Process for producing ceramic member for bonding, ceramic member for bonding, vacuum switch, and vacuum vessel

A ceramic member for bonding, comprising:

• a ceramic base which is a sintered ceramic;
• a metallic layer formed by metallization, which is a lower layer comprising a nickel ingredient, a tungsten ingredient and a molybdenum ingredient provided on a surface of the ceramic base;
• and
• an alloy layer, which is an upper layer comprising a nickel ingredient and at least one of a copper ingredient and a manganese ingredient provided on a surface of the metallic layer directly or through an interlayer.

A bonded object comprising

• a ceramic member for bonding, comprising:
• a ceramic base which is a sintered ceramic;
• a metallic layer formed by metallization, which is a lower layer comprising a nickel ingredient, a tungsten ingredient and a molybdenum ingredient provided on a surface of the ceramic base;
• and an alloy layer, which is an upper layer comprising a nickel ingredient and at least one of a copper ingredient and a manganese ingredient provided on a surface of the metallic layer directly or through an interlayer, and
• another ceramic member for bonding, bonded to the ceramic member through at least the metallic layer of the ceramic member and the alloy layer of the ceramic member.