The 15th International Plansee Conference was held at the WaHerSchwarzkoptHaus Conference Center in Reutte, Tyrol, Austria. 500 delegates from 40 countries and regions participated in the conference. At the meeting, some experts exchanged research progress on hard materials.
The meeting discussed the development of ultrafine and nano-grain cemented carbides and cutting tools for extreme conditions. Mr. GGill of German HCStarck Company and users of other manufacturers commented on the great development of submicron cemented carbide in the past ten years and pointed out that among various factors that affect the improvement of alloy performance, ultra-fine grain materials Development has played an important role. For example, the particle size of tungsten carbide (WC) powder has been reduced to sub-micron level, even as low as 0.2μm. For the application of submicron grain cemented carbide, GGille believes that the output of submicron grain cemented carbide in the world (including China) was between 11,500 and 12500 tons in 2000, accounting for 40% of the total output of cemented carbide. Among them, cemented carbide drills and cemented carbide milling cutters account for the largest share, reaching 60%, about 7000 ~ 7500t, and these applications are still growing rapidly; micro-drills for the electronics industry account for 13%; wear-resistant parts, Circuit board scissors, paper and plastic cutters, chipless forming tools, dental tools, etc. accounted for 18%; woodworking tools accounted for 4%; metal cutting blades accounted for 5%. Microdrills for processing printed circuit boards are one of the first and most important applications of submicron cemented carbides, and their consumption has been increasing rapidly. In the past 15 years, the micro-drill speed has increased from 80,000r / min to 180,000r / min, and the drill diameter has been reduced from 500μm to 200μm. The diameter of the latest generation of micro-drills has been reduced to 70 μm.
In the sub-micron cemented carbide application market, metal cutting inserts only account for a relatively small share. Tests have shown that sub-micron carbide metal cutting inserts are reliable for milling automotive cast iron parts and aluminum alloy parts, and it can be expected that it will have certain growth in this application field, especially ultra-fine (0.16μm) grain hard Carbide.
Mr. FFriedrichs of Konrad Friedrichs in Germany believes that shaft machining tools also have a tendency to gradually transition from high-speed steel tools to solid carbide tools. 0.5μm) has become the standard milling cutter and profile cutter. FFriedrichs is convinced that 6% to 12% Co K grades with an alloy grain size of 1.5 to 0.2 μm may occupy 90% of the application market, and the production process of carbide and cemented carbide still has a very broad research and development space.
In this meeting, the characteristics of ultra-fine carbide powder were discussed. Austria's ABock and BZeiler discussed the use of CRC (calcination-reduction-carbonization) process to produce submicron powder, and pointed out that adding chromium before calcination can control the growth of grains, which is due to additives It can be evenly distributed on the grain boundaries between carbide particles. WGrogger of the Austrian University of Technology and his colleagues and Planzi Tizit used advanced analytical electron microscopy to study the chemical composition and distribution of additives in cemented carbides made with submicron powders. They found that in a cemented carbide doped with chromium and vanadium elements, there is a vanadium carbide film on the interface between tungsten carbide grains and on the grain boundaries without chromium.
The University of Tokyo in Japan and KKitamura of Toshiba Tangerui Company and their colleagues respectively discussed a new type of WC-Co cemented carbide made from complex (Co, W) tungsten carbide. The tungsten carbide of the alloy has a plate-like structure and has Anisotropy, its fracture toughness value is 10% to 15% higher than conventional cemented carbide, and its hardness level is consistent.
At the meeting, the delegates also conducted technical exchanges on cutting tools such as ceramics, cermets, diamond tools and coated blades and their coating processes used under extreme conditions (such as dry cutting of difficult-to-machine materials).
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