By R Edwards
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Additional resources for Cutting tools
TiN is an even better diffusion barrier than TiC but TiC has better abrasion resistance. 36 Coatings Fig. 20 37 TiN coating on High Speed Steel x 1000 In contrast to hardmetal, TiN is an excellent single layer coating for high speed steel. Figure 20 shows a cross section of a powder metallurgy high speed steel indexable insert x 1000. The light band at the top of the photomicrograph is the TiN layer which in this case is approximately 5 micrometres thick. The layer is fully dense and is very even in thickness.
Summarising The properties of sialons make them suitable for machining heat resisting alloys. They perform well on cast irons at high cutting speeds but are not suitable for general steel machining. 2 ALUMINIUM OXIDE-BASED CERAMICS In metal cutting the prime factor that has to be coped with is the heat generated during the machining operation. At around 800°C Al203 ceramics begin to show better mechanical properties than hardmetals, particularly in compression. Below 800 C hardmetals have superior strength compared with ceramics.
Round inserts can be used to machine hardmetal rolls containing 150/0 Co and over. A second CBN cutting material has been developed which incorpor- Cutting Materials 23 ates other hard compounds such as titanium carbide or titanium nitride. This reduces the thermal conductivity of this material to about 50% that of 'pure' CBN. Figures 12 and 13 show the microstructures x 1000 of 'pure' CBN and of TiC diluted CBN. They are known as high CBN content and low CBN content cutting materials respectively.
Cutting tools by R Edwards