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Method for preparing nano-Cu uniformly coated Zn4Sb3 powder

A nano and powder technology, applied in the direction of coating, etc., can solve the problem of uniform distribution of nano second phase

Inactive Publication Date: 2010-06-09
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
  • Method for preparing nano-Cu uniformly coated Zn4Sb3 powder
  • Method for preparing nano-Cu uniformly coated Zn4Sb3 powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A kind of nano-Cu uniformly coated Zn 4 Sb 3 The preparation method of powder includes the following steps:

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

[0048] (1) The nominal composition is Zn 4.1 Sb 3 Calculation and synthesis of 60g single phase β-Zn 4 Sb 3 The compound requires high-purity metal Zn powder and high-purity metal Sb powder. The masses are 25.3992g and 34.6364g, respectively. The two raw materials are accurately weighed and mixed uniformly. After uniform mixing, they are sealed in a vacuum below 10 -1 In the MPa vacuum quartz tube, the purity of high-purity metal Zn powder is ≥99.999% (mass), and the purity of high-purity metal Sb powder is ≥99.99% (mass);

[0049] (2) The above-mentioned vacuum quartz tube is placed in a melting furnace, and the temperature is increased from room temperature to 1023K at a heating rate of 1K / min. The vacuum is melted for 2h, and the furnace is cooled to room temperature to obtain the required ...

Embodiment 2

[0063] A kind of nano-Cu uniformly coated Zn 4 Sb 3 The preparation method of powder includes the following steps:

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

[0065] 2) Zn uniformly coated by nano Cu 4 Sb 3 Preparation of powder:

[0066] (1) Weigh single phase β-Zn 4 Sb 3 10g powder, namely m 1 =10g, as single phase β-Zn 4 Sb 3 The ratio of the powder to the acidic surfactant with pH=5 is 10g:100ml. Weigh 100ml of the acidic surfactant to separate the single-phase β-Zn 4 Sb 3 The powder is added to the acidic surfactant with pH=5, and under the action of magnetic stirring, single-phase β-Zn 4 Sb 3 The powder is treated with an acidic surfactant for 10 minutes to obtain a suspension; then the molar concentration is 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 A suspension of powder; the acidic surfactant is an aqueous solution of nitric acid with pH=5; the acid-base ...

Embodiment 3

[0077] A kind of nano-Cu uniformly coated Zn 4 Sb 3 The preparation method of powder includes the following steps:

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

[0079] 2) Zn uniformly coated by nano Cu 4 Sb 3 Preparation of powder:

[0080] (1) Weigh single phase β-Zn 4 Sb 3 10g powder, as single-phase β-Zn 4 Sb 3 The ratio of the powder to the acidic surfactant with pH=5 is 10g:100ml. Weigh 100ml of the acidic surfactant to separate the single-phase β-Zn 4 Sb 3 The powder is added to the acidic surfactant with pH=5, and under the action of magnetic stirring, single-phase β-Zn 4 Sb 3 The powder is treated with an acidic surfactant for 15 minutes to obtain a suspension; then the molar concentration is 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 hydrochloric acid with pH=5; the acid-base regulator is a N...

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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, and specifically relates to a Zn uniformly coated with nano Cu 4 Sb 3 Preparation method of powder. 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 the lattice thermal conductivity κ L And carrier thermal conductivity κ C Sum (κ C =L 0 Tσ, L 0 Is Lorenz constant). Reducing κ, increasing α and σ are three ways to improve the thermal power figure of merit, but κ, σ, and α are generally strongly correlated. A decrease in κ must be accompanied by a decrease in σ. When α increases, σ generally decreases, and σ increases. Big time factor κ C Raise κ must increase. How to adjust κ, σ and α to achieve a large increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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