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The Method of Transition Metal Oxides to Improve the Seebeck Coefficient of Cementitious Composite Materials

A technology of transition metals and composite materials, applied in the manufacture of tools, ceramic molding machines, etc., can solve the problems of low Seebeck coefficient, achieve stable chemical properties, high electrical conductivity, and avoid microcracks

Active Publication Date: 2020-05-12
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to overcome the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of transition metal oxide to improve the method of Seebeck coefficient of cement-based composite material, can solve the problem that existing carbon fiber cement-based composite material Seebeck coefficient is low

Method used

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  • The Method of Transition Metal Oxides to Improve the Seebeck Coefficient of Cementitious Composite Materials
  • The Method of Transition Metal Oxides to Improve the Seebeck Coefficient of Cementitious Composite Materials
  • The Method of Transition Metal Oxides to Improve the Seebeck Coefficient of Cementitious Composite Materials

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Prepare a steel mold with a cuboid cavity, and take Ni 2 o 3 powder, PAN based chopped carbon fiber and sulphoaluminate cement.

[0026] Using a roller sand mixer to make Ni 2 o 3 The powder and PAN-based chopped carbon fiber are evenly dispersed in the cement matrix, and the uniformly mixed powder is dry-pressed with a steel mold at a pressure greater than 20Mpa, and cured to form a composite cement body.

[0027] A flat heater is used to generate a temperature difference ΔT between the two opposite end faces of the carbon fiber cement-based composite body, one end face is gradually heated to 100°C by the flat heater (heating rate is 0.01°C / s), and the other end face is at ambient temperature (Another flat heater heats the ambient temperature at the same heating rate after 10 minutes). Using self-made thermoelectric measuring device and 34972A data acquisition / switching system to simultaneously measure the thermoelectromotive force ΔV, temperature difference ΔT and...

Embodiment 2

[0029]Prepare a steel mold with a cuboid cavity, and take Co 2 o 3 powder, PAN based chopped carbon fiber and sulphoaluminate cement.

[0030] Co 2 o 3 The powder and PAN-based chopped carbon fiber are evenly dispersed in the cement matrix, and the uniformly mixed powder is dry-pressed with a steel mold at a pressure greater than 20Mpa, and cured to form a composite cement body.

[0031] A flat heater is used to generate a temperature difference ΔT between the two opposite end faces of the carbon fiber cement-based composite body, one end face is gradually heated to 100°C by the flat heater (heating rate is 0.01°C / s), and the other end face is at ambient temperature (Another flat heater heats the ambient temperature at the same heating rate after 10 minutes). Using self-made thermoelectric measuring device and 34972A data acquisition / switching system to simultaneously measure the thermoelectromotive force ΔV, temperature difference ΔT and resistance value generated between...

Embodiment 3

[0033] Prepare a steel mold with a cuboid cavity, and take Fe 2 o 3 powder, PAN based chopped carbon fiber and sulphoaluminate cement.

[0034] Using a roller sand mixer to make Fe 2 o 3 The powder and PAN-based chopped carbon fiber are evenly dispersed in the cement matrix, and the uniformly mixed powder is dry-pressed with a steel mold at a pressure greater than 20Mpa, and cured to form a composite cement body.

[0035] A flat heater is used to generate a temperature difference ΔT between the two opposite end faces of the carbon fiber cement-based composite body, one end face is gradually heated to 100°C by the flat heater (heating rate is 0.01°C / s), and the other end face is at ambient temperature (Another flat heater heats the ambient temperature at the same heating rate after 10 minutes). Using self-made thermoelectric measuring device and 34972A data acquisition / switching system to simultaneously measure the thermoelectromotive force ΔV, temperature difference ΔT and...

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Abstract

The method for improving the Seebeck coefficient of cement-based composite materials by transition metal oxides is to add transition metal oxide powder in the preparation process of carbon fiber cement-based composite materials to finally improve the Seebeck coefficient of cement-based composite materials. The amount of transition metal oxide powder added is carbon fiber The 45.0-75.0wt% of the used cement quality of cement-based composite material; The transition metal oxide powder (Ni 2 o 3 、Co 2 o 3 , Fe 2 o 3 or MnO 2 ) moderate particle size, which is conducive to its uniform dispersion in the cement matrix; the use of dry pressing molding avoids the problems of large water-cement ratio and the decrease of electrical conductivity caused by the use of polymer dispersants during the pouring molding process, and can obtain high mechanical strength. The cement-based composite material with high performance and electrical conductivity adopts the pre-curing process, which can effectively avoid the generation of microcracks during the curing process; in addition, the transition metal oxide powder used is chemically stable, and there is no chemical reaction with the cement hydration product. It is suitable for the use requirements of long-life concrete structures and complex application environments.

Description

technical field [0001] The invention belongs to the technical field of preparation of cement-based composite materials, in particular to a method for improving the Seebeck coefficient of cement-based composite materials by transition metal oxides. Background technique [0002] Thermoelectric materials, also known as thermoelectric materials, are functional materials that convert heat energy and electric energy into each other. Its main application areas include: low-grade thermal energy generation, large-scale low-cost energy harvesting or efficient heating. [0003] At present, the Seebeck coefficient of carbon fiber cement-based composites is low, which is still one of the main reasons for their poor thermoelectric performance, which limits the application of carbon fiber cement-based composites in the field of large-scale energy harvesting or high-efficiency heating. In addition, carbon fiber cement-based composite materials are used in the field of civil engineering str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06C04B14/38C04B22/06C04B28/04B28B3/00B28B11/24
CPCB28B3/00B28B11/245C04B14/386C04B22/06C04B28/04C04B28/06
Inventor 魏剑聂证博张倩赵莉莉
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY