化學蒸着法에 依한 TiN被覆 超硬合金 切削工具에 關한 硏究(第二報)

Abstract

WC-TiC-TaC-Co系의 超硬合金위에 TiN蒸着時 TiCl₄에서 TiN으로되는 理論的인 Yield( ?? )를 溫度 1,000℃K~1,500℃K範圍에서 計算하였으며 또한 TiCl₄分壓과 Substrate의 Co含量이 Deposition rate에 미치는 影響을 調査하였다. 이때 얻어진 結果는 Coating두께가 增加함에 따라 Coated Tool의 抗折力은 減少하며, Tool의 Co含量 增加에 따라 顯著하게 純化됨을 알 수 있었다. Coated Tool의 Surface Roughness는 蒸着溫度에 依해 支配를 받으며 TiN Coating의 微小硬度는 1,700~2,000kg/mm²값을 갖는다. TiN Coating을 하므로서 磨耗抵抗은 현저하게 增加하여 uncoated tool에 比해 Crater Wear resistance는 20倍, Flank Wear resistance는 6倍 增加함을 確認하였다.

In developing a TiN Coating for cobalt bonded WC-TiC-TaC, theoretical calculations of percent conversion of TiDl₄as a function of TiCl₄partial pressure were carried out in the temperature range of 1,000°K-1,500°K.

In addition, the effect of the TiCl₄partial pressure and cobalt content of the substrate on the deposition rate were investigated.

The transverse rupture strength is noticeably reduced by the coating, the extent of this decrease depending thickness.

Concerning the deposition of the smooth coating layers, it was oberved that surface roughness is influenced by deposition temperature.

The TiN coating had hardness balues of 1,700-2,000kg/mm².

The wear resistance of TiN layers is tested in turning steel and it was observed that Crater resistance is 20 times, Flank resistance is 6 times better than uncoated tools.

In developing a TiN Coating for cobalt bonded WC-TiC-TaC, theoretical calculations of percent conversion of TiDl₄as a function of TiCl₄partial pressure were carried out in the temperature range of 1,000°K-1,500°K.

In addition, the effect of the TiCl₄partial pressure and cobalt content of the substrate on the deposition rate were investigated.

The transverse rupture strength is noticeably reduced by the coating, the extent of this decrease depending thickness.

Concerning the deposition of the smooth coating layers, it was oberved that surface roughness is influenced by deposition temperature.

The TiN coating had hardness balues of 1,700-2,000kg/mm².

The wear resistance of TiN layers is tested in turning steel and it was observed that Crater resistance is 20 times, Flank resistance is 6 times better than uncoated tools.