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A higher amount of quartz powder is used to fill the mold compound, which results in a lower thermal conductivity. Also, it has a smaller thermal expansion coefficient. A better performance is achieved by electronic components if the thermo expansion coefficient for monocrystalline silicon is close to it.
After being purified from quartz rock, the powder of sphere quartz is pulverized and then passed through high temperatures to undergo phase and crystal change. The powder can be obtained by grinding irregular angular particles into regular, spherical particles. It can be prepared using a high-temperature plasma melt method, high temperature melting injection method or gas combustion flame method.
Plasma Melting at High Temperature
To melt quartz powder, the high-temperature plasma method utilizes high-temperature gases generated from AC or DC arc plasma to heat it. It is then heated, melted, and immediately vaporized. Then it’s collected with a cyclone, and bag. This is how the spherical silicone powder is made. This powder can be obtained at a high heat temperature. Chemical reactions can occur quickly at high temperatures and in high heat. These compounds are hard to produce by chemical liquid phase methods. This includes nitrides (carbides and borides), etc. The plasma will stop cooling after the reaction material has been removed. Particles in plasma can then be formed depending on the needs of the atmosphere.
Plasma technology, however, is extremely difficult. Plasma technology is difficult because the plasma’s electrical and magnetic properties can affect its plasma temperature. It is relatively small and highly concentrated. Controlling the high temperature of the heating element is hard. The temperature range can also be difficult to set. The plasma energy is created by the current that passes through the medium. A too high level of dilution will cause the current to cease and the effect to be lost. It is therefore difficult to manage the product’s spheroidization rate and to produce large quantities.
High Temperature Melt Injection
High-temperature melt injection involves putting the material under high temperatures to melt it. After the melt has flowed out, it’s sprayed using high-pressure water through an ejector. The high-speed jet airflow disperses and breaks down the melt into mist. When they cool down, the tiny droplets become smooth particles. This is the easiest way to guarantee spheroidization. However, key technologies, such as the furnace high temperature materials, quartz melt atomization, and secondary pollution prevention, have yet to be developed. Therefore, it’s very challenging to produce high-purity, high-purity, quartz powder.
Gas Combustion Flame Method
Natural gas, acetylene, hydrogen and other fuel gases are used in the gas combustion flame process. As a supporting gas, oxygen or air can be added to create a flame by using closed-hearth furnace combustion. The flame is also carried with it the angular quartz crystal powder. It is first melted in the high-temperature flame fields before it can be collected by the airflow. After it has left the high temperature field, the powder immediately shrinks and then is quickly cooled. It involves theories of thermodynamics as well as gas and particle hydrodynamics. First of all, plasma high temperature flames have a lower temperature field. Second, there is fewer influencing variables. This does not involve electromagnetic theory or the movement of ions within the electromagnetic field. Because of the problem of motion, it is much easier to regulate various factors that affect conditions. This makes equipment manufacturing simpler, allows for industrialization and offers better prospects.
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