289 results about "Boriding" patented technology

The invention discloses a new method for surface boriding of hard alloy, which sequentially comprises the following steps of: removing an oxidation layer on the surface of the hard alloy; embedding the hard alloy into a solid boriding agent, putting the mixture into a nearly-closed boriding container, and putting the container into an induction heating furnace; vacuumizing the furnace, stopping vacuumizing until the vacuity is over 100 Pa, and filling inert gas or hydrogen; after the gas in the furnace reach the pressure, starting to perform induction heating to reach the boriding temperature of between 800 and 1,300 DEG C, and performing heat preservation for 0.5 to 8 hours to realize gas-solid phase boriding. The solid boriding agent comprises the following components in percentage by weight: 5 to 50 percent of boron supply agent, 2 to 40 percent of activating agent and the balance of fillers, wherein the boron supply agent is one or more of powdered B4C, BN and amorphous boron; the activating agent is two or more of powdered KBF4, NaBF4, NH4BF4, (NH4)2CO3, rare earth oxide and Mg powder, and one of the mixture is an activating agent containing a B element; and the filler consists of graphite powder granules and SiC powder or Al2O3 powder. Through the method, the boriding thickness of sintered hard alloy blank is more than 0.1 millimeter and is close to 1 millimeter, so the surface abrasion resistance of the hard alloy is improved greatly.

A boriding agent for generating boride layers on metallic workpieces, containing boron-releasing substances, activating substances and, in the remainder, refractory, inert extender. The activating substance is a combination of 1 to 5 wt. % potassium tetrafluoroborate and 5 to 40 wt. % calcium fluoride, relative to the total quantity of the boriding agent. With this boriding agent it is possible for single-phase, Fe2B-containing boride layers to be generated on workpieces made of ferrous materials. The agent results in lower emissions of fluorine and fluoride.

The invention relates to a preparation method and a device for an industrial microwave heating diffusion coating. The method uses microwave to directly heat a sealed metal container that is wrapped with absorptive microwave heating material and constantly rolls, and then to indirectly to heat filled powder seeping agent and embedded metal workpieces in the container, and prepares a heat diffusion coating on the surface of the metal workpieces under the mutual and comprehensive action of microwave heat energy, mechanical friction impact medium and seeping agent. Microwave heating material crucially functions as a volumetric source to directly heat the sealed metal container rolling constantly, and can effectively isolate the interaction of the microwave and the metal container to prevent the metal container from reflecting the microwave and causing an arc phenomenon. The method can complete the processes of sherardizing (Zn), aluminizing (Al), zinc/aluminum (Zn/Al) common impregnation and boriding (B), and can be promoted and applied to other powder embedding technologies, effectively shorten chemical treatment and hot treatment time and reduce hot treatment temperature.

The present invention relates to a low temperature boriding process on mild steel surface, belonging to the field of surface heat treatment processing technology. The characteristic of the present invention is nanometerizing steel surface and then low temperature plasma boriding. The process includes the following procedures: 1) mechanical grinding of the surface of mild steel for nanometerization treatment before boriding, 2) charging the mild steel sample after nanometerization treatment in a plasma heat treatment furnace, vacuum pumping up to 40 Pa, starting heating by ion glow between electrodes, adding boriding reagent B(OCH3)3 and blowing the mixed gas of Ar and H2. Operation voltage is 800- 1200 V, the pressure of mixed gas is 400 -1000 Pa, plasma boriding temperature is kept at 500- 650 degree C for 4-8 hours. Then the furnace is cooled down to room temperature, resulting in obtaining surface boriding mild steel. The boriding layer mainly contains Fe2B of crystalline phase with hardness of HV 1700 - 2100.

A method of preparing a titanium-based metal matrix composite. In one form, titanium hydride can be added to substantially pure titanium, an alloying material and a source of boron such that a mixture of these materials can be compacted and sintered in a powder metallurgy process to produce a component made up of a titanium boride reinforced titanium alloy. In another form, the substantially pure titanium, alloying material and source of boron could be vigorously mixed (with or without the titanium hydride) to such an extent that oxide films that may have built up on the titanium precursor can be removed to minimize the presence of oxygen in the manufactured component.

