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    • 2. 发明申请
    • COATING LAYER FOR CUTTING TOOLS
    • 切割工具涂层
    • US20130149527A1
    • 2013-06-13
    • US13695886
    • 2011-07-08
    • Seong Woo ChoHan Sung KimDong youl LeeDae Suk HanYoung Ho SeoSeoun Young AhnDong Bok Park
    • Seong Woo ChoHan Sung KimDong youl LeeDae Suk HanYoung Ho SeoSeoun Young AhnDong Bok Park
    • B26D7/00
    • B26D7/00C23C16/34C23C16/403C23C28/042C23C28/044C23C30/005Y10T428/265
    • Provided is a coating layer for cutting tools, as a hard coating layer stacked and formed in the sequence of a TiN layer, a TiCN layer, a bonding layer, an alumina (Al2O3) layer, and a cover layer from the bottom by using a chemical vapor deposition (CVD) method on a parent material, able to improve cutting performance, because surface residual stress of the coating layer may be maintained in a compressive stress state by adjusting a composition of the cover layer without using a separate additional process, such as a blasting operation, or a mixed process of CVD and physical vapor deposition (PVD), and simultaneously the cover layer may also be used as a wear-resistant layer.The coating layer according to present invention is formed on a surface of a parent material by using a CVD method, in which the coating layer includes an alumina layer formed of an α-phase, disposed on the parent material and composed of a composite structure having a columnar crystal structure and an equiaxed crystal structure mixed therein, and a cover layer formed of AlxTiySizCrwN (herein, x+y+z+w=1, x≧0.75, y≧0.2, 0≦z≦0.06, 0≦w≦0.08) and disposed on the alumina layer.
    • 提供一种用于切削工具的涂层,作为通过使用下述方法从底部以TiN层,TiCN层,结合层,氧化铝(Al 2 O 3)层和覆盖层的顺序层叠并形成的硬涂层 化学气相沉积(CVD)方法,能够提高切割性能,因为涂层的表面残余应力可以通过调节覆盖层的组成而保持在压缩应力状态,而不使用单独的附加工艺,例如 作为喷砂操作,或CVD和物理气相沉积(PVD)的混合过程,并且同时覆盖层也可以用作耐磨层。 根据本发明的涂层通过使用CVD法形成在母体表面上,其中涂层包括由α相形成的氧化铝层,其设置在母体材料上并由具有 在其中混合的柱状晶体结构和等轴晶体结构,以及由Al x Ti y Si z Cr w N(这里,x + y + z + w =​​ 1,x> = 0.75,y> = 0.2,0 @ z @ 0.06,0 w@0.08)并设置在氧化铝层上。