Research On The Properties Of Nano-modified Ti(C, N)-based Cermets And Their Millers

The nano-modified Ti(C, N)-based cermet was a kind of new cutting material, which was made by powder metallurgy method on the foundation of traditional TiC based cermets through addition of nano TiN particles. It has a important place in industry owing to its combinations of high red-hardness, low friction coefficient, good wear resistance, excellent corrosion resistance and low cost, etc. In the paper, the nano-modified Ti(C, N)-based cermets for the milling tools and the properties of millers were investigated by material science and metallurgy and maching principle, which expects to present theoretical instruction for preparation of high performance cermets and enrich materials design theory.Firstly, the effect of the binder phases and the addition of Mo on the microstructures and mechanical properties of the nano-modified Ti(C, N)-based cermets for the milling tools were studied. The results showed that the effects of the binder phases on transverse rupture strength and hardness of the materials were obvious. The additions of Mo to nano-modified Ti(C, N) solid solution could decrease rupture toughness of the cermets.Secondly, Two kinds of new nano-modified Ti(C, N)-based cermet inserts (24Ni and 12Co12Ni) were fabricated and used for milling normalized 45-carbon steel. Results indicated that the inserts of thel2Col2Ni exhibited better impact than that of the 24Ni at high milling speed. And two kinds of millers would be failured in the form of " wear" and a long time of tools can be obtained at last.Thirdly, the surface worn topography and the chemical constitutions of the testing inserts were analyzed by SEM coupled with EDS. High temperature diffusion and oxidation in the surface of inserts, which caused the changes of composition and decrease of properties of the cermets, accelerated the wear of the inserts...