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2-2 type cement base piezoelectric composite material

A piezoelectric composite material and composite material technology, applied in the field of smart materials, can solve the problems of poor compatibility of concrete, acoustic impedance matching, deformation coordination, stiffness and interface adhesion, false signals of smart materials, affecting sensing accuracy, etc. The effect of low cost, good durability and simple preparation process

Inactive Publication Date: 2009-09-23
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to the late start of research on smart materials used in the field of civil engineering in various countries, the smart materials currently used in the field of civil engineering, such as optical fibers, piezoelectric ceramics, carbon fibers, etc., have single functions and are not compatible with the field of civil engineering. The most important structural material in the system - poor compatibility of concrete (such as acoustic impedance matching, deformation coordination, stiffness and interface adhesion, etc.), which will cause false signals generated by smart materials and affect sensing accuracy , and even lead to wrong judgment

Method used

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  • 2-2 type cement base piezoelectric composite material
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  • 2-2 type cement base piezoelectric composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Effect of volume fraction of piezoelectric ceramics on properties of piezoelectric composites

[0031] Such as figure 1 As shown (the same below), the 2-2 type cement-based piezoelectric composite material of the present invention includes alternately arranged cement layers 3 and piezoelectric ceramic sheets 4, and an upper electrode 1 on the upper surface and a lower electrode on the lower surface. Electrode 2.

[0032] It is made by the following method: polarize a cuboid piezoelectric ceramic block; use a slicer to cut out the piezoelectric ceramic pieces sequentially along the direction parallel to the polarization axis of the piezoelectric ceramic, without cutting the entire piezoelectric ceramic block during the cutting process. The ceramic block is cut through, leaving a base; the cut ceramic block is repeatedly cleaned to remove the remaining ceramic residue; the cleaned ceramic block is placed in the mold, and cement is poured according to a certain...

Embodiment 2

[0038] Example 2: The effect of water-cement ratio on the performance of piezoelectric composite materials

[0039] Using sulfoaluminate cement and polarized lead niobium magnesium zirconate titanate ceramics as raw materials, along the polarization direction of the lead niobium magnesium zirconate titanate piezoelectric ceramics, the length (X-axis direction) of 19mm, a width (Y-axis direction) of 1mm, a thickness (Z-axis direction) of 6.5mm, and the spacing of the ceramic sheets is also 1mm. After cleaning and drying, fix the ceramic block in the mold, put it on the vibrating table, fully stir the cement and water respectively according to the water-cement ratio of 0.30, 0.35, 0.40, 0.45, and 0.50, and then under the condition of constant vibration, place the Cement is poured into the mold, vacuumed and cured. The effect of water-cement ratio on the performance of piezoelectric composites is shown in Table 4.

[0040] Table 4 Properties of piezoelectric composites with dif...

Embodiment 3

[0043] Example 3: Effect of composite material thickness on the performance of piezoelectric composite materials

[0044]Using sulfoaluminate cement as the matrix and lead niobium magnesium zirconate titanate piezoelectric ceramics as the functional body, a cement-based piezoelectric composite material with a volume fraction of piezoelectric ceramics of 53.85% was prepared. The size of the ceramic sheet is as follows, the length (X-axis direction)×width (Y-axis direction) is 19mm×1mm, and the thickness (Z-axis direction) is 10.5mm, 9.7mm, 7.6mm, 6.6mm, 5.0mm respectively. The pitch of the ceramic sheets is 1mm. After cleaning and drying the cut ceramic block, fix it in the mold, place it on the vibrating table, fully mix the cement and water according to the water-cement ratio of 0.35, and pour the cement into the mold under constant vibration .

[0045] After curing for 7 days in a standard curing room (20±1°C, relative humidity ≥90%), grind and polish. Scrub the surface o...

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Abstract

The invention relates to a 2-2 type cement base piezoelectric composite material which belongs to an intelligent material in the civil engineering field. The composite material is manufactured by the following method: polarizing a cuboid piezoelectric ceramic block; using a slicer to sequentially cut out a series of piezoelectric ceramic pieces along the direction parallel to a piezoelectric ceramic polaxis and pouring cement according to a certain cement water ratio; after finishing the pouring, putting both a sample and a mould in a vacuum drying box for carrying out vacuum processing; putting the sample in a maintenance box for maintenance; and uniformly coating low-temperature conductive silver ink or plating an electrode on the two surfaces after two parallel surfaces are respectively sanded and polished so as to prepare the 2-2 type cement base piezoelectric composite material. The 2-2 type cement base piezoelectric composite material has the advantages of good piezoelectric performance and compatibility with concrete, integration of sensing and driving, good durability, simple preparation process, low cost, and the like.

Description

technical field [0001] The invention relates to a cement-based piezoelectric composite material, belonging to intelligent materials in the field of civil engineering. Background technique [0002] In order to ensure the safety, applicability and durability of major civil engineering structures, the use of smart materials to implement online health monitoring has become a frontier research direction in the field of civil engineering worldwide. [0003] However, due to the late start of research on smart materials used in the field of civil engineering in various countries, the smart materials currently used in the field of civil engineering, such as optical fibers, piezoelectric ceramics, carbon fibers, etc., have single functions and are not compatible with the field of civil engineering. The most important structural material in the system - poor compatibility of concrete (such as acoustic impedance matching, deformation coordination, stiffness and interface adhesion, etc.)...

Claims

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Application Information

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IPC IPC(8): C04B32/00C04B41/69
Inventor 黄世峰徐东宇叶正茂廖双双程新
Owner UNIV OF JINAN
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