341 results about "Alloy substrate" patented technology

The invention relates to the technical field of aircraft part processing, testing or inspection and the like, and provides an aircraft aluminum alloy plate aging evaluation method based on an equivalent circuit model, and the method comprises the following steps: collecting electrochemical impedance spectrums of samples with different exposure age limits, and extracting electrochemical impedance spectrum characteristics of the samples; establishing an equivalent circuit model comprising solution resistance, coating resistance, coating capacitance, Warburg impedance, anodic oxide film charge transfer resistance, interface capacitance, aluminum alloy matrix charge transfer resistance, interface electric double-layer capacitance, inductance and corresponding resistance of the inductance based on the characteristics, wherein the equivalent circuit model comprises the solution resistance, the coating resistance, the coating capacitance, the Warburg impedance, the anodic oxide film charge transfer resistance, the interface capacitance, the aluminum alloy matrix charge transfer resistance and the interface electric double-layer capacitance; and analyzing a resistance curve and a capacitance curve obtained by fitting the model to complete the evaluation of the corrosion and aging degree. According to the method, systematicness and accuracy of aging evaluation are improved, an electrochemical mechanism in the corrosion process can be disclosed, time correlation modeling of the aging process can be achieved, and the method is suitable for long-term service performance monitoring and service life prediction of the aviation aluminum alloy structure.

The application discloses a kind of corrosion-resistant aluminum alloy profiles and preparation method thereof, belong to aluminum alloy profile technical field.The application can ensure the strength of aluminum alloy profile by optimizing the composition of corrosion-resistant aluminum alloy, and has a positive effect on the corrosion resistance of aluminum alloy profile.In addition, the application forms a corrosion-resistant coating on the surface of the corrosion-resistant aluminum alloy substrate by laser cladding, which can significantly improve the corrosion resistance of the aluminum alloy profile while ensuring the application performance of the aluminum alloy profile.In the corrosion-resistant coating, nickel powder can enhance the resistance to pitting and intergranular corrosion, and improve the adhesion to the aluminum alloy substrate.Boron nitride can improve the surface acid resistance and wear resistance of the aluminum alloy profile, and block the corrosion channel.Lanthanum oxide and cerium dioxide have a synergistic effect, which can refine the surface grains, reduce the pores generated during the cladding process, improve the compactness of the coating, promote the compatibility with the aluminum alloy substrate, and ensure the appearance quality of the aluminum alloy profile.

The invention discloses a preparation method of a high-hydrophobicity liquid lead bismuth alloy nitride coating capable of increasing a high-temperature contact angle, which comprises the following steps of: pretreating a substrate, depositing a FeCrAl coating on the surface of the substrate by adopting magnetron sputtering, and nitriding the FeCrAl coating to obtain a nitride coating; the invention further discloses the high-hydrophobicity liquid lead bismuth alloy nitride coating for improving the high-temperature contact angle. According to the preparation method, the FeCrAl coating is nitrided, so that the surface strength and corrosion resistance of the FeCrAl coating are improved, the formed FeCrAl nitride layer with a compact structure has high lyophobicity on the liquid lead bismuth alloy, the material surface is in a non-wetting state all the time, the liquid lead bismuth alloy can be effectively prevented from permeating into an alloy matrix, and the service life of the material is prolonged. The material is suitable for being used as a cladding material of a lead-cooled fast neutron reactor.

The invention belongs to the technical field of aluminum alloy surface treatment, and discloses an aluminum alloy micro-arc oxidation film layer with high plasma fluorination environment resistance and a preparation method thereof.The aluminum alloy serves as a matrix, the micro-arc oxidation film layer with high plasma fluorination environment resistance is formed on the surface of the matrix, the thickness of the film layer is 10-50 micrometers, the porosity is 3-5%, and the thickness of the film layer is 10-50 micrometers. The pore diameter is 0.5-1 [mu] m, and the alpha-Al2O3 accounts for 60-80%. According to the film layer, generation of more compact Al2O3 is promoted by adding zircon salt and yttrium salt, the structure and performance of the film layer are improved through introduced zirconium and yttrium elements, and the film layer has the advantages of being high in hardness, low in porosity, high in corrosion resistance and high in wear resistance.

