A metal powder formed by the partial or complete alloying of two or more components. Alloy powder is mainly composed of iron alloy powder, copper alloy powder, nickel alloy powder, cobalt alloy powder, aluminum alloy powder, titanium alloy powder and precious metal alloy powder.
Alloy powder Introduction
Pre-alloyed powder is usually prepared by atomized milling method,
Completely alloyed powder in the form of a solid solution and an intermetallic compound.
Where can melt the liquefied alloy, can be made by the powder method of atomization powder.
In the field of contemporary powder metallurgy, atomized pre-alloy powder is the largest variety,
The largest output, the most widely used and the performance of the most ideal alloy powder.
Ferro alloy powder as a structural material powder is divided into low alloy steel powder and high alloy steel powder. Low-alloy steel powder generally contain 1% to 2% of copper, nickel, molybdenum, chromium and manganese, a small amount of alloying elements, water atomized pre-alloy powder and reducing the diffusion part of the alloy powder two types. Common varieties are Distaloy alloy (Fe-0.01C-1.5Cu-1.8Ni-0.5Mo) and Astaloy alloy (Fe-0.05C-1.9Ni-0.5Mo-0.25Mn-0.1Cr) from Sweden and KIP alloy from Japan Fe-0.02C-0.1si-0.6Cu-1.5Ni-0.3Mo) series of powders. This low alloy steel powder compression, chemical composition, suitable for the manufacture of high strength powder metallurgy parts. High alloy steel mainly stainless steel powder and high-speed steel powder. Most of the stainless steel powder is Fe-18Cr-8Ni austenitic type, used in the manufacture of powder metallurgy porous filter and corrosion-resistant parts; or powder packing, hot extrusion, rolling production of pipes, bars and plates. High-speed steel powder In addition to Fe-1.0C-6W-5Mo-4Cr-2V (US M2) and Fe-1.5C-12W-4Cr-5V-5Co (US T15) , Vanadium, cobalt, respectively, up 2.3%, 6.5%, 10% of powder high-speed steel proprietary varieties. Aerosolized high-speed steel powder oxygen content is low (<100 × 10), the particles are spherical, the powder can be loaded into the envelope, the hot isostatic pressing material. Water atomized high-speed steel powder, high oxygen content (> 600 × 10), the particles are irregular shape, by pressing, sintering powder metallurgy parts. Ferroalloy powder can also be used as a functional material, such as ferromagnetic Fe-9.6Si-5.4Al alloy powder and Fe-23Co-9Ni alloy powder; permanent magnetic powder is used as a sintered magnet Fe-7Al-14Ni-37Co-3Cu-8Ti alloy powder . In the 1980s, a new kind of iron-based rare earth permanent magnetic alloy powder was newly developed. Its typical chemical composition is Nd15Fe77B8 and Nd13Fe82B5 (both are atomic percentages). The former by the directional crystallization ingot mechanical crushing system for the production of anisotropic sintered magnets, the maximum energy product up to 400kJ / m, the latter by quenching thin strip from the system, made of resin or rubber bonded magnets. Ferroalloy powder can also be used as a thermal spray (hard) hard surface material, such as Fe-2B-3Si alloy powder, its low melting point (1000 ~ 1100 ℃), high hardness (HRC 45 ~ 50), can be used to improve the wear resistance of the workpiece surface Sex or repair wear parts size.
Copper alloy powders include series of powders such as Cu-Zn, Cu-Sn, Zn, Pb, P and Cu-18Ni-1.7Zn-2Pb, Almost all of the copper alloy powder can be made into spherical or irregular shape particles by the atomization milling method. They have good strength, thermal conductivity, abrasion resistance and color and can be widely used in the manufacture of mechanical parts, porous filters, oil-bearing, decorative and thermal spray (hard) hard surface material. High lead bronze Cu-38Pb powder, Cu-24Pb-4Sn powder, can produce bimetallic bearings. This is a multi-purpose composite anti-friction material for cars.
