloy carbon steel, and the bimetallic wear-resisting lining plate is prepared through compounding, smelting, casting, annealing and isothermal quenching. The bimetallic wear-resisting lining plate and the preparation method thereof have the advantages that through adoption of reasonable structural design and a layered casting technology, combination of a composite layer at an interface is closer, and the composite layer is less prone to separation; produced through the thermal treatment technology of simple isothermal quenching, the bimetallic wear-resisting lining plate is highly resistant to wear, high in tenacity, simple in preparation technology and convenient to produce, and production cost can be reduced effectively.

The invention discloses a sealing process of a turbine rotor blade cover plate top hole of a gas turbine. The process comprises the steps that (1), top hole pre-processing is conducted; (2), a red copper bar cooperates with the top hole is prepared to be used as a lining; (3), the red copper bar is installed at the bottom of the top hole, sealing alloy powder is delivered into the top hole througha coaxial gas carrying powder delivering device to perform laser cladding process, and the path is single-passage and multi-layer; (4), the red copper bar is separated from the cover plate, and castmodification processing is conducted on the cover plate of which the top hole is sealed; (5), nondestructive examination is conducted on the cover plate on which cast modification is conducted. According to the sealing process, a traditional vacuum brazing process is abandoned, a laser cladding technology is adopted to seal the turbine rotor blade cover plate top hole of the gas turbine, metallurgical bonding is formed between the sealing alloy powder and the top hole inner wall, the bonding strength is high, the bonding does not easily fall in the using process, vacuum does not need to be ensured, the sealing cost is low, and the cladding quality is improved by multi-layer clading.

The present disclosure relates to a polycrystalline diamond compact (PDC) cutter with protective barrier coating. The PDC cutter consists of an unleached or leached polycrystalline diamond (PCD) table, a cemented carbide body substrate, and a coating disposed on the cutter. The coating covers at least partially the exterior surfaces of the PCD table of the PDC cutter, and it may also extend over partially or entirely the exterior surfaces of the cemented carbide body. The coating is either a single layer or multilayer. The coating has a thickness of 0.4 μm-100 μm. The coating may have a strong metallurgical bonding with PDC cutter. The coating comprises an oxidation-resistant layer that protects the PDC cutter from thermal and mechanical degeneration during brazing and cutting applications. Methods for preparing such the coating comprise physical vapor deposition, chemical vapor deposition, thermoreactive deposition and diffusion, electrical plating, electroless plating, or their combinations.

The invention discloses a machining method of a three-layer clad steel plate. The machining method comprises the following steps: (1) surface treatment; (2) assembling; (3) groove machining; (4) segmental pressure application, groove welding and complete welding and sealing; (5) primary vacuumizing treatment; (6) secondary vacuumizing treatment and heating; (7) hot rolling; (8) cold rolling; (9) post-treatment to obtain a composite sheet. According to the machining method, an adhesive is adopted for bonding in the assembling process, so that primary connection is achieved; the grooves are machined in the welding process, pressure is applied in a segmented mode, and welding and secondary welding are conducted on the grooves, so that a combined blank plate is prevented from locally protruding or tilting; a two-time vacuumizing treatment mode and a heating mode are adopted during vacuumizing, so that firm metallurgical bonding can be formed between a base plate and a covering plate; and the carbon steel and stainless steel double-sided composite sheet machined by the machining steps has corrosion resistance, high mechanical strength and machinability.

The invention provides a method for preparing silver nanowire arrays by using capillary wetting effect, and relates to a method for preparing the silver nanowire arrays. The method aims to solve the technical problems that an existing silver nanowire array is complex in preparation process and poor in binding property with a target matrix. The method comprises the following steps of 1, mixing Ag powder with CuO powder; 2, heating the mixed powder; and 3, carrying out hydrothermal reaction. The method for preparing the silver nanowire arrays on an inert metal surface or a ceramic surface by using the capillary wetting effect is simple and effective in operation; and meanwhile, a method for removing a phase-changed AAO template through corrosion is provided, and the application prospect is good.

