46 results about "Boriding" patented technology

The invention belongs to the technical field of tungsten alloy, and particularly discloses a tungsten alloy electrode material and a preparation method thereof.The tungsten alloy electrode material comprises, by weight, 0.1%-0.2% of lanthanum boride, 0.2%-0.5% of zirconium oxide, 0.2%-0.6% of boron carbide, 0.4%-0.8% of cerium oxide, 0.5%-1.2% of tantalum carbide, 1.4%-1.8% of modified carbon nanotubes and the balance tungsten powder. The lanthanum boride, the zirconium oxide, the boron carbide, the cerium oxide, the tantalum carbide and the modified carbon nanotubes are added into the tungsten powder, under the combined action of the lanthanum boride, the zirconium oxide, the boron carbide, the cerium oxide, the tantalum carbide and the modified carbon nanotubes, the tensile strength and the electrical conductivity are effectively improved, and the high-temperature stability tungsten powder has excellent high-temperature stability and wide application prospects.

This invention relates to a coating alloy, based on Iron Boride (Fe2B), a powder developed for bonding the surfaces of steels. Coatings made with the powder of this invention, using methods such as fusion or thermal spraying, provide an increase in surface hardness, wear resistance, and corrosion resistance of metallic materials, especially steels, and therefore represent a significant alternative to bonding through thermochemical methods. The alloy powder developed in this invention essentially contains iron (Fe) and boron (B) elements, with a boron (B) content between 7.1 % and 10% by weight.

The application relates to the technical field of ceramic materials, in particular to a boron carbide composite ceramic material and a preparation method and an etching component thereof. The preparation method comprises the following steps: forming granular materials containing boron carbide, titanium boride and silicon carbide, the granular materials have a spherical structure, the mass proportion of the boron carbide in the granular materials is 70%-90%, the mass proportion of the titanium boride is 5%-25%, and the mass proportion of the silicon carbide is 5%-25%; and the granular materials are sequentially subjected to pre-sintering and hot-press sintering to prepare the boron carbide composite ceramic material; wherein the temperature of the pre-sintering is 1200 DEG C-1500 DEG C. The application can promote the three-dimensional communication growth of sintering necks in the hot-press sintering process, effectively improve the material density, ensure the good uniformity of the material, and synergistically improve the etching resistance of the boron carbide ceramic material.

The invention belongs to the technical field of preparation of green special fire-resistant ceramics and functional coatings for continuous casting, and provides a special fire-resistant anti-adhesion ceramic coating for a boron nitride side sealing plate for thin-strip continuous casting and a preparation method of the special fire-resistant anti-adhesion ceramic coating. The preparation method comprises the following steps: forming a hollow structure by taking polymer microspheres as a template, dipping in a cerium salt solution and sintering; preparing coated zirconium boride, mixing zirconium boride with silicon dioxide powder, depositing an aluminum phosphate protective film on the surface of the mixture, and performing heat treatment and curing; compounding the boron nitride sheets and the silicon carbide nanowires, and performing surface treatment to obtain a mixed reinforcing material; the materials are prepared into three-layer slurry with a gradient function, then the boron nitride side sealing plate base body is coated with the bonding layer, the functional layer and the working layer in sequence, low-temperature pre-sintering is conducted on the multi-layer structure, and finally rapid densification of the coating is achieved through the spark plasma sintering technology. And constructing a special fire-resistant anti-adhesion functional layer taking an inorganic ceramic phase as a main body.

This invention relates to the field of welding electrodes for duplex stainless steel, specifically to a welding electrode for duplex stainless steel and its preparation method. When residual stress at the weld seam of 2209 duplex stainless steel is eliminated through high-temperature heat treatment, the mechanical properties and corrosion resistance of the weld seam significantly decrease. To address the above technical problem, this invention provides a welding electrode for duplex stainless steel that effectively slows down the phase transformation rate during high-temperature heat treatment, avoids excessive austenite formation, and maintains the balance of the duplex structure. The electrode coating composition specifically includes lanthanum hexaboride and Ti-6Al-4V alloy, which have grain-refining effects and simultaneously inhibit the precipitation of harmful intermetallic phases. This effectively suppresses the precipitation of harmful phases such as the σ phase during weld heat treatment, ensures the solid solubility of chromium and molybdenum, and allows the weld seam to retain excellent comprehensive properties after high-temperature treatment.

