Method for improving Seebeck coefficient of carbon fiber cement-based composite material

A composite material and carbon fiber technology, which is applied in the field of cement-based composite material preparation, can solve the problems of reduced mechanical properties and large water ash, and achieve the effects of moderate particle size, stable chemical composition, and improved Seebeck coefficient

Active Publication Date: 2013-02-13
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the scale-like morphology of the graphite used and the large specific surface area of ​​graphite, the water-cement ratio in the concrete preparation process is relatively large, and the mechanical properties after hardening are also greatly reduced. It can only be used in some engineering local parts that do not require high strength.

Method used

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  • Method for improving Seebeck coefficient of carbon fiber cement-based composite material
  • Method for improving Seebeck coefficient of carbon fiber cement-based composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: prepare the cavity to be the steel mold of cuboid, be the ratio of 0.01:0.01:1 according to mass ratio, get Fe 2 o 3 powder, PAN based chopped carbon fiber and sulphoaluminate cement.

[0022] Use ultrasonic wave to disperse PAN-based chopped carbon fiber in water evenly, form a mixture of chopped carbon fiber and water, add it to the mixer, and then add sulphoaluminate cement and Fe 2 o 3 powder, and 0.5% polycarboxylate superplasticizer by cement mass can also be added at the same time, and further stirred to form a carbon fiber cement mixture. The carbon fiber cement mixture is poured into a steel mold, and solidified in the mold to form a carbon fiber cement-based composite material sample.

[0023] A flat heater is used to generate a temperature difference ΔT on two opposite sides of the carbon fiber cement-based composite sample, one of which is gradually heated to 90°C by the flat heater (heating rate is 0.01°C / s), and the other side is kept roo...

Embodiment 2

[0024] Embodiment 2: prepare the cavity to be the steel mold of cuboid, be the ratio of 0.05:0.01:1 according to mass ratio, get Fe 2 o 3 powder, PAN based chopped carbon fiber and sulphoaluminate cement.

[0025] Use ultrasonic wave to disperse PAN-based chopped carbon fiber evenly in water to form a mixture of chopped carbon fiber and water, add it to the mixer, and then add sulphoaluminate cement and Fe 2 o 3 powder, and 0.5% polycarboxylate superplasticizer by cement mass can also be added at the same time, and further stirred to form a carbon fiber cement mixture. The carbon fiber cement mixture is poured into a steel mold, and solidified in the mold to form a carbon fiber cement-based composite material sample.

[0026] A flat heater is used to generate a temperature difference ΔT on the two opposite sides of the carbon fiber cement-based composite sample, one of which is gradually heated to 60°C by the flat heater (heating rate is 0.01°C / s), and the other side is kep...

Embodiment 3

[0027] Embodiment 3: prepare the cavity to be the steel mold of cuboid, be the ratio of 0.005:0.01:1 according to mass ratio, get Bi 2 o 3 powder, PAN based chopped carbon fiber and sulphoaluminate cement.

[0028] Use ultrasonic wave to disperse PAN-based chopped carbon fiber evenly in water to form a mixture of chopped carbon fiber and water, add it to the mixer, and then add sulphoaluminate cement and Bi 2 o 3 powder, and 0.5% polycarboxylate superplasticizer by cement mass can also be added at the same time, and further stirred to form a carbon fiber cement mixture. The carbon fiber cement mixture is poured into a steel mold, and solidified in the mold to form a carbon fiber cement-based composite material sample.

[0029] A flat heater is used to generate a temperature difference ΔT on the two opposite sides of the carbon fiber cement-based composite sample, one of which is gradually heated to 75°C by the flat heater (heating rate is 0.01°C / s), and the other side is ke...

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Abstract

The invention provides a method for improving Seebeck coefficient of a carbon fiber cement-based composite material. According to the method, Fe2O3 and/or Bi2O3 powders are added during preparing the carbon fiber cement-based composite material; a linear relation is generated between the thermoelectromotive force and the temperature difference of the carbon fiber cement-based composite material, and the Seebeck coefficient of the carbon fiber cement-based composite material is increased along with the increasing of the quantity of added Fe2O3 and/or Bi2O3 powders, so that the obtained carbon fiber cement-based composite material is high in Seebeck coefficient, stable in thermoelectric property, high in mechanical property, and simple in preparation technology, and avoids the problem that the Seebeck coefficient of the composite material is unstable due to the application of lightweight aggregate, steel slag or crystalline flake graphite; the carbon fiber is free from the technical processing of bromine intercalation, so that the problem due to environmental pollution caused by bromine vapor can be avoided, and the problem that the mechanical property of the cement-based composite material is reduced due to adoption of the lightweight aggregate, the steel slag or the intercalation crystalline flake graphite also can be avoided; and the cement-based composite material can be uniformly dispersed in a cement matrix.

Description

technical field [0001] The invention relates to a preparation method of a cement-based composite material, in particular to a method for increasing the Seebeck coefficient of a carbon fiber cement-based composite material. Background technique [0002] The thermoelectric effect of carbon fiber cement-based composite materials can linearly convert the temperature difference between the two ends of the material into thermoelectric potential, which can be stored in an energy storage device through an energy recovery circuit. It has medium and important application prospects in health monitoring of civil engineering structures, road solar heat conversion and collection, and waste heat recovery and utilization of large industrial kilns. It is one of the important directions for the research and development of intelligent cement-based composite materials. [0003] The thermoelectric properties of carbon fiber cement-based composites are closely related to the Seebeck coefficient, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/06
Inventor 魏剑郭琦贺格平杨春丽
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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