143 results about "Boriding" patented technology

The invention relates to the field of high-temperature anti-oxidation coatings, in particular to a tantalum-tungsten alloy surface high-temperature anti-oxidation composite coating and a preparation method thereof.The coating is composed of two layers of coatings with different components, the thermal expansion coefficients of the coatings and a base body are matched, the thermal expansion coefficients of the coatings are matched, and residual stress and thermal stress are reduced. The coating is prepared by adopting an embedding boriding and slurry melting method, and the used material components comprise ZrB2, MoSi2, 8YSZ, B, La2O3, Al2O3, NaF, TaSi2 and the like. The preparation method specifically comprises the following steps: putting a substrate into embedding powder for boronizing treatment, then mixing a coating material with ethanol and a binder, putting the mixture into a ball mill for wet mixing to prepare coating slurry, spraying the coating slurry on the surface of the substrate, and putting the substrate into a vacuum tube furnace for sintering to prepare a coating, thereby obtaining the high-temperature anti-oxidation composite coating. The binding force between the developed coating and the tantalum-tungsten alloy matrix is strong, and the tantalum-tungsten alloy matrix can be protected from oxidation corrosion or the oxidation rate can be slowed down within 500-2500s at the high temperature (2000 DEG C or above).

The invention provides a modified lithium iron manganese phosphate positive electrode material, a preparation method thereof and a lithium ion battery, and relates to the technical field of lithium ion battery materials. The positive electrode material comprises a phosphorus source, an iron source, a manganese source, a lithium source and a magnesium source. Mixing a titanium source solution, carrying out hydrothermal reaction, centrifugally washing and drying to synthesize the lithium manganese iron phosphate, and coating polypyrrole and a glucose carbon layer to improve the electronic conductivity of the lithium manganese iron phosphate. The magnesium-titanium co-doped stable crystal structure is introduced, the lithium ion diffusion path is shortened, the dissolution of the manganese element is inhibited, the structural change in the charging and discharging process is reduced, the side reaction with the electrolyte is inhibited by coating the cobalt boride, and the electrochemical performance of the lithium manganese iron phosphate is improved. The primary nano-particles improve ionic conductivity, and the secondary nano-particles are nano-particles formed by assembling the primary nano-particles and have the advantages of being good in rate capability, high in compaction density and high in tap density.

The invention provides an Al-Si series die-casting aluminum alloy based on secondary aluminum, a preparation method of the Al-Si series die-casting aluminum alloy and a structural part. The method comprises the following steps: adding industrial silicon, steel scrap and Ni into a secondary aluminum melt to obtain a mixed melt; carrying out boronizing treatment and primary refining treatment on the mixed melt; the temperature is adjusted to 710-780 DEG C, magnesium alloy waste, Sr and Al-Ti-B alloy are added, and then secondary refining treatment is conducted; and the mixed melt is subjected to die-casting treatment, and the Al-Si series die-casting aluminum alloy based on the secondary aluminum is obtained. The high-strength aluminum alloy material comprises the following components in percentage by mass: 6%-12% of Si, 0.1%-1% of Fe, 0.4%-3% of Mg, 0%-0.1% of Sr, 0%-0.3% of Ti, 0%-0.05% of B and 0%-2.5% of Ni.

The invention relates to the technical field of metal surface treatment, in particular to a method for achieving titanium metal surface rapid boronizing through electric field induction nanometer assembly in molten salt, titanium dioxide powder, boron powder, inorganic salt and a nanometer particle wrapping agent are evenly mixed, and the molten salt containing nanometer TiB2 is obtained after heating reaction. Graphite and a titanium metal part are put into molten salt containing nano TiB2, the graphite serves as a positive electrode, the titanium metal part serves as a negative electrode, the surface area ratio of the positive electrode to the negative electrode is (3-10): 1, the nano TiB2 in the molten salt is assembled on the surface of the titanium metal part under the action of an electric field to form a boronizing layer, and the boronizing speed is 60-500 microns / h. Compared with an existing high-temperature boronizing technology with active boron atoms as a constituent unit, the high-temperature boronizing technology has the advantages that the boronizing speed can be remarkably increased, the high-temperature boronizing treatment time of titanium metal is shortened, energy is saved, cost is reduced, and meanwhile the negative influence of the high-temperature environment on the organization structure and the mechanical property of a titanium metal part is eliminated.

The invention discloses a heat treatment process of an alloy drill bit, which belongs to the field of alloy and comprises the following steps: S1, after the alloy drill bit is primarily machined and formed, carrying out vacuum pretreatment, heat preservation and heating; s2, the drill bit is rapidly transferred into a sectional temperature control carburizing furnace to be subjected to main carburizing treatment, the temperature is controlled between 930 DEG C and 960 DEG C, the carburizing time ranges from 3 hours to 4 hours, and the carburizing depth is controlled between 0.3 mm and 0.6 mm; s3, after carburizing is completed, subarea multi-speed cooling is carried out, quenching is carried out for 20 seconds at the temperature of 850 DEG C or above, controlled cooling is carried out for 60 seconds within the range of 550 DEG C to 650 DEG C, slow cooling is carried out for 80 seconds at the temperature of 200 DEG C or below, and a refined martensite complex phase structure is obtained; s4, after cooling is completed, double-section tempering treatment is carried out; and S5, performing ultrahigh-pressure static boriding diffusion treatment. The method has the beneficial effects that the processing uniformity, the structure stability, the wear resistance and the corrosion resistance of the alloy drill bit are effectively improved and the service life of the alloy drill bit is effectively prolonged by adopting staged temperature control, different cooling media and a directional quenching technology.

The invention relates to the field of furnace lining materials, in particular to a rapid repairing material for a tapping hole and a furnace lining of an intermediate frequency furnace. The rapid repairing material comprises the following components in parts by weight: 50-70 parts of tabular corundum, 10-20 parts of fused magnesite, 8-15 parts of alumina micro powder, 3-8 parts of nano zirconia, 5-12 parts of silicon carbide, 10-15 parts of silica sol and 2-5 parts of a reinforcing agent. Wherein the reinforcing agent is titanium calcium aluminate coated with chromium nickel boride. The tabular corundum is mainly used as an integral framework; the fused magnesite is matched with the alumina micro powder to form magnesium aluminate spinel with a high melting point; the nano zirconium oxide can fill pores and is excellent in toughness; the silicon carbide has the advantages of high hardness, high thermal conductivity and high melting point; the reinforcing agent is titanium calcium aluminate coated with chromium nickel boride, although the adding amount is small, the high-temperature strength, toughness and thermal shock resistance of the repairing material can be remarkably improved, and especially the long-term corrosion resistance can be remarkably improved.

The invention belongs to the technical field of conductor materials, and particularly relates to a creep-resistant high-strength high-conductivity aluminum alloy conductor material and a preparation method and application thereof. In the preparation process of the creep-resistant high-strength high-conductivity aluminum alloy conductor material provided by the invention, Be, Mo, Co and the like are introduced into the aluminum alloy conductor material through the intermediate alloy, and AlB3 is used for boronizing treatment; meanwhile, an expansion extrusion process is introduced between aluminum alloy continuous casting and continuous rolling processes, pre-aging treatment is carried out after solid solution heat treatment, and final aging treatment is carried out after drawing treatment; the components and the preparation process of the aluminum alloy conductor material are improved, the comprehensive performance such as conductivity, creep resistance and strength is remarkably improved, the comprehensive performance requirements of new energy automobiles on aluminum alloy conductors can be met, and the technical problem that in the prior art, the comprehensive performance of the aluminum alloy conductor material is poor is solved.

The invention relates to the technical field of metal material surface strengthening and modification, in particular to a preparation method and process of a titanium alloy laser cladding cobalt-based wear-resistant coating. The invention provides a titanium alloy surface laser cladding cobalt-based wear-resistant coating which takes titanium or a titanium alloy as a base material, comprises the following components in percentage by weight: 40-50% of cobalt (Co), 30-40% of tungsten carbide (WC), 10-15% of chromium (Cr), 1-5% of lanthanum hexaboride (LaB6), 2-5% of silicon (Si) and 0.5-3% of calcium fluoride (CaF2), and has the beneficial effects of improving wear resistance, high-temperature stability, corrosion resistance, high hardness, high bonding strength, difficulty in cracking and the like.

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.

The invention discloses a preparation method of a nickel-iron alloy composite electrode suitable for electrocatalytic cracking of alkaline seawater and a product. The preparation method comprises the steps of surface treatment of a nickel-iron alloy sheet and preparation of a boronized nickel-iron alloy sheet composite electrode. According to the method, the marketed NiFe alloy sheet is directly subjected to thermal boronizing treatment and is directly subjected to electrochemical oxidation to prepare the multi-chromatography oxygen electrode, and various requirements of an anode material for seawater decomposition can be met. The prepared multi-layer oxygen electrode is mainly composed of a surface oxide layer, an alloy middle layer and an alloy substrate layer. The NiFeB alloy layer on the surface plays a role of a catalytic active layer, the NiFeB alloy layer in the middle plays a role of a corrosion-resistant layer, the NiFe alloy layer on the substrate plays a role of supporting, and the electrode material is efficiently supported by multiple layers together, so that the electrode material has a rapid electron transfer process, and the electrode material can show relatively high catalytic activity. The electrode material is cheap in raw material source and simple in preparation process, and has a relatively strong commercial application prospect.

