(WO9713731-A2)      A high temp. fuel cell has at least two overlying layers (2, 10) including at least one electrically insulating layer (2), which contains a periodically repeating sequence of two or more overlying ceramic layers (4, 6) of different compsns.    Also claimed is a method of producing the above fuel cell in which the individual ceramic layers (4, 6) are produced by successively spraying ceramic densely onto the layer (10), by atmospheric plasma spraying, flame spraying, high velocity flame spraying or vacuum or low pressure flame spraying.    ADVANTAGE -   The insulating layer has maximised insulating properties, good adhesion and mechanical stability.    (EP867046-A2)      A high temp. fuel cell has at least two overlying layers (2, 10) including at least one electrically insulating layer (2), which contains a periodically repeating sequence of two or more overlying ceramic layers (4, 6) of different compsns.    Also claimed is a method of producing the above fuel cell in which the individual ceramic layers (4, 6) are produced by successively spraying ceramic densely onto the layer (10), by atmospheric plasma spraying, flame spraying, high velocity flame spraying or vacuum or low pressure flame spraying.    ADVANTAGE -   The insulating layer has maximised insulating properties, good adhesion and mechanical stability.    (US5939219-A)      A high temp. fuel cell has at least two overlying layers (2, 10) including at least one electrically insulating layer (2), which contains a periodically repeating sequence of two or more overlying ceramic layers (4, 6) of different compsns.    Also claimed is a method of producing the above fuel cell in which the individual ceramic layers (4, 6) are produced by successively spraying ceramic densely onto the layer (10), by atmospheric plasma spraying, flame spraying, high velocity flame spraying or vacuum or low pressure flame spraying.    ADVANTAGE -   The insulating layer has maximised insulating properties, good adhesion and mechanical stability.    (JP11515136-W)      A high temp. fuel cell has at least two overlying layers (2, 10) including at least one electrically insulating layer (2), which contains a periodically repeating sequence of two or more overlying ceramic layers (4, 6) of different compsns.    Also claimed is a method of producing the above fuel cell in which the individual ceramic layers (4, 6) are produced by successively spraying ceramic densely onto the layer (10), by atmospheric plasma spraying, flame spraying, high velocity flame spraying or vacuum or low pressure flame spraying.    ADVANTAGE -   The insulating layer has maximised insulating properties, good adhesion and mechanical stability.    (EP867046-B1)      A high temp. fuel cell has at least two overlying layers (2, 10) including at least one electrically insulating layer (2), which contains a periodically repeating sequence of two or more overlying ceramic layers (4, 6) of different compsns.    Also claimed is a method of producing the above fuel cell in which the individual ceramic layers (4, 6) are produced by successively spraying ceramic densely onto the layer (10), by atmospheric plasma spraying, flame spraying, high velocity flame spraying or vacuum or low pressure flame spraying.    ADVANTAGE -   The insulating layer has maximised insulating properties, good adhesion and mechanical stability.