The invention provides a method for prolonging the high-temperature service life of a thermal barrier coating of a hydrogen-doped gas turbine. The method comprises the steps that Ni, Co, Cr, Fe, Al, Hf, Si and Y are smelted and cast into master alloy according to the proportion; preparing the mother alloy into high-entropy alloy powder through an inert gas atomization process; high-entropy alloy powder is deposited on the surface of the high-temperature alloy substrate by adopting a high velocity oxy-fuel spraying process, and a bonding layer of the thermal barrier coating is obtained; and preparing a thermal barrier coating on the bonding layer by adopting a plasma spraying process, and carrying out vacuum heat treatment on the thermal barrier coating in advance. The high-entropy alloy bonding layer provided by the invention has better thermal stability, and can still keep strong bonding force between the ceramic layer and the bonding layer alloy after water quenching high-temperature thermal cycle service. And the transition group high-entropy alloy bonding layer is beneficial to formation of a thermal growth oxide layer, has an inhibition effect on diffusion of metal elements and coating degradation in the hydrogen-induced corrosion and high-temperature steam corrosion processes, and can prolong the high-temperature thermal shock service time of the hydrogen-doped gas turbine.

The invention provides a preparation method and application of a pure copper coating, and relates to the field of surface functional coatings, and the preparation method comprises the following steps: preparing pure copper powder, and carrying out sand blasting treatment on the surface of an aluminum alloy substrate; the aluminum alloy substrate is fixed in a closed cold spraying chamber, and pure copper powder is loaded into helium cold spraying equipment in the closed cold spraying chamber; vacuumizing until the pressure in the closed cold spraying chamber is lower than a preset pressure threshold value and the oxygen content in the chamber is lower than a preset value; helium in a buffer tank is adopted as main gas and powder feeding gas, and a pure copper coating is formed on the surface of the aluminum alloy substrate through spraying of helium cold spraying equipment; and the helium circulation system is synchronously started to recover helium in the cavity, and the helium is compressed into the buffer tank after being filtered and cooled, so that helium circulation is realized. The method adopts the circulating helium atmosphere to avoid the problem that the impurity content of the coating is increased due to high-temperature oxidation of the copper coating, the oxygen content of the coating is remarkably reduced, and the particle interface bonding is improved, so that the electric conduction and heat conduction performance of the pure copper coating is improved, and the helium use cost is reduced.

The invention discloses a preparation method of an AAO / ZnMgAl-LDHs corrosion-resistant composite coating on an aluminum alloy surface, and belongs to the technical field of aluminum alloy surface protection treatment.The preparation method comprises the steps that firstly, an aluminum alloy base material is pretreated, then sulfuric acid and tartaric acid are mixed to prepare an anodic oxidation electrolyte, the treated aluminum alloy base material is placed in the electrolyte to be subjected to an electrified reaction to form an AAO film, and then the AAO film is subjected to heat treatment; and dissolving urea, magnesium salt and zinc salt in deionized water, adjusting the pH value to prepare an LDHs prefabricated solution, placing the aluminum alloy substrate with the AAO film in the LDHs prefabricated solution for in-situ growth, and finally washing and blow-drying to obtain the AAO / ZnMgAl-LDHs composite coating. The method is simple in preparation process, easy to operate, economical, environmentally friendly and good in hole sealing effect, the prepared AAO / ZnMgAl-LDHs composite coating is uniform and compact, the corrosion resistance of the aluminum alloy can be remarkably improved, the surface protection performance of the aluminum alloy can be effectively enhanced, and reliable guarantee is provided for application of the aluminum alloy in a complex environment.

