Method for preparing high-compactness titanium or titanium alloy by using gel casting formation

A technology of gel injection molding and titanium alloy, applied in the field of powder metallurgy, can solve the problems such as the inability to use titanium alloy bearing structures, the low sintering density of hydrogenated dehydrogenation titanium powder, etc., and achieve the effect of low cost and high density

Inactive Publication Date: 2016-05-04
CHINA IRON & STEEL RES INST GRP +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing high-density titanium or titanium alloy by gel injection molding, so as to solv

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 - gel injection molding high density TC4 titanium alloy impeller

[0036] 1. The organic monomer β-hydroxyethyl methacrylate and the solvent toluene are configured into a premix solution in proportion of 30%:70%;

[0037] 2. Mix titanium hydride powder with an average particle size of 50 μm and aluminum vanadium alloy powder with an average particle size of 30 μm according to the formula of Ti-6Al-4V, and then add the mixed powder to the premixed liquid to form a low-viscosity slurry. The solid content is 52vol.%;

[0038] 3. After adding an initiator with a proportion of 0.5wt.% of the mass of the mixed powder and a catalyst with a proportion of 1.5% of the volume of the premixed liquid, the slurry is injected into the impeller mold, and the organic monomer is cross-linked and solidified to form an impeller blank;

[0039] 4. Dry the impeller body at 50°C for 8 hours in a vacuum drying oven;

[0040] 5. The impeller body was degreased by flowing argon at 40...

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Abstract

The invention belongs to the technical field of powder metallurgy, and in particular, relates to a method for preparing high-compactness titanium or a titanium alloy by using gel casting formation. Firstly, an organic monomer-beta hydroxyethyl methacrylate and solvent-toluene are prepared to premixed liquid; mixed powder of pure titanium hydride or titanium hydride and an alloy element is added for preparing pulp; an initiator-benzoyl peroxide and a catalyst-dimethylaniline are added for curing to obtain a blank; the blank is dried, degreased and sintered in vacuum to obtain a sintered body with a relative density of higher than 95%; and then, the cover-less hot isostatic pressure treatment is performed to obtain a titanium alloy part with high compactness (relative density higher than 99.5%). The method is low in cost, suitable for preparation of titanium or titanium alloy products with large size, complex shape and high compactness and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, in particular to a method for preparing high-density titanium or titanium alloy by gel injection molding. Background technique [0002] Titanium alloy has excellent properties such as low density, high specific strength, good corrosion resistance and strong heat resistance, and has broad application prospects in aerospace, petrochemical, electric power, automobile and other industries. However, high cost has become a key factor limiting its application, and the development of low-cost preparation processes has become a research hotspot in the titanium alloy industry. [0003] Compared with the traditional melting and casting process, powder metallurgy technology has the advantages of short process, near-net shape and high material utilization rate, which opens up a new direction for low-cost titanium alloys. Gel injection molding is a near-net powder forming process. This process is ba...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C14/00B22F3/22B22F3/04B22F3/10
CPCC22C1/05B22F3/04B22F3/1007B22F3/1039B22F3/225B22F2201/20B22F2998/10C22C14/00
Inventor 叶青陈宏霞张德明章万千郭志猛
Owner CHINA IRON & STEEL RES INST GRP
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