The present application relates to the technical field of glaze, and particularly relates to a composite zircon white opal frit, a preparation method thereof, super-white glaze using the composite zircon white opal frit and ceramic tile. The raw materials of the composite zircon white opal frit include, in terms of weight parts, quartz 25-40 parts, calcined alumina 5-10 parts, potassium feldspar 20-35 parts, talc 3-10 parts, calcite 5-10 parts, calcium phosphate 5-10 parts, calcined shell 1-5 parts, zirconium boride 7-15 parts, zirconite sand 3-10 parts, kaolin 1-5 parts and zinc oxide 3-10 parts. The raw materials of the composite zircon white opal frit described above can make the composite zircon white opal frit have a high whitening effect; meanwhile, two cooling and holding processes are adopted in the cooling and holding stage, the content of SiO2, P2O5 and MgO in the chemical composition of the composite zircon white opal frit is adjusted, a large amount of fine needle-like MgSiO3 can be generated, and the opalescence and whiteness of the glaze are improved after the obtained composite opal frit is used in the glaze.

The invention discloses a casting method of a high-strength and high-conductivity aluminum alloy. The casting method comprises the following steps: preparing an aluminum alloy melt; performing refining; a refiner Al-5Ti-1B intermediate alloy is added on line; carrying out on-line ultrasonic treatment on the aluminum alloy melt flowing through the launder entering the filtering device; performing two-stage filtration; and semi-continuous casting is carried out, and online ultrasonic treatment is carried out on the aluminum alloy melt flowing through in a launder of the pouring system. The method has the advantages that the boronizing treatment procedure is omitted, the content of impurities such as Ti, V, Cr and Mn in the cast ingot is remarkably reduced, the cracking phenomenon is remarkably improved, and the grain structure is refined.

The application discloses a melt composite treatment method with the advantages of improving the mechanical properties and heat conduction performance of cast aluminum alloy, which comprises the following steps: carrying out boronization treatment on Al-Si series cast aluminum alloy melt to remove transition elements such as V, Ti and Cr, reduce the solid solubility of the above-mentioned elements in the aluminum matrix, reduce the degree of lattice distortion, and improve the heat conductivity of the alloy; further carrying out heat preservation and liquid transfer treatment on the melt to guarantee the removal effect of the above-mentioned elements; and adding Al-Sr-RE composite modifier with a specific content to modify the eutectic silicon in the alloy. Through the cooperation of the above-mentioned treatment methods, the obtained aluminum alloy has excellent mechanical properties and heat conduction performance, can greatly meet the performance requirements of the market and existing products, and has the significance of wide popularization and application.

The application discloses a kind of biomimetic laminated ballistic ceramic material, including matrix layer and embedded layer composition, it is matrix layer, embedded layer, matrix layer in turn by outside inside alternately stacked composition, wherein matrix layer is by B4C powder, SiC powder, nano additive, binder and plasticizer are made, embedded layer is Al2O3 powder, MgO or titanium boride at least one, hexagonal boron nitride powder, binder and plasticizer are made.The biomimetic laminated ballistic ceramic of the application has the advantages of light weight, high hardness, high toughness, good effect of anti-intensive attack, etc.Cutting after the ceramic sample is handled, and the target sample piece with the face density of about 27.5kg / m 2 The target sample piece is prepared by compounding with ultra-high molecular weight polyethylene fiber plate, 95 type 5.8mm ordinary bullet is carried out, and multiple bullet shooting can be effectively defended, and the highest can be continuously defended 8 bullet shooting, and the application is suitable for the protection demand of various light armored equipment and individual protection equipment to small caliber bullet, and the survival rate in battlefield is improved.

The invention discloses a wear-resistant and corrosion-resistant metal mold and a preparation process thereof, and relates to the technical field of metal molds. The method specifically comprises the following steps that a die steel base body is taken and ground to be flat through a grinding machine, then cleaned and dried through acetone, nitrided and preheated, a transition layer and a functional surface layer are sequentially prepared on the surface of the die steel base body through laser cladding, and finally the abrasion-resistant and corrosion-resistant metal die is obtained through boriding. The transition layer comprises the following raw materials in parts by mass: 40-60 parts of nickel-based alloy, 20-30 parts of cobalt-based alloy, 10-12 parts of carbide and 5-8 parts of oxide; the functional surface layer comprises the following raw materials in parts by mass: 80-100 parts of cobalt-based alloy, 0.3-1 part of modified carbon nanotubes, 4-8 parts of carbides and 0.8-1 part of oxides.

