Diamond powder refers to diamond particles finer than 60 microns, including single crystal diamond micro powder and polycrystalline diamond micro powder. With the rapid development of nanotechnology, a new type has been independently developed between the two original diamond-like powders: nano-diamond micro powder.
Since the mid-1990s, due to the needs of the development of high-tech industrial technology and cutting-edge science and technology, the production of diamond micro powder has the following development trends:
1. The particle size classification is getting finer, and the size range is getting narrower and narrower
According to the manufacturer's standards, the particle size of diamond micro powder is finer and the particle size range is narrow.
2. Natural diamond micro powder continues to develop
Among industrial diamonds, the production of synthetic diamonds accounts for about three-quarters or more, but in some sectors, synthetic diamonds cannot completely replace natural diamonds. Natural diamond powder is characterized by very uniform particle shape and size, and sharp cutting edges. The abrasive paste prepared with this natural diamond powder is very effective for polishing and processing extra-hard metallurgical samples.
3. Ultra-high abrasive diamond micro powder
The production efficiency of diamond abrasive paste applied to polishing high-precision parts is 1 to 2 times higher than that of abrasive paste made of non-diamond abrasives, and the processing finish can be improved by one level.
The application of diamond grinding paste is very wide, and it is often used for the fine grinding and polishing of some high precision and high surface finish components. For example, it is used for metallographic specimens, drawing dies, clocks and other industrial gem bearings, moulding dies and stamping dies, gauges and block gauges, aircraft high-precision hydraulic transmission parts and internal combustion engine parts, precision instrument components, radar equipment, various transistors and fine grinding or polishing of gyroscope parts, etc. In addition, it is also used for the grinding of diamond, cemented carbide, glass, quartz, ceramics, ruby, sapphire, germanium, silicon and other hard and brittle material components, as well as the polishing of cast iron, steel, non-ferrous metals and alloy parts; titanium, tantalum, zirconium and other difficult-to-process rare metal parts for precision grinding, etc.
4. Diamond powder with tight particle size tolerance
The particle size tolerance of this kind of diamond powder does not exceed ±1m. Taking the 2-4m particle size class as an example, the particle size distribution percentage is as follows:
2.4 to 2.6m 0.2%; 2.6 to 2.8m 3.3%; 2.8 to 3.0m 7.0%; 3.0 to 3.2m 9.4%; 3.2 to 3.4m 10.8%; 3.4 to 3.6m 40.5%; 3.6 to 3.8m 18.6%; 3.8 To 4.0m 8.7%; 4.0 to 4.2m 1.5%.
This fine diamond micro powder is used in vital industrial sectors to eliminate technical problems caused by oversized particles.
5. Develop special diamond powder
Different diamond micro powders have their own characteristics. There is a kind of single crystal particle diamond powder, its particle is high-strength complete crystal, cubic octahedron shape, multi-edge cutting surface, not easy to peel off into useless (no cutting ability) fine grains, and metal binder has extremely effective retention, high strength and resistance to crushing and cracking under high temperature conditions, and has a good surface finish; another type of diamond micro powder is characterized by brittleness, and its particle shape is irregular quasi-round block shape, the surface is rough and uneven, and its brittleness causes the particles to break, resulting in new sharp cutting points. This kind of diamond micro powder is ideal for making resin bond grinding wheels, etc., and has a gentle fine grinding and polishing effect.