The invention discloses a preparation method of rectangular cross section heterologous metal composite wire. It assemblies the metal core rob which surface is treated in coated metal tube and installs it on the positioning device of bottom, blocks the top of coated metal pipes and metal core rob with top positioning device, the gap between inner wall of coated metal pipe and metal core rob is 0.5mm - 2.5mm; puts the coated metal pipe and metal core rob in cylindrical annular tube, setting explosives and electric detonator between the coated metal pipe and cylindrical annular tube uniformly; detonates electric detonator and realizes the explosive recombination of two metal of coated metal pipe and metal core rob in a moment; heat treats the combination rob which is connected and combined by explosion, plastically rotating forges and draws at temperature of 350 DEG C-950DEG C, then prepares the needed round cross section heterologous metal composite wire; rolls the round cross section heterologous metal composite wire into rectangular cross section heterologous metal composite wire. The invention is a method of simple production processes, high production yield and productivity, reducing the manufacturing cost significantly.

The invention discloses an aluminum rod for a copper-cladding aluminum wire, which comprises the following ingredients by weight percent: 95.3 to 94.9 percent of aluminum pig, 3 to 3.3 percent of magnesium and 1.7 to 1.8 percent of chromium. The invention also provides a processing method of the aluminum rod for the copper-cladding aluminum wire, which comprises the following steps that: 95.3 to 94.9 percent of aluminum pig and 1.7 to 1.8 percent of chromium are added, 3 to 3.3 percent of magnesium is added after the aluminum pig and the chromium are molten, water is discharged after multi-time foreign matter removal processing and after the heat is preserved for a period of time, and then the wire drawing processing and the wire take-up processing are carried out; and the above wire is annealed to standby use after being polished. The aluminum rod has excellent performance, firm metallurgical bonding between the aluminum rod and a copper layer can be realized, and the overall performance of the copper-cladding aluminum can be improved. The invention also provides a copper-cladding aluminum utilizing the aluminum rod.

The invention discloses a combined roller sleeve, a manufacturing method thereof and a roller comprising the combined roller sleeve. The combined roller sleeve comprises an outer operation layer, a combined transition layer and an inner seamless pipe. The inner seamless pipe is a prefabricated low-carbon seamless steel pipe. The outer operation layer is a cast-in-place abrasion-resistant alloy steel layer. The combined transition layer is jointly formed by molten iron generated by reaction of thermite and a slag former and cast-in-place alloy liquid as well as molten iron on the surface layerof the inner seamless pipe. The outer operation layer, the combined transition layer and the inner seamless layer are metallurgically bonded. By coating the mixed coating of the thermite and the slagformer to the outer surface of the inner seamless pipe, the mixed coating has a chemical reaction with the high-temperature alloy liquid in the cast-in-place process of the outer operation layer, molten iron is generated, heat is released to melt the surface layer of the seamless steel pipe, the generated molten iron and the molten iron molten on the surface layer of the seamless steel pipe jointly form the combined transition layer, and therefore, firm combination of the outer operation layer and the inner seamless pipe can be achieved.

The invention provides a method for preparing a titanium-steel composite plate by adding a pure iron interlayer through electromagnetic induction heating rolling. The method comprises the following steps: S1, cutting a plate blank and carrying out surface treatment; S2, assembling and fixing the composite plate blank; S3, carrying out argon protection; S4, carrying out induction heating of the composite plate; and S5, carrying out rolling. The characteristics that pure iron interlayer metal is good in mobility and easy to combine with pure titanium and carbon steel are utilized, electromagnetic induction heating is adopted to replace traditional resistance wire heating furnace heating to achieve rapid heating of the composite plate blank in the protective gas atmosphere, the production process is simplified, the titanium-steel composite plate has a certain temperature difference through electromagnetic induction heating, the warping degree of the rolled composite plate blank is reduced, and the titanium-steel composite plate with high bonding strength and good deformation coordination can be efficiently prepared.

