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Method for preparing nano-Cu uniformly coated Zn4Sb3 powder

A nano and powder technology, applied in liquid chemical plating, coating, metal material coating process and other directions, can solve the problem of uniform distribution of nano second phase

Inactive Publication Date: 2008-10-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to uniformly distribute the nanometer second phase in bulk thermoelectric materials is an unsolved problem.

Method used

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  • Method for preparing nano-Cu uniformly coated Zn4Sb3 powder
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  • Method for preparing nano-Cu uniformly coated Zn4Sb3 powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A Zn uniformly coated with nano-Cu 4 Sb 3 The preparation method of powder, it comprises the steps:

[0047] 1) Preparation of single-phase β-Zn by melting method 4 Sb 3 Powder:

[0048] (1) According to the nominal composition, it is Zn 4.1 Sb 3 Calculation and synthesis of 60g single-phase β-Zn 4 Sb 3 Compounds require high-purity metal Zn powder and high-purity metal Sb powder to be 25.3992g and 34.6364g respectively. Weigh the two raw materials accurately and mix them evenly. -1 In the vacuum quartz tube of MPa, the purity of the high-purity metal Zn powder is more than or equal to 99.999% (mass), and the purity of the high-purity metal Sb powder is more than or equal to 99.99% (mass);

[0049] (2) The above-mentioned vacuum quartz tube is placed in a melting furnace, raised from room temperature to 1023K at a heating rate of 1K / min, melted in vacuum for 2 hours, and cooled to room temperature with the furnace to obtain the required single-phase β-Zn 4 Sb ...

Embodiment 2

[0063] A Zn uniformly coated with nano-Cu 4 Sb 3 The preparation method of powder, it comprises the steps:

[0064] 1) Preparation of single-phase β-Zn by melting method 4 Sb 3 Powder: with embodiment 1.

[0065] 2) Nano-Cu uniformly coated Zn 4 Sb 3 Powder preparation:

[0066] (1) Weigh single-phase β-Zn 4 Sb 3 Powder 10g, ie m 1 =10g, according to single-phase β-Zn 4 Sb 3 The ratio of the powder to the acidic surfactant of pH=5 is 10g: 100ml, and 100ml of the acidic surfactant is weighed, and the single-phase β-Zn 4 Sb 3 The powder is added to the acidic surfactant with pH=5, under the action of magnetic stirring, the single-phase β-Zn 4 Sb 3 The powder was treated with an acidic surfactant for 10 minutes to obtain a suspension; then the molar concentration was 1×10 -3 mol / L acid-base regulator adjusts the pH value of the suspension to 8 to obtain activated β-Zn 4 Sb 3 powder suspension; the acidic surfactant is an aqueous solution of nitric acid, its pH=5;...

Embodiment 3

[0077] A Zn uniformly coated with nano-Cu 4 Sb 3 The preparation method of powder, it comprises the steps:

[0078] 1) Preparation of single-phase β-Zn by melting method 4 Sb 3 Powder: with embodiment 1.

[0079] 2) Nano-Cu uniformly coated Zn 4 Sb 3 Powder preparation:

[0080] (1) Weigh single-phase β-Zn 4 Sb 3 Powder 10g, according to single phase β-Zn 4 Sb 3 The ratio of the powder to the acidic surfactant of pH=5 is 10g: 100ml, and 100ml of the acidic surfactant is weighed, and the single-phase β-Zn 4 Sb 3 The powder is added to the acidic surfactant with pH=5, under the action of magnetic stirring, the single-phase β-Zn 4 Sb 3 The powder was treated with an acidic surfactant for 15 minutes to obtain a suspension; then the molar concentration was 1×10 -3 mol / L acid-base regulator adjusts the pH value of the suspension to 8 to obtain activated β-Zn 4 Sb 3 powder suspension; the acidic surface active agent is an aqueous solution of hydrochloric acid, its pH=...

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Abstract

The invention relates to a preparation method of Zn4Sb3 powder that is evenly coated with nano Cu. The method is characterized in that: the mixture of highly pure metal Zn powder and Sb powder is firstly smelted under vacuum, condensed and crystallized to obtain the casting body of a single-phase beta-Zn4Sb3 compound, the casting body is ground and sieved to obtain beta-Zn4Sb3 powder, to which surface processing is carried out; then an acid and alkali regulator is used for regulating pH value to obtain activating beta-Zn4Sb3 powder; then the activating beta-Zn4Sb3 powder is used as a parent stock and water soluble cupric salt is used as a Cu source to form the Zn4Sb3 powder that is evenly coated with the nano Cu by liquid phase reduction reaction, electroless plating process and organic protection treatment. The preparation method is characterized by low cost, simple operation, even coating of the nano Cu and environmental protection, etc. The powder not only can keep the thermoelectric transmission properties of the beta-Zn4Sb3 compound, but also has improved phonon scattering effect and electron energy filtering effect electron energy for being evenly coated by nano second phase.

Description

technical field [0001] The invention belongs to the technical field of new energy thermoelectric conversion materials, in particular to a Zn nano-Cu uniform coating 4 Sb 3 Powder preparation method. Background technique [0002] The thermoelectric conversion efficiency of thermoelectric materials depends on the dimensionless thermoelectric figure of merit ZT = α 2 σT / κ, T is the absolute temperature, α is the Seebeck coefficient, σ is the electrical conductivity, κ is the thermal conductivity, and κ is equal to the lattice thermal conductivity κ L and carrier thermal conductivity κ C sum (κ C =L 0 Tσ, L 0 is the Lorenz constant). Reducing κ, increasing α and σ are three ways to improve the thermoelectric figure of merit, but κ, σ and α are generally strongly correlated, and the decrease of κ must be accompanied by the decrease of σ. When α increases, σ generally decreases correspondingly, and σ increases large time factor κ C Elevated κ must increase. How to adjust...

Claims

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Application Information

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IPC IPC(8): B22F1/02C23C18/40
Inventor 赵文俞王要娟魏平唐新峰张清杰
Owner WUHAN UNIV OF TECH
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