Method for preparing polar microcrystalline glass

A glass-ceramic and polar technology, applied in the field of material science, to achieve the effect of reliable process, novel principle and strong controllability

Inactive Publication Date: 2006-12-06
QINGDAO UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Advances in preparation technology are likely to make new breakthroughs in material properties

Method used

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Effect test

Embodiment 1

[0014] Select the barium oxide-titanium oxide-silicon oxide (BTS) glass system, according to the ordinary glass preparation process, mix the ingredients of chemically pure grade raw materials evenly, put them into the melting crucible, and place the crucible in the high temperature zone of the high temperature furnace. Melt at 1400-1500°C for 2-18 hours, stirring intermittently during the melting process. The molten glass is poured into a cast iron or graphite mold, and cast into a cylindrical sample with a diameter of 60mm and a height of 40mm, and the sample is annealed at 500-600°C for 1-4 hours. The annealed and cooled cylindrical glass sample is cut into a disc-shaped sample with a thickness of 6mm, and the two ends are properly ground and polished. Then put the treated sample on the high-gradient temperature directional crystallization furnace, and place positive and negative high-temperature electrode plates on both surfaces of the wafer. The relative positive and negat...

Embodiment 2

[0016] Select barium oxide-titanium oxide-silicon oxide (BTS) basic glass system, use chemically pure grade raw material ingredients, weigh the basic glass raw material powder to form glass ceramics in proportion, add 1% by weight of ZrO2 as the network external body addition , and then put the batch into the alumina ceramic ball mill for wet mixing and grinding for 6-18 hours. After drying, put the mixed abrasive into the alumina ceramic crucible. The length, width and height of the inner wall of the alumina ceramic crucible are 60mm, 80mm and 6mm respectively, and can be designed according to the shape requirements. Place the alumina crucible with batch materials in the high temperature zone of the silicon-molybdenum rod electric furnace, and then place high-temperature electrode plates on the upper and lower parallel surfaces of the melting crucible, and the relative positive and negative plate areas completely cover the glass to be melted and polarized For the sample, the ...

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Abstract

This invention relates to a method for manufacturing polar glass ceramic. The method comprises: (1) mixing raw material micropowder with 0-15 wt.% of melting agent and 0-15 wt.% of seed crystal powder, and putting into a crucible; (2) placing the crucible in a high-temperature electric furnace, melting, taking out, molding and cooling to form ordinary glass; (3) cutting into a certain shape, polishing, putting into the high-temperature zone of an ordinary high-temperature electric furnace or a temperature-gradient electric furnace, placing electrodes on both sides of the glass or the crucible, and crystallizing at a medium temperature; (4) simultaneously applying a DC electric field to assist orientation crystallization; (5) cooling and shaping to obtain the final product. The method is reliable, and easy to control. The polar ceramic glass has high crystallization volume fraction, high orientation degree, and stable quality.

Description

Technical field: [0001] The invention belongs to the field of material science, and relates to a method for preparing polar glass-ceramics, in particular to a method for preparing polar glass-ceramics by an electric field intervention auxiliary method. technical background: [0002] Polar glass-ceramics is a new type of composite functional material with non-ferroelectric polar crystallites such as piezoelectric and pyroelectric, which is obtained by controlled crystallization of molten amorphous inorganic materials. Its main feature is that the polar crystallites are oriented along the C axis to generate spontaneous polarization. The main difference from ferroelectric ceramics is that they do not require external electric field polarization and have piezoelectric, pyroelectric and other characteristics. Compared with piezoelectric single crystals, piezoelectric ceramics (such as PZT lead zirconate titanate) and organic piezoelectric materials, piezoelectric glass-ceramics a...

Claims

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Application Information

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IPC IPC(8): C03B32/02C03C10/00
Inventor 隋万美
Owner QINGDAO UNIV
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