The invention relates to a method including box boriding process to improve some mechanical properties such as hardness, corrosion resistance and wear and to provide 100% antibacterial properties to AISI 316L quality stainless steels, which are among the most widely used and known metals in terms of biocompatibility as implant materials. The invention relates to AISI 316L type biomaterial having 100% antibacterial properties according to antibacterial tests with Escherichia coli ATCC 25922 and Staphylococcus aureus ATCC 29213 bacteria.

The invention belongs to the technical field of ceramic lining plate preparation, and particularly relates to a wear-resistant ceramic lining plate and a preparation method thereof. The wear-resistant ceramic lining plate is prepared from the following raw materials: aluminum oxide, a sintering aid, aluminum titanate, modified urea resin microspheres, hafnium boride, tungsten disilicide and a KH-550 silane coupling agent, and the sintering aid is a mixture of niobium pentoxide, strontium oxide, lanthanum oxide and magnesium oxide. According to the wear-resistant ceramic lining plate, aluminum oxide serves as a main raw material, a mixture of niobium pentoxide, strontium oxide, lanthanum oxide and magnesium oxide serves as a sintering aid, a compound of modified urea-formaldehyde resin microspheres, hafnium boride and tungsten disilicide serves as a reinforcing and toughening phase, aluminum titanate serves as a conditioning agent, and the raw materials have a synergistic effect; and it is ensured that the prepared ceramic lining plate has good wear resistance, hardness and toughness.

The invention aims to solve the problem that the copper SLM printing machinability is poor, so that the performance of the copper SLM is seriously influenced. The preparation method comprises the following steps that S1, material preparation is conducted, specifically, high-purity copper powder and high-purity lanthanum hexaboride powder are mixed, and evenly-mixed powder is obtained; s2, the mixed powder is subjected to additive manufacturing forming through the selective laser melting technology; and S3, linear cutting is conducted, specifically, linear cutting is conducted on the printed lanthanum hexaboride / copper composite material workpiece in a linear cutting mode, and the lanthanum hexaboride / copper composite material is obtained. The preparation complexity and cost of the lanthanum hexaboride / copper composite material are greatly reduced, the prepared lanthanum hexaboride / copper composite material is good in compounding effect, high in strength and toughness and high in conductivity, and new possibility is developed for wide industrial application.

This invention discloses a zirconium boride dispersion-reinforced fine-grained tungsten sintered billet. The billet consists of a tungsten matrix and zirconium boride particles dispersed within the tungsten matrix, exhibiting a dual distribution state of intragranular and grain boundary dispersion. The average grain size of the tungsten matrix is ​​no greater than 40 μm, the average grain size of the zirconium boride particles is no greater than 2 μm, and the relative density of the sintered billet is no less than 94%. A semi-coherent metallurgical bonding transition layer with a thickness of no less than 1.5 nm is formed between the zirconium boride particles and the tungsten matrix. This invention also provides a method for preparing this sintered billet, which involves long-time wet ball milling, short-time dry ball milling, combined with cold isostatic pressing and pressureless sintering. The doped tungsten prepared by this invention achieves uniform dispersion of zirconium boride particles and grain refinement of the tungsten matrix. The process is controllable, the interfacial bonding is excellent, and the prepared sintered billet has a fine microstructure and uniform dispersion of the dispersed phase, overcoming the defects of uneven dispersion of the traditional tungsten reinforcing phase, coarsening of grains, and weak interfacial bonding.