The invention provides a 4 - dihydroxy boryl - L-phenylalanine preparation method which is as follows: reacting amino terminal-protected (S) - 4 -halogeno phenylalanine shown as the formula (I) with a boriding agent and an organic lithium compound to obtain a reaction mixture containing amino terminal-protected (S) - 4 - dihydroxy boryl phenylalanine shown as the formula (II) with R being a protective group; separating the reaction mixture to obtain the amino terminal-protected (S) - 4 - dihydroxy boryl phenylalanine; and de-protecting the amino terminal-protected (S) - 4 - dihydroxy boryl phenylalanine to obtain 4 - dihydroxy boryl - L-phenylalanine.

The invention relates to a molybdenum boride ceramic system hot spray coating material which comprises the following ingredients by mass percentage: 60-80% of MoxBy, 10-30% of Ni or Co, 5-20% of Cr, and 0-5% of WmBn, wherein MoxBy is at least one of MoB or MoB2, and WmBn is at least one of WB or WB2 or W2B5. The molybdenum boride ceramic system hot spray coating material having significant advantages in aspects of thermal erosion resistance, high-temperature skimming wear resistance, molten metal erosion resistance and the like is prepared via unique raw material selection and proportion, as well as corresponding technical steps and parameter limitation, and is particularly applicable to surface hot spraying of spare parts such as sink rolls, stable rolls and shaft sleeves of a garbage incinerator and a hot galvanizing production line.

The invention discloses a composite diamond coating hard alloy cutter mold and a preparation method thereof. The surface layer of the hard alloy cutter mold is provided with composite coatings composed of boron-doped or non-boron-doped micron-crystal diamonds and nanocrystalline diamonds which are alternately arranged, and a layer of diamond-like coating DLC is deposited on the surface of each composite diamond coating. The preparation method comprises the steps of oil removal and degreasing, chemical micro-etching, plasma activation, plasma enhanced gaseous boronizing, plasma cleaning, diamond slurry ultrasonic grinding, nano-scale and micron-diamond seed crystal planting, and vapor-phase deposition of the diamond composite coatings. According to the method, boron atoms enter diamond crystal lattices by doping boron in the diamond deposition process, the internal stress of the diamond coatings is adjusted, and the generation of a stress sudden change region is avoided, so that the situation that the stress of each layer is not matched is avoided fundamentally, the stress distribution inside the composite coatings is effectively improved, the integrity of the micro-nano composite coatings is further improved, the substrate-film binding force is improved, and the comprehensive mechanical property of the composite coatings is improved.

The present invention relates to one kind of low temperature solid boriding agent and its usage. The solid boriding agent consists of ferroboron 5-50 wt%, urea 3-30 wt%, RE compound 1-20 wt%, KBF4 5-40 wt%, charcoal 5-20 %, and silicon carbide for the rest. The RE compound is compound of La, Ce, Tb or Yt. When the low temperature solid boriding agent is used, is adopted a two-section heating process including the first heating to 500-600 deg.c and maintaining for 1-5 hr, the subsequent heating to 630-750 deg.c and maintaining for 2-8 hr and cooling in the furnace to obtain borided layer. The present invention has low boriding temperature, less deformation in the borided layer, improved borided layer performance and simplified process.

The invention relates to a carbon steel boriding medium and a preparation method thereof. The carbon steel boriding medium is composed of the following materials in percentage by weight: 25% of borax, 8% of sodium fluoroborate, 22% of clay, 7% of urea, 6% of ferrosilicon, 4% of ammonium bicarbonate, 1.0% of alumium, 0.002% of titanium dioxide, 0.3% of rare earth fluoride and the balance of graphite and charcoal by weight percentage. According to the technical proposal provided by the invention, the dosage of the rare earth is reduced and the boriding effect is improved.

The invention relates to a quick formation method of a titanium-based composite material having a bionic shell structure. By mainly using a titanium wire and a boriding titanium wire as raw materialsand utilizing double wire feeding mechanisms, alternate deposition on the boriding titanium wire and the titanium wire is carried out through an electronic beam fused deposition technology. Accordingto the quick formation method of the titanium-based composite material having the bionic shell structure disclosed by the invention, the titanium-based composite material having the bionic shell structure, prepared by mixing a net structure and a layered structure, can be obtained; and the titanium-based composite material is high in toughness. Moreover, the process has the advantages of strong applicability and short technological processes, and in addition, preparation and application ranges of the titanium-based composite material are greatly widened.

