Powder metallurgy is one of the common methods for preparing high specific gravity tungsten alloys. The specific steps are as follows:
1. Raw material selection: select high-purity tungsten powder and alloy element powder (such as iron, nickel, copper, etc.) as raw materials.
2. Mixing: Mix tungsten powder and alloy element powder evenly in a certain proportion.
3. Compression: Put the mixed powder into the mold and press it into a powder blank of a certain shape.
4. Sintering: Put the powder billet into a high-temperature sintering furnace, and sinter it at a certain temperature and time, so that sintering and diffusion reactions occur between powder particles to form a dense alloy billet.
5. Finishing: Finishing the sintered blank by mechanical processing, thermal processing and other methods to make the required parts.
The preparation of high specific gravity tungsten alloy by powder metallurgy has the advantages of low cost and high production efficiency. However, there are also problems such as the uniformity of powder mixing, the difficulty of forming the pressed blank, and the easy generation of pores during the sintering process. In addition, due to the high temperature required in the sintering process, optimization of equipment and processes is also required to ensure the quality and stability of the alloy.
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