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.

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.

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.

Silver-tungsten materials are generally used in low-voltage plastic case circuit breakers, universal circuit breakers and protective switches, as moving contacts. Silver-tungsten materials are usually fabricated by infiltration process in powder metallurgy, such as the steps of making AgW₅₀ materials: (1) silver and tungsten powder are mixed into AgW₇₀ powder according to 3:7; (2) pressing AgW₇₀ porous skeleton; (3) adding silver plate to obtain dense AgW₅₀ materials by high temperature infiltration, and the silver content of waste materials produced in the production process is generally between 20-50%. Separation and recycling are needed.

Nanomaterials refer to materials (1-100 nm) with at least one dimension within the nanoscale in three-dimensional space. According to the classification of space dimension, nanomaterials can be divided into zero dimension, one-dimensional, two-dimensional and so on. Zero dimensional tungsten oxide mainly refers to nano tungsten oxide powders.

At present, lithium-sulfur battery is a kind of battery system with high energy density. Its theoretical energy density is as high as 2600Wh/Kg, which is much higher than other lithium-ion battery systems. Usually, lithium sulfur battery uses sulfur or sulfur based composite as positive electrode and lithium metal as negative electrode. Lithium-sulfur batteries have become a hot spot in battery research because of their high theoretical specific capacity (1675 mAh / g), low price, abundant reserves and relatively friendly environment.