Synthetic Single-crystal Diamond SUMICRYSTAL
■ General Features SUMICRYSTAL is the world's first commercially available large-grained high-purity single-crystal diamond, developed by Sumitomo. Thorough quality control has achieved stable quality, making SUMICRYSTAL ideal as an industrial material. ■ Production Method The synthetic single-crystal diamond SUMICRYSTAL is synthesized in a super high pressure chamber from 5 to 6GPa and high temperatures from 1,300 to 1,600°C. The temperature difference between the raw carbon and the seed crystal is used to grow the diamond on the seed crystal. Through this stringent control of pressures and temperatures, a more stable structure with minimal impurities can be obtained. ■ Properties SUMICRYSTAL has 4 main advantages over natural diamond. 1) Structural advantage: Natural diamond is rounded and the crystal orientation is difficult to determine with the naked eye. SUMICRYSTAL, however, has a distinct crystal face which makes the identification much easier. 2) Uniformity: Due to the strictly controlled conditions in which the crystals are grown, uniform quality is obtained consistently. 3) Availability: Unlike the limited supply of natural diamonds, SUMICRYSTAL can be mass produced. 4) SUMICRYSTAL diamond type Ib, which is used for tools, has mechanical and thermal properties equal to or even greater than natural diamond, while containing trace amounts of nitrogen impurities.
M
● Inside a super high pressure chamber
Synthetic Conditions Pressure: 5 to 6GPa Temperature: 1,300 to 1,600°C
Pressure
Piston
Carbon source
Solvent metal
C
Die
High temperature
Temperature Difference (20 to 50°C)
D
Low Temperature
Seed Crystal
S
SUMICRYSTAL
Pressure
T
V
● Microfracture Strength of Synthetic Diamond
● Orientation and Wear Resistance
W
30
Cutting Conditions: Metal Bond Diamond Grindstone: #800 Grinding Speed: 3,000m/min
25
20
15
10
Natural Diamond
SUMICRYSTAL
M30
Orientation / Direction
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