Sandvik Aktiebolag

Lars-Anders Budzynski

Björn Ljungberg

Bj&ouml;rn Ljungberg

According to the present invention there is provided a body at least partially coated with one or more refractory layers of which at least one layer essentially consist of &#x3b1;-AlO. Said &#x3b1;-AlOlayer consists of essentially equiaxed grains with an average grain size of &#x3c;1 &#x3bc;m and with a bimodal grain size distribution with coarser grains with an average grainsize in the interval 0.5-1 &#x3bc;m and finer grains with an average grainsize of &#x3c;0.5 &#x3bc;m. The AlOlayer further contains striated zones containing titanium (&#x3e;5 at %) but no nitrogen or carbon. This particular microstructure is obtained by temporarily stopping the gases needed for the growth of the AlOlayer and introducing TiCl.

Oxide coated cutting tool

According to the present invention there is provided a body at least partially coated with one or more refractory layers of which at least one layer essentially consist of &agr;-Al O . Said &agr;-Al O layer consists of essentially equiaxed grains with an average grain size of <1 &mgr;m and with a bimodal grain size distribution with coarser grains with an average grainsize in the interval 0.5-1 &mgr;m and finer grains with an average grainsize of <0.5 &mgr;m. The Al O layer further contains striated zones containing titanium (>5 at %) but no nitrogen or carbon. This particular microstructure is obtained by temporarily stopping the gases needed for the growth of the Al O layer and introducing TiCl .

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Huddinge, Sweden

Lars-Anders Budzynski