How to improve the density of stainless steel powder metallurgy?

First,Supersolid line sintering

1、Conventional stainless steel sintering generally USES solid phase sintering. However, solid phase sintering results in a large number of pores in stainless steel. The supersolid linear liquid phase sintering of guangdong da-hong new material enables the stainless steel prealloy powder to form a liquid phase during sintering.

2、Guangdong macro new materials in 1400 ℃ solidus liquid phase sintering of stainless steel, it's on the density, hardness, wear resistance and corrosion resistance were higher than 1200 ℃ under solid phase sintering product. Due to high sintering temperature, excessive growth and overburning of grain should be avoided.

Second,Use appropriate additives

1、In the process of manufacturing stainless steel powder metallurgy, guangdong dahong new material adds some alloy elements with low melting point to the powder and reduces porosity through the liquid phase formed during sintering, so that the stainless steel can meet higher performance requirements. We often use to 304 stainless steel, for example, add 2% - 8% of the copper alloy, due to the low melting point of copper, 960 ℃ can begin to form liquid, form all the liquid to 1000 ℃, when the temperature is higher than the melting point of copper, the liquid flow makes the surface porosity constantly spheroidizing and shrink; As copper has good wettability, guangdong dahong new material is evenly distributed on the stainless steel matrix, so that the pores of the sintered body are significantly reduced, and the microhardness is also significantly improved.

2、The improved properties of powder metallurgy of stainless steel can be achieved by adding appropriate strengthening phase, especially the mechanical properties. Taking 316L stainless steel as an example, 1.5-3% silicon carbide is added into stainless steel. As a result of the interaction between silicon carbide and stainless steel, a phase with low melting point is formed, which improves the density of the sintered body and increases its hardness and wear resistance.

These two methods mentioned above are the longest used method to improve the density of stainless steel powder metallurgy in the production of guangdong dahong new materials. Compared with the stainless steel produced by traditional smelting process, the powder metallurgy of stainless steel has the features of close to net shaping, high dimensional accuracy, high material utilization ratio and even structure. If the density of stainless steel powder metallurgy is solved, the material will be widely used in production and life.

For more information on powder metallurgy of metals, please consult guangdong dahong new materials.