Method for joining and composite workpiece

摘要

The joining connection preform comprises a first joining member (1) having a surface (11), and a second joining member (2) having a surface (12) joined to the first surface. The first joining member has a first level of hardening intermetallic phase. The second joining member has a second level of hardening intermetallic phase. A first gradient coating having a surface is provided on the first joining surface, and has a level of hardening intermetallic phase, which is perpendicular to the first joining surface. The joining connection preform comprises a first joining member (1) having a surface (11), and a second joining member (2) having a surface (12), which is provided for joining to the first joining surface. The first joining member has a first level of hardening intermetallic phase. The second joining member has a second level of hardening intermetallic phase. A first gradient coating having a surface is provided on the first joining surface, and has a level of hardening intermetallic phase, which is perpendicular to the first joining surface and is increased from the first gradient coating surface to the first joining surface until the level of the hardening intermetallic phase of the first gradient coating surface has less or no deviation of the first level of hardening intermetallic phase of the first joining member. The intermetallic phase is gamma -phase. A second gradient coating having a surface is provided on the second joining surface, and has a level of hardening intermetallic phase, which is perpendicular to the second joining surface and is increased from the second gradient coating surface to the second joining surface until the level of the hardening intermetallic phase of the second gradient coating surface has less or no deviation of the second level of hardening intermetallic phase of the second joining member. The first gradient coating is provided as a coating on the first joining surface, and has a first height in a direction of the first gradient coating surface. The second gradient coating is provided as a coating on the second joining surface, and has a second height in a direction of the second gradient coating surface. The level of the hardening intermetallic phase of the first gradient coating is equal to the height of the first gradient coating. The level of the hardening intermetallic phase of the second gradient coating is equal to the height of the second gradient coating. Independent claims are included for: (1) a method for connecting members; and (2) a composite component.