Lead-free acoustic vibration piezoelectric transduction material and preparation method thereof

Abstract

The invention provides a lead-free acoustic vibration piezoelectric transduction material and a preparation method thereof. The chemical composition of the lead-free acoustic vibration piezoelectric transduction material is (1-x) (K0. 5Na0. 5) (Nb0. 95Sb0. 05) O3-xBi0.5 (Na0.82K0.18)0.5HfO3, wherein x ranges from 0.03 to 0.05. The preparation process provided by the invention is simple, green andenvironment-friendly, and the prepared lead-free acoustic vibration piezoelectric transduction material has a good temperature stability characteristic within a certain temperature range while ensuring a high piezoelectric constant, and has a wide application value.

Description

technical field

[0001] The application belongs to the technical field of lead-free piezoelectric ceramics, and in particular relates to a preparation method of a lead-free acoustic vibration piezoelectric transducer material. Background technique

[0002] Piezoelectric ceramics have been widely used in many electronic devices, such as sensors and drivers. Although traditional lead-based ceramics have excellent performance, they are harmful to the environment and human health. Therefore, it is urgent to develop high-performance lead-free materials. In recent years, there have been countless studies on lead-free piezoelectric ceramics. At present, the research on lead-free piezoelectric materials mainly focuses on bismuth sodium titanate (BNT), potassium sodium niobate (KNN), barium calcium zirconate titanate (BCZT) and other systems. After a long period of research, these lead-free piezoelectric ceramic materials have made some progress in preparation and performance, but g...

Examples

Embodiment 1

[0029] Embodiment 1 Preparation of lead-free piezoelectric ceramic material

[0030] Chemical formula is

[0031] 0.965 (K 0.5 Na 0.5 )(Nb0.95 Sb 0.05 )O 3 -0.035Bi 0.5 (Na 0.82 K 0.18 ) 0.5 HfO 3 Preparation of lead-free piezoelectric ceramic materials:

[0032] Using analytically pure Na 2 CO 3 (99.8%), K 2 CO 3 (99%), Nb 2 o 5 (99.5%), Sb 2 o 3 (99.99%), Bi 2 o 3 (99.999%), HfO 2 (99%) is a raw material, weighed according to the molar ratio of metal atoms in the chemical formula, and takes ethanol as a medium ball mill for 24h, and then dries;

[0033] The dried nano-powder was calcined at 850°C for 6 hours; the calcined powder was mixed with an 8% PVA aqueous solution for granulation, and then pressed under a pressure of 10Mpa to form a diameter of 10mm, samples with a thickness of 1mm;

[0034] Raise the sample from room temperature to 150°C at a speed of 10°C / min, keep it warm for 40 minutes, remove the moisture adsorbed on the surface and inside an...

Embodiment 2

[0036] Embodiment 2 Piezoelectric performance test

[0037] The polarized lead-free piezoelectric ceramic sample prepared in Example 1 was placed naturally for 24 hours, and its performance was tested. Its density is 98.5% of the theoretical density; piezoelectric coefficient d 33 is 580pC / N, its reverse piezoelectric coefficient d 33 ﹡The fluctuation within the temperature range of 20~100℃ is not more than 10%. The Curie temperature Tc is 320°C, at 10 6 It still works after a cycle.

Embodiment 3

[0038] Embodiment 3 Preparation of lead-free piezoelectric ceramic material

[0039] The chemical formula is 0.97(K 0.5 Na 0.5 )(Nb 0.95 Sb 0.05 )O 3 -0.03Bi 0.5 (Na 0.82 K 0.18 ) 0.5 HfO 3 Preparation of lead-free piezoelectric ceramic materials:

[0040] Using analytically pure Na 2 CO 3 (99.8%), K 2 CO 3 (99%), Nb 2 o 5 (99.5%), Sb 2 o 3 (99.99%), Bi 2 o 3 (99.999%), HfO 2 (99%) is raw material, weighs according to the molar ratio of metal atoms in the chemical formula, takes ethanol as medium ball milling 20h, then dries;

