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Solid sintering and liquid sintering in MIM

Categories: ZCMIM NewsStars: 3StarsVisit: -Release time: 2019-06-06 14:46:00
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Sintering is a key step in process of metal injection molding (MIM). Temperature and time control in sintering process directly affects final product performance.

When sintering de-binded part, powder complete coupling between powder particles to reduce gap through atom to achieve densification at a temperature lower than that of its main components. In MIM process, densified part will still have shape as designed and consistent with mold. After sintering, it will have a certain strength and property, can withstand a certain external force, and will not be as porous and fragile as green part.

Some people have summarized characteristics of MIM sintering from two aspects. From macro point of view, overall porosity of green part have decreases, and density have increases. From microscopic point of view, particle transfer occurs in the atomic generation of powder particles, so that the powder does not need the effect of binder to produce interparticle bond to maintain a certain shape and performance.

The principle of sintering is to use the thermal force to activate the atoms of powder at a certain temperature so as to transfer their physical positions and change the powder-like billet into a block-like billet with close particle connections

From this, we can see the importance of temperature for sintering. Theoretically speaking, the higher the temperature is, the faster the migration of atoms generated in sintering process, and the more atoms from one position to another, the faster the sintering process will go. In actual production application, people will often mention two words: solid sintering and liquid sintering. The difference between them is simply that the sintering temperature is different, temperature of solid sintering is lower than all components’ melting point, and liquid sintering is below main component’s melting point. At the same time, these two sintering methods have one thing in common: they are all done without external pressure.

Therefore, solid-phase sintering and liquid-phase sintering are also called pressure-free sintering, which is mainly compared with hot-pressing, hot-forging and hot-isostatic sintering. In MIM process, pressure free sintering is generally used.

Keywords in the article: metal injection molding (MIM)
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