What is powder metallurgy?

Taking a bus home, I heard two people who looked like technicians talking about powder metallurgy. Think about the previous customer products also involved in this material, so want to understand in detail what this is. Can this be matched according to different proportions? Just like plastic ingredients. I look forward to your answer.

Powder Metallurgy is a large field. Which aspect is of interest to you? This article on Sintered Iron Parts may be of interest:

https://www.totalmateria.com/page.aspx?ID=CheckArticle&LN=EN&site=kts&NM=528

It's very useful.Thank you very much.