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

Inactive Publication Date: 2010-10-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of fast heat dissipation from the billet to the mold, large temperature drop of the billet, large deformation resistance, serious damage to the die and difficulty in extrusion forming when the traditional hot extrusion technology is used to extrude the TiAl intermetallic compound material. A kind of high temperature hot extrusion forming method of TiAl intermetallic compound material

Method used

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

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specific Embodiment approach 1

[0007] Specific implementation mode one: combine figure 1 and figure 2 Describe this embodiment, this embodiment is realized through the following steps: The described method is realized through the following steps: Step 1, make extruded sheath 2 and sheath cover 3: extrude sheath 2 and sheath cover 3 The raw materials are all composed of 40%-60% graphite powder, 30%-50% low-melting glass powder and 5%-15% hollow floating bead powder according to the weight percentage. Example preparation, mixing in a powder mixer or a ball mill, on a mechanical press, use a mold to press the mixed extrusion sheathing powder raw material into a shape and size of the inner cavity that matches the shape of the TiAl intermetallic compound extrusion billet 5 and the upper end It is an open extruded sheath 2; the raw materials of the sheath cover 3 are prepared according to the above weight percentage, mixed in a powder mixer or a ball mill, and pressed on a mechanical press by using a mold to co...

specific Embodiment approach 2

[0008] Specific embodiment two: the TiAl intermetallic compound extrusion billet 5 described in step one of this embodiment is Ti 3 Al, Ti 2 Al, TiAl, TiAl 3 or TiAl 2 Nb. The above materials are Ti-Al intermetallic compound materials. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0009] Embodiment 3: When heating the TiAl intermetallic compound extrusion billet 5 described in step 3 of this embodiment, argon gas is filled into the heating furnace. Doing so can prevent the oxidation of the TiAl intermetallic compound extrusion billet 5 at a high temperature of 1150°C to 1300°C. Other steps are the same as in the first embodiment.

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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.

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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/02B21C25/02B21C29/00B21C29/04
Inventor 胡连喜王欣叶磊王尔德王珩刘祖岩
Owner HARBIN INST OF TECH
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