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Method for semi-continuously preparing TiAl base alloy automobile air valve and components with similar shape

A semi-continuous, alloy-based technology, which is applied in the field of preparation of automobile air valves and parts with similar shapes, can solve the problems of high smelting cost, difficulty in forming automobile air valves, difficult alloy liquid and high casting superheat, and improve production efficiency , prevent oxygenation, control the effect of interaction

Active Publication Date: 2008-02-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this preparation technology are: the cost of two smelting is high, and at the same time, for materials with high melting point and high activity, it is difficult to make the alloy liquid obtain a high degree of casting superheat (generally not exceeding 80°C) during casting with water condensation shell, resulting in Difficult to mold automotive air valves with large slenderness ratio (L / Φ)

Method used

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  • Method for semi-continuously preparing TiAl base alloy automobile air valve and components with similar shape
  • Method for semi-continuously preparing TiAl base alloy automobile air valve and components with similar shape

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The semi-continuous suction casting of titanium-aluminum-based alloy automobile valves and parts of similar shapes adopts the method shown in Figure 1. Of course, it is not limited to this. The TiAlB valve is suction-cast on a 50kg vacuum suction casting furnace. The composition is shown in Table 1. The suction casting process for:

[0028] 1. Raw materials are sponge Ti, industrial pure Al, TiB 2 ;

[0029] 2. Put the above raw materials into a CaO crucible for vacuum induction melting;

[0030] 3. The casting shell mold is composed of the air valve and other parts mold shell 1, the intermediate flow plate 2 and the suction casting pipe 3. The length direction of the air valve components is evenly distributed perpendicular to the intermediate flow plate; the preheating temperature is 50-800°C (this embodiment (300°C) shell mold is installed in the suction casting chamber, and is connected with the suction casting pipe. The combined furnace vacuumizes the melting cham...

Embodiment 2

[0038] The difference from Example 1 is that the TiAlB gas valve is suction-cast on a 50kg vacuum suction casting furnace, and the composition is shown in Table 2.

[0039] Table 2 Composition of air valve

[0040] the element

[0041] The shell mold with a preheating temperature of 300°C is installed in the suction casting chamber and is connected with the suction casting pipe. The combined furnace evacuates the melting chamber and the suction casting chamber respectively. Introduce 0.6atm argon gas to start melting the alloy. The frequency of the melting power is 3300Hz. After the melting, use infrared and contact thermocouples to measure the temperature. When the superheat reaches 120°C, insert the suction casting tube into the molten metal and turn on The valve starts suction casting. During the suction casting process, the flow control valve is used to adjust the suction casting speed. The pressure difference of vacuum suction casting is 6×10 4 Pa.

Embodiment 3

[0043] The difference from Example 1 is that the TiAlB gas valve is suction-cast on a 50kg vacuum suction casting furnace, and the composition is shown in Table 3.

[0044] Table 3 Composition of air valve

[0045] the element

[0046] The shell mold with a preheating temperature of 500°C is installed in the suction casting chamber and is connected with the suction casting pipe. The combined furnace evacuates the melting chamber and the suction casting chamber respectively. Introduce 0.5atm of argon gas to start melting the alloy. The frequency of the melting power is 3600Hz. After the melting, use infrared and contact thermocouples to measure the temperature. When the superheat reaches 120°C, insert the suction casting tube into the molten metal and open the valve. Start the suction casting. During the suction casting process, adjust the suction casting speed through the flow control valve. The pressure difference of the vacuum suction casting is 5×10 4 Pa.

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Abstract

The present invention relates to preparative technique for automobile air valve and parts of similar shape, specifically speaking, the present invention is a semi-continuous method for preparing TiA1-based alloy automobile air valve and parts of similar shape. The present invention adopts the method of vacuum pouring after semi-continuous induction melting in a vacuum pouring furnace: take the spongy titanium, industrial pure aluminum and other alloy elements as the raw materials and adopt a CaO formed ceramic pot for vacuum induction melting; the cast shell mold consists of part mold shell such as air valve, etc., intermediate flow trays and a vacuum pouring pipe; the intermediate flow trays are evenly distributed in the lengthwise direction of the air valve part; the technique parameters of the vacuum pouring are that the shell mold temperature is between 50 to 800 Celsius degrees and the vacuum pouring pressure difference is2.0 multiplied by 104-7.0 multiplied by 104Pa. The present invention can semi-continuously produce parts which have complicated shapes and are hard to be formed with high-melting point, high-activity Ti A1-based materials and the cost is low; in addition, the produced automobile air valve boasts of excellent internal quality and stable casting performance.

Description

technical field [0001] The invention relates to the preparation technology of automobile air valves and parts with similar shapes, in particular to a method for semi-continuously preparing TiAl-based alloy automobile air valves and parts with similar shapes. Background technique [0002] At present, foreign technologies for casting TiAl-based alloy automobile valves are plasma smelting master alloys and casting alloy valves in water-condensed shell furnaces. The disadvantages of this preparation technology are: the cost of two smelting is high, and at the same time, for materials with high melting point and high activity, it is difficult to make the alloy liquid obtain a high degree of casting superheat (generally not exceeding 80°C) during casting with water condensation shell, resulting in It is difficult to form an automobile valve with a large slenderness ratio (L / Φ). Contents of the invention [0003] The purpose of the present invention is to provide a TiAl-based al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/06
Inventor 马颖澈刘奎陈波高明赵秀娟张顺南
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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