The invention provides a high-compaction coated modified lithium manganese iron phosphate positive electrode material as well as a preparation method and application thereof, and relates to the field of lithium ion battery materials. The positive electrode material is prepared by the following steps: mixing a phosphorus source, an iron source, a manganese source, a magnesium source, a titanium source, a cobalt source, a lithium source, a carbon source and a dispersing agent, grinding, performing spray drying, and performing primary sintering to prepare a lithium manganese iron phosphate semi-finished product; the preparation method comprises the following steps: uniformly mixing a lithium manganese iron phosphate semi-finished product with tungsten boride, carrying out three-stage grinding including coarse grinding, coarse and fine grinding and fine grinding, carrying out batch mixing on the ground reduced slurry according to different volume ratios to improve the compaction density of the material, uniformly mixing the slurry, carrying out spray drying, and carrying out high-temperature sintering to obtain the lithium manganese iron phosphate composite material. And carrying out airflow crushing and sieving to obtain the high-compaction coated and modified lithium manganese iron phosphate positive electrode material. After tungsten boride and lithium manganese iron phosphate are coated, chemical acting force is formed on the surface, the polarization phenomenon is remarkably weakened, and the positive electrode material shows good long-term cycle stability.

The invention discloses an extrusion-molded magnesium oxide tube and a processing technology thereof, and relates to the technical field of functional ceramics, and the processing technology comprises the following steps: mixing magnesium oxide and inorganic auxiliary materials, and carrying out ball milling; adding a binder, carrying out extrusion molding, and sintering to obtain a magnesium oxide tube; the inorganic auxiliary material is a mixture of aluminum oxide and titanium boride in a mass ratio of (0.5-3.0): 1. According to the invention, by adding the inorganic auxiliary material, alumina and magnesium oxide are subjected to a solid-phase reaction to generate a magnesium aluminate spinel phase, so that the thermal shock resistance, high temperature resistance and thermal conductivity of a sintered product are improved. Introduced titanium boride can react with gas volatile matter generated by sintering of the binder, and cooperates with a sintered product of the binder to form three-dimensional ceramic among magnesium oxide particles, so that the hardness, high temperature resistance and stability of the sintered product are improved, and the heat transfer efficiency of the sintered product is improved.

The invention provides a high-toughness high-thermal-conductivity die-casting aluminum alloy, a preparation method thereof and a structural part. The method comprises the following steps: adding industrial silicon and steel scrap into a secondary aluminum melt to obtain a mixed melt; boronizing treatment and refining treatment are carried out; magnesium alloy waste, Sr, RE, Cr, Zn and Al-Ti-B alloy are added into the mixed melt, refining treatment and die casting treatment are conducted, and then the aluminum alloy is obtained. The invention relates to a high-strength aluminum alloy, which comprises the following components in percentage by mass: 6 to 11 percent of Si, 0.05 to 0.8 percent of Fe, 0.2 to 3 percent of Mg, 0.001 to 0.1 percent of Sr, 0 to 0.2 percent of RE, 0 to 0.3 percent of Ti, 0 to 0.05 percent of B, 0 to 1 percent of Zn and 0.0001 to 0.5 percent of Cr.

The invention discloses a high-mechanical-property aluminum-based composite material for shielding neutrons and gamma rays and a preparation method of the high-mechanical-property aluminum-based composite material for shielding the neutrons and the gamma rays, 6-series aluminum alloy is used as basic alloy, and tungsten boride with the volume fraction being 9-20% or mixed powder of tungsten and boron with the volume fraction sum being 9-20% is added, so that the high-mechanical-property aluminum-based composite material for shielding the neutrons and the gamma rays is obtained. The preparation method comprises the following steps: weighing raw material powder, putting the weighed raw material powder into a stainless steel tank, adding a ball milling medium and a lubricant, putting the obtained raw materials into the stainless steel tank, putting the stainless steel tank on a ball mill, carrying out vacuum ball milling to obtain a mixture, putting the mixture into a graphite mold, and carrying out hot pressing to obtain the high-strength graphite material. And heating and pressurizing in a vacuum environment or a protective atmosphere, carrying out hot pressed sintering under the conditions of heat preservation and pressure preservation, and cooling to room temperature to obtain the compact sintered block of the tungsten-boron-gadolinium-aluminum composite material. The tungsten-boron-gadolinium-aluminum composite material can achieve good neutron and gamma ray shielding at the same time, and has high application value.