The invention provides a friction extrusion deposition aluminum alloy part and a preparation method thereof, and relates to the technical field of additive manufacturing, and the preparation method comprises the following steps: depositing an aluminum alloy raw material on the surface of an aluminum alloy substrate layer by layer by adopting a friction extrusion deposition additive mode to obtain an additive part; wherein the friction extrusion deposition additive process is carried out in cooling liquid; and the additive part is subjected to heat treatment, and the friction extrusion deposition aluminum alloy part is obtained. The heating temperature of the lower additive layer is reduced through the cooling liquid, so that precipitation phase coarsening caused by heating of the lower layer is reduced, a microstructure with a fine precipitation phase is obtained, and the mechanical property of the aluminum alloy part is improved.

This invention relates to the field of electroless plating technology, and more particularly to a low-phosphorus electroless nickel plating solution and a method for nickel plating on an aluminum alloy substrate. The low-phosphorus electroless nickel plating solution comprises the following components by mass concentration: a nickel ion source in the form of Ni... 2+ Calculated as 1.0~5.0 g / L; hypophosphite as H2PO2 ‑ The concentrations are calculated as follows: 20–45 g / L; glycine 5–40 g / L, gluconate 5–60 g / L; polyaspartic acid and / or its salts 0.2–5.0 g / L; pH buffer 2–25 g / L; alkyl glycosides 0.05–1.0 g / L; iodate stabilizer, in IO3... ‑ The concentration is calculated to be 0.2~5.0 mg / L. This invention maintains a high deposition rate and significantly improves the tolerance of by-products in the bath solution under low nickel ion concentration conditions. It is also free of heavy metals and sulfur-containing organic stabilizers, reducing the metal load and environmental risk of the waste liquid. It is suitable for various aluminum alloy matrices treated with double zinc replacement.

To provide an aluminum alloy sheet for a magnetic disk, an aluminum alloy sheet blank for the magnetic disk, and an aluminum alloy sheet substrate for the magnetic disk, having satisfactory rigidity and capable of suppressing thermal deformation during magnetic film sputtering.SOLUTION: An aluminum alloy sheet for a magnetic disk, comprising: 0.1 to 7.0 mass% of Mg; 0.005 to 1.0 mass% of Cr; 3 to 100 mass ppm of Be; 0.20 mass% or less of Si; 0.05 to 5.9 mass% of at least one or more of Fe, Mn, and Ni in total; and a balance of Al and impurities.SELECTED DRAWING: None

To provide an aluminum alloy substrate for a magnetic disk, in which generation of microscopic defects is reduced without significantly changing manufacturing steps, and a manufacturing method thereof.SOLUTION: An aluminum alloy substrate for a magnetic disk has two or more Ni-P plating layers continuously laminated. The two or more Ni-P plating layers respectively have the same component composition. In addition, the Ni-P plating firm is formed using an electroless Ni-P plating solution containing the same concentration of P.SELECTED DRAWING: None

This invention provides a high-entropy alloy nano-coating high-temperature oxidation-resistant modification preparation process, belonging to the field of coating modification technology. The high-entropy alloy nano-coating high-temperature oxidation-resistant modification preparation process specifically includes the following steps: S1. Target material selection and preparation; S2. Alloy substrate treatment; S3. Low-temperature nanocrystalline coating deposition; S4. Coating densification treatment; S5. Low-temperature recovery annealing; S6. Pre-oxidation treatment. Through the synergistic process of low-temperature preparation of the alloy nano-coating, densification annealing, and pre-oxidation, the high-temperature strength and phase stability of the coating are improved by utilizing the lattice distortion effect. A thermodynamically stable protective oxide film of aluminum oxide and chromium oxide is generated in situ on the surface, solving the problems of traditional chromium-based coatings such as few main components, poor oxidation resistance, and short lifespan. This significantly improves the service reliability and safety of nuclear reactor structural materials under high-temperature irradiation environments.

