The"growth"process of diamond
What is the use of diamonds ?
Our usual glass knife, the top is actually diamond. Diamonds are coated on the surface of cutting tools for precision machining and drill bits for oil drilling to improve their wear resistance. Because diamond is the hardest natural substance in the world.
Diamond also has one characteristic, is very good thermal conductivity. Its thermal conductivity is about five times that of pure copper at room temperature. It has potential important applications in the semiconductor industry. According to Moore ' s law, the components of large-scale integrated circuits are shrinking in size and increasing in density, resulting in their thermal load rising. If the heat is not dissipated in time, it may burn the circuit board of the semiconductor and burn the components. If we can use the high thermal conductivity of diamond as a substrate or radiator of large scale integrated circuits, it can dissipate heat in time to solve the current bottleneck restricting the development of electronic components.
The origin of ' artificial ' diamond
Diamond has a wide range of applications, but diamond reserves are not rich, natural diamond alone is difficult to meet industrial needs. In order to change this situation, in the 1960s, after hard work, the technology of “ artificial ” diamond was gradually mastered. After entering the 21st century, the artificial synthetic diamond industry has made rapid progress, and in recent years it has occupied 90 % of the world ’ s industrial diamond output. On the other hand, China is also constantly improving the production process of ' artificial ' diamond, and strive to produce larger particles and higher purity diamond.
What are the methods of ' artificial ' diamond ?
At present, there are usually two commonly used methods for synthetic diamond.
The first method is called the static pressure catalyst method. Refers to the diamond under the condition of thermodynamic stability of the diamond, under the condition of constant ultra-high pressure and high temperature and the participation of catalysts.
The second is called the directional blasting method. The shock wave of the directional blasting of high-velocity explosives accelerates the flight of the metal flying sheet, hitting the graphite sheet and causing the graphite to be converted into polycrystalline diamond. Its structure is very similar to that of natural diamond, which is formed by unsaturated bonding and has good toughness.
In the future, diamond synthesis will develop in the direction of high purity and large particles. For the demand for diamond, we will no longer rely solely on the gifts of nature, and synthetic diamond will also enter more production areas and be more widely used.