What are the basic properties of tungsten alloys?

What are the basic properties of tungsten alloys?

Tungsten alloys are a type of tungsten based alloy with a tungsten content of 85% to 99% and a small amount of Ni added Cu, Fe Alloys composed of elements such as Co. Mo and Cr have a density of up to 16.5-18.75g/cm3, commonly known as high density tungsten alloys, heavy alloys, or high-density tungsten alloys. Tungsten alloys are widely used in the electronics and light source industries, as well as in the aerospace, casting, weapons and other sectors to make rocket nozzles, die-casting molds, armor piercing bullet cores, contacts, heating elements, and insulation screens.

Tungsten Alloy is a type of alloy material that uses transition metal tungsten (W) as the hard phase and metal elements such as nickel (Ni), iron (Fe), copper (Cu) as the bonding phase. It has excellent thermodynamic, chemical, and electrical properties and is widely used in fields such as national defense, military, aerospace, aviation, automotive, medical, and consumer electronics. According to different purposes, tungsten alloys are divided into hard alloys, high density alloys, metal sweating materials, contact materials, electronic and electric light source materials. The basic properties of tungsten alloy blocks are mainly introduced below.

1. High density

Density is the mass per unit volume of a substance, a characteristic of a substance that is only related to the type of substance and is independent of its mass and volume. The density of tungsten alloys is generally 16.5-19.0g/cm3, which is equivalent to more than twice the density of steel. Usually, the higher the tungsten content or the lower the bonded metal content, the higher the density of tungsten alloys; On the contrary, the density of the alloy is lower. The density of 90W7Ni3Fe is about 17.1g/cm3, 93W4Ni3Fe is about 17.60g/cm3, and 97W2Ni1Fe is about 18.50g/cm3.

2. High melting point

The melting point refers to the temperature at which a substance changes from solid to liquid under a certain pressure. The melting point of tungsten alloy is relatively high, about 3400 ℃. This also means that the alloy material has good heat resistance and is not easily melted.

3. High hardness

Hardness refers to the ability of a material to resist indentation deformation caused by other hard objects, and is one of the important indicators of material wear resistance. The hardness of tungsten alloys is generally 24-35HRC. Usually, the higher the tungsten content or the lower the bonded metal content, the greater the hardness and wear resistance of tungsten alloys; On the contrary, the smaller the hardness of the alloy, the poorer its wear resistance. The hardness of 90W7Ni3Fe is 24-28HRC, the hardness of 93W4Ni3Fe is 26-30HRC, and the hardness of 97W2Ni1Fe is 28-36HRC.