Method of metallizing sintered ceramics

A method metallizing sintered ceramics comprising the step of coating a desired surface of a sintered silicon carbide ceramic having a surface roughness of at most 5 .mu.m with a paste, which comprises manganese powder dispersed in a dispersant, said manganese powder having a particle size smaller than the surface roughness, the step of removing the dispersant from said paste and forming a metal layer on the ceramic surface, and the step of heating the resultant structure to a temperature lower than the melting point of manganese for a time sufficient to effect a reaction between manganese atoms and silicon carbide.

A method of metallizing sintered ceramics comprising the step of placing a foil on a desired surface of a sintered silicon carbide ceramic, said foil being made of an alloy which contains 25 to 45% of manganese, the balance being copper, an alloy which contains 50 to 70% of manganese, the balance being nickel, or an alloy which contains 42 to 43% of manganese, the balance being titanium;

• and the step of heating said foil to a temperature of at least the melting point of said alloy, but lower than the melting point of manganese, under application of a pressure of at least 0.01 kg/mm.sup.2 to melt said foil to form a liquefied metal layer and to cause a reaction between silicon carbide and manganese atoms.

A method of metallizing sintered ceramics comprising the step of forming a metal layer of manganese or a mixed metal layer of manganese and another metal on a desired surface of sintered aluminum oxide by vacuum evaporation or sputtering, and the step of heating the resultant structure to a temperature lower than the melting point of manganese for a time sufficient to perform a reaction between manganese atoms and silicon oxide in the alumina ceramic.

A method of metallizing sintered ceramics comprising the step of coating a desired surface of a sintered alumina ceramic having a surface roughness of at most 5 .mu.m with a paste which comprises manganese powder dispersed in a dispersant, said manganese powder having a particle size smaller than the surface roughness, the step of removing the dispersant of said paste and forming a metal layer on the alumina surface, and the step of heating the resultant structure to a temperature lower than the melting point of manganese for a time sufficient to effect a reaction between manganese atoms and silicon oxide in the alumina ceramic.

A method of metallizing sintered ceramics comprising the step of placing a foil on a desired surface of a sintered alumina ceramic containing silicon oxide, said foil being made of an alloy which contains 25 to 40% of manganese, the balance being copper, an alloy which contains 50 to 70% of manganese, the balance being nickel, or an alloy which contains 42 to 43% of manganese, the balance being titanium;

• and the step of heating said foil to a temperature of at least the melting point of said alloy but lower than the melting point of manganese under application of a pressure of at least 0.01 kg/mm.sup.2 to melt said foil to form a liquefied metal layer and to cause a reaction betwen the silicon oxide in the alumina ceramic and manganese atoms in the manganese alloy.