The previous of Mo crucible is made by the turning and processing of the bar.  Most of the metals become chips.The utilization of materials is extremely low, and the cost is high. 

The adoption of the thick molybdenum plate stamping method makes it possible to produce the Mo crucible of which diameter is 66mm and the height is 48mm. The feasibility of this method is based on the special properties and state of the Mo plate.

This method includes two stamping procedures. Therefore, specially designed molds of which material is P6M5 steel are produced for this method. These molds can be stamped by heating to the operating temperature. The first stamping coefficient is 0.64 and the second one is 0.85. After the first stamping, the external diameter of blanks is 78mm, and the external diameter after the second stamping is 66mm.  The radius of the bottom is 25mm and the radius of the side wall is 20 mm.

In order to relax the stress inf the Mo blank, it is important to select the effective lubricant material. After trying out the graphite as the material of lubricant, we found that it is most effective when the heating is not more than 500 °C. The problem is that it is difficult to clean the parts after the stamping. 

The solution to this problem is that we can use the glycerol as the lubricant at the first stamping and use colloidal graphite at the second stamping. It can not only solve the problem of cleaning, but also obtain the Mo crucible without cracks.

When we produce the crucible, the thick molybdenum plate stamping method is adopted which can reduce the scrap loss of Mo by two-thirds of the scrap loss caused by the cutting. As a result, it improves the utilization of the material. With the development of the technology, we have produced the Mo crucible of which diameter is 84mm and the height is 65mm by this stamping method.

As a wear-resistant and corrosion-resistant coating, thermal sprayed WC-Co-Cr coating has been widely used in aerospace, metallurgy, machinery and other fields because of its high hardness and good toughness.

TZM (Titanium-Zirconium-Molybdenum Alloy) hot runner system generally includes nozzle, manifold, thermal chamber, accessories and so on. There are two kinds of nozzle: open hazzle and valve nozzle. The design procedure of TZM hot runner nozzle includes eight following steps:

1.0 The position of feed inlet is determined according to the plastic part structure and operation requirements. The feed inlet can be placed at every position of the plastic part if the structure of the plastic part allows and the nozzle and nozzle head in the fixed insert are not intervened by the structure. 

2.0 To determine the form of nozzle in the hot runner system. The key factors of selecting nozzle form are the materials of plastic parts and the operation properties of products. The batches of plastic parts production and the production cost of molds are the important factor of selecting the nozzle form. 

3.0 To determine the cavity of plastic part according to the production batches and the tonnage of the injection devices.

4.0 To decide the number of nozzles according to the determined position of feel inlet and the cavity of the mold. 

5.0 The radial size of nozzle depends on the weight of mold and the number of nozzles.

6.0 The size of mold structure can be determined by the structure of plastic parts. An then the size of standard nozzle should be selected according to the fixed insert and the thickness of fixed template.

7.0 hot manifold retaining plate

The shape of the hot retaining plate is determined according to the shape of the hot manifold. The lead groove is arranged on the plate, and a sufficient cooling water loop is designed near the hot runner plate, the nozzle, and the nozzle head.

8.0 To complete the design of the plastic molds of the hot runner system.

The finished TZM hot runner nozzle system must consider the degree of cooperation between the hot runner system and the plastic mold, that is the design of the hot half.

High purity tungsten above 5N has high resistance to electron migration, high-temperature stability and the formation of stable silicides. It is widely used in gate circuit electrode materials of large-scale integrated circuits. At present, there are two key points in the preparation of high purity tungsten powder by hydrogen reduction method: one is the improvement of smelting and purification technology, and the purity of raw materials meets the requirements of corresponding purity; the other is the cleanliness of the preparation process of tungsten powder, so as to reduce the pollution of impurities in the production process.