The invention provides wide-temperature-range low-loss ferrite and a preparation method thereof, and relates to the technical field of ferrite processing. The wide-temperature-range low-loss ferrite is prepared from the following raw materials in parts by weight: 90-100 parts of ferric oxide, 12-18 parts of nano titanium dioxide, 18-22 parts of magnesium oxide, 6-12 parts of barium oxide, 52-60 parts of manganese dioxide, 6-8 parts of a first mixture and 0.8-1.2 parts of a second mixture, wherein the first mixture is a mixture of chromium sesquioxide, tungsten trioxide, copper oxide and zinc oxide in a mass ratio of 3: 1: 4: 12, and the second mixture is a mixture of lanthanum hexaboride, cerium oxide and ammonium tungstate in a mass ratio of 2: 1: 1. The preparation method overcomes the defects of the prior art, effectively solves the problem of high loss of the traditional ferrite under the conditions of wide temperature and high frequency, effectively saves energy, and is suitable for various environments and fields.

The invention relates to a production method of a superfine carbon steel wire. The production method is characterized in that the production process of the production method comprises the following steps of: coiling raw materials; pickling, and boronizing; carrying out dry type drawing for the first time; carrying out heat treatment; carrying out the dry type drawing for the second time; carrying out the heat treatment; electrogalvanizing; drawing a water tank; and winding a finished product. The production method disclosed by the invention can be used for producing the superfine carbon steel wire which has the advantages of high strength, low stress and good straight-through property in a batched way.

The invention discloses a metal boride water-splitting catalyst, a preparation method and an application of the catalyst in electro-catalytic water splitting and belongs to the technical field of preparation of an electrocatalyst. The metal boride water-splitting catalyst is prepared with a solid-phase boriding method, transition metal is coated with a solid boriding agent, and boriding treatmentis performed through temperature programming heating. The boriding agent is prepared from a necessary boriding medium and an unnecessary filling agent. Compared with liquid boriding, a solid boridingmethod has the advantages that the surface clearing difficulty is low after boriding, requirements for equipment are low, and the method is applicable to boriding treatment of various transition metals. The catalyst has very good intrinsic catalysis activity and stability performance under the alkaline condition, and the required potential is 300-400 mV when the current density is 10 mA cm<-2>; the electro-catalytic water splitting oxygen evolution stability can be as long as at least 100 h while the performance is not attenuated, and the catalyst can replace noble metals to promote commercialapplication of electro-catalytic water splitting.

The invention relates to a boronizing method of integration of a pumping tube coupling and a pumping rod collar, which is characterized in that the tube coupling is used as a container for containing a boronizing agent, the rod collar is used as a mandrel for reducing heat capacity and increasing cooling rate during the cooling process, the rod collar is placed in the middle of the boronizing agent inside the tube coupling and heated by high temperature. The ingenious conception of the method can ensure that the tube coupling can reach higher tensile properties, the effects of anticorrosion and wear-resistance are much better than the rod collar and tube coupling made by common heat treating method, and the same amount of boronizing rod collars can be produced when the boronizing tube couplings are being made, thus increasing the production efficiency significantly, reducing the amount of boronizing agent used and decreasing the cost greatly. The hardness of the inner surface of the tube coupling and the outer surface of the rod collar obtained through the methods is HV 1100 to 1600, the thickness of the boronizing layer is 50 Mum to 90 Mum, the yield strength of the tube coupling is more than 552 MPa, the tensile strength is more than 689 MPa, and the elongation is more than 16 percent.

The invention belongs to the technical field of aluminum alloys, and discloses a high-thermal-conductivity die-casting aluminum alloy material produced from secondary aluminum and a preparation method thereof. The high-thermal-conductivity die-casting aluminum alloy material is characterized in that (1) used materials are mainly reclaimed materials; (2) main components of an aluminum alloy comprise Si, Mg, Fe, Sr, B and Al, and the aluminum alloy comprises the following components including, by mass, 7.0%-11.0% of the Si, 0.3%-1.0% of the Mg, 0.6%-0.90% of the Fe, 0.02%-0.06% of the Sr, less than or equal to 0.03% of the B and the balance of the Al; (3) a smelting furnace is provided with double gates; and (4) in the production process, boronizing treatment is adopted, the standing time is prolonged, elements influencing the heat conductivity are settled to the bottom of the furnace in a boride form, and molten aluminum purification is achieved.

