Diamond has high thermal conductivity, excellent insulation performance and low dielectric constant, which are the basic requirements of electronic packaging materials. In fact, in acoustic materials, diamond films generally exist as substrate materials, and their applications are still high thermal conductivity. Thermally stable polycrystalline diamond
has better thermal stability. So let's see what are the application performance indicators of a diamond.
1) Wear resistance.
When a polycrystalline diamond is used as cutting or drilling tool material, its wear resistance is directly related to tool life, so wear resistance becomes the most important performance index of polycrystalline diamond. The wear resistance of polycrystalline diamond is usually expressed by wear ratio. At present, the wear ratio of polycrystalline diamond is determined by the industry standard "the wear ratio of synthetic diamond sinter".
2) Thermal stability.
Thermal stability, also known as heat resistance, is generally expressed by heat resistance temperature, which is the highest heat treatment temperature that polycrystalline diamond can withstand to keep its properties unchanged. Thermal stability is one of the important performance indicators of polycrystalline diamond. It involves the process of making polycrystalline diamond tools and the use environment of tools. It is a performance parameter that must be considered by tool manufacturers. If the temperature used in manufacturing is too high or the tool is used at too high temperature, the effect of polycrystalline diamond tools will be worse.
3) Impact toughness.
Impact toughness refers to the maximum ability of polycrystalline diamond or diamond composite sheets not to be destroyed under impact load. This performance index is very important for polycrystalline diamond tools to play its characteristics of high hardness, good wear resistance, and long life.
4) Bending strength.
The bending strength of polycrystalline diamond was measured by a three-point bending test. Polycrystalline diamond samples can be made into rods or wafers.
Polycrystalline diamond has a high hardness value, which is second only to single-crystal diamond. Generally, it is measured by Knoop hardness.
Generally speaking, the conductivity of the polycrystalline diamond is not very good, and the resistance value is very large. It is difficult for ordinary EDM equipment to be competent for polycrystalline diamond processing. Only with special EDM power supply can an acceptable processing speed be obtained. Even so, the processing of polycrystalline diamond by special EDM equipment is still much slower than that by ordinary EDM equipment.
7) Corrosion resistance.
The mechanical properties (hardness, wear resistance, etc.) of growth-sintering polycrystalline diamond remained unchanged after long time heating in acid or alkali solution. The conductivity of growth-sintered polycrystalline diamond (PCD) decreases significantly after strong acid treatment because the metal phase as binder reacts with acid and is leached from PCD.