Titanium aluminum based powder metallurgy material for automobile engine exhaust doors and manufacturing method of titanium aluminum based powder metallurgy material

A technology of automobile engine and powder metallurgy, which is applied in engine components, machines/engines, mechanical equipment, etc., can solve the problems of inability to prepare fine-grained titanium-aluminum-based alloys, difficult to cut, and coarse structure, and achieves fine structure and small specific gravity. , the effect of uniform composition

Inactive Publication Date: 2012-06-13
CHANGCHUN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of conventional casting, forging, and sintering TiAl-based alloys, such as coarse structure, difficult cutting, and inability to prepare fine-grained TiAl-based alloys, and provide a powder metallurgy material for automobile engine exhaust valves.

Method used

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  • Titanium aluminum based powder metallurgy material for automobile engine exhaust doors and manufacturing method of titanium aluminum based powder metallurgy material
  • Titanium aluminum based powder metallurgy material for automobile engine exhaust doors and manufacturing method of titanium aluminum based powder metallurgy material
  • Titanium aluminum based powder metallurgy material for automobile engine exhaust doors and manufacturing method of titanium aluminum based powder metallurgy material

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Embodiment 1

[0034] Embodiment 1: The method of mechanical alloying is adopted, that is, the mixed powder is refined and pre-alloyed by high-energy ball milling. Obtained including Ti, Al, Nb simple substance and Ti 3 Al, TiAl, Ti 2 Nanoscale grains including intermetallic compounds such as Al. By controlling the ball milling process, the content of the metastable phase of the titanium-aluminum intermetallic compound and the uncombined Al powder in the mixed powder is controlled. Under the condition of great plastic deformation, the powder continuously undergoes cold welding and crushing. With the extension of ball milling time, the particle size of the powder becomes smaller and more uniform. from figure 1 (Ti-45.7Al-5.4Nb component mixed powder) scanning photo of the ball mill shows that after 8 hours, some powder particles still maintain the original powder shape, and the average particle size is 40-50 μm. With the gradual increase of the ball milling time, the powder particles conti...

Embodiment 2

[0037] Example 2: Figure 6 to Figure 10 It is the shape of Ti-47.5Al-6.8Nb after ball milling, and the powder refinement law is similar to the experimental results of Ti-45.7Al-5.4Nb. Such as Image 6 , Figure 7 , Figure 8 with Figure 9As shown, as the ball milling time increases, the powder gradually refines. Since the powder agglomerates and combines during the ball milling process, the particle size of the powder observed by the scanning electron microscope, especially the particle size of the powder in the late stage of ball milling, is mainly the particle size of the powder cluster. Figure 10 It shows the TEM morphology and diffraction pattern of powder particles after high-energy ball milling for 30 hours, from Figure 10 Very fine powder particles can be clearly observed, and due to long-time ball milling, amorphous halos and intermittent polycrystalline rings appear in the diffraction pattern, which indicates the existence of amorphous and nanocrystalline.

Embodiment 3

[0038] Embodiment 3: as Figure 11 to Figure 14 As shown, they are the morphologies of Ti-45.7Al-6.2Nb, Ti-45.7Al-6.8Nb, Ti-47.5Al-5.4Nb and Ti-47.5Al-6.2Nb respectively after ball milling. The expected effect of refinement and alloying.

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Abstract

The invention discloses a titanium aluminum based powder metallurgy material for automobile engine exhaust doors and a manufacturing method of the titanium aluminum based powder metallurgy material. The ingredient and the content (in atomic percent) of the metallurgy powder material include that Ti takes 45.7% to 48.9%, Al takes 45.7% to 47.5%, and Nb takes 5.4% to 6.8%; purity of powder is 99.5%, , granularity of each of Ti and Al is smaller than 50 mu m, and granularity of Nb is smaller than 70 mu m; the powder which is prepared according to certain ingredients passes through a high-energy ball mill, rotation speed of the ball mill is 330 r/min, ball-to-powder weight ratio is 12:1, ball milling time is 30 hours, both a powder weighing and preparing process and a ball milling process are realized under protection of argon, pre-ball-milling powdery particles are nanocrystalline, and parts of the powder are in combination reaction; powder after ball milling pre-synthesizing is placed in a mold to be in hot-pressing vacuum sintering; and a prepared TiAl based alloy exhaust door has ultra-fine grains/ nanocrystalline tissues, wherein the size of TiAl phase grains is smaller than 500nm, the size of Ti3Al phase grains is smaller than 100nm, ingredients are uniform, and performances are excellent.

Description

technical field [0001] The invention relates to a titanium-aluminum-based powder metallurgy automobile engine exhaust valve material and a manufacturing method thereof. Background technique [0002] At present, with people's pursuit of energy saving and high efficiency of products, advanced design concepts are often based on higher operating temperature, lighter weight and faster operating speed. However, the performance of conventional metal material systems used today is approaching their limits, and further development requires the development of new materials. It is now generally believed that titanium-aluminum intermetallic compounds based on intermetallic compounds TiAl and Ti3Al are most likely to meet the above design requirements, and are considered to be a new generation of lightweight high-temperature resistant structural materials with the most application potential. It is widely used in the production of components such as industrial and power plant turbines an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L3/02C22C30/00C22C1/04
Inventor 陈华刘利萍张景超
Owner CHANGCHUN UNIV OF TECH
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