The invention provides an environment-friendly drinking water pipe with a natural bacteriostasis function. The drinking water pipe is made of materials of copper and aluminum metallurgical composite single-side copper; a copper and aluminum metallurgical composite plate belt uses aluminum as base materials; a metal aluminum base composite material of a single-side metallurgical composite copper belt is required to reach the metallurgical compounding between copper and aluminum; the copper belt needs to be pure copper or copper alloy with the copper content being higher than 60 percent. The copper layer surface of the copper and aluminum metallurgical composite materials is used as the inner surface of an air pipe. The copper and aluminum metallurgical compounding drinking water pipe belongs to a new generation of natural bacteriostasis (sterilization) environment-friendly drinking water pipe replacing the drinking water pipe made of pure copper, stainless steel or other materials. The drinking water pipe is made of copper and aluminum metallurgical compounding composite materials, and the bonding intensity is higher than or equal to 100MPa. The surface of the prepared copper and aluminum composite plate is smooth and flat. In the production process, phenomena of cracking, falling and the like cannot occur during the processing of bending, hole drilling, hole punching, thread tapping, antique processing, lacquering and the like, and the product quality and the finished product rate of the drinking water pipe are ensured.

The invention discloses an integrated device for powder preparation and powder mixing, and an application thereof. The integrated device for powder preparation and powder mixing comprises a medium-frequency smelting furnace, a heat-insulation furnace, an upper spray disc, a lower spray disc, a collection bucket and a powder spray device. The medium-frequency smelting furnace is a fixed-point casting furnace, and a casting center corresponds to the center of the heat-insulation furnace; and the lower spray disc and the upper spray disc are placed in an upper-end connector of the collection bucket, the lower spray disc is connected with a high-pressure water pipeline, the upper spray disc is connected with the powder spray device, the heat-insulation furnace is installed at the top of the upper spray disc, a discharge spout is formed in the bottom of the heat-insulation furnace, and the center of the discharge spout corresponds to the centers of the spray discs. The lower end of the collection bucket is connected with a filter-pressing bucket, and a butterfly valve is arranged between the collection bucket and the filter-pressing bucket. According to the integrated device for powderpreparation and powder mixing, and the application thereof, the two actions of preparation and mixing for metal powder are realized on one piece of equipment, and the integrated device for powder preparation and powder mixing is simple and convenient to operate, high in production efficiency, and low in labor intensity; and moreover, the distribution uniformity and the bonding strength of dispersion-strengthening-phase particles or high-melting-point-phase particles in a matrix material are improved and increased, and the integrated device for powder preparation and powder mixing is simple inprocess path, short in processing flow, and suitable for large-batch production.

The invention discloses an environmental friendly heating and ventilating air pipe with the natural antibacterial function. The heating and ventilating air conditioner air pipe is made of copper and aluminum metallurgy composite single-face or double-face composite copper, and aluminum serves as the base material of a copper and aluminum metallurgy composite board belt. According to the metallic aluminum matrix composite material of the single-face or double-face composite copper belt, metallurgy composition between copper and aluminum is required, the copper belt is made of pure copper or copper alloy, and the copper content of the copper belt must be more than 60 percent. According to the heating and ventilating air conditioner air pipe, the copper layer face of the copper and aluminum metallurgy composite material serves as the inner surface of the air pipe. The heating and ventilating air conditioner air pipe made of the copper and aluminum metallurgy composite material is a new generation natural antibacterial environmental friendly air pipe for replacing a galvanized sheet air pipe, a stainless steel air pipe and air pipes made of other materials. The heating and ventilating air conditioner air pipe is made of the copper and aluminum metallurgy composite material, the bonding strength of the heating and ventilating air conditioner air pipe is equal to or larger than 100 Mpa. The surface of a manufactured copper and aluminum composite plate is clean and smooth. Cracking, disengaging and other phenomena cannot occur in the producing process of bending, drilling, punching, tapping, old making, painting and the like, and the yield and quality of heating and ventilating air conditioner air pipelines are guaranteed.