The invention relates to a magnesium-rare earth-boron alloy with high heat resistance. The chemical formula is Mg-xRE-yB, wherein RE represents one or more of 17 rare earth elements. When many rare earth elements coexist, the mass fractions of the rare earth elements are equal; x and y are mass fractions, x is greater than or equal to 7% but less than or equal to 12% while y is greater than or equal to 0.05% but less than or equal to 3%. The preparation method provided by the invention mainly comprises the following steps: carrying out surface pre-treatment on a magnesium-rare earth alloy; grinding, polishing and cleaning; wrapping the magnesium-rare earth alloy by boron nitride through a cold press; assembling to a high-pressure test sample; placing the sample in a high-pressure cubic press for high-pressure boriding to obtain the magnesium-rare earth-boron alloy comprising a boron-rare earth compound. The method provided by the invention is simple and easy to control, and low in cost. The high-pressure boriding process is safe and non-toxic so as to avoid the environmental pollution caused by harmful gases. The prepared magnesium-rare earth-boron alloy can be used for a long time at a temperature of 300 DEG C.

The invention relates to a heat treatment process of an aluminum alloy extrusion die. The heat treatment process comprises the steps of machining, boriding, quenching, tempering, cleaning and tufftriding, specifically, firstly, an aluminum alloy extrusion die material is machined firstly; then the surface of the aluminum alloy extrusion die is decontaminated, after decontamination treatment, the aluminum alloy extrusion die is placed into a stainless steel container with a cover, the space between the inner side of the stainless steel container and the outer side of the aluminum alloy extrusion die is filled with boriding powder, the space between a cover body of the stainless steel container and a stainless steel container body is sealed through refractory mortar, finally the stainless steel container is placed into a furnace to be heated to 900 DEG C for heat preservation for 2-4 h, then furnace cooling is conducted to the room temperature, and the die is taken out; then the die issubjected to heat treatment, namely vacuum quenching and three-time tempering, and then oil contamination cleaning is conducted; and finally, the cleaned aluminum alloy extrusion die is placed into anitriding furnace to be tufftrided. According to the heat treatment process, the performance such as hot melt loss resistance and adhesion resistance of the aluminum alloy extrusion die is improved.

The invention discloses a boriding agent for boriding on a metallic titanium surface and a preparation method thereof. The boriding agent comprises the following ingredients in mass percent: 20-35% of Na2B4O7, 10-20% of H3BO3, 10-20% of B4C, 15-25% of KCl, 15-25% of NaCl, and 1-5% of KBF4. The boriding technique of the invention comprises the steps of: firstly putting a metallic titanium sample in a boriding agent fused mass with special ingredients, maintaining the temperature for a period to form a boriding layer on the surface of the metallic titanium sample; and then, performing a quenching treatment to cure the boriding layer so as to obtain a thick and uniform boriding layer with high hardness and good bonding force on the surface of the metallic titanium sample, and the fused salt on the surface of the metallic titanium sample is easy to treat. The boriding technique of the invention has the advantages of simple and easy control operation, little boriding agent loss, short operation duration and low energy consumption, so that the boriding technique is suitable for industrial production.

The invention discloses a preparation method for anticorrosion steel used for a water-cooling spray nozzle. The method comprises the following steps that raw materials are heated into a molten state to obtain a liquid alloy, wherein the liquid alloy comprises, by weight, 0.1-0.25% of C, 1.2-1.5% of Cr, 0.3-0.6% of Al, 1.2-1.6% of Mg, 0.2-0.3% of Zr, 0.4-0.6% of Ni, 1.2-1.3% of Mn, 0.08-0.12% of Mo, 0.1-0.13% of V, 0.03-0.06% of Co, 0.02-0.05% of Ga, 1.5-1.6% of T, 0.6-0.8% of Si and the balance Fe; a steel billet is obtained through casting; heat treatment is conducted; boriding is conducted; and the steel billet subjected to heat treatment and boriding is coated with a conversion film.

The invention relates to a technique which includes carrying out ball blast on the surface of a mould steel part and then plasma boriding to form a composite layer, belonging to the technical field of steel surface modification heat treatment. The technique is characterized in that: first, carrying out ball blast on the surface of a mould steel part; second, inletting gaseous mixture of BF3, Ar and H2 into heat treatment furnace for carrying out plasma boriding at a low temperature; the temperature for plasma boriding is from 510 DEG C to 610 DEG C , lower than the tempering temperature which is within 580-620 DEG C for general hot-work mould steel, and much lower than the temperature for traditional plasma boriding which ranges from 850 DEG C to 950 DEG C; finally, a composite layer of ball blast layer and boriding layer is formed on the surface of the steel part. The composite layer has the advantages of high hardness and strong rotproofness. As boriding is carried out at low temperature, gross distortion of the steel part under high-temperature treatment is avoided. The invention can prolong the service life of the mould steel.