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Powder sintering method for reducing double-twin crystal defect density in BaTiO3 ceramic

A technology of defect density and sintering method, applied in the field of ceramic material powder sintering, can solve the problem of double twin defect microstructure and other problems, and achieve the effect of reducing double twin defect

Active Publication Date: 2022-01-04
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the invention is to solve BaTiO 3 Problems with the Microstructure of Twin Defects Occurred During Ceramic Sintering

Method used

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  • Powder sintering method for reducing double-twin crystal defect density in BaTiO3 ceramic
  • Powder sintering method for reducing double-twin crystal defect density in BaTiO3 ceramic
  • Powder sintering method for reducing double-twin crystal defect density in BaTiO3 ceramic

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Embodiment 1

[0029] Embodiment 1: a kind of reducing BaTiO provided by this embodiment 3 The powder sintering method of double twin defect density in ceramics, the steps are as follows:

[0030] (1) Raw material: undoped commercial BaTiO 3 Nano powder is raw material, weighs 1.5g.

[0031] (2) Calcination: the BaTiO weighed in step (1) 3 The nano-powder is calcined in an energy-saving box-type electric furnace. In order to ensure that the crystal grains in the powder will not be activated by heat and grow, the calcining temperature is 800°C.

[0032] (3) Sintering: Carry out SPS sintering at 950°C to the calcined powder, keep the temperature at 950°C for 10 minutes during SPS sintering, and drop to room temperature suddenly after heating.

[0033] (4) Annealing: In order to solve the problem of carbon pollution of the sample after SPS sintering, the sample was annealed in an energy-saving box-type electric furnace, the annealing temperature was 800 °C, and the holding time was 2 h.

[...

Embodiment 2

[0037] Embodiment 2: a kind of reducing BaTiO provided by this embodiment 3 The powder sintering method of double twin defect density in ceramics, the steps are as follows:

[0038] (1) Raw material: undoped commercial BaTiO 3 Nano powder is raw material, weighs 1.5g.

[0039] (2) Sintering: the BaTiO weighed in step (1) 3 The nano-powder was put into SPS for sintering. During SPS sintering, it was kept at 950°C for 10 minutes. In order to ensure the integrity of the sample, it was slowly lowered to room temperature after heating.

[0040] (3) Annealing: In order to solve the problem of carbon pollution of the sample after SPS sintering, the sample was annealed in an energy-saving box-type electric furnace, the annealing temperature was 800 °C, and the holding time was 2 h.

[0041] (4) Sintering: put the annealed sample into a box-type muffle furnace for sintering to 1100°C and keep it for 10 minutes, and then cool with the furnace after heating.

[0042] (5) Grinding sampl...

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Abstract

The invention discloses a powder sintering method for reducing double-twin crystal defect density in BaTiO3 ceramic, which comprises the following steps of: calcining undoped BaTiO3 commercial nano powder in an energy-saving box type electric furnace at 800 DEG C to enable the powder to be in full contact with air, and then putting the calcined powder into a spark plasma sintering (SPS) device for sintering to 900-1200 DEG C. Compared with the SPS sintering of the powder which is not calcined in the air, the double-twin crystal defect density of a sample is greatly reduced through a proper powder calcining atmosphere.

Description

technical field [0001] The invention belongs to the technical field of ceramic material powder sintering, in particular to a method for reducing BaTiO 3 Powder sintering method for twin defect density in ceramics. Background technique [0002] Twins are a type of interface that widely exists in nature and are considered as a defect. It is more common in metal materials. It can improve the yield strength of metal while ensuring the ductility of metal (Y. Gao, et al. Materials Science & Engineering A 767 (2019) 138361), which is similar to the effect of fine grain strengthening. However, it is rarely seen in ceramic materials, especially in ABO3-type perovskite ceramic materials. The interface energy of twin twins is very low, only 1 / 10 to 1 / 2 of that of ordinary grain boundaries, and it is stable. Therefore, it is difficult to eliminate the twin defects once they are formed. [0003] The excellent properties of ceramic materials can be achieved by changing their own micro...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622C04B35/64
CPCC04B35/468C04B35/622C04B35/64C04B2235/6562C04B2235/6567C04B2235/662C04B2235/666C04B2235/76
Inventor 吴国强胡剑峰刘文杰蔣怡彬
Owner SHANGHAI UNIV