Preparation method for sintering sodium bismuth titanate-based lead-free piezoelectric ceramics at low temperature

A bismuth sodium titanate-based, low-temperature sintering technology, applied in the field of piezoelectric ceramic devices, can solve the problems of ceramic piezoelectric performance degradation and other problems

Inactive Publication Date: 2014-06-25
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the way of using sintering aids to reduce the sintering temperature, it is a more effective method to form liquid phase sintering. In liquid phase sintering, grain rearrangement and enhanced contact can improve the mobility of grain boundaries, fully d

Method used

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  • Preparation method for sintering sodium bismuth titanate-based lead-free piezoelectric ceramics at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment one: The formula of this embodiment is (1-x) Bi 0.5 Na 0.5 TiO 3 -xSrFeCo 0.5 o y ,in x =0.00.

[0016] Take Na 2 CO 3 、TiO 2 、 Bi 2 o 3 As a raw material, it is weighed according to the stoichiometric ratio, batched according to the conventional solid phase synthesis method, mixed by ball milling for 8 hours, dried, shaped, sintered at 1050°C for 3 hours, and the ceramic composite with the perovskite structure as above is formed.

[0017] For the bismuth sodium titanate-based lead-free piezoelectric ceramics obtained, the silver electrodes were cleaned after ultrasonic cleaning. At room temperature, it was polarized in silicone oil at 8kV / mm for 30min, and then the piezoelectric performance parameters of the ceramic samples were tested.

[0018] figure 1 The XRD pattern of the obtained sample is given, and it can be seen that the material is a single perovskite phase structure. Table 1 shows the electrical properties of the samples, but sinc...

Embodiment 2

[0019] Embodiment two: The formula of this embodiment is (1-x) Bi 0.5 Na 0.5 TiO 3 -xSrFeCo 0.5 o y ,in x =0.02.

[0020] Take Na 2 CO 3 、TiO 2 、 Bi 2 o 3 、SrFeCo 0.5 o y as raw material, weighed according to the stoichiometric ratio,

[0021] According to the conventional solid phase synthesis method, batching, ball milling and mixing for 8 hours, drying, molding, sintering at 1050° C. for 3 hours, the ceramic composite with perovskite structure as above formula is formed.

[0022] For the bismuth sodium titanate-based lead-free piezoelectric ceramics obtained, the silver electrodes were cleaned after ultrasonic cleaning. At room temperature, it was polarized in silicone oil at 8kV / mm for 30min, and then the piezoelectric performance parameters of the ceramic samples were tested.

[0023] figure 1 The XRD pattern of the obtained sample is given, and it can be seen that the material is a single perovskite phase structure. Table 1 shows the electrical proper...

Embodiment 3

[0025] Embodiment three: The formula of this embodiment is (1-x) Bi 0.5 Na 0.5 TiO 3 -xSrFeCo 0.5 o y ,in x =0.04.

[0026] Take Na 2 CO 3 、TiO 2 、 Bi 2 o 3 、SrFeCo 0.5 o y as raw material, weighed according to the stoichiometric ratio,

[0027] According to the conventional solid phase synthesis method, batching, ball milling and mixing for 8 hours, drying, molding, sintering at 1050° C. for 3 hours, the ceramic composite with perovskite structure as above formula is formed.

[0028] For the bismuth sodium titanate-based lead-free piezoelectric ceramics obtained, the silver electrodes were cleaned after ultrasonic cleaning. At room temperature, it was polarized in silicone oil at 8kV / mm for 30min, and then the piezoelectric performance parameters of the ceramic samples were tested.

[0029] figure 1 The XRD pattern of the obtained sample is given, and it can be seen that the material is a single perovskite phase structure. Table 1 shows the electrical prop...

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Abstract

The invention relates to a method for sintering sodium bismuth titanate-based lead-free piezoelectric ceramics at low temperature. The method comprises the following steps: by taking SrFe0.5Co0.5Oy (y is more than 2 and less than 4) as a sintering aid, batching according to a stoichiometric ratio of a chemical formula (1-x)Bi0.5Na0.5TiO3-xSrFeCo0.5Oy and taking Na2CO3, TiO2, Bi2O3 and SrFeCo0.5Oy as raw materials, performing ball-milling and mixing, drying, molding, and sintering at the temperature of 950-1080 DEG C for 2-4 hours, thereby obtaining the sodium bismuth titanate-based lead-free piezoelectric ceramics, wherein x is equal to 0.00-0.06. A ceramic sample sintered in a range of x=0.00-0.06 has high density, the relative density is larger than 90 percent, the high mechanical quality factor Qm is greater than 217, the high remanent polarization Pr is greater than 26mu C/cm<2>, the piezoelectric constant d33 is greater than 92pC/N and the electromechanical coupling factor kp is greater than 15%, the Curie temperature is larger than 300 DEG C, and the material has good application prospects.

Description

technical field [0001] The invention belongs to the field of bismuth sodium titanate base (BNT) lead-free piezoelectric ceramic materials, in particular to a strontium iron cobalt oxide (SrFe 0.5 co 0.5 o y ) as a method for low-temperature sintering of high-performance BNT-based lead-free piezoelectric ceramics as a sintering aid, and also relates to a piezoelectric ceramic device comprising the composite. Background technique [0002] At present, lead-based piezoelectric ceramics represented by lead zirconate titanate (PZT) still occupy a dominant position in commercial applications, but the lead content of PZT ceramics is as high as more than 60%, which will cause ecological problems during production, use and disposal. Environmental pollution, endangering human health (G.F.Fan, W.Z. Lu, X.H. Wang, and F. Liang, Morphotropic phase boundary and piezoelectric properties of Bi 1 / 2 Na 1 / 2 TiO 3 - Bi 1 / 2 K 1 / 2 TiO 3 -KNbO 3 lead-free piezoelectric ceramics. [J]. Appl...

Claims

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Application Information

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IPC IPC(8): C04B35/475C04B35/622C04B35/63
Inventor 初瑞清邵林徐志军郝继功陈明丽姬万滨马帅
Owner LIAOCHENG UNIV
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