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ti-22al-25nb/al 2 o 3 Preparation method of composite material

A technology of ti-22al-25nb and composite materials, which is applied in the field of composite material preparation, can solve the problems of large alloy grain size, long densification time, and elements not alloyed, and achieve the effect of small size

Active Publication Date: 2019-11-05
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the Ti-22Al-25Nb(at.%) alloy is prepared from the pre-alloyed powder by hot pressing and sintering, it takes a long time for densification (generally not less than 1h); after the element powder is mixed with low-energy powder, there is no alloying between the elements. , resulting in a longer sintering time (generally not less than 1.5h) during spark plasma sintering, resulting in a larger grain size of the above alloy

Method used

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  • ti-22al-25nb/al <sub>2</sub> o <sub>3</sub> Preparation method of composite material
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  • ti-22al-25nb/al <sub>2</sub> o <sub>3</sub> Preparation method of composite material

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preparation example Construction

[0030] Such as figure 1 As shown, a Ti-22Al-25Nb / Al 2 O 3 The preparation method of the composite material adopts the mechanical alloying method to prepare Ti-22Al-25Nb / Al 2 O 3 Alloyed powder, and then Ti-22Al-25Nb / Al 2 O 3 The composite material powder is sintered into a block material. It includes the following steps:

[0031] S1. Weigh Ti powder, Al powder, Nb powder and Al at a mass ratio of 25:6:23:2.84 2 O 3 The powder is added to the ball milling tank, and the stainless steel grinding balls are added at a ball-to-battery ratio of 6:1 to 12:1. The ball milling tank is evacuated and filled with argon. Repeat more than 3 times;

[0032] S2. Put the ball milling tank on the ball mill and conduct mechanized alloying at a speed of 380r / min~450r / min. After each ball milling for a period of time, stop and rest for a period of time. The total alloying time is 60~80h;

[0033] S3. After the mechanized alloying is completed, the ball milling tank is opened and passivated in an argon glo...

Embodiment 1

[0036] S1. Weigh 25gTi powder, 6gAl powder, 23gNb powder and 2.84g Al 2 O 3 For the powder, add 454g stainless steel grinding balls at a ratio of 8:1, and add the above powder to the ball milling tank, and repeat 4 times of vacuum and argon filling;

[0037] S2. The ball milling tank is placed on the planetary ball mill for mechanical alloying at a speed of 430r / min for 60 hours. During the alloying period, the ball mill will be stopped for 20 minutes for 0.5 hours;

[0038] S3. Move the ball milling tank to a glove box filled with argon gas, open it and passivate it for 72 hours to obtain alloyed Ti-22Al-25Nb / Al 2 O 3 Composite powder

[0039] S4. Take 27g of the above powder in the glove box and move to Move the graphite mold to the spark plasma sintering equipment, pump the vacuum in the cavity to 4Pa, slowly increase the pressure to 80MPa, continue to pressurize, pour in argon gas to make the pressure in the cavity reach 5×10 4 Pa. Raise the temperature to 1200°C at a heating rat...

Embodiment 2

[0041] S1. Convert the atomic ratio in Ti-22Al-25Nb (at.%) into mass ratio, weigh 25g of Ti powder, 6g of Al powder, 23g of Nb powder, and weigh 2.84g of Al 2 O 3 Powder; add 511g stainless steel grinding balls with a ball-to-battery ratio of 9:1; add the above materials into the ball milling tank, then vacuum and fill with argon gas repeatedly for 4 times;

[0042] S2. Put the ball milling jar on the planetary ball mill at a speed of 390r / min for mechanical alloying for 70 hours. During the high-energy ball milling, stop and rest for 20 minutes every 1 hour of ball milling;

[0043] S3. Move the ball milling tank to a glove box filled with argon gas, open it and passivate it for 72 hours to obtain alloyed Ti-22Al-25Nb / Al 2 O 3 Composite powder

[0044] S4. Determine the height of the block composite material after sintering to be about 5mm, select In the graphite mold, weigh 27g of alloyed composite powder into the graphite mold, move it to the spark plasma sintering equipment, pump...

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Abstract

The invention belongs to the field of composite material preparation, and particularly relates to a preparation method of a Ti-22Al-25Nb / Al2O3 composite material. The atomic ratio of Ti powder to Al powder to Nb powder is 53:22:25, and the weight of Al2O3 powder is 5% of the total weight of the Ti powder, Al powder and Nb powder. The preparation method comprises the following steps that S1, the appropriate amount of Ti power, Al powder, Nb powder and Al2O3 powder with the mass ratio being 25:6:23:2.84 is weighed and added into a ball mill tank, stainless steel grinding balls are added in the preset ball material ratio, and the ball mill tank is vacuumized and filled with argon; S2, the ball mill tank is placed on a ball mill, mechanical alloying is conducted at the speed of 380 r / min-450 r / min, shutting-down for rest is conducted after each certain time of ball milling, and the total mechanical alloying time is 60-80 hours; S3, after mechanical alloying is completed, the ball mill tankis opened in a glove box filled with the argon for passivation, the passivation time is not less than 72 hours, and alloyed Ti-22Al-25Nb / Al2O3 composite powder is obtained; and S4, the composite powder is loaded into a graphite mould and moved into a discharge plasma sintering machine to be sintered, and the Ti-22Al-25Nb / Al2O3 blocky composite material with fine grains is obtained.

Description

Technical field [0001] The invention belongs to the field of composite material preparation, and particularly relates to a Ti-22Al-25Nb / Al 2 O 3 Preparation method of composite material. Background technique [0002] Ti 2 AlNb-based alloy is a new type of titanium alloy material, especially Ti-22Al-25Nb(at.%) alloy has excellent specific strength, oxidation resistance and creep resistance and other comprehensive properties, and is widely used in the aerospace field . Ti-22Al-25Nb(at.%) alloy consists of B2 phase, O phase and α 2 The phase composition, at room temperature, its plasticity and workability are very poor, which largely limits the application of the alloy in a wider range. Melting casting is a traditional process for preparing Ti-22Al-25Nb alloy. The defects of the casting structure and the unevenness of the composition seriously affect the mechanical properties of the alloy. Powder metallurgy technology can not only avoid structure segregation and obtain a uniform s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C32/00C22C1/05
CPCC22C1/05C22C14/00C22C32/0031
Inventor 贾建波刘文超徐岩刘海亮鹿超
Owner YANSHAN UNIV