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Piezoceramic material used for reversing radar sensor and preparation method thereof

A piezoelectric ceramic, parking radar technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve problems such as unfavorable vehicle parking radar sensor sensitivity, achieve stable performance indicators, improve Stability, the effect of reducing the rate of change of the resonant frequency

Active Publication Date: 2012-10-10
CHENGDU HUITONG WEST ELECTRONIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main disadvantage of the existing piezoelectric ceramic materials used in the production of automotive reversing radar sensors is: although the original PZT binary system materials can still meet the requirements at room temperature and positive and negative temperature performance, but the temperature coefficient can only reach 80ppm. The qualified rate is only 60%, which is not conducive to improving the sensitivity of the car reversing radar sensor

Method used

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  • Piezoceramic material used for reversing radar sensor and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] The main formula calculated by mass percentage includes: Pb 3 O 4 65%, SrCO 3 2%, Li 2 CO 3 0.2%, Sb 2 O 3 2%, TiO 2 12%, ZrO 2 18.8%, based on the total mass of the main formula, adding lanthanide rare earth oxide CeO 2 0.3%, and Y b2 O 3 0.4%.

[0023] The preparation method includes the following steps:

[0024] Step 1: Weigh the ingredients according to the recipe

[0025] The main formula includes (mass percentage) raw materials: Pb 3 O 4 65%, SrCO 3 2%, Li 2 CO 3 0.2%, Sb 2 O 3 2%, TiO 2 12%, ZrO 2 18.8%, CeO based on the total mass of the master recipe 2 0.3%, and Y b2 O 3 0.4% for ingredients;

[0026] Step 2, a ball milling

[0027] The raw materials prepared in step 1 are mixed in a ball mill, and steel balls are added. The weight ratio of steel balls to raw materials is 3.5:1, and the ball milling time is 6 hours to obtain powder. drying;

[0028] Step 3, pre-burn

[0029] Put the dried powder in ste...

Embodiment 2

[0060] The main formula calculated by mass percentage includes: Pb 3 O 4 68%, SrCO 3 1%, Li 2 CO 3 0.2%, Sb 2 O 3 1.5%, TiO 2 11.5%, ZrO 2 17.8%, CeO based on the total mass of the master recipe 2 0.3%, and Y b2 O 3 0.4%.

[0061] The preparation method is similar to the first embodiment, and specifically includes the following steps: (1) weighing according to the above formula; (2) primary ball milling; (3) pre-sintering; (4) secondary ball milling; The sensor method includes: (1) extrusion; (2) debinding; (3) sintering; (4) grinding to size; (5) silver printing; (6) silver burning; (7) polarization; (8) Aging; (9) Measurements that need to be implemented to further ensure the quality of the finished product.

Embodiment 3

[0063] The main formula calculated by mass percentage includes: Pb 3 O 4 65%, SrCO 3 2%, Li 2 CO 3 0.1%, Sb 2 O 3 2%, TiO 2 12%, ZrO 2 18.9%, CeO based on the sum of the mass of the master recipe 2 0.3%, and Y b2 O 3 0.4%.

[0064] The preparation method is similar to the first embodiment, and specifically includes the following steps: (1) weighing according to the above formula; (2) primary ball milling; (3) pre-sintering; (4) secondary ball milling; The sensor method includes: (1) extrusion; (2) debinding; (3) sintering; (4) grinding to size; (5) silver printing; (6) silver burning; (7) polarization; (8) Aging; (9) Measurements that need to be implemented to further ensure the quality of the finished product.

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Abstract

The invention discloses a piezoceramic material of which a main formula comprises, by mass percent, 65 to 68 % of Pb3O4, 1 to 2 % of SrCO3, 0.1 to 0.2 % of Li2O3, 1.5 to 2 % of Sb2O3, 11.5 to 12 % of TiO2 and 17.5 to 19 % of ZrO2, with the sum of each component in the main formula being 100 %. 0.7 to 1.5 % by mass percent of Lanthanide rare earth oxide is added on the basis of the total mass of the main formula. A preparation method comprises the following steps: (1) weighing materials according to the abovementioned formula; (2) ball milling for the first time; (3) pre-burning; and (4) ball milling for the second time. A method for preparing a reversing radar sensor using the piezoceramic material comprises: (1) pressing; (2) degumming; (3) sintering; (4) grinding in accordance with sizes; (5) printing silver; (6) silver-burning; and (7) polarizing. The piezoceramic material is used for preparing the reversing radar sensor. The invention has beneficial effects that a temperature coefficient of the piezoceramic material is less than 40 ppm, a qualified rate is more than 85 %, an electromechanical coupling coefficient Kp is 62%, a dielectric constant epsilon is 2200 and a mechanical quality factor Qm is 90. The formula is in favor of improving sensitivity of the reversing radar sensor, stabilizing capacitance, reducing aftershocks, improving qualified rate and reducing production cost.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric ceramics for electronic materials, in particular to piezoelectric ceramic materials and a preparation method applied to a reversing radar sensor, and further relates to an application to the preparation of a reversing radar sensor. Background technique [0002] Due to the diversity of its performance parameters, the research and development and utilization of vibration modes, and the advancement of device manufacturing technology, piezoelectric ceramics have developed rapidly in the past ten years and have become more and more widely used, which has a certain impact on the development of the entire national economy. influences. [0003] When stress is applied to some anisotropic polycrystalline ceramic materials, charges will appear on some surfaces of the ceramic, and an electric field will be generated inside. This effect is called the positive piezoelectric effect; on the contrary, a volt...

Claims

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Application Information

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IPC IPC(8): C04B35/491C04B35/622C04B41/88H01L41/187
Inventor 廖明成许世甫
Owner CHENGDU HUITONG WEST ELECTRONIC CO LTD
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