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Modified lead titanate piezoelectric ceramic material and preparation method thereof

A technology of piezoelectric ceramics and lead titanate, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve problems that affect the application of ceramics

Inactive Publication Date: 2012-05-23
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

lower T C severely affected the PbTiO 3 Application of ceramics

Method used

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  • Modified lead titanate piezoelectric ceramic material and preparation method thereof
  • Modified lead titanate piezoelectric ceramic material and preparation method thereof
  • Modified lead titanate piezoelectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Using trilead tetroxide, lanthanum trioxide, neodymium trioxide, manganese carbonate, antimony trioxide and titanium dioxide as raw materials, according to the molecular formula Pb 0.88 (La 0.6 Nd 0.4 ) 0.08 (Mn 1 / 3 Sb 2 / 3 ) 0.02 Ti 0.98 o 3 With the basic raw materials; the Co 2 o 3 Added to the base material as a dopant, Co 2 o 3 The mass percentage of base material is 0.45%;

[0022] Other conditions are the same as the comparison example. Its performance is shown in Table 1.

Embodiment 2

[0024] (1) Using trilead tetroxide, lanthanum trioxide, neodymium trioxide, manganese carbonate, antimony trioxide and titanium dioxide as raw materials, according to the molecular formula Pb 0.88 (La 0.6 Nd 0.4 ) 0.08 (Mn 1 / 3 Sb 2 / 3 ) 0.02 Ti 0.98 o 3 With the basic raw materials; the Co 2 o 3 Added to the base material as a dopant, Co 2 o 3 The mass percentage of base material is 0.65%;

[0025] Other conditions are the same as the comparison example. Its performance is shown in Table 1.

[0026] Table 1 is the performance comparison table test condition of the ceramic sample prepared by comparative example, embodiment 1 and 2 as follows:

[0027] The bulk density is measured by the Metler XS104 precision electronic balance according to the Archimedes drainage method;

[0028]Dielectric constant and dielectric loss: use the Agilent E4980 precision LCR meter to measure capacitance and dielectric loss at a frequency of 1kHz, and pass the formula ϵ ...

Embodiment 3

[0035] (1) Using trilead tetroxide, lanthanum trioxide, neodymium trioxide, manganese carbonate, antimony trioxide and titanium dioxide as raw materials, according to the molecular formula Pb 0.88 (La 0.6 Nd 0.4 ) 0.08 (Mn 1 / 3 Sb 2 / 3 ) 0.02 Ti 0.98 o 3 With the basic raw materials; the Co 2 o 3 Added to the base material as a dopant, Co 2 o 3 The mass percentage of base material is 0.15%;

[0036] (2) Using water as the medium, the raw material was ball milled for 12 hours, and after the discharge was dried, it was pressed into a block at 50 MPa. The pre-synthesis temperature was 900° C., the heating rate was 1° C. / min, and the temperature was kept for 1 hour. The block was ball milled again for 10 hours to obtain a powder.

[0037] (3) The diaphragm is held at 740°C for 3 hours for plastic discharge. The sintering temperature is 1170°C, and the holding time is 3 hours.

[0038] (4) The polarization electric field is 8000V / mm, the polarization temperature is 120°...

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Abstract

The invention discloses a modified lead titanate piezoelectric ceramic material, which takes Pb0.88 (La0.6Nd0.4) 0.08 (Mn1 / 3Sb2 / 3) 0.02Ti0.9803 system as a substrate, and Co203 as a doped oxide, wherein the doped amount of Co2O3 is 0.15 to 0.85 mass percent of the substrate. The invention also discloses a method for preparing the modified lead titanate piezoelectric ceramic material, which comprises the following steps of batching, mixing, roll forming, plastic removing and sintering the Pb0.88 (La0.6Nd0.4) 0.08 (Mn1 / 3Sb2 / 3) 0.02Ti0.9803 system serving as a substrate and the Co203. The piezoelectric ceramic material prepared by the invention has high Curie temperature and can meet the requirements on a lead-free welding process (such as reflow soldering); meanwhile piezoelectric coefficient d33 can reach 72 to 78 Pc / N, mechanical quality factor Qm can reach 2,000 to 2,200, and thickness mode electromechanical coupling coefficient kt can reach 42 to 49 percent; and application requirements on lead components, such as a high frequency device, a resonator, a filter and the like are met.

Description

technical field [0001] The invention relates to a modified lead titanate piezoelectric ceramic material and a preparation method thereof, belonging to the field of functional ceramic materials. Background technique [0002] Piezoelectric ferroelectric ceramics have excellent ferroelectricity, piezoelectricity, dielectricity, pyroelectricity, etc., and are widely used in functional ceramics, such as memories (ferroelectric applications), sensors, transducers, etc. Devices, filters (piezoelectric applications), infrared detectors (pyroelectric applications), capacitors (dielectric applications), etc., play an important role in the national economy and defense industry, and have formed a large-scale industry. Among them, lead titanate ceramics have excellent piezoelectric properties. Through various substitution and doping methods, people have overcome the difficulty of sintering and have obtained some formulas that are widely used in different fields, especially in the high fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/472C04B35/622H01L41/187H10N30/853
Inventor 朱满康欧阳明智侯育冬雷娜汪浩严辉
Owner BEIJING UNIV OF TECH