Preparation Of High Density Tungsten Alloy

Tungsten alloy is a two-phase alloy with high density (216.5g/cm3), also known as high-density tungsten alloy. High-density tungsten alloys are not only widely used in aviation, aerospace, weapons and other military industries, but also more and more in civilian industries. 

The preparation process of high-density tungsten alloy by tungsten boat manufacturers is as follows:

1. Ingredient design

In high-density tungsten alloys, the tungsten content is generally 85-98wt%. In addition to other elements, the most abundant elements in high-density tungsten alloys are Ni, Fe (Cu, etc.).

2. Milling

Alloys with excellent mechanical properties can be prepared from powders with high purity, small particle size and good uniformity. In the field of powder making, nano-powders are a research hotspot, mainly in the following two categories:

1) Spray drying method

The spray drying method is to prepare the original salt solution with a certain composition. The salt solution includes tungstate and metal chloride, etc., and the solution is atomized to generate small droplets. Due to the rapid evaporation of the solvent in the small droplets and the

The rapid deposition of the solute results in a powder crystal with uniform chemical composition.

2) Mechanical alloying method

The mechanical alloying method is to select a certain proportion of the initial tungsten alloy powder and metal balls and put them into a ball mill. Homogeneous compound powder.

3. Forming

The more traditional tungsten alloy forming process is compression molding, and the new alternative processes are powder extrusion molding and powder injection molding. Since these two methods mix the tungsten gold powder and the forming agent and then extrude them into the forming machine, they can prepare parts with complex shapes and have significant advantages. Powder extrusion molding, and powder injection molding technology Also due to the addition of forming agents, it has wider applicability.

4. Sintering

Since the solid-phase sintering method has relatively high requirements on the size of the original alloy powder, the liquid-phase sintering method has a long sintering time and is prone to collapse and deformation. Based on the advantages and disadvantages of the two, a two-step sintering process of solid-phase sintering and liquid-phase sintering is proposed. Due to the smaller deformation during the two-step sintering, the obtained tungsten alloy has a more uniform structure and the material properties will be greatly improved, so the two-step sintering is widely used. In addition, the newly developed microwave sintering and spark plasma sintering technologies are also being promoted and used in recent years.