The invention discloses a high-entropy ceramic thermal barrier coating and a preparation method thereof, and relates to the technical field of thermal barrier coating materials. The method comprises the following steps: mixing ZrO2, HfO2, Ta2O5 and various rare earth oxides, and carrying out high-energy wet ball milling, drying, solid solution sintering and crushing to prepare submicron high-entropy ceramic powder; mixing the modified powder with aluminum sol obtained by hydrolyzing aluminum isopropoxide, rare earth nitrate and the like, dispersing, drying and carrying out heat treatment to obtain modified powder coated with aluminum oxide nanoparticles on the surface; carrying out spray drying granulation to obtain spherical agglomerated powder; and finally, a DD6 single-crystal high-temperature alloy matrix is subjected to sand blasting and pre-oxidation treatment, agglomerated powder is deposited on the surface of the matrix through a plasma spraying vapor deposition technology, a columnar crystal coating is formed, and a finished product is obtained through vacuum annealing. The coating prepared through the method is uniform in structure and high in bonding strength, thermal shock resistance and high-temperature phase stability are remarkably improved, and the coating is suitable for surface protection of aero-engine hot end components.

A multi-cutting-edge diamond composite includes a columnar hard alloy substrate and a diamond composite layer, the diamond composite layer being disposed at a top end of the hard alloy substrate, wherein a circumferential edge of a top end of the diamond composite layer is provided with at least two segments of different chamfers to form different cutting edges. By providing different chamfers on the circumferential edge of the top end of the diamond composite layer, multiple cutting edges are formed in the circumferential direction of an end face of the diamond composite, such that different edges of the same composite sheet have different attacking abilities and impact resistance abilities. Since the chamfers form various cutting edges with different properties, the same diamond composite can meet the requirement of drilling in different strata, and can enable a diamond drill bit to adapt to the requirement of drilling in complex strata.

The invention discloses a thin infrared high-reflection mirror and a preparation method thereof, and belongs to the technical field of optical devices. The preparation method comprises the following steps: depositing a Ni-Ti alloy film on a heated Ti alloy substrate in a deposition atmosphere in which Ar gas and a small amount of NH3 gas are introduced by adopting a radio frequency magnetron co-sputtering process and taking a Ti target and a Ni target as sources; the Ni target sputtering power is increased in a stepped mode, so that the Ni content in the film layer is gradually increased from the interface to the surface, and a component gradient structure is formed; and carrying out vacuum annealing and polishing treatment after deposition. Through the etching effect of the NH3 active group and the component gradient structure design, the internal stress of the film layer is synergistically reduced, the density and the interface bonding force are improved, and the obtained reflector has the advantages of moderate film layer thickness, firm bonding, high surface quality and easy processing, and is suitable for light-weight and high-performance infrared optical systems in the fields of aerospace and the like.

The present application relates to the technical field of high-temperature oxidation-resistant coating, and particularly relates to a modified NiCoCrAlYTa bonding layer and a preparation method thereof.The present application adopts low-pressure plasma gas spraying to prepare a NiCoCrAlYTa bonding layer on the surface of a high-temperature alloy substrate, then performs shot peening treatment to reduce the surface roughness of the coating, then performs Al-Cr co-diffusion, and forms a co-diffusion bonding layer with an outer Al-rich layer, an intermediate Cr-rich layer and an inner NiCoCrAlYTa layer, finally performs vacuum pre-oxidation to form a TGO layer on the surface of the co-diffusion bonding layer, thereby obtaining the modified NiCoCrAlYTa bonding layer.The modified NiCoCrAlYTa bonding layer prepared by the present application has excellent high-temperature oxidation resistance and corrosion resistance, and can realize long-time service.