The invention discloses a novel antibacterial environment-friendly ceramic and a preparation method thereof, and belongs to the technical field of ceramics, the method comprises the following steps: dissolving aluminum chloride, barium nitrate and ferric nitrate in a solvent, and stirring and mixing to prepare a first mixed solution; adding kaolin and carbon powder into the first mixed solution, and stirring and mixing to obtain a second mixed solution; boron, carbon, aluminum, boron oxide, zirconium dioxide and barium carbonate are dispersed in a dispersing agent to be mixed to prepare a third mixed solution; boron oxide, aluminum hydroxide, titanium boride, zirconium, silicon, sodium zirconate, sodium carbonate, calcium tungstate and zirconium dioxide are added into the second mixed solution to be stirred and mixed, and mixed slurry is prepared; the mixed slurry is used for preparing a blank body, the blank body is placed in a sintering furnace to be sintered in different temperature stages and sintering environments, and the prepared ceramic has high strength, is not prone to cracks in the environment where the temperature changes rapidly and is good in corrosion resistance.

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 discloses a preparation method of zirconium boride-based porous ultrahigh-temperature ceramic, and the method comprises the following steps: obtaining at least two kinds of zirconium boride powder with different particle sizes, mixing the obtained zirconium boride powder, and drying the mixed zirconium boride powder to obtain zirconium boride-based powder; the obtained zirconium boride-based powder is loosely stacked in a sintering container; the sintering container containing the zirconium boride-based powder is sintered in a protective gas atmosphere, and then zirconium boride-based porous ultrahigh-temperature ceramic is obtained. The preparation method provided by the application can quickly prepare zirconium boride-based porous ultrahigh-temperature ceramic, and the prepared zirconium boride-based porous ultrahigh-temperature ceramic has the characteristics of high compressive strength and low thermal conductivity.

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 application provides a modified lithium manganese iron phosphate positive electrode material and a preparation method and a lithium ion battery thereof, and relates to the technical field of lithium ion battery materials. The positive electrode material is prepared by mixing a phosphorus source, an iron source, a manganese source, a lithium source, a magnesium source and a titanium source, and then performing hydrothermal reaction, centrifugal washing and drying to synthesize lithium manganese iron phosphate. The electronic conductivity of the lithium manganese iron phosphate is improved by coating polypyrrole and a glucose carbon layer. The application introduces magnesium and titanium co-doping to stabilize the crystal structure, shorten the lithium ion diffusion path, inhibit the dissolution of manganese elements and reduce the structural changes in the charging and discharging process. The coating of cobalt boride inhibits the side reaction with the electrolyte and improves the electrochemical performance of the lithium manganese iron phosphate. The primary nanoparticles improve the ion conductivity, and the secondary nanoparticles are nanoparticles assembled by the primary nanoparticles, which have the advantages of good rate performance, high tap density and high vibration density.

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.

A method for improving the wear resistance of an alloy surface, belonging to the field of alloy surface treatment, comprises: placing an alloy having a boriding agent layer on its surface in a vacuum environment, heating it to a preset temperature, and performing a boriding treatment while maintaining the preset temperature and pressure; wherein the alloy contains a transition metal element, the preset pressure is 30MPa-60MPa, and the preset temperature is 950°C-1200°C. By subjecting the alloy and the boriding agent layer to boriding treatment at high temperature and high pressure, the wear resistance of the alloy surface can be effectively improved.

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 application belongs to the field of ceramic materials, and particularly relates to a preparation method of a porous titanium boride alloy / hydroxyapatite fluoride composite material. 10 (PO4)6OH 2‑2x F 2x Wherein, x is 0.1-0.6; in the mixture, the weight ratio of TC4, TiB2 and FHA is 86-94:3-7:3-7; the sintering temperature is 1000-1100 DEG C. The application also includes the composite material prepared by the preparation method and the application of the composite material in oral implant materials. The preparation method can realize synergy, improve the strength and biological activity of the material based on the combination of components, proportions and sintering processes.

