Cobalt Interlayed TiN-coated Tungsten Carbide Cutting Tool’s Performance Ⅺ

In last part we have experiments showing that the tool life of TiN-coated tool with Co interlayer was improved to 36% compared to the TiN-coated tools, and all data analysis verified that the tool wear distributions for each cutting time represent the distribution where the normal distributions and log-normal distributions are consistent. And in earlier parts we have talked about how we prepare those experiments and what data have been got concerning the performance of tungsten carbide cutting tool’s with an extra layer between the substrate and the TiN coating. Here we will come to a final conclusion although this does not mean an end to the relative research work.

4. Conclusions

TiN and TiN with three kinds of Co interlayer coatings were applied to end-mill tools made of WC-Co material by hybrid coating technique. The thin Co interlayer having the critical thickness (0.027μm) enhanced the adhesion between TiN coating layer and WC-Co substrate. The highest critical load of approximately 84 N was obtained for the TiN coating with Co interlayer thickness of 0.027μm. The critical scratch load was strongly dependent on the thickness of Co interlayer. The tool life of TiN-coated tool with Co interlayer having the critical thickness of 0.027μm was improved by over 36% compared to TiN-coated tools.  From  the  test  of  goodness  of  fit,  all experimental data were within the range of  ± 3σ. The flank wear of TiN-coated tool with Co interlayer at a given cutting time is suitable for  normal  distribution  and  log-normal  distribution by chi-squared test.

(This article is totally divided into 11 parts and here is part 11, for part 10 please read: http://news.chinatungsten.com/en/tungsten-information/78775-ti-10028)

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