The utility model belongs to the technical field of aluminum coil processing, particularly relates to a color-coated aluminum coil with dual functions of static resistance and corrosion resistance, and provides the following scheme aiming at the problem that the conventional color-coated aluminum coil is difficult to have good static resistance and corrosion resistance at the same time: the color-coated aluminum coil comprises an aluminum alloy body, a surface layer is adhered to the upper portion of the aluminum alloy body, and a pretreatment layer is adhered to the position, located at the bottom of the surface layer, of the top of the aluminum alloy body. According to the anti-static aluminum alloy coating, through the anti-static layer, the surface resistance of the coating can be effectively reduced, accumulated static electricity can be quickly conducted and removed, and harm caused by the static electricity is avoided; according to the aluminum coil, the corrosion medium is effectively prevented from making contact with the aluminum alloy matrix, the aluminum coil is prevented from being corroded, the anti-static capacity of the aluminum coil is further enhanced, and the breathable layer effectively discharges gas and moisture generated in the coating due to temperature change, the curing process and the like, so that the overall stability and durability of the coating are improved.

This invention discloses a laser cladding titanium alloy coating on an aluminum alloy substrate and its preparation method. The invention uses a self-developed small-beam, high-energy ring laser to replace the traditional laser, enabling effective metallurgical bonding between the aluminum alloy substrate and molten titanium alloy powder to form a fusion layer. This fusion layer then facilitates the successful preparation of a high-performance titanium alloy coating on the aluminum alloy surface. The prepared laser cladding coating exhibits a dense overall structure, free from defects such as cracks and pores. The aluminum alloy substrate remains undeformed, demonstrating high interfacial bonding strength and excellent wear and corrosion resistance. It effectively resists the attack of chloride ions from atmospheric and marine environments on the aluminum alloy substrate, thereby significantly extending the service life of aluminum alloy components. This invention overcomes the challenge of preparing titanium alloy coatings on aluminum alloy surfaces using laser cladding, and also provides a new approach and theoretical basis for metal protection, showing promising application prospects.

The application provides a high-corrosion-resistance high-temperature-resistant copper alloy and a preparation method thereof. Alloy elements and their weight percentage contents added during smelting of the alloy are as follows: Ni: 10%, Sn: 1%-5%, and the balance being Cu, forming a ternary copper alloy. Heat treatment is carried out in a protective atmosphere, a composite protective film with a certain thickness is formed on the surface to cover the alloy substrate, the alloy is protected, the further diffusion of harmful ions in a salt spray environment to the inside is inhibited, and the corrosion resistance of the copper alloy is improved. The ternary copper alloy is annealed by controlling the oxygen partial pressure atmosphere, including ultra-low oxygen partial pressure gas regulation and heat treatment, a composite oxidation film with a certain thickness of Ni and Sn elements is formed, the oxidation resistance is improved, no obvious surface oxidation phenomenon occurs at 600 DEG C for 12 hours, and the alloy can cope with more complex corrosion environments. The application has the advantages of simple and effective process, green and no pollution, and important significance for the development of modern metal materials.

The invention belongs to the technical field of hard alloy cutter coatings, and particularly relates to a gradient diamond film and a preparation method and application thereof. A hard alloy substrate is subjected to ultrasonic seeding through diamond suspension liquid, then the gradient diamond film is prepared through sectional type chemical vapor deposition, and the gradient diamond film comprises a nanocrystalline diamond film layer and a boron-doped microcrystalline diamond film layer which are sequentially arranged in a stacked mode. The sectional type chemical vapor deposition comprises first-stage deposition and second-stage deposition which are carried out in sequence. According to the preparation method provided by the invention, through dynamic coupling of air pressure, temperature and gas flow and design of the gradient diamond film, the core problem of'uneven gradient structure-concentrated interface stress' in the prior art is solved, and a technical support is provided for engineering application of a high-end tool coating.

