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Sintering method of high-strength and high-plasticity powder titanium alloy

A sintering method and titanium alloy technology, applied in the fields of injection molding and powder metallurgy, can solve the effective regulation of the structure and properties of difficult titanium and titanium alloy parts, the price of high-quality titanium alloy powder remains high, and the performance and cost cannot be balanced. and other problems, to achieve the effect of fine grains, good plasticity and low oxygen content

Pending Publication Date: 2022-07-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in addition to limited applications in high-end fields, titanium alloy products have not yet achieved large-scale industrialization. The main reasons are: (1) the mechanical properties of the parts are not enough; (2) the cost is high
At present, high-quality titanium alloy powder is mainly produced by atomization technology, and due to technical limitations, the price of high-quality titanium alloy powder remains high
Processes such as hydrodehydrogenation can prepare low-cost titanium alloy powders in batches, but due to their low quality, the mechanical properties of the parts are not good
In addition, the existing near net shape process is difficult to achieve effective control of the microstructure and properties of titanium and titanium alloy parts, and cannot balance its performance and cost

Method used

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  • Sintering method of high-strength and high-plasticity powder titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. The raw material powder is a commercially available gas-atomized TC4 powder with a median diameter of 12.7 μm. Weigh 1000 g of the alloy powder and the wax-based binder into an internal mixer according to a volume ratio of 65:35. Mixing and granulating at a speed of 30r / min for 90min to obtain injection molding feed;

[0031] 2. Use an injection molding machine to inject the above feed into the mold to make a stretch rod blank;

[0032] 3. Immerse the stretch rod blank in hexane at a temperature of 50°C and a immersion time of 1440min;

[0033] 4. Put the stretched rod after solvent degreasing into a high vacuum molybdenum wire furnace, and after thermal degreasing, the temperature is raised to 1050 °C at a heating rate of 2 °C / min and vacuum sintered for 120 min to obtain a TC4 titanium alloy stretched rod;

[0034] 5. The mechanical properties of the produced TC4 titanium alloy tensile rod are tested, and the results show that the density is 97.1%, the tensile str...

Embodiment 2

[0036] 1. The raw material powder is a commercially available hydrodehydrogenation TC4 powder with a median diameter of 20.1 μm. Weigh 1000 g of the powder, place the powder in the grinding chamber of the jet mill, fill it with high-purity argon as the protective gas and grind the gas, and the air pressure is 0.8MPa, after 10min treatment, the treated titanium alloy powder was collected.

[0037] 2. Load the treated alloy powder and the wax-based binder into an internal mixer according to a volume ratio of 65:35, mix at a speed of 30r / min at 160°C for 90min and granulate to obtain an injection molding feed;

[0038] 3. Use an injection molding machine to inject the above feed into the mold to make a stretch rod blank;

[0039] 4. Immerse the stretch rod blank in trichloroethylene at a temperature of 40°C and a soaking time of 720min;

[0040] 5. Put the stretched rod after solvent degreasing into a high vacuum molybdenum wire furnace, and after thermal degreasing, the tempera...

Embodiment 3

[0043] 1. The raw material powder is a commercially available gas-atomized TC4 powder with a median diameter of 20.1 μm. Weigh 1000 g of the alloy powder and the wax-based binder into an internal mixer at a volume ratio of 65:35. Mixing and granulating at a speed of 30r / min for 90min to obtain injection molding feed;

[0044] 2. Use an injection molding machine to inject the above feed into the mold to make a stretch rod blank;

[0045] 3. Immerse the stretch rod blank in hexane at a temperature of 70°C for 12 hours;

[0046] 4. Put the stretch rod after solvent degreasing into a high vacuum tungsten wire furnace, and after thermal degreasing, the temperature is raised to 1050 °C at a heating rate of 2 °C / min and vacuum sintered for 120 min to obtain a TC4 titanium alloy stretched rod;

[0047] 5. The mechanical properties of the produced TC4 titanium alloy tensile rod were tested, and the results showed that the density was 99.6%, the tensile strength was 1079MPa, the yield ...

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Abstract

The invention provides a sintering preparation method of a high-strength and high-plasticity powder titanium alloy, and particularly relates to the field of injection molding. The method comprises the following steps: weighing a certain amount of commercially available hydrogenated and dehydrogenated TC4 titanium alloy powder, and carrying out powder activation modification treatment on the powder by adopting an airflow mill; the treated titanium alloy powder and a binder are subjected to mulling and granulation, and feed is obtained; the feed is subjected to injection molding, and a blank is obtained; the obtained blank is subjected to solvent degreasing and thermal degreasing; and finally, a high-vacuum tungsten wire furnace or a high-vacuum molybdenum wire furnace is adopted for high-vacuum sintering at the highest temperature of 950-1050 DEG C for 10-360 min, furnace cooling is carried out, and a titanium alloy sintered product with the tensile strength larger than 950 MPa and the ductility larger than 15% is obtained. By adopting the method, a high-strength and high-plasticity titanium alloy sintered product can be prepared by sintering under a relatively low-temperature condition.

Description

technical field [0001] The invention relates to a sintering preparation method of high-strength and high-plasticity powder titanium alloy, in particular to the field of injection molding. By adopting the method, high-strength and high-plasticity titanium alloy sintered products can be obtained by sintering under relatively low temperature conditions. The invention belongs to the technical field of powder metallurgy, and relates to a sintering preparation method of high-strength and high-plastic powder titanium alloy. [0002] technical background [0003] Titanium and titanium alloys have broad application prospects in aerospace, biomedical, energy and chemical fields due to their light weight, high strength, resistance to corrosion, and good biocompatibility. However, due to the poor processing performance of titanium alloys, traditional processing technologies such as smelting casting and extrusion forging are difficult to achieve stable production of titanium materials wit...

Claims

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Application Information

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IPC IPC(8): B22F3/10B22F3/22B22F9/04
CPCB22F9/04B22F3/225B22F3/1025B22F3/1007B22F2009/044
Inventor 陈刚秦明礼曲选辉田汉清辛富生魏敬浩
Owner UNIV OF SCI & TECH BEIJING
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