[0041] The dried nano-powder was calcined at 900°C for 5 hours; the calcined powder was mixed with a PVA aqueous solution with a mass concentration of 6% for granulation, and then pressed under a pressure of 10Mpa to form a diameter of 10mm, samples with a thickness of 1mm;

[0042] Raise the sample from room temperature to 150°C at a speed of 10°C / min, keep it warm for 40 minutes, remove the moisture adsorbed on the surface and in...

technical field

[0001] The application belongs to the technical field of lead-free piezoelectric ceramics, and in particular relates to a preparation method of a lead-free acoustic vibration piezoelectric transducer material. Background technique

[0002] Piezoelectric ceramics have been widely used in many electronic devices, such as sensors and drivers. Although traditional lead-based ceramics have excellent performance, they are harmful to the environment and human health. Therefore, it is urgent to develop high-performance lead-free materials. In recent years, there have been countless studies on lead-free piezoelectric ceramics. At present, the research on lead-free piezoelectric materials mainly focuses on bismuth sodium titanate (BNT), potassium sodium niobate (KNN), barium calcium zirconate titanate (BCZT) and other systems. After a long period of research, these lead-free piezoelectric ceramic materials have made some progress in preparation and performance, but g...

Examples

Embodiment 1

[0029] Embodiment 1 Preparation of lead-free piezoelectric ceramic material

[0030] Chemical formula is

[0031] 0.965 (K 0.5 Na 0.5 )(Nb0.95 Sb 0.05 )O 3 -0.035Bi 0.5 (Na 0.82 K 0.18 ) 0.5 HfO 3 Preparation of lead-free piezoelectric ceramic materials:

[0032] Using analytically pure Na 2 CO 3 (99.8%), K 2 CO 3 (99%), Nb 2 o 5 (99.5%), Sb 2 o 3 (99.99%), Bi 2 o 3 (99.999%), HfO 2 (99%) is a raw material, weighed according to the molar ratio of metal atoms in the chemical formula, and takes ethanol as a medium ball mill for 24h, and then dries;

[0033] The dried nano-powder was calcined at 850°C for 6 hours; the calcined powder was mixed with an 8% PVA aqueous solution for granulation, and then pressed under a pressure of 10Mpa to form a diameter of 10mm, samples with a thickness of 1mm;

[0034] Raise the sample from room temperature to 150°C at a speed of 10°C / min, keep it warm for 40 minutes, remove the moisture adsorbed on the surface and inside an...

Embodiment 2

[0036] Embodiment 2 Piezoelectric performance test

[0037] The polarized lead-free piezoelectric ceramic sample prepared in Example 1 was placed naturally for 24 hours, and its performance was tested. Its density is 98.5% of the theoretical density; piezoelectric coefficient d 33 is 580pC / N, its reverse piezoelectric coefficient d 33 ﹡The fluctuation within the temperature range of 20~100℃ is not more than 10%. The Curie temperature Tc is 320°C, at 10 6 It still works after a cycle.

Embodiment 3

[0038] Embodiment 3 Preparation of lead-free piezoelectric ceramic material

[0039] The chemical formula is 0.97(K 0.5 Na 0.5 )(Nb 0.95 Sb 0.05 )O 3 -0.03Bi 0.5 (Na 0.82 K 0.18 ) 0.5 HfO 3 Preparation of lead-free piezoelectric ceramic materials:

[0040] Using analytically pure Na 2 CO 3 (99.8%), K 2 CO 3 (99%), Nb 2 o 5 (99.5%), Sb 2 o 3 (99.99%), Bi 2 o 3 (99.999%), HfO 2 (99%) is raw material, weighs according to the molar ratio of metal atoms in the chemical formula, takes ethanol as medium ball milling 20h, then dries;

[0041] The dried nano-powder was calcined at 900°C for 5 hours; the calcined powder was mixed with a PVA aqueous solution with a mass concentration of 6% for granulation, and then pressed under a pressure of 10Mpa to form a diameter of 10mm, samples with a thickness of 1mm;

[0042] Raise the sample from room temperature to 150°C at a speed of 10°C / min, keep it warm for 40 minutes, remove the moisture adsorbed on the surface and in...