Medium microwave dielectric material and its preparation method and application

A microwave dielectric material and intermediary technology, applied in inorganic insulators, ceramics, etc., can solve the problems of deterioration of resonant frequency temperature coefficient, little research on low-temperature sintering, and difficulty in meeting practical applications, to improve the resonant frequency temperature coefficient and simple process. , the effect of short sintering time

Inactive Publication Date: 2013-03-27
YINGDE AOSHENG NEW MATERIALS CO LTD
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  • Description
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Problems solved by technology

[0005] Recently, Li with moderate dielectric constant 2 O-Nb 2 o 5 -TiO 2 System ceramic materials, due to their low intrinsic sintering temperature (~1100°C) and good microwave dielectric properties (ε r : 30~65, Q*f: 5000~8000GHz), which has aroused extensive attention of researchers, but there are not many studies on low-temperature sintering of this material
The properties of low-temperature sintered materials reported in a small number of literatures are not very good, especially after low-temperature sintering, the resonant frequency temperature coefficient τ of the material f It is worth deteriorating, and it is difficult to meet the needs of practical applications
It is reported in the literature that in 5Li with moderate dielectric constant 2 O-Nb 2 o 5 -5TiO 2 In the material, a single external doping of B 2 o 3 or V 2 o 5 , the sintering temperature of the material is lowered, but after the sintering temperature is lowered, the microwave dielectric properties of the material, especially the temperature coefficient of the resonant frequency, deteriorate, as high as 40ppm / ℃

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  • Medium microwave dielectric material and its preparation method and application
  • Medium microwave dielectric material and its preparation method and application
  • Medium microwave dielectric material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The raw material formula of the present embodiment is: 100 parts by weight Li 2 O-Nb 2 o 5 -TiO 2 System (Li 2 CO 3 , Nb 2 o 5 and TiO 2 The molar ratio is 1:0.2:1), add 2 parts by weight of ZnO, and add 1 part by weight of B 2 o 3 as a sintering aid.

[0037] The preparation steps are:

[0038] (1) Will Li 2 CO 3 , Nb 2 o 5 and TiO 2 Weigh at a molar ratio of 1:0.2:1, and weigh 2 parts by weight of ZnO, add ethanol according to the weight ratio of the mixture to ethanol at 1:1.0, mix in a rolling mill with a rotation speed of 200r / min for 36h, and bake at 60°C. Dry, then grind the dry powder with an agate mortar, put it into a high-alumina crucible, and pre-fire it at 800°C for 8h.

[0039] (2) Add 1 weight part of B to the powder after pre-burning 2 o 3 , be 1: 1.2 by the weight ratio of compound material and ethanol, add ethanol, be that 200r / min rolling mill mixes 36h at rotating speed, 60 ℃ dry stand-by, add 5wt% polyvinyl alcohol PVA aqueous solu...

Embodiment 2

[0045] The raw material formula of the present embodiment is: 100 parts by weight Li 2 O-Nb 2 o 5 -TiO 2 System (Li 2 CO 3 , Nb 2 o 5 and TiO 2 The molar ratio is 1:0.2:1), add 4 parts by weight of ZnO, and add 1 part by weight of B 2 o 3 as a sintering aid.

[0046] The preparation steps are:

[0047] (1) Will Li 2 CO 3 , Nb 2 o 5 and TiO 2 Weigh at a molar ratio of 1:0.2:1, and weigh 4 parts by weight of ZnO, add ethanol according to the weight ratio of the mixture to ethanol of 1:1.0, mix at a rolling mill at a speed of 400r / min for 18h, and dry at 100°C. Then the dry powder was ground with an agate mortar, put into a high-alumina crucible, and pre-fired at 900°C for 2 hours.

[0048] (2) Add 1 weight part of B to the powder after pre-burning 2 o 3 , be 1: 1.2 by the weight ratio of compound material and ethanol, add ethanol, be that 400r / min rolling mill mixes 18h at rotating speed, 100 ℃ dry stand-by, add 5wt% polyvinyl alcohol PVA alcohol solution ( Th...

Embodiment 3

[0053] The raw material formula of the present embodiment is: 100 parts by weight Li 2 O-Nb 2 o 5 -TiO 2 System (Li 2 CO 3 , Nb 2 o 5 and TiO 2 The molar ratio is 1:0.2:1), add 6 parts by weight of ZnO, and add 0.5 parts by weight of B 2 o 3 as a sintering aid.

[0054] The preparation steps are:

[0055] (1) Will Li 2 CO 3 , Nb 2 o 5 and TiO 2 Weigh at a molar ratio of 1:0.2:1, and weigh 6 parts by weight of ZnO, add ethanol according to the weight ratio of the mixture to ethanol of 1:0.6, mix in a rolling mill at a speed of 300r / min for 24h, and dry at 70°C. Then the dry powder was ground with an agate mortar, put into a high alumina crucible, and pre-fired at 850°C for 5h.

[0056] (2) Add 0.5 parts by weight of B to the powder after pre-burning 2 o 3 , be 1: 2 by the weight ratio of compound material and ethanol, add ethanol, be that 300r / min rolling mill mixes 24h at rotating speed, 70 ℃ dry stand-by, add 5wt% polyvinyl alcohol PVA aqueous solution (mass...

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Abstract

The invention discloses a medium microwave dielectric material, which comprises raw materials of, by weight, 100 parts of a Li2O-Nb2O5-TiO2 system, 0.5-8 parts of ZnO and 0.5-2 parts of B2O3. The preparation method provided by the invention comprises the following steps of: mixing the Li2O-Nb2O5-TiO2 system with ZnO, adding milling medium into the obtained mixture for wet ball milling, wherein the weight ratio of the mixture to the milling medium is 1: (0.6-2), drying at the temperature of 60-100 DEG C, pre-burning at the temperature of 800-900 DEG C for 2-8 hours, adding 2-8 wt% of a binder,molding at the pressure of 80-150 Mpa, sintering at the temperature of 840-950 DEG C, keeping warm for 1-4 hours to obtain the material provide by the invention. According to the invention, the temperature coefficient of resonate frequency is improved, the sintering temperature of the material drops to 840-940 DEG C, the temperature coefficient of resonate frequency ranges from minus 10ppm / DEG C to 10ppm / DEG C, and high-conductivity base metal Ag can be used as an inner electrode of a multilayer frequency device.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric material manufacturing, and in particular relates to an intermediate microwave dielectric ceramic material with a low temperature coefficient of resonance frequency and its preparation method and application. Background technique [0002] In recent years, with the rapid development of mobile communication technology, portability, miniaturization, high stability, chip type and low cost of terminal equipment have become an inevitable trend of development. Among them, multilayer chip microwave devices, including multilayer filters, duplexers, chip antennas, etc., have been developed rapidly. The development of multilayer microwave devices also puts forward higher requirements for microwave dielectric ceramics. [0003] The multilayer chip formation of microwave components requires microwave dielectric materials to be co-fired with high-conductivity metal electrodes such as Pt, Pd, Au, C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/12C04B35/462
Inventor 曾群
Owner YINGDE AOSHENG NEW MATERIALS CO LTD
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