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Activated sintering preparation method for high-density titanium product

A technology of activated sintering and densification, which is applied in the field of powder metallurgy, can solve the problems of long sintering process, high production cost, excessive energy consumption, etc., and achieve fine grain size, high tensile strength, and adjustable powder particle size. Effect

Active Publication Date: 2019-09-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process has high requirements on equipment, long sintering process time, high production cost and excessive energy consumption

Method used

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  • Activated sintering preparation method for high-density titanium product
  • Activated sintering preparation method for high-density titanium product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. The raw material powder is commercially available hydrogenated dehydrogenation titanium powder with a median diameter of 32.2 μm. Weigh 1000g, place the titanium powder in the grinding chamber of a fluidized bed jet mill, fill it with high-purity nitrogen as a protective gas and grind Gas, the air pressure is 0.7MPa, after 8 minutes of treatment, a high-activity titanium powder with a large specific surface area is obtained;

[0025] 2. Then collect the highly active titanium powder by airflow classification, adjust the frequency of the sorting wheel to 50Hz, and obtain titanium powder with a median diameter of 20 μm after treatment;

[0026] 3. The oxygen content of the titanium powder obtained above is lower than 2000ppm, and the bulk density is 2.51g / cm 3 ;

[0027] 4. Molding the titanium powder obtained above under a pressure of 10 MPa to obtain a green body;

[0028] 5. Place the above-mentioned green body in a high-vacuum molybdenum wire furnace for sinterin...

Embodiment 2

[0031] 1. The raw material powder is commercially available hydrogenated dehydrogenation titanium powder, with a median diameter of 32.2 μm, weighed 800g, placed the titanium powder in the grinding chamber of a fluidized bed jet mill, filled with high-purity argon as a protective gas and Grinding gas, the air pressure is 0.8MPa, after processing for 10min, the highly active titanium powder is collected by airflow classification, and the frequency of the sorting wheel is adjusted to 40Hz to obtain titanium powder with a median diameter of 22.5μm;

[0032] 2. The oxygen content of the titanium powder obtained above is lower than 2000ppm, and the bulk density is 2.43g / cm 3 ;

[0033] 3. The titanium powder obtained above is molded under a pressure of 11.3MPa to obtain a green body;

[0034] 4. Place the above green body in a high vacuum molybdenum wire furnace for sintering. The final sintering temperature is 1150°C, the heating rate is 10°C / min, the holding time is 2h, and the ...

Embodiment 3

[0037] 1. The raw material powder is commercially available titanium powder with a median diameter of 42 μm. Weigh 600g, place the titanium powder in the grinding chamber of a fluidized bed jet mill, and fill it with high-purity nitrogen as protective gas and grinding gas. The air pressure is 0.7MPa, collect highly active titanium powder through airflow classification, adjust the frequency of the sorting wheel to 35Hz, and obtain titanium powder with a median diameter of 30.4μm;

[0038] 2. The oxygen content of the titanium powder obtained above is lower than 1900ppm, and the bulk density is 2.45g / cm 3 ;

[0039] 3. The titanium powder obtained above is molded under a pressure of 11.5MPa to obtain a green body;

[0040] 4. Place the above green body in a high vacuum tungsten wire furnace for sintering. The final sintering temperature is 1150°C, the heating rate is 20°C / min, the holding time is 1h, and the relative density is 98.1%. The tensile strength is 685MPa, and the el...

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Abstract

The invention provides an activated sintering preparation method for a high-density titanium product and belongs to the technical field of powder metallurgy. The activated sintering preparation method comprises the following steps: firstly, carrying out modifying treatment on titanium powder by adopting a fluidized bed jet mill; secondly, adjusting the frequency of a sorting wheel by a fluidizing process to obtain high-activity titanium powder with different particle size ranges; carrying out die forming on the obtained titanium powder with different particle sizes; carrying out high vacuum sintering by adopting a vacuum tungsten coil furnace or high vacuum molybdenum wire furnace to obtain a high-density titanium sintered product. The high-density titanium powder with narrow particle size distribution, adjustable powder particle size, large specific area and low oxygen content can be obtained by a fluidization-airflow classification technique; compared with a titanium part which is not subjected to powder modifying treatment and is obtained by molded sintering, a titanium powder sintered part subjected to activating treatment has the characteristics of small dimensional shrinkage, high density, high tensile strength, better plasticity, well-closed formation, fine grains and the like; the titanium powder subjected to activating treatment can reach higher density in the sintering process at higher sintering rate within short soaking time.

Description

technical field [0001] The invention relates to an activation sintering method for high-density pure titanium products, in particular to the preparation of titanium powder with narrow particle size, large specific surface area, low oxygen content and high activity through fluidization-airflow classification technology. The powder can be used in a short time The activation and sintering of titanium products can be realized within a short period of time to achieve the purpose of rapid densification. The invention belongs to the technical field of powder metallurgy, and relates to an activation sintering preparation method of high-density titanium products. Background technique [0002] Metal titanium has the advantages of low density, excellent corrosion resistance, high specific strength, and excellent biocompatibility, and is widely used in high-tech fields such as aerospace, biomedical, petrochemical, and energy power. Due to the high activity of titanium, it is easily oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02B22F9/04B22F3/10B22F1/00
CPCB22F3/02B22F9/04B22F3/10B22F1/14
Inventor 陈刚秦明礼陶麒鹦曲选辉
Owner UNIV OF SCI & TECH BEIJING
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