High strength connecting method for TiAl base alloy charging turbine and steel shaft

A supercharged turbine and connection method technology, applied in the direction of welding medium, metal processing, welding equipment, etc., can solve the problems of low joint strength, high joint brittleness, joint cracking, etc., to solve the problem of long operation period, improve high temperature mechanical properties, The effect of raising the operating temperature

Inactive Publication Date: 2006-03-22
HARBIN INST OF TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that Ni-based superalloy supercharged turbine has a large proportion of Ni-based alloy, and poor start-up and stop response are easy to occur during the working process of the engine, and the adoption of TiAl-based alloy turbine and steel shaft adopts diffusion connection, and there is joint brittleness There are many phases, and the quality of the joints is difficult to guarantee; using friction welding, the joints are more brittle, which is easy to cause joint cracking, and it is impossible to weld small-sized test pieces; using ordinary brazing, there is a problem of low joint strength. High-strength connection method between alloy supercharged turbine and steel shaft

Method used

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  • High strength connecting method for TiAl base alloy charging turbine and steel shaft
  • High strength connecting method for TiAl base alloy charging turbine and steel shaft
  • High strength connecting method for TiAl base alloy charging turbine and steel shaft

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specific Embodiment approach 1

[0006] Specific implementation mode one: combine figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 Describe the present embodiment, the high-strength connection method of the TiAl-based alloy supercharged turbine and the steel shaft of the present embodiment is completed by the following steps: a, process the external thread 1-1 on the outer wall of the TiAl-based alloy supercharged turbine connecting shaft 1, Process the steel shaft 2 along the axial direction to form an internally threaded sleeve 2-1 that matches the externally threaded connecting shaft of the TiAl-based alloy turbocharger 4 and an axial process through hole 2-2 that communicates with the internally threaded sleeve 2-1; b. Coating AgCuNiLi solder paste 3 on the inner wall of the internally threaded sleeve 2-1, said AgCuNiLi solder paste 3 is mixed with AgCuNiLi solder powder and binder according to the ratio of 9 to 11:1 by weight Prepared by stirring, the AgCuNiLi solder powder is com...

specific Embodiment approach 2

[0007] Specific implementation mode two: combination figure 1 , figure 2 Describe this embodiment, the difference between this embodiment and specific embodiment 1 is: in step a of this embodiment, the outer wall of the TiAl-based alloy supercharger turbine connection shaft 1 is processed with a fine-pitched external thread, and the steel shaft 2 is threaded along the In the axial direction, a fine-thread internal thread sleeve matching the fine-thread external thread connecting shaft of the TiAl-based alloy turbocharger 4 and an axial process through hole 2-2 communicating with the fine-pitch internal thread sleeve are processed. The use of fine threads can ensure the connection strength and rigidity between the TiAl-based alloy turbocharger 4 and the steel shaft 2 .

specific Embodiment approach 3

[0008] Specific embodiment three: the difference between this embodiment and specific implementation one is: in the b step of this embodiment, the AgCuNiLi solder paste 3 is coated on the inner wall of the fine tooth internal thread sleeve, and the AgCuNiLi solder paste 3 It is prepared by mixing and stirring AgCuNiLi solder powder and binder according to the weight ratio of 9:1, and the AgCuNiLi solder powder is composed of the following components according to weight percentage: Cu: 22.6%, Ni: 4.4% , Li: 0.9%, and the remainder of Ag, the adhesive is prepared by mixing and stirring hydroxyethyl cellulose and distilled water according to a weight ratio of 1:100. The AgCuNiLi solder paste 3 made with the above technical parameters is suitable for the condition that the diameter of the connecting shaft 1 of the TiAl-based alloy turbocharger is not large.

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Abstract

The high strength connecting process for TiAl base alloy charging turbine and steel shaft includes the following steps: A. machining outer thread in the TiAl base alloy charging turbine and machining inner thread sleeve in the steel shaft and axial technological through hole; B. painting AgCuNiLi brazing paste to the inner wall of the inner thread sleeve; C. assembling the TiAl base alloy charging turbine and the steel shaft together; and D. brazing the assembled TiAl base alloy charging turbine and steel shaft. The present invention has high connection strength.

Description

technical field [0001] The invention relates to a connection method of a turbocharger and a steel shaft, in particular to a high-strength connection method of a TiAl-based alloy turbocharger and a steel shaft. Background technique [0002] In fields such as aerospace, military chariots and limousines, turbocharging is generally used to improve engine performance. Turbochargers are mostly made of Ni-based high-temperature alloys. Ni-based alloys have a large specificity, and the engine is prone to problems of poor start-up and stop response during operation. In order to solve such problems, it is necessary to find a light-weight high-temperature-resistant material to replace Ni-based alloys. Since TiAl-based alloys have the advantages of low density, high specific strength, high specific stiffness, high-temperature mechanical properties and good oxidation resistance, if the supercharger can be made of light-weight and high-temperature-resistant TiAl-based alloys instead of N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P11/00B23K1/00B23K35/30
Inventor 冯吉才何鹏李玉龙张九海
Owner HARBIN INST OF TECH
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