Application of new CVD coating technology in super-hard material coating Previous page Reliable Air Release Valve, Air Safety valves, Air Valve For Pipeline, Air Relief Valve, choose the high quality Air Release Valve For Pipelines. Strainer Valve,Y Strainer Valve,Pipeline Strainers,Gas Strainer Valve Zhejiang Philic Fluid Control Co.,LTD , https://www.philicflow.com
A diamond film (10 μm) can be deposited on the surface of a cemented carbide or high speed steel tool by processes such as "hot wire CVD method", "plasma jet CVD method", and "flame combustion method". The mechanical and physical properties of CVD diamond films are between natural diamond and hot pressed polycrystalline PCD diamond, which can effectively process non-ferrous metals.
If the deposition time is increased, a thick film having a thickness of more than 0.5 mm can be deposited on the substrate or substrate (typically a silicon wafer). The thick film is peeled off from the substrate and cut into small pieces of a certain shape, and the small pieces are brazed on a base blade (generally a cemented carbide tool). CVD thick film diamond tools are used in a larger range than film coated tools. At CIMT2007, many domestic and foreign tool companies have CVD film diamond coated tool products, but only a few manufacturers have thick film products. Beijing Oriental Tiandi Superhard Material Tool Co., Ltd. can produce diamond thick film tool products and has many years of experience. Thick film cutters are used in a wide range of applications, including non-ferrous metals, non-metallic hard materials, and particle-reinforced composites.
Application of new PVD coating technology in super-hard material coating
The Department of Physics of Wuhan University uses a DC reactive magnetron sputtering method to deposit a carbon nitride (CxNy) super-hard coating film on the surface of the tool, with a thickness of only a few microns and a hardness of 40 to 50 GPa. CxNy coated tools cut black and non-ferrous metals.
The experimental data <br> <br> author of coated high speed steel and carbide cutting tools (blade) cutting performance for a long study, conducted many scientific experiments. I will introduce some experimental data as follows:
1 Under the same cutting conditions, the service life of the coated tool insert is 3 to 5 times higher than that of the uncoated tool (blade). Under the same cutting conditions, the cutting speed of the coated tool is 20~30% higher than that of the uncoated tool under the same tool life.
2 Under the same cutting conditions, the cutting tool (blade) has a lower cutting force than the uncoated one. Compared with uncoated blades, the main cutting force Fc can be reduced by 3%~4%, and the Fc of TiN or TiC/TiN coated blades can be reduced by 6%. Feed force is compared with uncoated blades. The decrease in Ff and depth of cut Fp is particularly significant. The Al2O3 coated insert and cutting force reduction effect is close to that of the TiN coated insert.
3 I have used CVD coated diamond thick film cutter to process silicon aluminum alloy, various hard aluminum, lead brass, oxygen-free copper, titanium iodide and fiber reinforced and particle reinforced composite materials, etc., have achieved good results. . But the tool used for ultra-precision cutting is not as effective as natural diamond tools.
4 I have used CxNy coated high-speed steel drill bits to drill holes in high-strength steel. Compared with uncoated drill bits, the service life of coated drill bits is increased by 7~9 times. Coating CxNy on other high speed steel tools also has a significant effect. CxNy has been applied to cemented carbide inserts to turn steel, and the effect is not satisfactory. Its service life does not exceed that of ordinary TiC coated carbide inserts.
China's tool coating technology is still far from the industrial developed countries, and the number of coated tools is also very far, accounting for only 20% of all tools. Among them, CNC machine tools and machining centers use much more, and on ordinary non-CNC machines, they are pitiful because of problems and prices. We should strive to improve the level of tool coating technology and application technology, and promote the application of coated tools to promote the improvement of cutting and mechanical manufacturing.
Advantages of coated tools and the latest technological developments (2)