Sealing structure, method of soldering and process for preparing sealing structure

A sealing structure comprising a first board made of a material selected from the group consisting of ceramics and metals, a second board also made of a material selected from the group consisting of ceramics and metals, a metallic frame located in the pepripheral space between said first and second boards, a first jointing member which seals a peripheral space between said frame and said first board, and a second jointing member which seals a peripheral space between said frame and said second board,

• wherein said first jointing member comprises at least a first layer selected from the group consisting of an aluminum layer and an aluminum alloy layer, a second layer having a melting point lower than that of said first layer, and a solder layer having a melting point lower than that of said second layer.

A method of soldering at least two members selected from the group consisting of ceramics and metals,

• which comprises heat jointing aluminum and/or aluminum alloy to one of said two members, heat jointing a material selected from the group consisting of zinc, zinc alloy, magnesium, and magnesium alloy to the surface of said aluminum and/or aluminum alloy, and soldering the other member thereto.

A process for preparing a sealing structure comprising two ceramic members opposed to each other and a frame which has been jointed to each of said ceramic members,

• which comprises a step of jointing one of said two ceramic members to one side of said frame with a first high-melting jointing material and jointing a second high-melting jointing material to the other side of said frame, a step of jointing a medium-melting jointing material which melts at a lower temperature than said first and second high-melting jointing materials to the surface of said second high-melting jointing material which has been jointed to the other side of said frame, and a step of jointing said medium-melting jointing material to the other ceramic member of said two ceramic members opposed to each other with a low-melting jointing material which melts at a lower temperature than said medium-melting jointing material, wherein said first and second high-melting jointing materials each comprise aluminum and/or aluminum base alloy, and wherein said medium-melting jointing material comprises a material selected from the group consisting of zinc, zinc base alloy, magnesium, and magnesium base alloy.

A process for preparing a sealing structure comprising two ceramic members opposed to each other and a frame which has been jointed to each of said ceramic members,

• which comprises a step of jointing one of said two ceramic members to one side of said frame with a first high-melting jointing material and jointing a second high-melting jointing material to the other side of said frame, a step of jointing a medium-melting jointing material which melts at a lower temperature than said first and second high-melting jointing materials to the surface of said second high-melting jointing material which has been jointed to the other side of said frame, and a step of jointing said medium-melting jointing material to the other ceramic member of said two ceramic members opposed to each other with a low-melting jointing material which melts at a lower temperature than said medium-melting jointing material, wherein said first and second high-melting jointing materials each comprise a core material comprised of aluminum or aluminum base alloy and a skin material comprised of an aluminum-silicon base alloy provided on both sides thereof.

A process for preparing a sealing structure comprising two ceramic members opposed to each other and a frame which has been jointed to each of said ceramic members,

• which comprises a step of jointing one of said two ceramic members to one side of said frame with a first high-melting jointing material and jointing a second high-melting jointing material to the other side of said frame, a step of jointing a medium-melting jointing material which melts at a lower temperature than said first and second high-melting jointing materials to the surface of said second high-melting jointing material which has been jointed to the other side of said frame, wherein said second high-melting jointing material is jointed to said medium-melting jointing material through an intermediate member comprising an iron base material, aluminum base material or copper base material, said intermediate member having a melting temperature higher than that of said high-melting jointing material, and a step of jointing said medium-melting jointing material to the other ceramic member of said two ceramic members opposed to each other with a low-melting jointing material which melts at a lower temperature than said medium-melting jointing material.