A hardened slip and a method of making the hardened slip are disclosed. A method of hard surfacing a slip component for a downhole tool is disclosed. The slip component may have a bearing surface and may be composed of a base material, the base material being metallic. The method may comprise steps of positioning at least the bearing surface of the slip component with a direct contact with a boron source; bonding an external layer at least on the bearing surface to form a metallurgical bond between boron from the boron source with the base material by boriding the base material; and maintaining a bulk temperature of the slip component below a melting point of the base material.

The invention provides an aluminum-silicon alloy flux purification and titanium removal process, and belongs to the technical field of alloy refining and purification. According to the method, a two-time flux injection method is adopted, firstly, boron-containing molten salt is added in a first flux injection mode, the yield of the boron element is increased, the boron element is promoted to react with a titanium-containing phase, and the boronizing reaction is fully completed; and secondly, the second flux is blown to adsorb titanium diboride particles generated in the reaction, and the flux adsorbing impurities floats upwards to enter a slag layer and is removed in the subsequent slagging-off operation. Through specific chemical reaction and physical separation means, the titanium element in the aluminum-silicon alloy melt can be effectively removed, and the titanium content is reduced to an ideal range. The technology has the advantages of being easy and convenient to operate, environmentally friendly, capable of saving energy and the like, and a new technical means is provided for purification of the aluminum-silicon alloy.

The invention relates to the technical field of nuclear energy materials, and discloses a 10B-enriched ZrB2 ceramic and a preparation method and application thereof.The preparation method comprises the following steps that ZrO2, H3BO3 and graphite powder are mixed, and a uniformly-dispersed mixed raw material is obtained; sintering the mixed raw material, and grinding and sieving a product obtained after sintering to obtain zirconium boride powder; performing compression molding on the zirconium boride powder obtained in the step S2, and then performing hot pressed sintering; after sintering is completed, cooling is conducted, and the 10B-enriched ZrB2 ceramic is obtained. The density of the ZrB2 ceramic is effectively improved and the mechanical property of the ZrB2 ceramic is enhanced by adopting a hot pressing sintering technology; meanwhile, the failure risk caused by pores or microcracks can be reduced due to the high density; the preparation method disclosed by the invention has the advantages of convenience in operation, low equipment requirement, short preparation period, low preparation cost, easiness in product control and the like, and is suitable for being popularized and used in the industry.

The invention discloses a preparation method of a lanthanum hexaboride / graphene hybrid reinforced Ti2AlNb-based composite material for high-temperature application, and relates to a preparation method of a Ti2AlNb-based composite material. The problems that an existing Ti2AlNb composite material is low in Ti2AlNb heat resistance, poor in plasticity and the like under the high-temperature condition are solved. According to the non-continuous reinforced Ti2AlNb-based composite material and the preparation method thereof, the non-continuous reinforced Ti2AlNb-based composite material is prepared by introducing an in-situ authigenic boride reinforcement body, meanwhile, dispersion strengthening is achieved in the Ti2AlNb composite material through cooperation of high strength of graphene and in-situ authigenic boride (Ti, Nb) B, when the graphene and the (Ti, Nb) B are jointly reinforced, stress is dispersed by the graphene, dislocation movement is hindered by the (Ti, Nb) B, the strength is remarkably improved through the synergistic effect, and the non-continuous reinforced Ti2AlNb-based composite material is obtained. Therefore, by adding the graphene, the interface bonding quality is improved, the stress concentration is reduced, the plastic deformation capacity is improved, the ductility is remarkably improved, and the strength and plasticity of the Ti2AlNb composite material at the high temperature are improved.

The invention belongs to the technical field of dust removal equipment, and particularly relates to a negative pressure dust collection device for a straight wire drawing belt sander, the negative pressure dust collection device comprises a dust collection box and a sealing box door, the inner wall of the dust collection box is fixedly connected with a partition plate, and the upper surface of the partition plate is fixedly connected with a suction fan. The negative-pressure dust collecting device can comprehensively absorb metal dust generated by abrasive belt grinding of a steel wire to be boronized under negative pressure, the situation that the metal dust overflows to pollute the environment and harm the health of workers is avoided, the environment friendliness of the wire drawing process is improved, and the device has the online dust removing function through the pulse cleaning mechanism; two dust collecting cloth bags alternately run, so that the use continuity is improved, meanwhile, the device further has the function of aggregating metal powder into blocks, the situation that secondary pollution is generated due to the fact that the metal powder drifts away again in the discharging process of the metal powder in the device is avoided, and the use reliability and efficiency of the device are improved; and the dust-collecting and environment-friendly effects of the device are improved.

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.