Diamond-like film superhard material coating

The emergence of technologies such as CVD and PVD is a major revolution in the field of cutting tools. Its appearance immediately caused great repercussions in the field of mechanical manufacturing. The ideal cutting tool should have both a hard surface and high toughness, and the coating technology achieved this goal. The earliest coating materials are ceramic materials, such as TiN, TiC, Al2O3, etc. In recent years, coating technology has been greatly developed. Ultra-hard material coatings are being fully applied, and many products have appeared on the market one after another, but the domestic is still in the experimental stage, and it is expected to break through soon. The development of super-hard material coatings makes the performance of the entire existing cutting tools. Both have been significantly improved. In the face of the current large number of difficult-to-machine materials, these newly developed coating technologies will have great adaptability and the prospects are quite gratifying.
There are three main types of superhard material coatings, namely diamond-like, diamond and CBN. These coating materials are pure diamond or pure CBN, so the hardness is the same as the deposited material. Compared with PCD and PCBN, the hardness and wear resistance are greatly improved because they do not contain a binder.
The properties of the diamond coating and the CBN coating are the same as those of the raw materials, but only the film, and the same as the ceramic coating.
The diamond-like film is highlighted here.
Diamond-Like Carbon (DLC) film has similar performance to diamond film, its anti-friction and wear performance is good, and the DLC film preparation process is becoming more and more mature, which can obtain large area and rough surface at very low deposition temperature. A small DLC film, while a diamond film requires a higher deposition temperature (about 800 ° C ~ 1000 ° C), therefore, many matrix materials are limited, such as high-speed steel, and it is difficult to deposit evenly over a large area, the surface is also Rough. Therefore, the DLC film is more easily used in many applications, such as a protective film for a magnetic disk.
In the use of coated cutting tools, as with ceramic coatings, the coating substrate must also be handled well. Generally, the cemented carbide of the matrix is ​​YG8. The pretreatment process is firstly polished with W1 diamond micropowder, and the surface is decobalted for 15 min. The decobalted solution is a 1:3 nitric acid aqueous solution, and then ultrasonically cleaned in acetone for 10 min. The cleaning work is extremely important before the substrate is applied. If it is a cutting tool, it must be ensured that it cannot be annealed during sharpening.
Due to the short history of superhard material coating technology, it is still developing. I believe it will be more perfect than the ceramic coating technology.
The synthesis technology and application research of thick-film diamond diamond film have developed rapidly around the world, forming a “diamond film heat”. In the past ten years, the method of gas phase synthesis has developed to more than twenty kinds. Generally, the deposition rate is only 1~2μm per hour. How to accelerate the deposition rate has been the subject of research. In the near future, the deposition rate has developed to above 100 μm/h, up to 930 μm/h. We call it thick film diamond. China Oriental Tiandi Diamond Research Institute successfully mastered this technology, the largest deposition thickness reached 2.3mm. It has now been commercialized and entered the international advanced ranks.
Thick film diamond differs from PCD in that it has no binder and is pure diamond, so its hardness is much higher. Unlike natural diamond, it is isotropic and low cost, so it will replace PCD in many aspects. Used as a wire drawing die will be even wear, so the wire quality of the wire drawing is significantly better than the natural diamond die. If the quality of deposition is further improved, there is also the possibility of replacing natural diamond in ultra-precision processing, so it is highly valued in the field of ultra-precision.

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