Heat shield element, method and mold for the production thereof, hot-gas lining and combustion chamber

A method to make a ceramic heat-shield element, comprising:

• compressing or casting a base material mixture;
• adjusting material properties of different material zones of the base material mixture;
• and
• sintering the pressed or casted base material mixture,
• wherein a first material property is a coefficient of thermal expansion, and
• wherein the adjusting includes:
• creating a first material zone in the heat shield element including a first coefficient of thermal expansion, and
• creating a second material zone in the heat shield element including a second coefficient of thermal expansion which differs from the first coefficient of thermal expansion, and wherein the first and second coefficients of thermal expansion are numerically optimized so that the stresses in the heat shield element are minimized using a calculation of a temperature field in the heat shield element set up in a desired operating state, wherein the ceramic heat-shield element comprises:
• a hot side disposed to face toward a hot medium, and
• a cold side disposed to face away from the hot medium,
• the method further comprising connecting the cold side and the hot side of the ceramic heat-shield element at least by way of a pair of mutually opposed peripheral surfaces, and
• arranging the second coefficient of thermal expansion of the second material zone to be higher relative to the first coefficient of thermal expansion of the first material zone, wherein the second material zone comprises the pair of mutually opposed peripheral surfaces of the ceramic heat-shield element.