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Method for preparing TiAl alloy by adopting vacuum fusion casting method

A vacuum melting furnace and vacuum technology, applied in the field of preparation of non-ferrous metal materials, can solve the problems of high brittleness of castings, and achieve the effects of high compactness, simple process and high yield

Inactive Publication Date: 2010-09-08
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of high brittleness of castings in TiAl alloys, the purpose of the present invention is to provide a new method for preparing TiAl alloys, which can effectively reduce the occurrence of casting cracks, improve the quality of castings, and obtain TiAl alloys with stable properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1 adopts vacuum casting method to prepare TiAl alloy, and its method step is as follows:

[0014] a. Mold baking: first put the graphite mold into the intermediate frequency furnace, bake it at 700°C for 5 minutes, and then put it into the vacuum melting furnace, which uses a CaO crucible.

[0015] b. Charging: metal Al and metal Ti are added to the CaO crucible of the vacuum melting furnace, wherein the Ti block is 1.92kg, and the Al block is 1.08kg;

[0016] c. Vacuuming: pumping the vacuum in the vacuum melting furnace below 2.0Pa;

[0017] d. Melting and casting: When the vacuum degree in the vacuum melting furnace reaches below 2.0Pa, the temperature starts to rise. The heating rate is 12°C / min, the melting temperature is 1400°C, and the temperature is kept for 17 minutes;

[0018] e. Casting: After the metal Al and metal Ti are purified, they are cast into the baked graphite mold, and the casting is performed at a speed of first fast and then slow, an...

Embodiment 2

[0022] Embodiment 2 adopts vacuum casting method to prepare TiAl alloy, and its method step is as follows:

[0023] a. Mold baking: put the graphite mold into an intermediate frequency furnace and bake it at 800°C for 3 minutes, then put it into a vacuum melting furnace, which is a CaO crucible;

[0024] b. Charging: metal Al and metal Ti are added to the CaO crucible in the vacuum melting furnace, wherein the Ti block is 2.24kg, and the Al block is 1.26kg;

[0025] c. Vacuuming: the vacuum in the vacuum melting furnace should be pumped below 2.0Pa;

[0026] d. Melting and casting: When the vacuum degree in the vacuum melting furnace reaches below 2.0Pa, the temperature rises, the heating rate is 18°C / min, the melting temperature is 1500°C, and the temperature is kept for 20 minutes;

[0027] e. Casting: After the metal Al and metal Ti are purified, they are cast into baked graphite molds, and the casting is performed at a speed of first fast and then slow, and the casting is...

Embodiment 3

[0028] Embodiment 3 adopts vacuum casting method to prepare TiAi alloy, and its method step is as follows:

[0029] a. Mold baking: put the graphite mold into an intermediate frequency furnace and bake it at 900°C for 4 minutes, then put it into a vacuum melting furnace, which is a CaO crucible;

[0030] b. Charging: metal Al and metal Ti are added to the CaO crucible in the vacuum melting furnace, wherein the Ti block is 2.56kg, and the Al block is 1.44kg;

[0031] c. Vacuuming: the vacuum in the vacuum melting furnace should be pumped below 2.0Pa;

[0032] d. Melting and casting: When the vacuum degree in the vacuum melting furnace reaches below 2.0Pa, the temperature rises, the heating rate is 15°C / min, the melting temperature is 1800°C, and the temperature is kept for 23 minutes;

[0033] e. Casting: After the metal Al and metal Ti are purified, they are cast into baked graphite molds, and the casting is performed at a speed of first fast and then slow, and the casting is...

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Abstract

The invention relates to a method for preparing a TiAl alloy by adopting a vacuum fusion casting method, comprising the following steps of: a, putting a graphite mold into an oven, drying the graphite mold at the temperature of 700-900 DEG C for 3-5 minutes, and putting the graphite mold into a vacuum fusion oven; b, feeding: adding metal Al and metal Ti into the vacuum fusion oven; c, evacuating: evacuating in the vacuum fusion oven below 2.0Pa; d,fusion casting: setting the heating rate to be12-18 DEG C / min and the fusion temperature to be 1400-1800 DEG C; and e, casting: after fusing the metal Al and the metal Ti, casting the metal Al and the metal Ti into the dried graphite mold to prepare the TiAl alloy material. The method for preparing a TiAl alloy by adopting a vacuum fusion casting method has simple process and low cost, and the prepared TiAl alloy material has high compactness and yield.

Description

technical field [0001] The invention relates to a preparation technology of nonferrous metal materials, in particular to a preparation technology of TiAl alloy. Background technique [0002] TiAl alloy and its processed target are mainly used for multi-arc ion coating. Coating on the machining tool can significantly improve the service life of the tool and the processing accuracy of the product. TiAl alloy has outstanding characteristics such as high activity, high melting point, high alloy element content, large melting difference, and high melting reaction heat. There are serious quality problems such as cracks. Contents of the invention [0003] In order to solve the problem of high brittleness of castings in TiAl alloys, the purpose of the present invention is to provide a new method for preparing TiAl alloys, which can effectively reduce the occurrence of casting cracks, improve the quality of castings, and produce TiAl alloys with stable properties. [0004] The p...

Claims

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Application Information

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IPC IPC(8): B22D18/06
Inventor 张红军王玲玲杨平
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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