Improvement of mechanical properties and application for cutting tools of TiB<sub>2</sub>-base thin films

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  • TiB<sub>2</sub>ベース薄膜の機械的特性向上と切削工具への応用
  • TiB₂ベース薄膜の機械的特性向上と切削工具への応用
  • TiB ₂ ベース ハクマク ノ キカイテキ トクセイ コウジョウ ト セッサク コウグ エ ノ オウヨウ

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Abstract

TiB2 base thin films have been prepared by DC magnetron sputtering with a sintered TiB2+B target to obtain high cutting performance against stainless steel used as an airplane material. The critical loads (adhesive strength) and microhardness of TiB2+α films were higher than those of TiB2 films. The TiB2+α-based Ti-B-C films with C content of about 50% had good frictional properties compared to TiB2+α film, and the friction coefficients decreased from 0.8 to 0.4. Cemented tungsten carbide cutting tools were coated with Ti-B-C film with high adhesive strength, high hardness, and low frictional properties. Chips formed with the Ti-B-C coated tool were smoother than those formed with uncoated tools.

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