Reduced iron powder refers to iron powder obtained by reduction method, its production cost is lower than that of atomized iron powder, and it is widely used in powder metallurgy. Fluidity is one of the important parameters to measure the function of reduced iron powder. If the fluidity is not ideal, it will affect the use effect. So how should we improve the fluidity of reduced iron powder?
The methods for improving the fluidity of reduced iron powder include: adjusting the particle size composition, mixing atomized iron powder, adjusting the bulk density of the material, and adjusting the reduction temperature. In addition, due to seasonal changes in weather and temperature, the surface of iron powder particles tends to absorb water vapor in the rainy season, resulting in a decrease in fluidity. Therefore, attention should be paid to the moisture-proof work of iron powder in the process and packaging process.
(1) By adjusting the particle size composition of the iron powder to change the coarse powder content, the fluidity of the reduced iron powder can be improved. However, since the effect of coarse powder on confinement and sintering can reduce the mechanical properties of the product, adjustments should be limited.
(2) The fluidity of reduced iron powder can be improved by adding a certain amount of atomized iron powder. Taking into account the economic benefits and the influence of adding too much atomized iron powder to other functions of the product, the mixing amount should be 10%-20%.
(3) Reduce the bulk density of the raw material powder and the bulk density of the finished iron powder. Extending the reduction time can significantly improve the fluidity of the iron powder. Since it has almost no negative impact on the powder quality, this method is worth popularizing in China.
(4) Increasing the temperature of the reduction process can also reduce the bulk density of the finished iron powder, and improve the fluidity by extending the reduction time, but the high temperature has a great impact on the crushing of the equipment and the finished product, and another important technical indicator that is not conducive to the powder is glue Compressive maintenance should be used with caution.