The invention discloses an oxide-doped LaB6 polycrystalline material and a preparation method and application thereof.The preparation method comprises the steps that lanthanum hexaboride and metal oxide are mixed, ball-milled to be uniform and dried to obtain first powder, the metal oxide is an oxide of M, and M is Al, Zr and Ti; the first powder is placed in a mold, the first powder is located in the center of the mold and has the same apparent density, in the inert gas atmosphere, the pressure is increased from the pressure P1 to the pressure P2, heat preservation is carried out for 0.5-3 h at the pressure P2 and the temperature of 1400-2000 DEG C, hot pressing sintering is carried out, cooling is carried out, meanwhile, pressure preservation is carried out for 0-3 h at the pressure P2, the LaB6 polycrystalline material doped with the oxide is obtained, the P1 ranges from 5 MPa to 9 MPa, and the P2 ranges from 20 MPa to 60 MPa. By adding the oxide phase, the sintering temperature of the pure LaB6 ceramic is reduced from 1975 DEG C to 1800 DEG C or below, the conductivity of the LaB6 ceramic is not deteriorated after doping, and the bending strength is effectively improved.

The invention relates to the technical field of high corrosion resistance and wear resistance, and discloses a large-size anti-fatigue titanium alloy impeller forge piece and a machining technology of the large-size anti-fatigue titanium alloy impeller forge piece. Comprising the following steps: uniformly smelting alloy raw materials, and carrying out casting molding; cogging and forging; performing heat treatment to obtain a basic forge piece; after the basic forge piece is cleaned, laser cladding, boriding and magnetron sputtering are sequentially carried out, a corrosion-resistant and wear-resistant layer is formed, and the titanium alloy impeller forge piece is obtained; during laser cladding, mixed alloy powder is used, laser cladding is conducted on the surface of the basic forge piece in a coaxial powder feeding mode, a cladding layer is formed, and a laser cladding alloy material is obtained; and the mixed alloy powder is a composition of Ti, Cr, Ni, SiC, TiB2 and B. Through three-step surface treatment of laser cladding, boriding and magnetron sputtering, a high-wear-resistance and corrosion-resistance layer is formed on the surface of the basic forging, and the impact resistance and the fatigue resistance of the large-size anti-fatigue titanium alloy impeller forging are ensured on the basis of effectively improving the wear resistance and the corrosion resistance.

The application discloses a shielding piece made of a tungsten-based alloy material, a preparation method and application, the tungsten-based alloy comprises a tungsten base and lanthanum hexaboride dispersed in the tungsten base, and the content of boron in the tungsten-based alloy is 0.01wt%-0.5wt%. The tungsten-based alloy in the application introduces lanthanum hexaboride, which is beneficial to the refinement of tungsten grains in the tungsten-based alloy, enhances the toughness of the tungsten-based alloy, reduces the ductile-brittle transition temperature, and improves the absorption capacity of the tungsten-based alloy to neutron irradiation; meanwhile, the introduction of the lanthanum hexaboride does not reduce the heat conduction performance of the tungsten base, but helps to improve the heat conduction performance of the material, which is all beneficial to the improvement of the service life of the shielding piece.

This invention belongs to the field of aluminum alloy conductive material preparation technology, and discloses an 8030 aluminum alloy wire and its preparation process. The composition and mass percentage of the 8030 aluminum alloy are: Fe 0.6-0.75%, Cu 0.2-0.25%, Ce 0.05-0.3%, B 0.001-0.04%, Zn 0.01-0.05%, Mg 0.003-0.005%, Si≤0.1%, impurity element content≤0.05%, and the balance is aluminum. This invention achieves a synergistic increase in conductivity, tensile strength, and elongation of the 8030 aluminum alloy through multi-scale control of alloy composition, boronizing process, and rare earth addition process.

The application discloses a tungsten-boron stainless steel composite material and a preparation method thereof, and relates to the technical field of shielding materials, which comprises a boron-tungsten compound, wherein the boron-tungsten compound particles are dispersed in a stainless steel matrix. The tungsten-boron stainless steel composite material has high density of the dispersed boron-tungsten compound, tungsten is a heavy metal element with stable chemical properties and high gamma shielding efficiency; boron has a high neutron absorption cross section for medium and low energy neutrons, and is a high-efficiency neutron shielding component; the tungsten boride materials of various components have good compatibility with the stainless steel; at the sintering and other hot working temperatures of the stainless steel, the tungsten boride materials do not react with the stainless steel matrix; the boron-tungsten compound is dispersed in the stainless steel matrix, and the composite material prepared by the method has better neutron shielding performance and gamma shielding performance than traditional boron stainless steel.

