Diamond Drill Bits - Chemical Vapor-deposited Diamond Tooling

Chemical vapor deposited (CVD) diamond is a highly abrasion-resistant, pure diamond material that uses no binder. Instead, diamond is deposited in one of two forms: thick-film diamond, which is laid down as solid, free-standing wafers and then cut to size, and thin-film diamond, which is coated onto carbide inserts, rotary tools and diamond drill bits.

Chemical vapor deposited also has a low coefficient of friction. Material does not stick to it as it can with tungsten carbide or cobalt poly-crystalline diamond. In addition, the low coefficient of friction lets chemical vapor deposited diamond drill bits take high chip loads, providing faster and more efficient cuts.

Chemical vapor deposited diamond drill bits are thermally and chemically stable in applications where poly-crystalline diamond and tungsten are limited by their metallic constituents. Chemical vapor deposited diamond drill bits can withstand materials that generate acid by-products during machining. Examples of such materials include such plastic materials as phenolic resin, urethane and polycarbonate, making these tools vital for machining plastics.

Although all forms of diamond (including poly-crystalline diamond) are chemically reactive with ferrous and superalloy compositions at high temperatures, diamond is well known for its chemical inertness with most materials.

The binderless composition of chemical vapor deposited diamond bypasses the chemical degradation that can occur in cobalt metal sintered poly-crystalline tungsten carbide or diamond drill bits, especially at high cutting temperatures. This behavior, coupled with high lubricity and thermal conductivity, is believed to be a key advantage for the use of chemical vapor deposited diamond drill bits in high speed and dry machining operations.

Chemical vapor deposited diamond drill bits also offer high temperature hardness and wear resistance, even at high cutting temperatures.

Diamond Drill Bits Home