Nickel alloy powder in the manufacture of high temperature alloy materials, magnetic materials and thermal spray coating is widely used. High-temperature alloy powder containing chromium, cobalt, manganese, titanium, aluminum, niobium, zirconium and boron alloying elements aging fortified atomized pre-alloy powder and containing chromium, aluminum, titanium, yttrium oxide-based dispersion strengthened Mechanical alloying powder. The former, such as René 95 (Ni-0.1C-14Cr-8Co-3.5Mn-3.6W-2.5Ti-3.5Al-0.1B-3.5Nb-0.05Zr) in the United States, is used to make turbine disks of high thrust aerogenes; For example, the United States Incoloy MA956 (Ni a 20Cr-4.5Al-0.5Ti-0.7Y203), for the manufacture of gas turbine casing and flame tube. Nickel alloy powder is also a class of Ni-Cr-B-Si thermal spray (welding) alloy powder, containing as high as 2% to 4% of boron and silicon, and its low melting point (1000 ~ 1100 ℃) Plasma flame spraying process self-slagging, is a good self-fluxing alloy powder, used for wear-resisting, corrosion-resistant parts of the surface of the enhanced coating. Nickel alloy (Ni_17Fe-2Mo), also known as Permalloy (USA), is a kind of high permeability ferromagnetic functional material, usually made by powdering by atomization, its surface is suitable for manufacturing Inductor coil core.
Cobalt alloy powder is Co-32Cr-1.4C-6W and Co-0.5C-25.5Cr-7.5W-10.5Ni-2Fe. The former is thermal spray powder for plasma spray welding at high temperature and pressure under the surface of parts to improve its high temperature wear resistance and corrosion resistance; the latter for the manufacture of high temperature alloys. In addition there Co-26Cr-5Mo powder, used in the manufacture of artificial bone joints. Cobalt alloy powder plays an important role in functional materials. The rare earth cobalt alloy powder can be manufactured by powder bonding or liquid phase sintering method. SmCo5 and Sm2Co17, sintered permanent magnet maximum energy product up to 208,256kJ / m.
Aluminum alloy powder by atomization or mechanical alloying preparation, and to hot isostatic pressing, hot extrusion, hot forging into full compact light metal alloy material. Aluminum powder is divided into three types. At room temperature high-strength varieties Al-6.5Zn-2.5Mg-1.5Cu-0.5Co-0.3O and Al-7.5Zn-2.5Mg-2Cu-0.2Zr-0.2Cr corrosion resistant alloy powder and the mechanical alloying A1-4Mg -CO dispersion strengthened aluminum powder. High temperature and high strength type (working temperature 170 ~ 300 ℃) varieties Al-8Fe-4Ce and Al-8Fe-2Mo powder. High specific strength, than the rigid type Al-2Li powder. This aluminum-lithium alloy can reduce the density of 6% to 9%, while the rigidity modulus can be increased by 19% to 30%. Aluminum powder can be used to produce high-performance light metal alloy materials for the aerospace, aerospace and automotive industry to create shaped structural parts and components.
Titanium alloy powder by rotating electrode powder or inert gas atomization method, the chemical composition of Ti-6A1-4V and Ti-6Al-6V-2Sn. These titanium alloy powders are hot-isostatically capable of being formed into a near-true-shaped, profiled member and plate having a theoretical density at one time. These products have been applied to aero engines, fighter jets and helicopters. Titanium powder can also be made of medical inlays bone.
Precious metal alloy powder is mainly silver alloy powder, mostly broken by mechanical or ingot casting method. Ag-5Cu-26Sn-Zn powder; electrical contact materials Ag-50W, Ag-Mo powder and Ag-15Ni powder; and for brazing solder. Ag-15Cu-20Zn-20Cd powder and so on.
A slightly blue, white, lustrous, low melting point metallic element that is either divalent or tetravalent within a compound and will not be oxidized by air, primarily in the form of dioxide (cassiterite) and various sulfides ( For example, cassiterite). Element symbol Sn. Tin is the famous "hardware" - gold, silver, copper, iron, tin one. As early as ancient times, people discovered and used tin. In some ancient tombs in our country, we often find some tin pots, tin candlesticks and the like. According to research, when China Zhou Dynasty, the use of tin is already very common. In Egyptian tombs, tin-made items were also found.