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Laser preparing method for Ta2O5 base transparent ceramics

A transparent ceramic, ta2o5 technology, applied in the field of preparation of Ta2O5-based transparent ceramics, can solve the problems of difficult control of the preparation process, high preparation cost, complicated preparation process, etc., achieve easy continuous production, reduce preparation cost, and strong process controllability Effect

Inactive Publication Date: 2005-03-02
CHENGDU 3D CHANGE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the current technology mostly adopts sintering furnace sintering method to prepare Ta 2 o 5 Based ceramics, the relative density is less than 95%, it is difficult to achieve the approximate theoretical density and extremely low porosity required for ceramic transparency
For other types of ceramics that have obtained transparent products, the current preparation process is complicated, and it is usually necessary to use sintering aids, atmosphere sintering or hot-pressing sintering to increase the density of ceramics, reduce the porosity and sintering temperature in the sintered body, etc.; Strict requirements on raw material powder, powder prepared by special chemical process, high preparation cost; long sintering time (usually several hours or even tens of hours), high energy consumption; crucible or closed sintering equipment is required for sintering, which cannot Directly observe the sintering process, the preparation process is difficult to control

Method used

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  • Laser preparing method for Ta2O5 base transparent ceramics
  • Laser preparing method for Ta2O5 base transparent ceramics
  • Laser preparing method for Ta2O5 base transparent ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Will Ta 2 o 5 The powder is pre-fired at 1350°C for 4.8 hours, and then pressed into a billet; the laser is used as the direct heat source, and the temperature is 1250w / cm 2 The power density of the Ta 2 o 5 The ceramic billet is preheated; after the preheating is completed, the laser power density is adjusted to 5700w / cm 2 After sintering for 50s, the laser was turned off, and the sample was cooled to room temperature to obtain a transparent Ta 2 o 5 sample. The bulk density of the transparent sample is 8.396g / cm 3 , The relative density is 99.95%.

[0023] From figure 1 : Ta 2 o 5 It can be seen from the transparent ceramic renderings that the prepared Ta 2 o 5 Transparent ceramics have good light transmission.

[0024] From figure 2 : Ta 2 o 5 It can be seen from the metallographic diagram of the transparent ceramic light transmission microscope that the prepared sample has extremely low porosity, relatively well-developed crystal grains, uniform siz...

Embodiment 2

[0026] Ta 2 o 5 and TiO 2 The powder is pre-fired at 1200°C for 5 hours, and then pressed into a billet; the laser is used as the direct heat source, and the temperature is 800w / cm 2 The power density of the (Ta 2 o 5 ) 0.92 (TiO 2 ) 0.08 The ceramic billet is preheated; after the preheating is completed, the laser power density is adjusted to 5200w / cm 2 After sintering for 30s, the laser was turned off, and the sample was cooled to room temperature to obtain a transparent (Ta 2 o 5 ) 0.92 (TiO 2 ) 0.08 ceramic samples. The bulk density of the transparent sample is 8.239g / cm 3 , the relative density is 98.08%.

[0027] From image 3 :( 2 o 5 ) 0.92 (TiO 2 ) 0.08 As can be seen from the transparent ceramic renderings, the prepared (Ta 2 o 5 ) 0.92 (TiO 2 ) 0.08 Transparent ceramics have good light transmission.

Embodiment 3

[0029] Ta 2 o 5 and TiO 2 The powder is pre-fired at 1250°C for 5.6 hours, and then pressed into a billet; the laser is used as the direct heat source, and the temperature is 1150w / cm 2 The power density of the (Ta 2 o 5 ) 0.92 (TiO 2 ) 0.08 The ceramic billet is preheated; after the preheating is completed, the laser power density is adjusted to 4800w / cm 2 After sintering for 40s, the laser was turned off, and the sample was cooled to room temperature to obtain a transparent (Ta 2 o 5 ) 0.92 (TiO 2 ) 0.08 ceramic samples. The bulk density of the transparent sample is 8.218g / cm 3 , the relative density is 97.83%.

[0030] Figure 4 :( 2 o 5 ) 0.92 (TiO 2 ) 0.08The characteristic peaks shown in the X-ray diffraction spectrum of transparent ceramics are sharp and there are no miscellaneous peaks, indicating that the prepared sample is pure in phase, free of impurities, and has a uniform single-phase structure.

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Abstract

The present invention provides a one kind of Ta2O5 base transparent ceramic product and its laser preparation process, and belongs to the field of ceramic material preparing technology. The Ta2O5 powder or mixed powder of Ta2O5 and TiO2 in the ratio of 92 to 8 is first pre-sintered at 1200-1350 deg.c for 4.8-5.6 hr and is pressed into Ta2O5 base ceramic biscuit; the Ta2O5 base ceramic biscuit is then preheated via irradiation with laser in the power density of 800-1250 w / sq cm for 50-90 sec, and finally sintered with laser in the power density of 4800-5700 w / sq cm for 30-50 sec before cooling to room temperature. The Ta2O5 base transparent ceramic has high density, lowest relative density higher than 97 % and average relative density near theoretical value. The present invention uses communication industrial powder material, and has simple technological process, low power consumption, short preparation process, and low cost.

Description

technical field [0001] The invention belongs to Ta 2 o 5 The field of preparation of base transparent ceramics. Background technique [0002] Ta 2 o 5 Base ceramics are dielectric materials used in capacitive dielectric storage and integrated circuits. On page 5, lines 24-26 of the book "Transparent Ceramics" published in 1980 by the former Soviet Union r.A. Vedlik et al., translated by Chen Wanhua, and corrected by Gao Longqiao, it is pointed out that "transparent ceramic materials can be used as storage devices. Microwave substrates and integrated circuit boards. High-quality integrated circuits can be obtained with almost completely non-porous high-density transparent ceramic materials.”, but so far, there is no relevant transparent Ta at home and abroad. 2 o 5 A report on ceramic-based ceramics and their preparation methods. Transparent Ta 2 o 5 The base ceramic has a pure phase and no impurities, and the functional processes in the material, such as phase trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/64
Inventor 蒋毅坚季凌飞
Owner CHENGDU 3D CHANGE TECH
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