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Laser synthesis method for barium tetratitanate

A technology of barium tetratitanate and laser synthesis, which is applied in the field of preparation of microwave dielectric ceramic materials, can solve the problems of long preparation time and high energy consumption, and achieve the effects of low cost, low energy consumption and short time consumption

Inactive Publication Date: 2010-05-12
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a laser synthesis method of barium tetratitanate, which can overcome the shortcomings of the existing preparation methods such as long time consumption and high energy consumption.

Method used

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  • Laser synthesis method for barium tetratitanate
  • Laser synthesis method for barium tetratitanate
  • Laser synthesis method for barium tetratitanate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] BaCO 3 and TiO 2 The powders were mixed in a molar ratio of 1:4, ground in an agate mortar for 1 hour, dried at 150°C for 2 hours, and then ground in an agate mortar for 2 hours. Press the fully mixed powder into a compact under a pressure of 20Mpa, and hold the pressure for 60s. The green body has a diameter of 14mm and a thickness of 3mm.

[0025] Place the green body on the sample stage, and use CO 2 The laser beam directly irradiates one side of the sample for 40s, and the opposite side for 80s. During this process, the laser power is 600W, and the defocus distance is 120mm. The prepared samples were processed and tested for density and dielectric constant. The test results are shown in Table 1.

Embodiment 2

[0027] BaCO 3 and TiO 2 The powders were mixed in a molar ratio of 1:4, ground in an agate mortar for 1 hour, dried at 150°C for 2 hours, and then ground in an agate mortar for 2 hours. The fully mixed powder is compacted under a pressure of 20MPa, and the pressure is maintained for 60s. The green body has a diameter of 14mm and a thickness of 2mm.

[0028] Place the green body on the sample stage, and use CO 2 The laser beam directly irradiates one side of the sample for 40s, and the opposite side for 80s. During this process, the laser power is 800W, and the defocus distance is 120mm. The prepared samples were processed and subjected to X-ray diffraction (XRD), scanning electron microscope (SEM), density and dielectric constant tests. The test results are shown in Table 1.

[0029] The XRD spectrum of the obtained sample is shown in figure 1 , the SEM photograph of its cross-section is shown in figure 2 . XRD spectrogram shows that the present invention can make the...

Embodiment 3

[0031] BaCO 3 and TiO 2 The powders were mixed in a molar ratio of 1:4, ground in an agate mortar for 1 hour, dried at 150°C for 2 hours, and then ground in an agate mortar for 2 hours. The fully mixed powder is compacted under a pressure of 20MPa, and the pressure is maintained for 60s. The green body has a diameter of 14mm and a thickness of 4mm.

[0032] Place the green body on the sample stage, and use CO 2 The laser beam directly irradiates one side of the sample for 40s, and the opposite side for 80s. During this process, the laser power is 1000W, and the defocus distance is 120mm. The prepared samples were processed and tested for density and dielectric constant. The test results are shown in Table 1.

[0033] Table 1 shows process parameters and sample performance test results in Examples 1-3. The sample average density prepared by the present invention is 4.39g / cm 3 , which is 96.9% of the theoretical density value; the average value of the dielectric constant ...

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Abstract

The invention belongs to the technical field of preparing a microwave dielectric ceramic material, and particularly relates to a laser synthesis method for barium tetratitanate. The method comprises the following steps of: taking BaCO3 and TiO2 powder as raw materials; fully mixing, grinding and pressing the powder; then irradiating the materials with a CO2 laser beam of 600 to 1,000W to make the materials react; and cooling and solidifying the mixture into ceramic to finally obtain the barium tetratitanate. The ratio of amount of substance of the BaCO3 to the TiO2 is 1:4. The method has the advantages of simple process, low cost, low time consumption and low energy consumption; and the obtained samples have high density, high dielectric constant and good process repeatability.

Description

(1) Technical field [0001] The invention belongs to the technical field of preparation of microwave dielectric ceramic materials, in particular to a laser synthesis method of barium tetratitanate. (2) Background technology [0002] Microwave dielectric ceramics are widely used in radar, satellite, mobile phone and GPS in modern communication technology. O'Bryan et al. (Journa 1of American Ceramic Society, 57 (1974) 522-527) and Masse et al. (IEEE 59 (1971) 1628-1632) have demonstrated that barium tetratitanate (BaTi 4 o 9 ) including barium titanate can be used as an excellent microwave dielectric ceramic. Masse et al pointed out that under the condition of 1MHz, BaTi 4 o 9 The dielectric constant ε=38. Since then, a series of studies have been carried out in related fields. S.G.Mhaisalkar et al. (Journal of American Ceramic Society, 72 (1989) 2154-2158) and F. Li et al. (Materials Letters, 59 (2005) 2973-2976) used traditional solid phase reaction method and sol-gel m...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/468
Inventor 晁明举张俊吉梁二军李明玉田得雨
Owner ZHENGZHOU UNIV
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