Enhanced Al2O3-Ti(C,N) multi-coating deposited at low...

Details Enhanced Al2O3-Ti(C,N) multi-coating deposited at low... Enhanced Al2O3-Ti(C,N) multi-coating deposited at low...

2001-03-27

2004-02-10

Turner, Archene (Department: 1775)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

C407S118000, C407S119000, C428S336000, C428S469000, C428S472000, C428S698000, C428S701000, C428S702000, C051S307000, C051S309000

Reexamination Certificate

active

06689450

ABSTRACT:

BACKGROUND OF THE INVENTION
Multi-layers of &kgr;-Al
2
O
3
and Ti(C,O) or &kgr;-Al
2
O
3
and TiN have proved to exhibit better wear properties than single oxide layers, see U.S. Pat. No. 5,700,569 and U.S. Ser. No. 09/717,006.
The deposition process of these prior art multi-layers is, however, relatively long and deposition is usually carried out at relatively high temperatures (usually at about 1000° C.), resulting in the transformation of kappa-alumina to alpha-alumina. The volume shrinkage encountered in the phase transformation will reduce adhesion of the alumina layers. As a result, adhesion problems in production will occur.
It has usually been thought that deposition temperatures of about 1000° C. or higher are needed to deposit Al
2
O
3
coatings. As shown in the recent U.S. application Ser. No. 09/498,344, Al
2
O
3
can be deposited at the deposition temperatures about or exceeding 800° C., but less than 1000° C. Further, it was shown that the two Al
2
O
3
phases, &kgr; and &ggr;, could be deposited in a controlled way.
It has recently been confirmed that Ti(C,N) exhibits better wear resistance against crater wear and flank wear in hypoeutectoid steels than TiN (U.S. Ser. No. 09/207,687). In recent in-house cutting tests, it has also been found that in hypereutectoid steel, Ti(C,N) is better that TiN, especially with respect to flank wear. In hyper-eutectic steel, Al
2
O
3
is a superior coating material against crater wear. In recent cutting tests in-house, it has also been found that the adhesion of both &kgr; and &ggr; phases to the MTCVD Ti(C,N) deposited at 800° C. is surprisingly good. By depositing &kgr; or &ggr; with MTCVD Ti(C,N) as a multi-layer, the wear properties of the prior art TiN/Ti(C,O)-&kgr; multi-layers could thus be enhanced.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of this invention to avoid or alleviate the problems of the prior art.
It is further an object of this invention to provide enhanced wear properties of TiN/Ti(C,O)-&kgr; multi-layers by depositing &kgr; or &ggr; with MTCVD Ti(C,N) as a multi-layer.
In one aspect of the invention there is provided a coated body wherein the coating comprises a multi-layer of &ggr;-Al
2
O
3
.
In another aspect of the invention there is provided a coated body wherein the coating comprises a multi-layer of &kgr;-Al
2
O
3
and/or &ggr;-Al
2
O
3
layers interspersed with layers of Ti(C,N) on a layer of Ti(C,N).
In another aspect of the invention there is provided a coated body wherein the coating comprises a multi-layer of &kgr;-Al
2
O
3
and &ggr;-Al
2
O
3
, each applied by a chemical vapor deposition at a temperature of from 700 to 900° C.
In another aspect of the invention there is provided a coated body wherein the coating comprises a multi-layer of &kgr;-Al
2
O
3
and/or &ggr;-Al
2
O
3
layers interspersed with layers of Ti(C,N) on a layer of Ti(C,N).
In yet another aspect of the invention there is provided a coated body wherein the coated comprises a multi-layer of &kgr;-Al
2
O
3
and/or &ggr;-Al
2
O
3
layers interspersed with layers of Ti(C,N) on a layer of Ti(C,N) and with a layer of Ti(C,N) atop of the said multi-layer.


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U.S. patent application Ser. No. 09/498,244, Ruppi, filed Feb. 4, 2000.
U.S. patent application Ser. No. 09/717,006, Sulin et al., filed Nov. 22, 2000.

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