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Titanium/aluminum solid-liquid composite casting forming method

A technology of casting molding and solid-liquid compounding, which is applied in the field of material processing engineering, can solve the problems of many cracks and holes, thick interface reaction layer, complex process, etc., and achieve the effect of high bonding strength and few defects such as cracks and holes

Active Publication Date: 2014-05-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The content of the present invention is to overcome the deficiencies of the prior art, and to prepare titanium-aluminum composite castings with a solid-liquid composite method, aiming to solve the complex process, poor repeatability, limited product shape and size, The interface reaction layer is thick and uneven, there are many defects such as cracks and holes, and the interface bonding strength is not high, etc.

Method used

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  • Titanium/aluminum solid-liquid composite casting forming method
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  • Titanium/aluminum solid-liquid composite casting forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: pure titanium / pure aluminum composite casting

[0032] Grade and composition of industrial pure titanium:

[0033] TA2 Industrial pure titanium, mass fraction: Fe≤0.3%, C≤0.08%, H≤0.015%, O≤0.25%, N≤0.03%, other elements ≤0.10% and total ≤0.40%, the rest is Ti.

[0034] Industrial pure aluminum grade and composition:

[0035] 1A80 industrial pure aluminum, its mass fraction: containing Si≤0.15%, Fe≤0.15%, Cu≤0.03%, Mn≤0.02%, Mg≤0.02%, Zn≤0.03%, Ca≤0.03%, V≤0.05%, Ti≤0.03%, other elements≤0.02%, and the rest is Al.

[0036] Specific steps:

[0037](1) Mechanically treat and chemically clean the surface of the TA2 titanium rod with a size of Φ6×60mm (6mm in diameter and 60mm in length) after machining to remove oil and oxides on the surface. The mechanical treatment is to grind with 400#, 600#, 800#, 1000#, 1500#, 2000# sandpaper in order to obtain the required roughness on the surface of the titanium rod; the chemical cleaning is to use 5% NaOH solution...

Embodiment 2

[0042] Embodiment 2: Titanium alloy / pure aluminum composite casting

[0043] Titanium alloy grade and composition:

[0044] TC4 (Ti-6Al-4V) titanium alloy, its mass fraction: Al5.5-6.75%, V3.5%-4.5%, Fe≤0.30%, C≤0.08%, H≤0.015%, O≤0.20%, N ≤ 0.05%, other elements ≤ 0.10% and the total ≤ 0.40%, the rest is Ti.

[0045] Grade and composition of industrial pure aluminum:

[0046] 1A80 industrial pure aluminum, its mass fraction: containing Si≤0.15%, Fe≤0.15%, Cu≤0.03%, Mn≤0.02%, Mg≤0.02%, Zn≤0.03%, Ca≤0.03%, V≤0.05%, Ti≤0.03%, other elements≤0.02%, and the rest is Al.

[0047] Specific steps:

[0048] (1) Mechanically treat and chemically clean the surface of the TC4 titanium alloy rod with a size of Φ6×60mm (6mm in diameter and 60mm in length) after machining to remove oil and oxides on the surface. The mechanical treatment is to grind with 400#, 600#, 800#, 1000#, 1500#, 2000# sandpaper in order to obtain the required roughness on the surface of the titanium alloy rod; the...

Embodiment 3

[0053] Embodiment 3: titanium alloy / aluminum alloy composite casting

[0054] Titanium alloy grade and composition:

[0055] TC4 (Ti-6Al-4V) titanium alloy, its mass fraction: Al5.5-6.75%, V3.5%-4.5%, Fe≤0.30%, C≤0.08%, H≤0.015%, O≤0.20%, N ≤ 0.05%, other elements ≤ 0.10% and the total ≤ 0.40%, the rest is Ti.

[0056] Aluminum alloy grade and composition:

[0057] 7050 aluminum alloy, its mass fraction: containing Zn5.7%-6.7%, Cu2.0%-2.6%, Mg1.9%-2.6%, Zr0.08%-0.15%, Si≤0.12%, Fe≤0.15% , Cr ≤ 0.04%, Mn ≤ 0.10%, Ti ≤ 0.06%, other elements ≤ 0.05% and the total ≤ 0.15%, the rest is Al.

[0058] Specific steps:

[0059] (1) Mechanically treat and chemically clean the surface of the TC4 titanium alloy rod with a size of Φ6×60mm (6mm in diameter and 60mm in length) after machining to remove oil and oxides on the surface. The mechanical treatment is to grind with 400#, 600#, 800#, 1000#, 1500#, 2000# sandpaper in order to obtain the required roughness on the surface of the tit...

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Abstract

The invention relates to a titanium / aluminum solid-liquid composite casting forming method, and belongs to the field of material processing engineering. The method is to prepare an aluminum-encapsulated titanium casting by placing solid titanium alloy in aluminum alloy melt, and a laboratory preparation technology comprises the following implementation steps of (1) obtaining a titanium alloy bar with a 3mm to 30mm diameter in a processing way, and turning and polishing the aluminum alloy bar for an ideal surface roughness; (2) chemically cleaning the surface of the prefabricated titanium bar to remove greasy dirt and oxides on the surface; (3) smelting the aluminum melt in a corundum crucible by adopting a pit type resistance furnace; (4) inserting the titanium bar which is previously completely processed into the melt at the temperature of 670 DEG C to 840 DEG C; (5) implementing heat preservation in the pit type furnace for 5 minutes to 15 hours, then taking the titanium bar out, and cooling the titanium bar in air to a room temperature. According to the titanium / aluminum solid-liquid composite casting forming method, the metallurgical bonding between pure titanium and pure aluminum, between titanium alloy and pure aluminum and between titanium alloy and aluminum alloy is realized by a solid-liquid composite casting method; an obtained composite casting is integrated with the characteristics i.e. lightness and corrosion resistance of titanium alloy and aluminum alloy, and has the performances, i.e. high strength and high toughness of the titanium alloy and easy heat transfer, electric conduction and the like of the aluminum alloy.

Description

technical field [0001] The invention belongs to the field of material processing engineering and relates to a titanium / aluminum solid-liquid compound casting method. Background technique [0002] The content of aluminum in the earth's crust is second only to oxygen and silicon, ranking third, and is the most abundant metal element in the earth's crust. Aluminum alloy has a small specific gravity, high electrical conductivity and corrosion resistance, and high thermal conductivity, and its price is relatively low compared to other metals. It has been widely used in actual production and has been widely used in aviation, Aerospace, weapons, ships, transportation and other industries. However, the impact resistance of aluminum alloy is poor, and its performance is greatly reduced in high temperature and corrosive environments. Compared with aluminum alloys, titanium alloys have excellent properties as structural materials, such as: corrosion resistance, high temperature resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/02
Inventor 李宏祥庄林忠聂新宇刘君城张济山
Owner UNIV OF SCI & TECH BEIJING
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