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Sintered titanium alloy and preparation method thereof

A titanium alloy, vacuum sintering technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of unfavorable alloy structure and performance, influence and other problems

Active Publication Date: 2019-12-03
长沙得悦科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rare earth silicides are compounds that are more conducive to practical applications, but the introduction of excessive silicon elements will also adversely affect the microstructure and properties of alloys

Method used

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  • Sintered titanium alloy and preparation method thereof
  • Sintered titanium alloy and preparation method thereof
  • Sintered titanium alloy and preparation method thereof

Examples

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Effect test

preparation example Construction

[0035] A "press-vacuum sintering" preparation method for sintering rare earth-like titanium alloys, comprising the following steps:

[0036] The first step: mixing powder

[0037] Take 200-400 mesh HDH titanium powder (oxygen content 0.25-0.40wt.%) and mix CeN powder (0.2-0.8wt.%) or NdN powder (0.2-0.8wt.%) with a powder particle size of 2-5 μm, mix The process was carried out under the protection of nitrogen at an atmospheric pressure.

[0038] Step 2: Compression molding

[0039] The mixed powder is placed in a mold and pressed into shape by a press, and the pressing pressure is 200-600Mpa.

[0040] Step 3: Sintering

[0041] Heat the pressed sample to 500°C-600°C at a heating rate of 2-10°C / min, keep it warm for 0.5-1h, and then raise the temperature to 1250°C-1380°C at a heating rate of 5-10°C / min, the vacuum degree is 1×10 -3 to 5×10 -4 Pa between.

[0042] A method for preparing a sintered titanium alloy, comprising the steps of:

[0043] The first step: mixing ...

Embodiment 1

[0056] The first step: mixing powder

[0057] 200 mesh HDH titanium powder (oxygen content 0.25wt.%) was mixed with CeN powder (0.4wt.%) or NdN powder (0.4wt.%) with a particle size of 5 μm, and the mixing process was carried out under the protection of nitrogen at an atmospheric pressure.

[0058] Step 2: Compression molding

[0059] The mixed powder is placed in a mold and pressed into shape by a press, and the pressing pressure is 200-600Mpa.

[0060] Step 3: Sintering

[0061] Heat the pressed sample to 500°C-600°C at a heating rate of 2-10°C / min, keep it warm for 0.5-1h, and then raise the temperature to 1250°C-1380°C at a heating rate of 5-10°C / min, the vacuum degree is 1×10 -3 to 5×10 -4 Pa between. The specific mechanical properties data are shown in Table 1.

[0062] Table 1 Example 1 sample mechanical property data summary

[0063]

[0064] The sintering temperature of the present invention is above 1200°C. During sintering, the rare earth nitrides decompos...

Embodiment 2

[0066] The first step: mixing powder

[0067] 200-400 mesh HDH titanium powder (oxygen content 0.25-0.40wt.%) is mixed with NdN powder (0.2-0.8wt.%) with a particle size of 5 μm, and the mixing process is carried out under the protection of nitrogen at an atmospheric pressure.

[0068] Step 2: Compression molding

[0069] The mixed powder is placed in a mold and pressed into shape by a press, and the pressing pressure is 200-600Mpa.

[0070] Step 3: Sintering

[0071] Heat the pressed sample to 500°C-600°C at a heating rate of 2-10°C / min, keep it warm for 0.5-1h, and then raise the temperature to 1330°C at a heating rate of 5-10°C / min, with a vacuum of 5×10 -4 Pa. The specific mechanical properties data are shown in Table 2.

[0072] Table 2 Example 2 sample mechanical property data summary

[0073]

[0074] Adding a small amount of rare earth nitride powder can increase the relative density during the sintering process, but as the mass fraction of nitride powder conti...

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Abstract

The invention discloses a sintered titanium alloy and a preparation method thereof. The titanium alloy is prepared from, by weight, 0.2-0.8% of rare earth nitride and the balance HDH titanium powder,and the preparation method comprises the following specific steps: firstly, mixing the raw materials to obtain mixed powder; 2, carrying out compression molding on the mixed powder obtained in the step 1 to obtain a green body; or mixing the mixed powder obtained in the first step with an adhesive to obtain a feed; carrying out injection molding on the feed to obtain an injection blank; degreasingthe injection blank to obtain a degreased green body; and 3, subjecting the green body obtained in the second step to vacuum sintering, and obtaining the sintered titanium alloy. By adding the rare earth nitride into the titanium alloy, the effect of capturing oxygen can be achieved, no by-product is generated, no residue is left, and the titanium alloy is relatively safe. And meanwhile, the rareearth nitride has the advantage of low price, the cost can be reduced, and the application field is expanded.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy preparation, and in particular relates to a sintered titanium alloy and a preparation method thereof. Background technique [0002] The use of powder compaction and sintering technology can produce small and complex titanium alloy parts in large quantities, and there is a huge demand in many fields. However, powder injection molding of titanium alloys has been facing the dilemma that cost and performance cannot be achieved at the same time. If high-cost atomized titanium powder is used as a raw material, the product price will be too high and uncompetitive. However, low-cost hydrogenated dehydrogenated titanium powder (Hydride and Dehydrogenated Titanium Powders, HDH) is used as a raw material, and the oxygen content thereof is relatively high. Coupled with the addition of oxygen in the process of mixing, pressing, removing additives, sintering and other processes, the oxygen content in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C14/00B22F3/10B22F3/02B22F3/22B22F1/00
CPCC22C1/051C22C14/00B22F3/1007B22F3/1025B22F3/02B22F3/225B22F2999/00B22F1/103B22F1/10B22F2201/20
Inventor 何浩李益民许婷刘晨秦健春
Owner 长沙得悦科技发展有限公司
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