Powder metallurgy method for preparing high-density titanium and titanium alloy

A powder metallurgy and titanium alloy technology, which is applied in the field of powder metallurgy to prepare titanium and titanium alloy products, can solve the problems of poor mechanical properties of titanium and titanium alloy products, poor machining performance of titanium, increased production costs, etc., and achieve shortening pressure Process, reduce processing cost, increase surface activity effect

Active Publication Date: 2014-10-08
KUNMING METALLURGY INST
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  • Application Information

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Problems solved by technology

[0002] Metal titanium and its alloys have the advantages of low density, high specific strength, good corrosion resistance, high heat resistance, non-magnetic, good welding performance, etc., and are widely used in aerospace, automotive, chemical, electric power, watches, medical and other fields. However, due to the long process route of the conventional melting and casting method, the low utilization rate of materials, the poor machining performance of titanium, and the high preparation cost, the application of titanium and titanium alloys is limited.
Powder metallurgy has become a suitable and feasible new process for the production of titanium and titanium alloys. The traditional powder metallurgy method uses titanium powder and alloy metal powder as raw materials, and the density of titanium and titanium alloys prepared by vacuum sintering or inert atmosphere protection is only It can reach about 95%, resulting in poor mechanical properties of the prepared titanium and titanium alloy products. Generally, subsequent hot isostatic pressing treatment is required to improve the sintered density of the material, thereby improving the material performance and increasing the production cost.

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  • Powder metallurgy method for preparing high-density titanium and titanium alloy

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Experimental program
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Effect test

Embodiment 1

[0025] Put the 48μm titanium powder into the mold, and press it into the designed product shape under the pressure of 300MPa by cold isostatic pressing; put the compact into the sintering furnace for charging; close the furnace door, and evacuate the furnace to a vacuum degree less than 10 -3 Pa, introduce argon gas, then vacuumize, and repeat the operation 3 times to purify the atmosphere in the furnace; feed a mixed gas of high-purity hydrogen and high-purity argon with a purity of more than 99.999%, and the content of hydrogen in the mixed gas is 20% by volume , while raising the temperature to 400°C at a heating rate of 5°C / min, and keeping it warm for 3 hours. During the sintering process, keep the furnace pressure at 1.1×10 5 ~1.2×10 5 Pa; after the heat preservation is over, the gas is turned off, the vacuum system is turned on, and at the same time, the temperature is raised to 1200°C at a heating rate of 5°C / min, the heat preservation time is 4 hours, and then coole...

Embodiment 2

[0027] Put the 48μm titanium powder into the mold, and press it into the designed product shape under the pressure of 300MPa by cold isostatic pressing; put the compact into the sintering furnace for charging; close the furnace door, and evacuate the furnace to a vacuum degree less than 10 -3 Pa, introduce argon gas, then vacuumize, and repeat the operation 3 times to purify the atmosphere in the furnace; feed a mixed gas of high-purity hydrogen and high-purity argon with a purity of more than 99.999%, and the content of hydrogen in the mixed gas is 20% by volume , while raising the temperature to 600°C at a heating rate of 5°C / min, and keeping the temperature for 1 hour. During the sintering process, keep the furnace pressure at 1.1×10 5 ~1.2×10 5 Pa; after the heat preservation is over, the gas is turned off, the vacuum system is turned on, and at the same time, the temperature is raised to 1200°C at a heating rate of 5°C / min, the heat preservation time is 4 hours, and the...

Embodiment 3

[0029] Put the 48μm titanium powder into the mold, and press it into the designed product shape under the pressure of 300MPa by cold isostatic pressing; put the compact into the sintering furnace for charging; close the furnace door, and evacuate the furnace to a vacuum degree less than 10 -3 Pa, feed argon, then vacuumize, repeat the operation 3 times to purify the atmosphere in the furnace; feed a mixed gas of high-purity hydrogen and high-purity argon with a purity of more than 99.999%, and the content of hydrogen in the mixed gas is 15% by volume , while raising the temperature to 600°C at a heating rate of 5°C / min and keeping it warm for 2 hours. During the sintering process, keep the furnace pressure at 1.1×10 5 ~1.2×10 5 Pa; after the heat preservation is over, the gas is turned off, the vacuum system is turned on, and at the same time, the temperature is raised to 1200°C at a heating rate of 5°C / min, the heat preservation time is 4 hours, and then cooled to room temp...

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Abstract

The invention discloses a powder metallurgy method for preparing high-density titanium and titanium alloy products. The method comprises the following steps: preparing raw materials and mixing; performing pressure forming; performing atmosphere purifying; performing atmosphere-vacuum sintering. According to the method, titanium powder or titanium alloy mixed powder is adopted as the raw material and is subjected to pressure forming and atmosphere-vacuum sintering in sequence; the atmosphere sintering is adopted at the temperature of 400-600 DEG C, mixed gas of hydrogen and argon is introduced, and heat is preserved for 2-3 hours, thus generating TiHx (x is more than 0 and not more than 2); the vacuum sintering is adopted at the temperature of 600-1350 DEG C, and heat is preserved at 1200-1350 DEG C for 4-6 hours; by virtue of the diffusion analysis effect and the interstitial solid solution of hydrogen, the vacancy concentration and dislocation in titanium are increased, the surface activity of titanium is improved, and the sintering free energy effect is reduced, thus obtaining dense titanium and titanium alloy. The titanium/ titanium alloy products prepared by adopting the method are high in density, the process route is short, a subsequent pressure processing process can be reduced or shortened, and the processing cost is lowered. The problems of high cost and low density of a conventional powder metallurgy method for preparing titanium and titanium alloy are solved.

Description

technical field [0001] The invention belongs to the technical field of processing titanium and titanium alloy products, and in particular relates to a method for preparing titanium and titanium alloy products by adopting a powder metallurgy process. Background technique [0002] Metal titanium and its alloys have the advantages of low density, high specific strength, good corrosion resistance, high heat resistance, non-magnetic, good welding performance, etc., and are widely used in aerospace, automotive, chemical, electric power, watches, medical and other fields. However, the application of titanium and titanium alloys is limited due to the long process route of the conventional smelting and casting method, low utilization rate of materials, poor machining performance of titanium, and high preparation cost. Powder metallurgy has become a suitable and feasible new process for the production of titanium and titanium alloys. The traditional powder metallurgy method uses titan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C14/00C22B34/12
Inventor 尚青亮杨钢刘捷方树铭张玮孙彦华赖非
Owner KUNMING METALLURGY INST
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