Powder metallurgy products often go far beyond the scope of materials and metallurgy, and are often interdisciplinary technologies (materials and metallurgy, machinery and mechanics, etc.). Among them, pulverization is mainly a metallurgical process, which is consistent with the literal meaning. Due to the advantages of powder metallurgy technology, it has become the key to solve the problem of new materials and plays an important role in the development of new materials.Powder metallurgy includes powder making and products. Therefore, a series of new powder metallurgy technologies can also be used for the preparation of ceramic materials. It belongs to powder sintering technology. Powder metallurgy is similar to the production of ceramics.
Application Of Powder Metallurgy Full Play To(3) It can easily realize various types of composites and give full play to the respective characteristics of each component material. These materials have excellent electrical, magnetic, optical and mechanical properties. (2) A series of high-performance nonequilibrium materials such as amorphous, microcrystalline, quasicrystal, nanocrystalline and supersaturated solid solution can be prepared. It plays an important role in the preparation of high-performance rare earth permanent magnet materials, rare earth hydrogen storage materials, rare earth luminescent materials, rare earth catalysts, high-temperature superconducting materials, new metal materials (such as Al Li alloy, heat-resistant Al alloy, superalloy, powder corrosion-resistant stainless steel, powder high-speed steel, intermetallic compound high-temperature structural materials, etc.). (1) Powder metallurgy technology can minimize alloy composition segregation and eliminate coarse and uneven casting structure. The use of powder metallurgy technology can directly make porous, semi dense or fully dense materials and products, such as oil bearing, gear, cam, guide rod, cutting tool and so on.It is a new technology that can effectively regenerate and comprehensively utilize materials.Many of our common machining tools and hardware abrasives are made by powder metallurgy technology. (6) It can make full use of ore, tailings, steelmaking sludge, steel rolling scale and recycled waste metal as raw materials. (5) It can realize near net formation and automatic batch production, so as to effectively reduce the resource and energy consumption of production. (4) It can produce materials and products with special structure and properties that cannot be produced by ordinary smelting method, such as new porous biomaterials, porous separation membrane materials, high-performance structural ceramic abrasives and functional ceramic materials.In order to improve the formability and plasticity of powder, plasticizers such as engine oil, rubber or paraffin are usually added. The production process of powder includes powder preparation, powder mixing and other steps. (1) Production of powder.Application Of Powder Metallurgy Series Of NewHowever, for some parts with high dimensional accuracy, high hardness and wear resistance, post sintering treatment should be carried out. Generally, sintered parts can be used directly. In the sintering process, powder particles become metallurgical products with certain porosity through a series of physical and chemical processes such as diffusion, recrystallization, fusion welding, combination and dissolution. At least one element is still in solid state during sintering. Sintering is different from metal melting. It is carried out in a high temperature furnace or vacuum furnace with protective atmosphere. Midnight special chords lyricsFor example, when generating a filter, it is required to form powder From the point of view of powder particle size, various particle sizes are required. For example, in terms of material range, not only metal powder, but also alloy powder and metal compound powder are used In terms of powder shape, it is required to use various shapes of powder. With the continuous increase of powder metallurgy materials and products and the continuous improvement of their quality, more and more kinds of powder are required. (2) Reduction method for preparing metal and alloy powder from solid metal oxide and salt reduction chemical method for preparing metal compound powder from metal and alloy powder, metal oxide and non-metallic powder.A method for converting metals and alloys or metal compounds into powder in liquid state includes: (1) There are mechanical crushing method and electrochemical corrosion method for preparing metal and alloy powder from solid metal and alloy. Various methods for preparing powder and powder prepared by various methods.A method for converting metals and alloys or metal compounds into powder in a solid state includes: These methods are nothing more than changing metal, alloy or metal compound into powder state in solid, liquid or gaseous state. (1) Steam condensation method for preparing metal powder from metal steam condensation (3) Aqueous solution electrolysis method for preparing metal and alloy powder from metal salt solution electrolysis Molten salt electrolysis method for preparing metal and metal compound powder from molten salt electrolysis of metal.Method for converting metal or metal compound into powder in gaseous state: (2) There are replacement method and solution hydrogen reduction method for preparing metal alloy and coating powder from metal salt solution replacement and reduction A molten salt aging method for preparing metal powder by precipitation from molten metal salt Metal bath method for preparing metal compound powder by precipitation from auxiliary metal bath. Arduino mega pinout pwmFrom the industrial scale, Hans reduction method, atomization method and electrolysis method are the most widely used. There are many production methods of powder. Mechanical method is a technological process in which raw materials are mechanically crushed without changing their chemical composition Physicochemical method is a process to obtain powder by changing the chemical composition or aggregation state of raw materials with the help of chemical or physical effects. (3) Vapor phase hydrogen reduction method for preparing metal and alloy powder and metal and alloy coating from gaseous metal halide gas phase reduction Chemical vapor deposition method for preparing metal compound powder and coating from gaseous metal halide deposition.However, from the essence of the process, the existing pulverizing methods can be divided into two categories: mechanical method and physicochemical method. The purpose of forming is to make a blank with a certain shape and size, and make it have a certain density and strength. The powder is formed into a blank of the desired shape.
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