The invention discloses a ZIF-67 derivative hollow material and a room-temperature boronizing and vulcanizing two-step preparation method thereof. The preparation method comprises the following steps: firstly, synthesizing rhombic dodecahedron ZIF-67 by adopting a room temperature precipitation method, and then in-situ growing CoNi-LDH nanosheets on the surface of the rhombic dodecahedron ZIF-67 by introducing Ni < 2 + > to form a core-shell structure precursor; then boronizing treatment and sulfidizing treatment are sequentially carried out at the room temperature, wherein the boronizing treatment realizes partial selective etching of the material, and a core-shell / hollow coexisting structure is formed; and the sulfuration treatment further completes structure transformation and surface refinement, and finally a complete hollow structure with an ultrafine nanosheet surface is obtained. According to the application of the material as a supercapacitor electrode material, the material is charged and discharged within the range of 0-0.5 V, and when the discharge current density is 1 A g <-1 >, the specific capacitance is 1550-1620 F g <-1 >; and compared with 1 A g <-1 >, the specific capacitance retention rate is 70-80% under the current density of 10 A g <-1 >.

The invention discloses a zirconium boride reinforced beryllium-based composite material and a preparation method thereof, and belongs to the technical field of beryllium-based alloy treatment. The method comprises the steps that S1, zirconium boride powder and beryllium powder are mixed and then subjected to ball milling, and uniform composite powder is obtained; and S2, the uniform composite powder is subjected to cold isostatic pressing, primary sintering, secondary sintering and natural cooling in sequence, and the zirconium boride reinforced beryllium-based composite material is obtained. The zirconium boride reinforced beryllium-based composite material is large in relative density, good in room-temperature plastic deformation capacity, large in room-temperature tensile strength and high-temperature (gt; the strength retention rate at 500 DEG C is high, and the cost is low.

The invention discloses an alumina fiber high-temperature-resistant composite material and a preparation method thereof, and the alumina fiber high-temperature-resistant composite material comprises the following components by mass: 45-60 parts of alumina fiber; 20-35 parts of a modified alumina matrix; 3 to 8 parts of yttrium-doped lanthanum cerate; 2 to 6 parts of titanium boride-silicon carbide composite powder; 1 to 4 parts of lanthanum aluminate-mullite composite ceramic; 0.5-2 parts of a neodymium phosphate interface regulator; 0.3-1 part of a dispersant; 0.2 to 0.8 part of a sintering aid; by adding the four innovative components, the high temperature resistance, the mechanical property and the oxidation resistance of the material are synergistically improved, the prepared composite material can serve for a long time in the high-temperature environment of 1600-1800 DEG C, the breaking strength is larger than or equal to 350 MPa, the breaking tenacity is larger than or equal to 8.5 MPa * m (1 / 2), the oxidation resistance is excellent, and after heat preservation is conducted for 10 hours in the air atmosphere of 1800 DEG C, the service life is long. And compared with the prior art, the performance is obviously improved.

The application relates to a preparation method of a magnesium-carbon refractory material with added titanium boride for enhancing resistance to acid high-titanium slag corrosion, and belongs to the field of refractory materials. The magnesium-carbon refractory material is prepared by taking magnesite and flake graphite as main raw materials and directly introducing titanium boride powder as a functional additive phase. The introduced titanium boride can effectively improve the matrix structure and interface state of the magnesium-carbon refractory material, improve the penetration resistance and chemical corrosion resistance of the material under the action of acid high-titanium slag, and also consider the oxidation resistance and high-temperature service stability of the material. After the magnesium-carbon refractory material is added, the microstructure and interface state of the material can be effectively improved, the penetration and chemical corrosion of the acid high-titanium slag on the material are slowed down; meanwhile, the titanium boride and the magnesium-carbon system synergistically act, which is helpful to improve the structural compactness, slag corrosion resistance and high-temperature service stability of the material, so that the obtained magnesium-carbon refractory material is more suitable for acid high-titanium slag working conditions such as a vanadium and titanium extraction smelting separation furnace, the process flow is simple, and the preparation cost is low.

