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Method for preparing block beta-FeSi2 thermoelectric and photoelectric conversion material

A photoelectric conversion material and block technology, applied in the direction of thermoelectric device lead-out wire materials, etc., can solve the problems of surface cracks in finished products, complicated preparation process, and limited shape and size of products, so as to shorten heat treatment time and process flow Short, easy-to-manipulate effects

Active Publication Date: 2013-09-25
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is that the existing β-FeSi 2 The preparation process of thermoelectric and photoelectric conversion materials is complicated; the melting and casting method prepares β-FeSi 2 Material, there are problems that the shape and size of the product are limited, and the finished product is prone to surface cracks

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  • Method for preparing block beta-FeSi2 thermoelectric and photoelectric conversion material
  • Method for preparing block beta-FeSi2 thermoelectric and photoelectric conversion material
  • Method for preparing block beta-FeSi2 thermoelectric and photoelectric conversion material

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Embodiment 1

[0029] A preparation of bulk β-FeSi 2 A method for thermoelectric and photoelectric conversion materials, comprising the following preparation steps:

[0030] (1) Raw material ratio and heating method: The massive high-purity Fe and Si are mixed according to the mass percentage ratio of 1:1.04, and the quartz crucible with an inner diameter of φ20mm is used for high-frequency induction heating and melting. During the heating and melting process, the High-purity argon protection;

[0031] (2) Melt superheating treatment: After heating the raw material to 1250°C to melt, heat up to 1550°C for overheating treatment, and then quickly reduce the power of the induction heating power supply to cool the melt to the solidification temperature at a cooling rate of 30°C / s. Then re-heat to 1550°C and then cool down. One overheating and one cooling is called a cycle, and a total of 3 cycles are carried out;

[0032] (3) Cooling speed control after solidification: After solidification, un...

Embodiment 2

[0035] A preparation of bulk β-FeSi 2 A method for thermoelectric and photoelectric conversion materials, comprising the following preparation steps:

[0036] (1) Raw material ratio and heating method: The massive high-purity Fe and Si are mixed according to the ratio of mass percentage 1:1.04, and a quartz crucible with an inner diameter of φ8mm is used for high-frequency induction heating and melting. High-purity argon protection;

[0037] (2) Melt superheating treatment: heat the raw material to 1230°C for melting, then raise the temperature to 1600°C for overheating treatment, then cool the melt to the solidification temperature at a cooling rate of 35°C / s, and then heat up to 1600°C again Cooling, one superheating and one cooling are called a cycle, and a total of 3 cycles are performed;

[0038] (3) Cooling speed control after solidification: After solidification, under the protection of argon, the billet is cooled to 700 °C at an average speed of about 20 °C / min;

[00...

Embodiment 3

[0041] A preparation of bulk β-FeSi 2 A method for thermoelectric and photoelectric conversion materials, comprising the following preparation steps:

[0042] (1) Raw material ratio and heating method: The massive high-purity Fe and Si are mixed according to the mass percentage ratio of 1:1.04, and the quartz crucible with an inner diameter of φ20mm is used for high-frequency induction heating and melting. During the heating and melting process, the High-purity argon protection;

[0043] (2) Melt superheating treatment: After heating the raw material to 1220°C to melt, heat up to 1400°C for overheating treatment, and then quickly reduce the power of the induction heating power supply to cool the melt to the solidification temperature at a cooling rate of 20°C / s. Then re-heat to 1400°C and then cool down. One overheating and one cooling is called a cycle, and a total of 5 cycles are performed;

[0044] (3) Cooling speed control after solidification: After solidification, unde...

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Abstract

The invention discloses a method for preparing a block beta-FeSi2 thermoelectric and photoelectric conversion material. The large-size defect-free beta-FeSi2 material is prepared through circulating overheating treatment of a melt, solidification and cooling process control, and proper heat treatment. An FeSi2 casting blank prepared through the method has a fine and uniform alpha and epsilon eutectic structure, and the diameter of the rod-shaped epsilon phase in the eutectic phase is not greater than 2mum, so the heat treatment time of a peritectoid reaction of alpha + epsilon to beta is greatly shortened, thereby the preparation efficiency of the beta-FeSi2 material is substantially increased; and the preparation method does not need a vacuum apparatus, and the whole process flow is mainly composed of melt casing and heat treatment operations, so the method has the characteristics of simple apparatus, easy operating, short process flow and low preparation cost.

Description

technical field [0001] The invention belongs to the field of functional materials, relates to a method for preparing thermoelectric and photoelectric conversion materials, and in particular provides a high-efficiency preparation and processing method for bulk β-FeSi2 materials with high temperature resistance and high thermoelectric and photoelectric conversion efficiency. Background technique [0002] In the field of thermoelectric and photoelectric conversion materials, β-FeSi 2 It is considered to be one of the most promising environment-friendly semiconductor materials. Its raw materials, Fe and Si, are abundant in the earth’s crust. They are cheap, have low toxicity, good oxidation resistance, and strong environmental adaptability. They are widely used in near-infrared sensors, Light-emitting elements, solar cells, and thermoelectric conversion elements have a wide range of applications. [0003] As a thermoelectric material, β-FeSi 2 It has a high-temperature thermoe...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/18H01L35/22
Inventor 张志豪谢建新张驰付华栋
Owner UNIV OF SCI & TECH BEIJING
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