Which is better, powder metallurgy or die casting?

Which is better, powder metallurgy or die casting?

In the processing and manufacturing process of many parts, powder metallurgy and die casting are two technologies that should be very extensive at present. Powder metallurgy is a process technology for making metal or using metal powder as raw material, forming and sintering, manufacturing metal materials, composites and various types of products. However, the essence of die casting is to make liquid or semi liquid metal fill the die cavity at a high speed under the action of high pressure, and then form and solidify under pressure to obtain castings. Which is better, powder metallurgy or die casting? Here is a brief introduction of the Zhongwei Precision Editor:

powder metallurgy

The choice between powder metallurgy and die casting is often a problem of part size or material requirements, rather than an economic problem.

In general, our common die-casting materials are aluminum alloy, magnesium alloy and zinc alloy, and copper alloy die-casting is also used within a limited range. Ferroalloy and stainless steel should adopt powder metallurgy process due to their high melting point. Compared with traditional powder metallurgy parts and metal injection molding parts, the size of die castings may be the same or much larger. When it is mainly material requirements, powder metallurgy process should be selected,

For example:

1. Very high strength. The tensile strength of some iron base sintered alloys is more than three times higher than that of die-casting alloys.

2. High wear resistance and high antifriction performance, which can be solved by iron base and copper base sintered alloy containing lubricating oil.

3. High operating temperature, which can be solved by iron base and copper base sintered alloy.

4. Corrosion resistance, copper base sintered alloy and sintered stainless steel can meet the requirements.

To sum up, we can see that between powder metallurgy and die casting, under the condition that the service temperature is not higher than 65 ℃ and medium strength is required, zinc die casting may be a substitute for iron based powder metallurgy products. The two processes are similar in terms of dimensional accuracy and requirements for machining. But for tools and processing costs, powder metallurgy is usually more beneficial. Therefore, compared with die castings, powder metallurgy is undoubtedly a better choice.