Microstructure of Highly Adhesive TiN-Ti(C, N)-bonding layer-a-Al2O3 Films Coated by CVD on Cemented Carbide Cutting Tools.
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- Ishii Toshi
- Magnetic & Electronic Materials Research Lab., Hitachi Metals, Ltd.
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- Shima Nobuhiko
- Narita Plant, Hitachi Tool Engineering, Ltd.
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- Ueda Hiroshi
- Narita Plant, Hitachi Tool Engineering, Ltd.
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- Gonda Masayuki
- Magnetic & Electronic Materials Research Lab., Hitachi Metals, Ltd.
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- Okayama Shirou
- Narita Plant, Hitachi Tool Engineering, Ltd.
Bibliographic Information
- Other Title
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- 硬質材料 高密着性α‐Al2O3膜被覆切削工具のミクロ組織
- コウミッチャクセイ アルファーAl2O3 マク ヒフク セッサク コウグ ノ ミクロ ソシキ
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Abstract
The microstructure of highly adhesive CVD coated α-Al2O3 films on cemented carbide cutting tool inserts have been investigated. These inserts are coated with a TiN layer, a MT(moderate temperature)-Ti(C, N) layer, a bonding layer, and a α-Al2O3 layer by using CVD.<BR>SEM, TEM, and TEM-EDX were used to characterize the coatings, and following characteristics were found.<BR>(1) The bonding layer is composed of Ti, C, N, and O or of Ti, C, and O. Its crystal structure is a face centered cubic one with a lattice parameter of 0.431nm.<BR>(2) Each grain in the bonding layer continues crystallographically from the MT-Ti(C, N) layer grains.<BR>(3) There are crystalline planes running between a grain of the bonding layer and a grain of the a-Al2O3 layer.<BR>(4) Vertical-plane-shape projections are formed on the surface of bonding layer.<BR>The last three characteristics are considered to be the cause for improved α-A12O3 layer adherence and longer tool life.<BR>A crystallographical model shows that the above mentioned microstructure is consistent to X-ray diffraction result which shows the (110) plane of α-Al2O3 layer is oriented to the parallel of the insert's surface.
Journal
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- Journal of the Japan Society of Powder and Powder Metallurgy
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Journal of the Japan Society of Powder and Powder Metallurgy 46 (4), 422-426, 1999
Japan Society of Powder and Powder Metallurgy
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Details
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- CRID
- 1390282681285991680
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- NII Article ID
- 10002262351
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- NII Book ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- NDL BIB ID
- 4701645
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed