High-temperature thermal extrusion moulding method of TiAl intermetallic compound material

An intermetallic compound and extrusion forming technology, which is applied in the direction of metal extrusion dies, etc., can solve the problems of difficult extrusion forming, fast heat dissipation of billets, and large deformation resistance, so as to reduce the preheating temperature and actual working temperature, and is easy to clean , The effect of small deformation resistance
CN101856675AInactive Publication Date: 2010-10-13HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2010-10-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a high-temperature thermal extrusion moulding method of a TiAl intermetallic compound material, which relates to a thermal extrusion moulding method of a TiAl intermetallic compound material. The invention aims to solve the problems of rapid heat radiation from blank to a die, large temperature reduction of blank, large deformation resistance, serious die damage and difficult extrusion moulding existing in the process of extruding the TiAl intermetallic compound material by adopting a traditional thermal extrusion technology. The method comprises the following steps of: firstly, manufacturing an extrusion sheath and a sheath cover; secondly, placing the extrusion sheath in an inner cavity of an extrusion female die and heating both the extrusion sheath and the extrusion female die at the temperature of 200-600 DEG C; thirdly, heating the extrusion blank of a TiAl intermetallic compound to 1150-1300 DEG C, then taking out and rapidly placing into the extrusion sheath; fourthly, covering the sheath cover; and fifthly, extruding after die assembly so that the extrusion blank of the TiAl intermetallic compound is extruded and moulded in the complete cover of the extrusion sheath and the sheath cover. The invention is used for the high-temperature thermal extrusion moulding of TiAl intermetallic compound materials.
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Description

technical field

[0001] The invention relates to a hot extrusion forming method of TiAl intermetallic compound material. Background technique

[0002] TiAl intermetallic compounds have low density, high specific strength, high specific modulus, and excellent high temperature resistance and oxidation resistance. It has great development potential and broad application prospects in aerospace, automotive and other industrial fields. However, TiAl intermetallics have L1 0 Type crystal structure, low crystal symmetry, few slip systems, hard and brittle mechanical properties below 1000 °C, very difficult to process and form, which is the main obstacle to its current popularization and application. For the extrusion processing of TiAl materials, it is usually required to use isothermal deformation at a temperature above 1200 ° C to proceed smoothly. However, the traditional isothermal hot extrusion process requires the mold temperature to be the same as the billet temperature, and...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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