Improve the compressibility of reduced iron powder

What factors affect the compressibility of the reducing iron powder

The compressibility of the reducing iron powder refers to the density of the powder compactness formed by the influence of a certain suppression force.
It refers to a process in which iron powder is compressed by pressure, and a process that meets a certain density standard and is sufficiently strong.
There are many reasons to influence the compressibility of iron powder, mainly divided into the following two kinds of influences:
1) external conditions influence, mainly refers to the type and dosage of lubricant, and suppress the forming parameters (such as suppressing pressure, methods and rates, etc.)
2) influence of internal conditions, mainly refers to the chemical properties of iron powder powder, physical properties and so on;
Its chemical properties mainly refers to the composition of powder.
Physical attributes mainly refer to powder size, grain size and powder shape.

How to improve the compressibility of iron powder?
The purpose can be achieved by improving the external and internal conditions of iron powder compression.

1) improve the chemical properties of iron powder

The reducing iron powder usually contains a lot of impurity elements.
The iron content of iron powder is inversely proportional to impurity content. The higher the purity, the lower the impurity content, and the higher the density of the final blank.
While the impurity elements of iron powder, will enhance powder microhardness, produce the way to reduce the powder compressibility, such as surface chemical combination based on this reason, in order to get better powder compressibility, as far as possible the impurity elements in production to a minimum.

2) composition of powder particle size and particle size of reducing iron powder

The particle size of iron powder is to loose density, particle contact and compressibility and powder liquidity (what is the fluidity of the powder?).
Have significant influence;
In the appropriate size range, the larger the granularity, the higher the powder compressibility;
Between the coarse particles at the same time add fine iron powder particles can also improve compressibility, which requires the production of reduced iron powder should have appropriate particle size distribution, which is do size reasonable collocation, resulting in lower porosity, improve powder compressibility.