Unlock instant, AI-driven research and patent intelligence for your innovation.

Low-temperature sintered silica-based composite ceramics and its preparation method

A technology of composite ceramics and silica, which is applied in the field of low-temperature sintered silica-based composite ceramics and its preparation, can solve the problem of high sintering temperature, and achieve the effects of abundant sources, excellent microwave dielectric properties, and low cost

Inactive Publication Date: 2014-10-22
SHAANXI NORMAL UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Silicon dioxide (SiO 2 ) has excellent microwave dielectric properties (ε r =3.52, Q×f=92400GHz, τ f =-14.5ppm / ℃), which is rich in raw materials and low in cost, and is a promising low ε r , high-Q value microwave dielectric material for high frequency, but it has a high sintering temperature (1550 ° C) and a large negative τ f The disadvantage of the value, which limits its further application

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low-temperature sintered silica-based composite ceramics and its preparation method
  • Low-temperature sintered silica-based composite ceramics and its preparation method
  • Low-temperature sintered silica-based composite ceramics and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] To prepare composite ceramics 0.945SiO 2 -0.055Li 2 TiO 3 For example, the raw materials used and the preparation method are as follows:

[0022] 1. Preparation of SiO 2 nanosphere

[0023] Add 12mL of tetraethyl orthosilicate and 100mL of absolute ethanol into 30mL of deionized water, mix well, stir for 60 minutes, adjust the pH value to 11 with 25% ammonia solution by mass fraction, continue stirring for 1 hour, and then let stand for 24 hours , using a centrifuge at 4200 r / min to repeatedly wash with deionized water-centrifuge 6 times, put the precipitate in an oven and dry it at 120°C for 12 hours to obtain SiO 2 nanospheres.

[0024] 2. Preparation of Li 2 TiO 3 powder

[0025] 7.5399g Li 2 CO 3 and 7.9878 g TiO 2 Put it into an agate ball mill jar, add acetone as the ball milling medium, mill for 6 hours, put the ball milled mixture in an oven and dry it at 80°C for 4 hours, then put it into an alumina crucible and raise the temperature to 800°C at a he...

Embodiment 2

[0030] To prepare composite ceramics 0.935SiO 2 -0.065LiTiO 3 For example, the raw materials used and the preparation method are as follows:

[0031] In the step 3 of preparing low-temperature sintered silica-based composite ceramics in Example 1, according to 0.935SiO 2 -0.065Li 2 TiO 3 The stoichiometric ratio, weigh 8.9760g SiO 2 Nanospheres and 1.1415g Li 2 TiO 3 The powder was put into a polytetrafluoroethylene ball mill jar, and the other steps were the same as in Example 1 to prepare low-temperature sintered silica-based composite ceramics.

Embodiment 3

[0033] To prepare composite ceramics 0.925SiO 2 -0.075LiTiO 3 For example, the raw materials used and the preparation method are as follows:

[0034] In the step 3 of preparing low-temperature sintered silica-based composite ceramics in embodiment 1, according to 0.925SiO 2 -0.075Li 2 TiO 3 The stoichiometric ratio, weigh 8.88g SiO 2 Nanospheres and 1.3171g Li 2 TiO 3 The powder was put into a polytetrafluoroethylene ball mill jar, and the other steps were the same as in Example 1 to prepare low-temperature sintered silica-based composite ceramics.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
sintering temperatureaaaaaaaaaa
Login to View More

Abstract

Low temperature sintering silica based composite ceramic is formed by a material expressed in a general formula as (1-x) SiO2-xLi2TiO3, and the value of x in the formula is 0.055-0.085. The sintering temperature of the composite ceramic is 1050-1300 DEG C, and is obviously lowered compared with the sintering temperature of 1550 DEG C of the silicon dioxide ceramic, the defect of the large temperature coefficient of resonance frequency of a ceramic material is overcome, and the temperature stability of the material is ensured. The preparation method of the invention has the advantages that the adopted raw materials are rich, the cost is low, the industrial production is facilitated, and the method can be widely applied to the manufacture of microwave devices, such as microwave baseplates and the borneradome.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramics and its manufacture, and specifically relates to a microwave dielectric material, in particular to a low-temperature sintered silica-based composite ceramic and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials used in microwave frequency (300MHz ~ 300GHz) circuits as dielectric materials to complete one or more functions. Ideal microwave dielectric ceramics have a suitable dielectric constant (ε r ), a high quality factor (Q×f), and a temperature coefficient of resonant frequency that tends to zero (τ f ). Components such as resonators, filters, and microwave integrated circuit substrates made of microwave dielectric ceramics have been widely used in modern communication technologies such as mobile communications, wireless local area networks, and military communications. With the development of modern communication...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/14C04B35/462C04B35/622
Inventor 刘鹏胡成西刘远
Owner SHAANXI NORMAL UNIV