High temperature electromagnetic coil assemblies

A high temperature electromagnetic coil assembly, comprising:

• a hermetically-sealed container;
• an electrically-insulative, high thermal expansion ceramic body housed within the hermetically-sealed container;
• and
• a coiled anodized aluminum wire embedded within the electrically-insulative, high thermal expansion ceramic body;
• wherein the coefficient of thermal expansion of electrically-insulative, high thermal expansion ceramic body is substantially matched to the coefficient of thermal expansion of the coiled anodized aluminum wire embedded therein.

A high temperature electromagnetic coil assembly, comprising:

• a coiled anodized aluminum wire;
• and
• an electrically-insulative, high thermal expansion ceramic body in which the coiled anodized aluminum wire is embedded;
• wherein the electrically-insulative, high thermal expansion ceramic body has a coefficient of thermal expansion greater than 10 parts per million per degree Celsius and less than the coefficient of thermal expansion of the coiled anodized aluminum wire;
• and
• wherein the electrically-insulative, high thermal expansion ceramic body comprises a low melt glass having a melting point less than the melting point of the anodized aluminum wire.