Water – oxidation

The oxygen content, both due to the high surface of such fine powders and the oxidation potential of water, is generally between 2000 and 5000 ppm. The shape of the particles can vary from slightly irregular to quite spherical, allowing high tap densities of boron nitride nozzle ~ 4.5 g ml – 1 for MIM degrees The AM field is a little more varied in its requirements, since several large processes are in use or in a very active development . The largest area now is laser sintering, which has different names, but is shown in Figure 3.

The molten metal is separated into small droplets and freezes quickly before the droplets come into contact with each other or with a solid surface. A thin stream of molten metal usually disintegrates by subjecting it to the impact of high-energy liquid or gas jets. The bubble applicator has a central drain port for the flow of liquid paint. The paint flows from the central exit door and moves over the surface of the bubble cup. The paint completely covers the surface of the bell glass and then, on the edge itself, liquid strings form. For drops of approximately 63 μm and 18 μm, the flight distance was further away from the nozzle and internal peritectural coagulation was sufficient as the cooling rate was further reduced, consuming a relatively larger part of phase ε.

Figure 7 and Figure 8 show the effect of an efficient anti-satellite system on gas atomization . This can significantly improve the bulk density (for example, from ~ 3.9 g ml – 1 to ~ 4.5 g ml – 1 for nominal powder 53/20) and make the difference between no current and ~ 13 s 50 g – 1 hall flow. For example, Gas atomization with efficient anti-satellite installations is certainly preferable for all processes that require good flow properties and high packaging density, including HIP, AM and MIM. Nozzles can be selected along with process parameters to achieve different performance factors related to droplet size, shape of spray area, and coverage area. The coating fluid is supplied through a nozzle at a relatively low speed because a process gas is introduced at a very high speed around the liquid, where it atomizes the coating liquid into drops. These atomizers provide precise control over the liquid and the atomizing air speeds and the associated droplet size.

Solved mounted powders can provide narrow particle size and high purity distributions. The process is now widely used for the production of Ti alloy, but suffers from the fact that the location of the current is poorly defined and the melting speed is quite slow, generally 10 to 30 kg h – 1. This leads to very high gas consumption per kilogram of dust and also to a relatively approximate distribution (median 40 to 100 microns), so fines are bad.

Meanwhile, vertical growth along the surface of the Cu3Sn phase also occurred due to the peritectural response between the ε and liquid Sn phases . Currently, the composition of the fluid was close to CLP and there was a three-phase coexistence (liquid, ε and η) in the system. There are many possible options with a representative diameter, the most widely used being the median mass diameter or the average volume diameter . These terms indicate the fall diameter so that 50 percent of the total mass of the aerosol is in drops of smaller diameter. At very high relative speeds, the atomization is completed within walking distance of the discharge opening. A wide range of drop sizes occurs, with an average drop diameter significantly less than the initial beam diameter.