Material layer for high rotational speeds

A method for producing a material layer for a rotor of a dynamoelectric rotary machine with a rotational direction about a rotational axis arranged in a layer center of the material laver, wherein the material layer has a material recess arranged substantially at the layer center, wherein the material layer has a first region, wherein the first region has a first material with a first degree of strength, wherein the material layer has a substantially annular second region arranged concentrically to the layer center, wherein the second region has a second material with second degree of strength higher than the first degree of strength;

• wherein the first material and the second material are connected with a material bond, wherein the material layer has at least a first region, comprising a first material, and at least a second region comprising a second material, said method comprising:
• applying a first suspension having a binding agent and solid particles through a first screen onto a base to form a first green body, thereby reproducing from the first screen the first region of a first material with a first degree of strength;
• applying a second suspension having a binding agent and solid particles through a second screen onto a base to form a second green body, thereby reproducing from the second screen the second region of a second material with a second degree of strength which is higher than the first degree of strength;
• joining the first green body and the second green body such as to form a material recess substantially at a layer center, with the second region being annular and arranged concentrically to the layer center;
• and
• creating a permanent material bond of the first and second green bodies and the solid particles by heating and/or by compression, in particular by sintering.

A material layer for a rotor of a dynamoelectric rotary machine with a rotational direction about a rotational axis arranged in a layer center of the material layer, said material layer comprising:

• a material recess arranged substantially at the layer center;
• a first region of a first material with a first degree of strength;
• and
• a substantially annular second region connected to the first material with a material bond such as to form a material recess substantially at the layer center, with the second region arranged concentrically to the layer center and having a second material with a second degree of strength which is higher than the first degree of strength.