The Chemical Vapor Deposition (CVD) process replicates the crystallization of carbon over a diamond seed inside a vacuum chamber. These plates also called as seeds are placed inside the vacuum chamber of the system on a Metal disc. Then the chamber is closed and vacuum is created inside the chamber using rotary pump so that all the gases are evacuated from the chamber. Then gas mixtures of argon, methane, nitrogen, hydrogen are introduced in the vacuum chamber & microwave is used to make the plasma in the system. The Super-Hard Material is grown using gas mixtures in appropriate ratio at desired temperature and pressure in the chamber of this system using microwave power. After 100 to 500 hours, the system is switched off. They are polished using the same equipment and techniques for gem application. The only difference is origin. We produce Single Crystaline Super-Hard Material’s using CVD Technology.
In the High Pressure-High Temperature (HPHT) method, there are two main press designs used to supply the pressure and temperature necessary to produce single crystalline super-hard material the belt press, the cubic press. Diamond seeds are placed at the bottom of the press. The internal part of press is heated above 1400 °C and melts the solvent metal. The molten metal dissolves the high purity carbon source, which is then transported to the small diamond seeds and precipitates, forming a large single crystal super-hard material.
The second type of press design is the cubic press. A cubic press has six anvils which provide pressure simultaneously onto all faces of a cube-shaped volume. The first multi-anvil press design was a tetrahedral press, using four anvils to converge upon a tetrahedron-shaped volume. The cubic press was created shortly thereafter to increase the volume to which pressure could be applied. A cubic press is typically smaller than a belt press and can more rapidly achieve the pressure and temperature necessary to create Lab Grown Diamond. However, cubic presses cannot be easily scaled up to larger volumes: the pressurized volume can be increased by using larger anvils, but this also increases the amount of force needed on the anvils to achieve the same pressure.