Powder surface treatment agent, titanium or titanium alloy powder injection molding method and product

A technology of powder surface treatment and powder injection molding, which is applied in the field of powder metallurgy, can solve the problems of high cost and difficulty in densification, and achieve the effects of high density, improved operability and low impurity content

Active Publication Date: 2020-07-17
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0006] The main purpose of the present invention is to provide a powder surface treatment agent, titanium or titanium alloy powder injection molding method and products, the powder injection molding method forms an organic coating layer by coating the surface of HDH titanium or titanium alloy powder, which can inhibit The oxygen content of titanium or titanium alloy powder increases during injection molding, while preventing the powder from reacting with the binder, and polycarbosilane can generate TiC and Ti-Si-C ceramic particles in situ in the titanium matrix during sintering Reinforcing phase, which significantly improves the mechanical properties of the material, so as to solve the technical problems of high cost and difficulty in densification when using powder injection molding technology to prepare high-end titanium and titanium alloy products in the prior art

Method used

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  • Powder surface treatment agent, titanium or titanium alloy powder injection molding method and product
  • Powder surface treatment agent, titanium or titanium alloy powder injection molding method and product
  • Powder surface treatment agent, titanium or titanium alloy powder injection molding method and product

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preparation example Construction

[0035](1) Preparation of powder surface treatment agent: 3-aminopropyltrimethoxysilane, vinylbenzylaminoethylaminopropyltrimethoxysilane hydrochloride, 3-diethylenetriaminopropyltrimethoxysilane Dimethylsilane or N,N-dimethyl-3-aminopropyltrimethoxysilane is dissolved in toluene or xylene to obtain a solution with a mass volume concentration of 0.002-0.01g / mL, and then polycarbosilane (PCS) is dissolved A solution with a mass volume concentration of 0.003-0.05 g / mL is obtained in the above solution.

[0036] (2) Add hydrogenated dehydrogenated titanium or titanium alloy powder with a particle size median diameter D50 of 10-40 μm and an oxygen content less than or equal to 0.15wt.% to the powder surface treatment agent in step (1), seal the inert gas, and mechanically stir for 0.2 -0.9h, and then ultrasonically treated in an ultrasonic cleaner for 0.2-0.8h to prepare a slurry with a solid-to-liquid ratio of 1.2-3.5g / mL.

[0037] (3) Premix the slurry prepared in step (2) with ...

Embodiment 1

[0044] Using hydrogenated dehydrogenation titanium powder with a median particle size of 33.4 μm and an oxygen content of 0.14wt.% as raw material, the scanning electron microscope morphology photo is as follows figure 1 shown.

[0045] 0.5wt.% of 3-aminopropyltrimethoxysilane was dissolved in xylene organic solvent to prepare a solution with a concentration of 0.005g / mL, and then 0.5wt.% of polycarbosilane (PCS) was dissolved in the solution , prepared into a solution with a concentration of 0.01g / mL.

[0046] The raw material powder was added to the prepared solution, sealed with high-purity inert gas protection, magnetically stirred for 0.4h, and then ultrasonically treated in an ultrasonic cleaner for 0.3h to prepare a slurry with a solid-to-liquid ratio of 3.2g / mL.

[0047] Take out the prepared slurry and pre-mix with low melting point components 5wt.% HDPE, 5wt.% EVA and 8wt.% SA at a temperature of 130°C for 0.2h; then add high melting point components 82wt.% POM for ...

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Abstract

The invention discloses a powder surface treating agent, a titanium or titanium alloy powder injection molding method and a product. The powder surface treating agent comprises the following raw materials of polycarbosilane with the concentration of 0.003-0.05 g / mL, amino silane type coupling agents with the concentration of 0.002-0.01 g / mL, and an organic solvent. The titanium or titanium alloy powder injection molding method comprises the steps that titanium or titanium alloy powder is added into the powder surface treating agent to obtain slurry; and after the slurry and a binder are mixed,pelletizing, injection molding, degreasing, sintering and cooling are sequentially performed to obtain the titanium or titanium alloy product. According to the powder injection molding method, the surface of the HDH titanium or titanium alloy powder is wrapped to form an organic wrapping layer, the mechanical property of the material is improved, and accordingly the technical problems that when high-end titanium and titanium alloy products are prepared by a powder injection molding technology in the prior art, the cost is high and compacting is difficult are solved.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a powder surface treatment agent, a titanium or titanium alloy powder injection molding method and a product. Background technique [0002] Titanium and titanium alloys are widely used in various fields such as aerospace, marine engineering and medical materials due to their low density, high specific strength, excellent corrosion resistance and good biocompatibility. An important indicator of a country's advanced technological development level. However, at present, the preparation of titanium and titanium alloys is mainly through the traditional casting-pressing process, which has problems such as low production efficiency, high production cost, and difficulty in preparing parts with complex shapes, which seriously limits the industrial application level of titanium and titanium alloys. For the problem of preparation and molding, powder injection molding technology h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F3/22C22C1/05C22C14/00C22C32/00
Inventor 路新潘宇李维斌徐伟曲选辉
Owner UNIV OF SCI & TECH BEIJING
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