A process for producing a copper material for sputtering targets, purity of 99.99% or more
and a step of extruding between the high-purity copper 700 ~ 1000 ℃ hot rolling or heat at a heating temperature that is,
the heat-rolled or comprises the step of water-cooled immediately after the hot extrusion at a cooling rate of 50 ℃ / sec or more,
made from the high purity copper, sputtering surface, from the sputtering surface in the thickness depth direction
at 1/4 the thickness of the position sputtering surface and a plane parallel to, and thickness from the sputtering face
arithmetic grain size measured by the sputtering surface and a plane parallel to the 1/2 sheet thickness position in the depth direction
is the average is 100 ~ 200μm, respectively, In between each measurement plane and each measuring surface, binding
is the standard deviation of the crystal grain diameter is within 10μm, and, sputtering surface, the sputtering surface
and sputtering at 1/4 the thickness of the position in the thickness depth direction from plane parallel to the plane, and the sputtering
sputtering surface and measured in a plane parallel to the surface tering at half thickness position in the thickness depth direction
is the arithmetic mean of hardness that are each 51 ~ 100Hv, each During the measurement plane and the measurement plane
in the standard deviation of the hardness of copper materials for sputtering target is within 5Hv
and wherein the obtaining, the method for producing a copper material for the sputtering target.
Wherein
after the water cooling, the total cold rolling reduction is that the includes a step of cold rolling to be 30% or less
characterized and, copper materials for sputtering target according to claim 1 production method
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