How To Significantly Increase The Density Of Powder Metallurgy Products

How to significantly increase the density of powder metallurgy products? The flow warm pressing process is a new powder metallurgy technology that mixes an appropriate amount of coarse powder and fine powder and thermoplastic lubricant at a certain temperature to prepare a mixed powder with uniform performance and good fluidity, and then presses it at 80℃ to 130℃, and finally sintering to obtain the product.

Compared with traditional powder metallurgy technology, the flow warm pressing process overcomes the latter’s shortcomings in forming complex geometric shapes and avoids the high cost of metal injection molding technology. It has the following characteristics:

1. Parts can be made into complex geometric shapes. Conventional warm pressing processes are difficult to manufacture parts with grooves, holes, and threaded holes perpendicular to the pressing direction, and usually require a second processing, but it becomes very simple to manufacture this type of parts using the flow warm pressing process.

2. Density is increased and performance is more uniform. The powder density of the flow warm pressing process is high, so the density of the semi-finished product after warm pressing will also increase. Not only that, the density of the products made by the flow warm pressing process will also be more uniform, because the powder in the flow warm pressing process has good fluidity.

3. Simplify the manufacturing process and make the manufacturing cost lower. The traditional temperature pressing process requires secondary processing, but the flow temperature pressing process does not require it. In addition, the special binders and lubricants used in the flow temperature pressing process are moderate, and the mixed secretion also has high viscosity and critical shear strength, and will not deform during the heating process, so the binder can be directly removed during the sintering process. Not only does it simplify the manufacturing process, but the manufacturing cost is also lower.

4. It has strong adaptability. Researchers believe that all powder systems are theoretically applicable to the flow temperature pressing process, but one thing to note is that the powder system needs to have good sintering properties in order to achieve the required density and performance.

Powder metallurgy lubricants have the following advantages:

1. Good green strength.

2. Good surface quality of the product.

3. The product has no black spots and a high sintering yield rate.

4. Clean and hygienic: It is a pure organic matter, which is completely decomposed at high temperature without residue and does not pollute the sintering furnace.