Brazing agent and a brazing sheet both comprising an aluminum alloy containing a flux

A flux-containing aluminum alloy brazing agent consisting essentially of a compacted powder mixture of an aluminum element, a silicon element, the flux and one or more elements selected from a group consisting of zinc, tin and indium,

• wherein said silicon element, said zinc element, said tin element and said indium element are contained at 3-15%, 0.1-5%, 0.01-0.5%, 0.01-0.5% by weight of all the elements other than the flux, respectively;
• and
• the ratio in weight of all the elements other than the flux to the flux is from 99.9:0.1 to 70:30, and wherein the apparent density is 90% or more of a theoretical density.

A brazing agent as defined in claim , wherein silicon element is contained at 6-12% by weight of all the elements other than the flux.

A brazing sheet comprising:

• a core sheet made of aluminum or its alloy;
• a skin layer a flux clad to at least one of front and back surfaces of the core sheet, and having a thickness of 10 .mu.m or more for each surface, the skin layer having an apparent density and being a compacted powder mixture,
• said compacted powder mixture consisting essentially of an aluminum element, a silicon element and a flux so that the silicon element is contained in the skin layer at 3-15% by weight of all the elements other than the flux, wherein the ratio in weight of all the elements other than the flux to the flux is from 99.9:0.1 to 70:30, and wherein the apparent density is 90% or more of a theoretical density.

A flux-containing aluminum alloy brazing agent consisting essentially of a compacted powder mixture of an aluminum element, a silicon element, a copper element and the flux wherein silicon is contained at 3-15% by weight of all the elements other than the flux, the copper is contained at 0.05-5% by weight of all the elements other than the flux, and the ratio in weight of all the elements other than the flux to the flux is from 99.9:0.1 to 70:30, and wherein the apparent density is 90% or more of a theoretical density.

A flux-containing aluminum alloy brazing agent consisting essentially of a compacted powder mixture of an aluminum element, a silicon element, a copper element, the flux and one or more elements selected from a group consisting of zinc, tin and indium, wherein said silicon element, said copper element, said zinc element, said tin element and said indium element are contained at 3-15%, 0.05-5%, 0.1-5%, 0.01-0.5%, 0.01-0.5% by weight of all the elements other than the flux, respectively;

• and the ratio in weight of all the elements other than the flux to the flux is from 99.9:0.1 to 70:30, and wherein the apparent density is 90% or more of a theoretical density.

A brazing sheet comprising:

• a core sheet made of aluminum or its alloy;
• a skin layer a flux clad to at least one of front and back surfaces of the core sheet, and having a thickness of 10 .mu.m or more for each surface, the skin layer having an apparent density and being a compacted powder mixture, said compacted powder mixture consisting essentially of an aluminum element, a silicon element, a copper element and a flux so that the silicon element is contained in the skin layer at 3-15% by weight of all the elements other than the flux, the copper element is contained in the skin layer at 0.05-5% by weight of all the elements other than the flux, and the ratio in weight of all the elements other than the flux to the flux is from 99.9:0.1 to 70:30, and wherein the apparent density is 90% or more of a theoretical density.

A brazing sheet comprising:

• core sheet made of aluminum or its alloy;
• a skin layer clad to at least one of front and back surfaces of the core sheet, and having a thickness of 10 .mu.m or more for each surface, the skin layer having an apparent density and being a compacted powder mixture, and said compacted powder mixture consisting essentially of an aluminum element, a silicon element, a copper element, a flux and one or more elements selected from a group consisting of zinc, tin and indium, so that the silicon element, copper element, zinc element, tin element and indium element are contained at about 3-15%, 0.05-5%, 0.1-5%, 0.01-05%, 0.01-0.5% by weight of all the elements other than the flux, respectively;
• wherein the ratio in weight of all the elements other than the flux to the flux is from 99.9:0.1 to 70:30, and wherein the apparent density is 90% or more of a theoretical density.