Laser synthesis method of CaTiO3-CaTiSiO5

A technology of laser synthesis and gas laser, which is applied in the field of preparation of high-frequency dielectric ceramic materials, can solve the problems of complex process, low purity, and high energy consumption, and achieve the effect of simple process, high purity, and low energy consumption

Inactive Publication Date: 2010-12-29
ZHENGZHOU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a kind of CaTiO 3 -CaTiSiO 5 The laser synthesis method to overcome the CaTiO prepared by the current method 3 -CaTiSiO 5 Defects of low purity, complicated process and high energy consumption

Method used

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  • Laser synthesis method of CaTiO3-CaTiSiO5
  • Laser synthesis method of CaTiO3-CaTiSiO5
  • Laser synthesis method of CaTiO3-CaTiSiO5

Examples

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Effect test

Embodiment 1

[0032] CaCO used in the following examples 3 、TiO 2 and SiO 2 The powders were all 99.0% pure.

[0033] CaCO 3 、TiO 2 and SiO 2 The powders were mixed in a molar ratio of 1:1:0.5, the total amount was 10 g, ground in an agate mortar for 8 hours, dried at 120°C for 2 hours, and then ground in an agate mortar for 8 hours. Press the fully mixed powder into a compact under a pressure of 8Mpa and hold the pressure for 60s. The green body has a diameter of 14mm and a thickness of 3mm.

[0034] Place the green body on the sample stage, use CO with a laser power of 800W and a defocus of 90mm 2 The laser beam directly irradiates the green body, and the irradiation time is 190s. The prepared sample is tested in powder form by X-ray diffraction (XRD), density and dielectric constant, and the test results are shown infigure 1 and Table 1.

[0035] figure 1 The XRD results showed that high-purity CaTiO was synthesized 3 -CaTiSiO 5 Mutually.

Embodiment 2

[0037] The difference from Example 1 is that the laser power is 1000W, and the irradiation time is 170s. The prepared samples are processed, and the prepared samples are tested in powder form by X-ray diffraction (XRD), scanning electron microscope (SEM), density and dielectric constant. The test results are shown in figure 2 and Table 1.

Embodiment 3

[0039] The difference from Example 1 is that the laser power is 1200W, and the irradiation time is 140s. The prepared samples were processed, and the prepared samples were subjected to X-ray diffraction (XRD), scanning electron microscope (SEM), density and dielectric constant tests in bulk and powder form respectively. The test results are shown in image 3 , 4 , 6, 7 and Table 1.

[0040] in image 3 It is the XRD figure of powder, shows that the present invention can make high-purity CaTiO 3 -CaTiSiO 5 high frequency ceramics, Figure 4 It is a block XRD pattern, which shows that laser sintering has strong orientation growth. Image 6 It is the SEM photo of the section enlarged 300 times, showing that the prepared CaTiO 3 -CaTiSiO 5 The microstructure is relatively dense and there are no pores; Figure 7 It is a SEM photo of the cross-section magnified 500 times. It can be clearly seen that the crystal grains are large, growing in a dendritic structure, and have the...

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Abstract

The invention belongs to the technical field of the preparation of a high-frequency dielectric ceramic material and particularly relates to a fast laser synthesis method of CaTiO3-CaTiSiO5. The method comprises the following steps of: fully mixing, grinding and compacting analytically pure CaCO3 powder, TiO2 powder and SiO2 powder serving as raw materials, irradiating the raw materials by using 600 to 1,300W CO2 laser beams to make the raw materials react; and then cooling and condensing the reaction product to form ceramics so as to obtain the CaTiO3-CaTiSiO5, wherein the substance molar ratio of CaCO3, TiO2 to SiO2 is 1:1:0.5. The method has the advantages of simple process, high purity, low cost, and low energy consumption; and the obtained sample has the advantages of high density, high dielectric constant and high process repetitiveness.

Description

(1) Technical field [0001] The invention belongs to the technical field of preparation of high-frequency dielectric ceramic materials, in particular to a CaTiO 3 -CaTiSiO 5 laser synthesis method. (2) Background technology [0002] In recent years, with the rapid development of communication technology, higher requirements have been put forward for electronic components based on high-frequency dielectric ceramics. In order to meet the continuous requirements of electronic equipment for miniaturization, light weight, integration and high reliability, high-frequency dielectric ceramics with high dielectric constant, low dielectric loss and low dielectric temperature coefficient have been prepared by different methods. become the focus of current research. CaTiO 3 -CaTiSiO 5 It is an excellent high-frequency dielectric ceramic, which is made of monoclinic CaTiSiO 5 (ε≈40, tgδ≈5×10 -4 , α c ≈12×10 -4 / ℃) and orthorhombic CaTiO 3 (ε≈150, tgδ≈2.5×10 -4 , α c ≈-18×10 -...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/465C04B35/622
Inventor 晁明举田得雨梁二军张俊吉李明玉
Owner ZHENGZHOU UNIV
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