The invention provides a multifunctional composite coating system based on a PA / PPO alloy substrate and a preparation method of the multifunctional composite coating system. The multifunctional composite coating system comprises the PA / PPO alloy substrate, a conductive transition layer and a functional coating, the conductive transition layer is coated on the surface of the PA / PPO alloy substrate, and the functional coating is coated on the surface of the conductive transition layer; wherein the conductive transition layer is a formula layer containing a conductive filling piece, the functional coating comprises a self-repairing finishing coat and an antibacterial and antistatic dual-functional coating, the surface of the conductive transition layer is coated with the self-repairing finishing coat, and the surface of the self-repairing finishing coat is coated with the antibacterial and antistatic dual-functional coating. The problems that an existing PA / PPO alloy coating is weak in interface bonding, single in function, insufficient in self-repairing performance, poor in conductivity and antistatic synergism and the like are solved, and the PA / PPO alloy coating is suitable for the high-end fields of electronic equipment, medical instruments, automobile parts and the like and has important practical value.

This invention provides a device and method for magnetic field-assisted plasma modification of laser cladding coatings under ultra-high pressure. A nickel-based alloy substrate is placed in a sealed working chamber. Inert gas is continuously injected into the sealed working chamber to maintain an ultra-high pressure environment. A molten pool is formed by laser irradiation of nickel-based alloy powder deposited on the surface of the substrate. Simultaneously, metal plasma is used as an element dopant in the nickel-based alloy coating. The metal plasma is sprayed onto the surface of the nickel-based alloy substrate, and the plasma-state active element dopant accumulates on the surface of the molten pool under the control of a magnetic field. Under the synergistic effect of the ultra-high pressure environment and the alternating magnetic field, the metal plasma penetrates into the molten pool and reacts with the molten material, resulting in a nickel-based alloy cladding coating with uniform active element doping. This invention achieves effective doping of the active element Hf into the nickel-based alloy coating, improving the coating's high-temperature resistance.

The invention discloses a nanocrystalline NiTi shape memory alloy and a preparation method thereof, and the nanocrystalline NiTi shape memory alloy comprises an alloy substrate; the gradient structure layer is formed on the alloy substrate; a gradient structure in the gradient structure layer is a structure which transits from a surface layer amorphous state to an internal nanocrystalline state; and the oxide ceramic layer is formed on the gradient structure layer. According to the nanocrystalline NiTi shape memory alloy provided by the invention, the oxide ceramic layer is combined with the alloy substrate, so that plowing and adhesion effects in a friction process can be directly resisted by virtue of ultrahigh hardness and chemical stability of the nanocrystalline NiTi shape memory alloy, and the nanocrystalline NiTi shape memory alloy becomes a first barrier for wear-resistant protection. And the gradient structure is transited from a surface layer amorphous state to an internal nanocrystalline state. According to the structure, the surface hardness is remarkably improved, and performance mutation between the surface layer and the substrate is relieved by means of the gradient distribution characteristic.

The present application provides a kind of micro-nano heterogeneous polycrystalline diamond compact and its preparation method, drill bit.The micro-nano heterogeneous polycrystalline diamond compact includes hard alloy substrate and micro-nano heterogeneous polycrystalline diamond layer arranged on the hard alloy substrate;Wherein, micro-nano heterogeneous polycrystalline diamond layer includes micron diamond microcrystal and nanometer polycrystalline diamond microcrystal.The micro-nano heterogeneous polycrystalline diamond compact introduces the internal structure for nanometer polycrystalline diamond into the traditional polycrystalline diamond layer to replace the original part of micron diamond, can reduce the cobalt content in polycrystalline layer, improve the heat resistance of compact, in addition, since the nanometer polycrystalline diamond with higher hardness, toughness than traditional micron diamond is added, the hardness, wear resistance and impact resistance of polycrystalline diamond compact are improved.

