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Low-temperature sintering Ti-base microwave medium ceramic material and preparation thereof

A microwave dielectric ceramic and low-temperature sintering technology is applied in ceramics, inorganic insulators and other directions to achieve the effects of good microwave performance, simple chemical composition and preparation process, and high dielectric constant.

Inactive Publication Date: 2008-05-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microwave dielectric resonators made of high dielectric constant microwave materials can greatly improve the size of microwave circuits, but the way out for further miniaturization lies in the development of MCM

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The chemical raw material anatase TiO 2 , Bi 2 o 3 By formula (1-m)TiO 2 -mBi 2 Ti 4 o 11 Preparation, where m = 0.08. After preparation, fully mix and ball mill for 4 hours, then dry, sieve, briquette, pre-fire at 850°C-950°C for 5-6 hours, then crush the block sample after pre-burning and add 2wt% CuO was ball milled for 5 hours for the second time, finely ground and dried, then granulated, and sieved through a double layer of 70-mesh sieve and 120-mesh sieve to obtain the desired ceramic material. The ceramic material is pressed into shape (sheet or column) as required, and then sintered in air at 870°C-930°C for 2-3 hours to form porcelain, and the low-temperature sintered Ti-based microwave dielectric ceramic material can be obtained.

[0030] The performance of this group of ceramic materials reaches the following indicators:

[0031] Dielectric properties under microwave ε r =81 (4.9GHz), quality factor Q=720, Qf=3500GHz, resonant frequency temperature c...

Embodiment 2

[0033] The chemical raw material anatase TiO 2 , Bi 2 o 3 By recipe Bi 2 Ti 4 o 11 After preparation, fully mix and ball mill for 4 hours, then dry, sieve, briquette, pre-fire at 850°C-950°C for 5-6 hours, and then crush the pre-fired block sample, and mix with anatase TiO 2 By formula (1-m)TiO 2 -mBi 2 Ti 4 o 11 Preparation, wherein m=0.10, adding CuO with a mass percentage of 2wt% at the same time, together with secondary ball milling for 5 hours, granulating after grinding and drying, and double-layer sieving through 70 mesh and 120 mesh sieves, you can get the required Porcelain. The ceramic material is pressed into shape (sheet or column) as required, and then sintered in air at 900°C to 960°C for 2 to 3 hours to form porcelain, and the low-temperature sintered Ti-based microwave dielectric ceramic material can be obtained.

[0034] The performance of this group of ceramic materials reaches the following indicators:

[0035] Dielectric properties under microwav...

Embodiment 3

[0037] The chemical raw materials ZnO, Nb 2 o 5 , rutile TiO 2 According to the formula (Zn x Nb 2x ) Ti 1-3x o 2 Preparation, where x=0.15, after preparation, fully mix and ball mill for 4 hours, after grinding, dry, sieve, and briquette, then pre-fire at 800°C to 900°C, and keep warm for 12 hours, and then the pre-fired block After the sample is pulverized, it is subjected to secondary ball milling for 5 hours, after being ground and dried, it is granulated, and is sieved through a double layer of 70-mesh sieve and 120-mesh sieve to obtain the desired ceramic material. The ceramic material is pressed into shape (sheet or column) as required, and then sintered in air at 990°C-1140°C for 8-12 hours to form porcelain, and the low-temperature sintered Ti-based microwave dielectric ceramic material can be obtained.

[0038] The performance of this group of ceramic materials reaches the following indicators:

[0039] Dielectric properties under microwave ε r =86 (4.9GHz), ...

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PUM

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Abstract

The invention discloses a Ti-based microwave medium ceramics material by low-temperature sintering. The Ti-based microwave medium ceramics material takes rutile TiO2 as a main phase. The general formula of the prescription of the invention is that: (AxM2x)(NyTi1-y)1-3xO2, (BxM3x)(NyTi1-y)1-4xO2, (CxMx)(NyTi1-y)1-2xO2 or (1-m) TiO2-mBi2Ti4O11, wherein, the A is one of bivalent ions such as Zn<2+>, Cu<2+>, Ni<2+>, the B one of univalent ions such as Li<+>, the C one of trivalent ions such as Al<3+>, Fe<3+>, M is one of pentavalent ions such as Nb<5+>, Ta<5+>, Sb<5+>, N one of quadrivalent ions such as Zr< 4+ >, Sn< 4+ >, Mn< 4+ >; the X is more than or equal to 0 and less than or equal to 0.25, the Y more than or equal to 0 and less than or equal to 0.5, the m more than or equal to 0 and less than or equal to 0.15, the n is more than or equal to 0 and less than or equal to 2. The microwave medium ceramics material by low-temperature sintering has the advantages of high dielectric constant, low dielectric loss, wide covering range of temperature coefficient of resonant frequency, low sintering temperature, simple preparation technique and adjustable temperature coefficient of resonant frequency according to materials. The invention can be used for Low Temperature Co-fired Ceramics System (LTCC system) and used for producing microwave devices such as multi-media resonators, filters, etc.

Description

technical field [0001] The invention belongs to the field of electronic ceramics and its preparation, in particular to a Ti-based microwave dielectric ceramic material sintered at low temperature and its preparation method. Background technique [0002] With the development of mobile communication, portability requirements are put forward for the communication equipment system, and the whole system is moving towards integration, in order to obtain products with small size, light weight, high reliability and low cost. In the process of microwave circuit integration, the emergence of metal waveguides and microwave tubes has enabled microwave circuits to be integrated and miniaturized to a certain extent, but the bulky and bulky metal resonators traditionally used have made the integration of microstrip circuits difficult. Dielectric ceramics (microwave dielectric ceramics, MWDC) to make resonators has proposed a way out for this. Microwave dielectric ceramics used as dielectr...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/622H01B3/12
Inventor 汪宏庞利霞周迪姚熹
Owner XI AN JIAOTONG UNIV
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