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Method for synthetizing nano Ag-Ni alloy

An alloy and nanotechnology, applied in the field of preparing nano-Ag-Ni alloys, can solve the problems affecting the homogenization of material microstructure, welding resistance, mechanical strength, electrical conductivity, low resistance, cracking, deformation, etc., to improve the withstand voltage. Strength and breakdown voltage, high mechanical strength, good welding resistance

Inactive Publication Date: 2009-04-08
SHENYANG NORMAL UNIV
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  • Application Information

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Problems solved by technology

[0002] Ag-Ni alloy is a typical contact material. It not only has good electrical conductivity, electrical corrosion resistance and low and stable resistance, but also has good plasticity and processability, but it also exposes poor welding resistance. and low mechanical strength
At present, it has been reported that dense metastable nanocrystalline Ag-Ni alloy has been prepared by mechanical alloying and hot pressing technology, but there are Ag networks in this alloy, the main reason is that the powder is continuously broken and deformed during the mechanical alloying process. , cold welding and short-range diffusion, the alloy has a supersaturated solid solubility, and after heat treatment, due to the high diffusion coefficient of the grain boundary, Ag will be precipitated in Ni and finally form a continuous Ag network, the appearance of the Ag network will affect Homogenization of material microstructure and welding resistance and mechanical strength of materials

Method used

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  • Method for synthetizing nano Ag-Ni alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1, a kind of method of synthesizing nanometer Ag-Ni alloy is realized by following steps: to [NiSO 4 ]=1.50mol / L and [AgNO 3 ]=1.50mol / L mixed solution, add ammoniacal liquor, adjust the pH value of solution=8.0, then add dispersant polyvinylpyrrolidone (PVP) 20mL, after heating to 70 ℃, add reducing agent [N 2 h 4 ·H 2 O]=2.50mol / L, the reduction reaction is carried out, after the completion of the reaction, filter and wash the powder with each 150mL of ethanol and acetone, and dry at normal temperature to obtain the synthetic nanoscale Ag-Ni alloy powder; the Ag-Ni alloy powder after the synthesis is Indeterminate flake shape, the average particle size measured by transmission electron microscope is 45nm. And then sintering the nanoscale Ag-Ni alloy powder at 620° C. and 20 MPa for 10 minutes to obtain a nanocrystalline Ag-Ni alloy with a density exceeding 99%.

Embodiment 2

[0014] Embodiment 2, a kind of method of synthesizing nanometer Ag-Ni alloy is realized by following steps: to [NiSO 4 ]=1.80mol / L and [AgNO 3 ]=2.50mol / L mixed solution, add ammoniacal liquor, adjust the pH value of solution=8.5, then add dispersant polyvinylpyrrolidone (PVP) 30mL, after heating to 80 ℃ again, add reducing agent [N 2 h 4 ·H 2 O]=3.00mol / L, the reduction reaction is carried out, after the completion of the reaction, filter and wash the powder with each 200mL of ethanol and acetone, dry at normal temperature to obtain the synthetic nanoscale Ag-Ni alloy powder; the Ag-Ni alloy powder after the synthesis is Indeterminate flake shape, the average particle size measured by transmission electron microscope is 45nm. And then sintering the nanoscale Ag-Ni alloy powder at 650° C. and 25 MPa for 15 minutes to obtain a nanocrystalline Ag-Ni alloy with a density exceeding 99%.

Embodiment 3

[0015] Embodiment 3, a kind of method of synthesizing nanometer Ag-Ni alloy is realized by following steps: to [NiSO 4 ]=0.7mol / L and [AgNO 3 ]=1.00mol / L mixed solution, add ammoniacal liquor, adjust the pH value of solution=7.5, then add dispersant polyvinylpyrrolidone (PVP) 15mL, after heating to 60 ℃ again, add reducing agent [N 2 h 4 ·H 2 O]=1.50mol / L, the reduction reaction is carried out, after the completion of the reaction, filter and wash the powder with each 100mL of ethanol and acetone, dry at normal temperature to obtain the synthetic nanoscale Ag-Ni alloy powder; the Ag-Ni alloy powder after the synthesis is Indeterminate flake shape, the average particle size measured by transmission electron microscope is 45nm. And then sintering the nanoscale Ag-Ni alloy powder at 600° C. and 15 MPa for 10 minutes to obtain a nanocrystalline Ag-Ni alloy with a density exceeding 99%.

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Abstract

The process of composing nanometer Ag-Ni alloy includes the following steps: adding ammonia water to the mixed solution of NiSO4 in 0.70-1.80 mol / L and AgNO3 in 1.00-2.50 mol / L to regulating pH value to 7.5-8.5, adding certain amount of polyvinyl pyrrolidone, heating to 60-80 deg.c, adding reductant N2H4.H2O in 1.50-3.00 mol / L to produce reaction reaction; filtering, washing the obtained powder with alcohol and acetone, drying at normal temperature to obtain nanometer level Ag-Ni alloy powder; sintering at 600-650 deg.c and 15-25 MPa for 10-15min to obtain high density crystallized Ag-Ni alloy. The process features the convenient operation, molecule level mixing of the reactant components and homogeneous micro alloy structure.

Description

Technical field: [0001] The invention relates to a method for preparing nanometer Ag-Ni alloy by liquid phase reduction technology, which belongs to the technical field of material chemistry application. Background technique: [0002] Ag-Ni alloy is a typical contact material. It not only has good electrical conductivity, electrical corrosion resistance and low and stable resistance, but also has good plasticity and processability, but it also exposes poor welding resistance. and low mechanical strength. At present, it has been reported that dense metastable nanocrystalline Ag-Ni alloy has been prepared by mechanical alloying and hot pressing technology, but there are Ag networks in this alloy, the main reason is that the powder is continuously broken and deformed during the mechanical alloying process. , cold welding and short-range diffusion, the alloy has a supersaturated solid solubility, and after heat treatment, due to the high diffusion coefficient of the grain bound...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04B22F9/24B22F3/10
Inventor 曹中秋祝溪明李凤春
Owner SHENYANG NORMAL UNIV
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