The invention relates to a heat treatment method of an alloy for manufacturing a golf club head, which comprises the following steps of: forming a club head semi-finished product by using an alloy base material which comprises the following components in percentage by weight: 0.22-0.27% of carbon, 0.6-1% of silicon, 0.3-0.7% of manganese, 0.05-0.27% of nickel, 16.4-17.4% of chromium, 0.1-0.3% of molybdenum, 0.1-0.3% of copper, the balance of iron and inevitable impurities; the rod head semi-finished product is subjected to solution treatment for 60-120 minutes at the temperature of 1000-1060 DEG C; and carrying out tempering treatment on the rod head semi-finished product subjected to the solution treatment, namely heating the rod head semi-finished product subjected to the solution treatment to 650-865 DEG C, maintaining the temperature for 90-240 minutes, and cooling the rod head semi-finished product to below 90 DEG C by using a tempering medium. The angle of the golf club head is easy to adjust.

The application discloses a method for improving the mechanical property of a titanium alloy ring forge piece and a ring forge piece prepared by the method, and belongs to the field of titanium alloy forging technology. The method for improving the mechanical property of the titanium alloy ring forge piece comprises the following steps: preparing a titanium alloy base material, heating the titanium alloy base material to 30-35 DEG C below a phase transition point, performing upsetting treatment to obtain an upset rod; heating the upset rod to 35-40 DEG C below the phase transition point, using a core shaft to perform punching forming to obtain a punched ring forge blank; heating the punched ring forge blank to 30-35 DEG C below the phase transition point, adopting a mandrel expanding method to perform expanding forming to obtain an expanded ring forge blank; heating the expanded ring forge blank to 40-45 DEG C below the phase transition point, performing radial-axial composite rolling to obtain a rolled piece; and performing annealing treatment on the rolled piece to obtain a target ring forge piece.

A coated member has, on a Fe—Co-based alloy base material, a baked coating of magnesium oxide having a lattice constant of 4.20-4.23 Å.

The invention relates to the technical field of semiconductor devices, in particular to a wafer and a preparation process thereof, and a laser device and a preparation process thereof, the wafer comprises a P-surface electrode, a substrate, a metal reflective layer, an epitaxial layer and an N-surface electrode which are stacked; a CuSiC alloy base plate is adopted as the substrate; and the epitaxial layer is an AlGaInP epitaxial layer after the original substrate is removed, and is bonded on the metal reflective layer. According to the technical scheme provided by the invention, the substrate adopts the CuSiC alloy substrate and is provided with the metal reflective layer, so that the LED lamp has the advantages of high luminous efficiency, high percent of pass and low manufacturing cost.

The drill bit comprises a drill bit body, a plurality of cutting teeth and at least one jet tooth, the drill bit body is provided with a hard alloy base body and a composite layer located on the top face of the hard alloy base body, a through drilling fluid flow channel is formed in the hard alloy base body, and an inlet of the drilling fluid flow channel is located in the bottom face of the hard alloy base body; the lateral outlet is formed in the cylindrical surface of the hard alloy substrate and completely avoids the composite layer; the installation direction of the jet teeth meets the condition that the projection of the central axis of the lateral outlet on the plane where the tooth distribution crushing line of the drill bit is located coincides with the normal of the tooth distribution crushing line of the drill bit at the installation point. The cooling device has the advantages of cooling precision, structure strengthening and toughening and high compatibility.

The invention provides an anti-erosion high-wear-resistance aluminum alloy and a preparation method of a TiN film on the surface of the aluminum alloy, relates to the technical field of aluminum alloy surface treatment, and aims to solve the problem that the performance of an aluminum alloy matrix is affected in the TiN film deposition process. The preparation method of the TiN film on the surface of the aluminum alloy is characterized by comprising the steps that a transition layer is deposited on an aluminum alloy substrate, and a Ti / TiN multilayer film is deposited on the transition layer; in the transition layer deposition process, the temperature of the aluminum alloy matrix is reduced after each time of deposition; the step of depositing the Ti / TiN multilayer film comprises the step of depositing TiN, and the temperature of the aluminum alloy matrix is reduced after the TiN is deposited. The method can reduce and even eliminate the influence on the performance of the aluminum alloy matrix in the film deposition process.