In addition to being an abrasive, 17 applications of diamond part 3
Feb 18, 2023
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When we mention the use of diamond, we should think of making abrasive tools. In fact, it has a wide range of applications, friends, come and have a look~In addition to being an abrasive, 17 applications of diamond part 3(13-17).
13. Diamond tools are used to target microelectronics processing
Dr. John Patten of Western Michigan University in the United States developed a micro-laser-assisted processing technology called "μ-LAM". This method combines laser and diamond tools to heat, soften and cut silicon semiconductor and ceramic materials.
The "μ-LAM" processing device integrates an infrared fiber laser (wavelength range 1000-1500nm), and the laser beam irradiates the workpiece through a single-point diamond tool with high optical clarity, heating the workpiece material to 600 °C Above, diamond tools with a tip arc radius of 5 μm to 5 mm are bonded with epoxy resin (suitable for milliwatt-level laser power processing) or welding/brazing (suitable for 1-watt or greater laser power processing) way, connected to a laser housed in a tungsten or tungsten carbide housing.
μ-LAM processing technology can also cut processing time and processing costs, and achieve very smooth optical surfaces, Patten said. "When using conventional methods, if you want to manufacture an optical component (such as a mirror), you usually need to start with casting the blank of the workpiece, and then perform a series of processing steps: rough grinding, fine grinding, and grinding before it can be finally shaped. And our processing The method replaces the original series of processes, cutting with a single-point diamond tool on a CNC machine tool, and can also obtain a good surface roughness (Ra1 ~ 10nm). "
Patten said, "Our original goal was to target the optics and semiconductor industries, but now it seems likely that most of its applications will be in high-energy, high-temperature microelectronic devices. In the semiconductor industry, silicon wafers are the carrier of chips and integrated circuits. At higher temperatures, people use silicon carbide. So now almost all of our efforts are focused on silicon carbide processing.”
14. CVD diamond is used in new electric discharge machining electrodes
In EDM, the tool electrode is a very important factor. The performance of the electrode material will affect the EDM performance of the electrode, such as material removal rate, tool loss rate, workpiece surface quality, etc. Therefore, the correct selection of electrode material is important for EDM is essential.
K/Suzuki and others have studied the use of conductive CVD diamond thick film (0.5mm) as electrode material for EDM. This kind of CVD diamond has electrical conductivity by doping boron in the CVD process, has low resistance, high thermal conductivity, and has a strong adsorption capacity for the carbon precipitated in the oil working medium during EDM. Tests have shown that under certain processing conditions, CVD diamond electrodes can achieve a high material removal rate, while the electrode loss is almost zero, especially when it is processed at a high current density that cannot use Cu or graphite electrodes.
15. Application of artificial single crystal diamond in laser micro-hole drilling technology
In recent years, the integrated circuit industry has developed rapidly, which has also helped related industries, especially upstream basic industries, to flourish. As the key material of integrated circuits and large-scale integrated circuits, with the development of integrated circuits and semiconductor devices to package multi-leads, high integration and miniaturization, the technical indicators of bonding gold wires are also getting higher and higher, high purity, high temperature, The demand for ultra-fine and ultra-long wires has increased rapidly and greatly. Artificial single crystal diamond is an ideal material for integrated circuit lead dies. Research and development of single crystal diamond integrated circuit precision lead dies is an important task for scientific and technological workers all over the world.
Research by Zhang Qinjian and others pointed out that laser micro-drilling technology is an important method for the processing of artificial single crystal diamond integrated circuit lead molds, and it is difficult to achieve accurate apertures by using traditional laser numerical control drilling models. Our proposed new model of controlling workpiece rotation speed and laser pulse energy for laser drilling is effective.
Using a new numerical control model to carry out laser drilling on the lead mold of the integrated circuit, the precision of the hole shape is greatly improved, and the hole diameter of 3.5 μm can be obtained.
16. Used as wear-resistant diamond coating
American SP3 company can provide ultra-smooth nanocrystalline diamond with a surface roughness of less than 10nm to controllable microcrystalline products with a surface roughness of more than 10μm, which can be ideally applied to wear-resistant surfaces including seals and bearings. Microcrystalline diamond Thin films are very suitable for applications in the field of chemical mechanical polishing. These two CVD diamond film products are suitable for harsh conditions and demanding environments. They exhibit high hardness, low coefficient of friction, high wear resistance and excellent thermal conductivity than any other material.
At present, the wafer manufacturing industry is developing towards 22nm and smaller geometries in the processing environment of highly corrosive abrasives (including copper and tungsten), and diamond with controllable roughness is developing into a new type of material for chemical mechanical polishing .
17. Apply diamond film on the surface of tantalum spinneret
The spinneret is a key component in chemical fiber textiles, and its performance will affect many economic indicators such as spinning quality, productivity, and cost. In general, the material of the spinneret should meet the following requirements:
(1) Good machining performance;
(2) Good corrosion resistance, able to withstand the corrosion of acid and alkali environment;
(3) It has sufficient strength and hardness, can withstand certain impact and working pressure, and is not easy to deform during spinning;
(4) Low cost.
Spinnerets used in the chemical fiber industry have always used gold-platinum alloys in the past, and the manufacturing cost was too high. Now people are trying to use relatively cheap tantalum instead of gold-platinum alloys to make spinnerets. Tantalum spinnerets face the following two problems:
(1) Improve its hardness to prevent the spinneret from being scrapped due to deformation;
(2) Improve its corrosion resistance under alkaline working conditions.
Carburizing the tantalum substrate helps to improve the adhesion of the diamond film on its surface, so that the diamond film can be successfully deposited on the surface of the tantalum spinneret.
Diamond films with different particle sizes can be obtained on the surface of the tantalum spinneret by changing the process parameters of the hot wire CVD.
The finished diamond film tantalum spinneret prepared has the spinnability and spinning quality that reach or exceed the traditional spinneret, and can completely replace the gold-platinum spinneret, thus greatly reducing the production cost. At the same time, the diamond film particles The reduction of the diameter has a favorable effect on the hardness of the spinneret surface and the spinning quality.
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