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High-efficiency cement-based piezoelectric material and synthesizing method thereof

A piezoelectric material, cement-based technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, superconductor components, etc., can solve the problems of easy generation of false signals, low sensitivity, low piezoelectric performance, etc., and achieve improved Effects of polarization efficiency and piezoelectric performance, improvement of dielectric constant and density, and reduction of external electric field strength

Inactive Publication Date: 2013-07-17
WUHAN UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, traditional 0-3 cement-based piezoelectric materials have low piezoelectric performance, low sensitivity, and poor sensing accuracy. For example, in the patent of cement-based piezoelectric intelligent composite material and its preparation method with publication number CN1569423, d 33 The highest value is only 31pC / N, so it is necessary to use a charge amplifier to strengthen the output of the electrical signal
In addition, the current traditional 0-3 cement-based piezoelectric materials need to be polarized at a high polarization electric field strength of 4-5KV / mm, and the input cost is relatively high
Moreover, its aging problem is serious, and it is easy to generate false signals, resulting in potential safety hazards

Method used

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  • High-efficiency cement-based piezoelectric material and synthesizing method thereof
  • High-efficiency cement-based piezoelectric material and synthesizing method thereof
  • High-efficiency cement-based piezoelectric material and synthesizing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0026] Take lead zirconate titanate (PZT) ceramic particles, ordinary portland cement (grade 52.5) ​​and silica fume of the reinforcing phase according to the proportions in Table 1, and use absolute ethanol as the medium, ball mill and mix for 15 minutes, dry, pass through 0.2mm Sieve and set aside. Then according to the water-binder ratio (the weight of water: the total weight of cement and reinforcing phase) is 0.2, add water and a polycarboxylate superplasticizer with a water reducing rate of 20%, and the addition of the superplasticizer is cement. 2%, stir evenly and press it into a 20mm×2mm disc. First, 20°C, 95% RH standard curing for 2 days, then 90°C, 100% RH, heat curing for 3 days, and finally scrub the surface with acetone, and then spread evenly on both sides of the disc. Coat the non-fired silver paste, bake in a drying oven at 80°C for 2 hours until dry, and then polarize in silicone oil at 100°C for 30 minutes, with a polarization electric field strength of 1.5...

Embodiment 9-12

[0057] Lead zirconate titanate (PZT) ceramic particles with a particle size of 70-200 μm, a piezoelectric strain constant of 374 pC / N, and a dielectric constant of 1700, ordinary Portland cement (grade 52.5) ​​and SiO 2 Reinforced phase quartz sand with a content of more than 90% and a particle size of 0.1-150 μm is taken according to the ratio in Table 7, mixed with absolute ethanol by ball milling, dried, and sieved through a 0.2 mm sieve for use. Then add water and a polycarboxylate superplasticizer with a water reducing rate of 20% according to the set water-binder ratio (weight of water: total weight of cement and reinforcing phase) and the amount of high-efficiency water-reducing agent, mix well and then press Formed into a 20mm×2mm disc, first 20°C, 95% RH standard curing for 2 days, then 90°C, 100% RH, heat curing for 3 days, finally scrub the surface with acetone, and then evenly coat the non-burning silver paste on both sides of the disc, Bake in a drying oven at 80°...

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Abstract

The invention relates to a high-efficiency cement-based piezoelectric material and a synthesizing method thereof. The high-efficiency cement-based piezoelectric material is characterized by comprising the following steps of: performing ball-milling on 45 to 70 volume percent of plumbum zirconate titanate (PZT) and the balance of cement and reinforcing phase, wherein the cement accounts for 65 to 95 weight percent, and the reinforcing phase accounts for 5 to 35 weight percent, mixing uniformly, adding water and a superplasticizer, stirring uniformly, pressing for forming, maintaining, and polarizing to obtain the high-efficiency cement-based piezoelectric material. After the high-efficiency cement-based piezoelectric material is placed for 30 days, a piezoelectric strain constant d33 is between 70 and 100 pC / N. The high-efficiency cement-based piezoelectric material is high in piezoelectric performance, a preparation process is easy and convenient, is small in required polarization voltage, low in cost and convenient to apply and popularize.

Description

technical field [0001] The invention belongs to the field of piezoelectric materials, and in particular relates to a high-efficiency cement-based piezoelectric material and a synthesis method thereof. Background technique [0002] Type 0-3 cement-based piezoelectric composite refers to a composite material formed by uniformly dispersing functional powder with piezoelectric effect in a three-dimensional continuous cement matrix. It has good compatibility with concrete, and is simple to prepare, uniform in structure, controllable in composition, and low in cost. , Offshore oil production platforms and port facilities, etc.) for long-term safety inspection and monitoring, and can also detect the speed and load of vehicles passing on road bridges online, so as to ensure the service life, operation economy and traffic safety of road bridges. [0003] At present, traditional 0-3 cement-based piezoelectric materials have low piezoelectric performance, low sensitivity, and poor sen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L39/12H01L41/39C04B28/00
Inventor 王发洲孙华君宋岩王浩
Owner WUHAN UNIV OF TECH
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