The invention provides a preparation method of a zirconium boride reinforced molybdenum-based alloy, which comprises the following steps: mixing molybdenum powder and nano zirconium boride powder, and carrying out ball milling, prepressing and two-stage vacuum hot pressed sintering to obtain the zirconium boride reinforced molybdenum-based alloy. A high-temperature ceramic strengthening phase ZrB2 is introduced into the molybdenum alloy, and ZrB2 can pinning a grain boundary and prevent grain boundary migration in the sintering process, so that grains are refined, the grain boundary density is improved, refined grain strengthening is caused, and the average impurity concentration of the grain boundary is reduced; and meanwhile, the secondary phase can react with impurity oxygen in a molybdenum matrix to generate zirconium oxide, the impurity concentration in the alloy is further reduced, dispersion strengthening is caused, and the prepared zirconium boride strengthened molybdenum-based alloy has high compressive yield strength and good high-temperature stability.

The invention belongs to the technical field of copper-based composite materials, and particularly relates to a high-strength, high-conductivity and high-temperature-resistant copper-based composite rod wire with a nano structure and a preparation method thereof. The preparation method comprises the following steps: mixing nanoscale lanthanum hexaboride powder, nanoscale rare earth oxide powder and copper powder to obtain mixed powder, and carrying out plasma-assisted high-energy ball milling on the mixed powder to obtain composite powder; the composite powder is subjected to cold pressing forming, and a green body is obtained; sintering the green body in a reducing atmosphere to obtain a sintered blank; carrying out hot extrusion on the sintered blank to obtain a blank subjected to hot extrusion; continuously extruding the blank subjected to hot extrusion to obtain a wire blank; and the wire blank is sequentially subjected to cold drawing and annealing treatment, and the high-strength, high-conductivity and high-temperature-resistant copper-based composite rod wire is obtained. The high-strength, high-conductivity and high-temperature-resistant copper-based composite rod wire provided by the invention has ultrahigh strength, high electric conductivity and heat conductivity and excellent high-temperature stability.

This invention belongs to the field of ceramic liner preparation technology, specifically relating to a wear-resistant ceramic liner and its preparation method. The wear-resistant ceramic liner is composed of the following raw materials: alumina, sintering aid, aluminum titanate, modified urea-formaldehyde resin microspheres, hafnium boride, tungsten disilicide, and KH-550 silane coupling agent. The sintering aid is a mixture of niobium pentoxide, strontium oxide, lanthanum oxide, and magnesium oxide. The wear-resistant ceramic liner of this invention uses alumina as the main raw material, a mixture of niobium pentoxide, strontium oxide, lanthanum oxide, and magnesium oxide as the sintering aid, a composite of modified urea-formaldehyde resin microspheres, hafnium boride, and tungsten disilicide as the reinforcing and toughening phase, and aluminum titanate as a modifier. The synergistic effect of the raw materials ensures that the prepared ceramic liner has good wear resistance, hardness, and toughness.

This invention discloses a hardened slip component and its preparation method. Specifically, it discloses a method for surface hardening of slip components used in downhole tools. The slip component may have a bearing surface and be constructed of a metallic matrix material. The method may include the following steps: positioning at least the bearing surface of the slip component in direct contact with a boron source; bonding an outer layer to at least the bearing surface by boronizing the matrix material to form a metallurgical bond between boron from the boron source and the matrix material; and maintaining the overall temperature of the slip component below the melting point of the matrix material.

The invention discloses a rare earth compound composite reinforced tungsten filament and a preparation method thereof, the rare earth compound composite reinforced tungsten filament is provided with a tungsten matrix, nanoscale lanthanum oxide and lanthanum boride are dispersed and distributed in the tungsten matrix, and boron elements are segregated at the grain boundary of the tungsten matrix; the tungsten-LaB6 composite material is prepared from 99.2-99.4 wt% of tungsten powder and 0.6-0.8 wt% of LaB6 powder, the average particle size of the tungsten powder is 1.5-2.5 m, and the average particle size of the LaB6 powder is smaller than 500 nm. According to the invention, lanthanum hexaboride (LaB6) is introduced as a single precursor, in-situ chemical reaction is realized in the hydrogen sintering process, and a dual reinforcement mechanism of nanoscale lanthanum oxide particle generation and boron segregation is realized, so that not only is the pain point in the prior art solved, but also a high-performance material is provided for the high-requirement field; wide industrial application prospects and commercial values are realized.