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Preparation method of nano-porous palladium-based amorphous alloy

An amorphous alloy and nanoporous technology, which is applied in the field of preparation of amorphous/crystalline composite nanoporous materials, can solve the problems such as the inability to maintain the essential characteristics of amorphous, and achieve the effect of simple operation and reliable results.

Active Publication Date: 2019-04-26
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the method of preparing porous metallic glasses, the reported dealloying is commonly used as an effective means, however, due to the disappearance of some constituent elements in the process of dealloying, multicomponent metallic glasses with single-phase structure and uniform composition cannot maintain its non-crystalline essential characteristics

Method used

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  • Preparation method of nano-porous palladium-based amorphous alloy
  • Preparation method of nano-porous palladium-based amorphous alloy
  • Preparation method of nano-porous palladium-based amorphous alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The schematic diagram of the preparation process of the present invention is as figure 1 shown.

[0032] 1) Select x=2.5 to prepare Pd 41.25 Ni 41.25 P 17.5 . Weigh 0.26253g of P and 0.99502g of Ni, both of which are sintered to form Ni 2 P ingot.

[0033] 2) Subsequent addition of 2.12627g of Pd and 0.17728g of Ni to Ni 2 In the P ingot, under the radio frequency induction heating, the elements are uniformly mixed to obtain Pd 41.25 Ni 41.25 P 17.5 alloy ingot.

[0034] 3) Take an appropriate amount of B 2 o 3 Put it into a cleaned quartz glass tube and dehydrate it at 923K for two hours.

[0035] 4) In a low vacuum environment at 1473K (10 -2 Torr) were treated by melt coating method, and the time was maintained at 90min.

[0036] 5) Take out the Pd 41.25 Ni 41.25 P 17.5 The quartz tube of the alloy sample is cooled in the air for 120s, placed in a 623K gold heating furnace, and kept at this temperature for 75min. After heat preservation, take out th...

Embodiment 2

[0043] 1) Choose x=3, prepare Pd 41.5 Ni 41.5 P 17 . Weigh 0.26253g of P and 0.99502g of Ni, both of which are sintered to form Ni 2 P ingot.

[0044] 2) Then add 2.19970g of Pd and 0.21850g of Ni to Ni 2 In the P ingot, under the radio frequency induction heating, the elements are uniformly mixed to obtain Pd 41.5 Ni 41.5 P 17 alloy ingot.

[0045] Same as 3) and 4) of the implementation example.

[0046] 5) Take out the Pd 41.5 Ni 41.5 P 17 The quartz tube of the alloy sample is cooled in the air for 120s, placed in a 613K gold heating furnace, and kept at this temperature for 60min. After heat preservation, take out the quartz tube containing the sample, put it in water and quench it to room temperature, take out the sample for cleaning, and slice it for later use.

[0047] The following steps are the same as step 6) to step 10) in implementation example 1.

Embodiment 3

[0049] 1) Select x=3.5 to prepare Pd 41.75 Ni 41.75 P 16.5 . Weigh 0.26253g of P and 0.99502g of Ni, both of which are sintered to form Ni 2 P ingot.

[0050] 2) Subsequent addition of 2.28058g of Pd and 0.26280g of Ni to Ni 2 In the P ingot, under the radio frequency induction heating, the elements are uniformly mixed to obtain Pd 41.75 Ni 41.75 P 16.5 alloy ingot.

[0051] The steps are the same as 3) and 4) in the implementation example 1.

[0052] 5) Take out the Pd 41.75 Ni 41.75 P 16.5 The quartz tube of the alloy sample is cooled in the air for 150s, placed in a 593K gold heating furnace, and kept at this temperature for 30min.

[0053] The next steps are the same as step 6) to step 10) in implementation example 1.

[0054] Microindentation tests showed that nanoporous Pd (40+x / 2) Ni (40+x / 2) P (20-x) It has the ability of local anti-injury. Scanning electron microscope image of indentation test Figure 5 shown. Figure 5 b and c represent the enlarge...

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Abstract

The invention discloses a preparation method of a nano-porous palladium-based amorphous alloy, the atomic expression of the amorphous alloy is Pd (40 + x / 2) Ni (40 + x / 2) P (20-x), the x ranges from 2.5 to 3.5; a Pd-Ni-P amorphous / crystalline composite material is firstly prepared through a phase change and partial crystallization method; a selective corrosion method combining acid solution soaking with drying is repeatedly used to remove a part of a crystalline phase, so that the porous amorphous alloy with nano-scale distribution is obtained. The full amorphous structure of the nano-porous Pd-Ni-P metal glass is verified by testing means of a scanning electron microscope, a transmission electron microscope and a selective electron diffraction pattern and is shown by an image of a scanning electron microscope, and nanopores are distributed in the metal glass, wherein the size range of the nanopores is 40-100 nm, and the nanopores are connected in a penetrating mode.

Description

technical field [0001] The invention belongs to the field of amorphous alloys, and specifically relates to a preparation method for obtaining amorphous / crystalline composite nanoporous materials by heat preservation and annealing in a cold zone for different times. Background technique [0002] In recent years, nanoporous materials have attracted great interest for applications in catalysis, sensors, actuators, supercapacitors, and mechanics. Nanoporous metallic glasses (Metallic glasses, MGs) are a new member of the nanoporous metal family. Because the cracks only extend to the local area affected by mechanics, this kind of material has the ability to resist damage. On the other hand, due to the excellent electrocatalytic function of Pd-based alloys reported by a large number of literatures, nanoporous alloys can provide a larger specific surface area, which greatly improves the catalytic efficiency. [0003] In the method of preparing porous metallic glasses, the reported...

Claims

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Application Information

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IPC IPC(8): C22C45/00C22F1/14
CPCC22C45/003C22F1/14C22C1/11
Inventor 兰司董蔚霞
Owner NANJING UNIV OF SCI & TECH
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