Powder metallurgy porosity refers to the ratio of void volume to total volume in powder metallurgy products, usually expressed as a percentage. The porosity of powder metallurgy products is one of the important parameters for their physical, chemical, and mechanical properties, which affects their mechanical strength, corrosion resistance, thermal conductivity, electrical conductivity, and other properties.

The porosity standard for powder metallurgy is usually established by national or industry standards, and the specific standards vary depending on the different powder metallurgy products. Here are some common powder metallurgy porosity standards:

1. Porosity standard for metal powder metallurgy products: Depending on the type of metal material and product, the porosity is generally required to be between 30% and 60%.
2. Porosity standard for ceramic powder metallurgy products: Depending on the type of ceramic material and product, the porosity is generally required to be between 30% and 50%.

3. Porosity standard for composite powder metallurgy products: Depending on the type of composite material and product, the porosity is generally required to be between 20% and 40%.

It should be noted that the porosity standard of powder metallurgy is not an absolute limitation. In actual production, factors such as the actual performance and production cost of the product need to be considered to determine the optimal porosity index.

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