What is tungsten heavy alloy?
Baoji Hanz Material Technology Co., Ltd. is the directly manufacturer of tungsten heavy alloy with 9 years' experience, supplying products to different customers.
Tungsten heavy alloys generally are refractory metal, which have two-phase composites consisting of W-Ni- Fe or W-Ni- Cu or even W-Ni-Cu-Fe, some tungsten alloy is added with Co、Mo、Cr, etc.
They have very high melting point and have a density twice that of steel and are more than 50% heavier than lead. Tungsten content in conventional heavy alloys varies from 90 to 98 weight percent and is the reason for their high density (between 16.5 and 18.75 g/m3). Nickel, iron and copper serve as a binder matrix, which holds the brittle tungsten grains together and which makes the alloys ductile and easy to machine.
Nickel-iron is the most popular additive, in a ratio of 7Ni:3Fe or 8Ni:2Fe (weight ratio).
The conventional processing route for tungsten heavy alloys includes mixing the desired amount of elemental powders, followed by cold pressing and liquid phase sintering to demanded density.
The matrix alloy melts and takes some tungsten into solution during liquid phase processing, resulting in a microstructure through which large tungsten grains (20–60µm) are dispersed in the matrix alloy.
The as-sintered material often is subjected to thermo mechanical processing by swaging and aging, which results in increased strength and hardness in the heavy alloys.
钨合金通常为难熔金属，一般由W-Ni-Fe (钨-镍-铁)或W-Ni-Cu (钨-镍-铜)或W-Ni-Cu-Fe(钨-镍-铜-铁)构成，有些钨合金还有添加Co (钴)、Mo (钼)、Cr (铬)等。他们有很高的熔点，密度是钢铁的2倍，并且重量比铅重50%。钨的含量在合金中通常占90%~98%这也正是钨合金能有高密度（通常为16.5克/立方厘米~18.75克/立方厘米）的原因所在。Ni、Fe、Cu 则被用作是粘合剂，起到让易脆的钨粘结在一起的作用，从而，增强钨合金的延展性，使其易于加工。Ni-Fe是交常用的添加剂，其比例为7Ni:3Fe 或8Ni:2Fe（重量之比）。钨合金常规的生产流程包括混料，冷压和液相烧结直至所需的密度。在液相烧结的过 程，这种基体合金呈熔解态，有助于钨更好地溶于液体，使钨大颗粒（20~60微米）分散到这种基体合金中。这种处于烧结态的材料通常还要进行热机械处理过程，如：锻造，以便增强其硬度和强度。目前高比重合金（钨合金）的成分以WNiFe颇受欢迎，例如93W-4.9Ni-2.lFe和95W-4Ni-lFe。在WNiFe合金中添加适量的钴可以增强他的强度和延展性。
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