Tungsten heavy alloy is based on tungsten, with a small amount of Ni, Co, Mo and other elements added to it. It is a typical two-phase alloy and is also called “high-density alloy”. According to different product uses and working environment requirements, the tungsten content of high-density tungsten alloy products is usually distributed in 79%W~97%W, and the density range is 15.00g/cm~18.50g/cm. At the same time, some rare metal elements (Co, Mo, Cr, etc.) can be added to improve some product properties, such as: hardness, ultimate tensile strength, yield strength, elongation, etc.
The most commonly used are: W-Ni-Cu and W-Ni-Fe two series. This material has remarkable characteristics in physical properties such as density, strength, hardness, ductility, conductivity/thermal properties, etc., so it is widely used in defense industry, aerospace industry, medical industry, electrical industry and other industries
Performance
High-density tungsten alloy is a kind of alloy with tungsten as the matrix (W content 85-99%) and added with elements such as Ni, Cu, Co, Mo, Cr, etc.
According to the composition characteristics and uses of the alloy, it is divided into main series such as W-Ni-Fe, W-Ni-Cu, W-Co, W-WC-Cu, W-Ag, etc. Its density is as high as 16.5-19.0g/cm3, and it is called high-density alloy by the world.
It also has a series of excellent properties, high specific gravity: generally 16.5-18.75g/cm3, high strength: tensile strength is 700-1000Mpa, strong radiation absorption ability: 30-40% higher than lead, high thermal conductivity: 5 times that of mold steel; small thermal expansion coefficient: only 1/2-1/3 of iron or steel, good electrical conductivity; good weldability and processability. In view of the above excellent functions of high specific gravity alloy, it is widely used in aerospace, aviation, military, oil drilling, electrical instruments, medicine and other industries.
Process flow
1. Mixing: tungsten powder, nickel powder, iron powder (if the product has magnetic requirements, copper powder can be added instead of iron powder and mixed evenly)
2. Mixing → vacuum drying → pressing and molding → pre-burning and degreasing → processing and molding → vacuum sintering → quality inspection → rough product → subsequent processing (oil immersion, machining, heat treatment, electroplating, rolling, forging, etc.) → fine grinding product → product delivery
Main products
1. Tungsten alloy fishing sinker series: bullet type, teardrop type, round tube type, semi-teardrop type, cylindrical hole type.
2. Tungsten beads, tungsten ball series: φ1.5mm -φ10mm accuracy ±0.01mm, used for fish sinker counterweights, submunitions, medical instrument counterweights, shotgun pellets; φ0.1mm-φ10mm accuracy ±0.1mm, used for oil drilling balance, shotgun pellets.
3. High-density tungsten-based alloy counterweight series: Mechanical counterweights; Flyweights; Oil drilling counterweights; Darts; Golf counterweights; Racing counterweights; Mobile phone and game console vibrators; Aerospace gyroscopes; Clock pendulums; Balanced counterweights; Anti-vibration knife bars.
4. Medical tungsten alloy radiation shielding material series:
(1) Tungsten alloy grating blades;
(2) Tungsten alloy protective tanks – used for medical radioactive shielding walls; Shielded needle tubes – used for medical radioactive liquid shielding; Tungsten alloy storage – used for cans, boxes and other containers for storing radioactive materials.
(3) Collimators – used for tungsten alloy series detection container systems in medical linear accelerators and nuclear technology applications; Co60 and other radiation shielding.
5. Electrical materials series: Electrodes for EDM and resistance welding; High-density electrical contacts, contacts in air circuit breakers.
6. Military series: armor-piercing projectiles; cluster bullets, balls, rods, square pellets, cylinders, other tungsten alloy electric upsetting blocks, tungsten alloys in nuclear technology applications.