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Molybdenum-based ultralow-temperature sintering microwave medium ceramic materials and preparation method thereof

A technology for microwave dielectric ceramics and ceramic materials is applied in the field of molybdenum-based ultra-low temperature sintering microwave dielectric ceramic materials and its preparation, which can solve the problems of deteriorating microwave dielectric properties of ceramics, difficult preparation of powders, low efficiency, etc. Simple preparation process, good microwave performance and low sintering temperature

Inactive Publication Date: 2010-10-27
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the first method is that powders with small particle sizes are not easy to prepare, and wet chemical methods are generally used, etc., with high efficiency and low cost.
The disadvantage of the second method is that the addition of sintering aids often introduces impurity phases and deteriorates the microwave dielectric properties of ceramics. However, it has always been a very popular method because of its low price and simple experimentation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Raw material MoO will be analyzed for purity 3 , Li 2 CO 3 and ZnO by formula Li 2 Zn 2 Mo 3 o 12 preparation. After preparation, fully mix and ball mill for 4 hours, then dry, sieve, briquette, and pass through 600 o C pre-fired for 4 hours, then pulverized the pre-fired block sample and then ball milled for 5 hours, ground and dried, then granulated, and sieved through double-layer sieves of 60 mesh and 120 mesh to obtain required porcelain. Press the ceramic material into shape (sheet or column) as needed, and then in 590 o C~670 o C sintering in air for 2~3h to form porcelain, and the ultra-low temperature sintered molybdenum-based microwave dielectric ceramic material can be obtained.

[0029] The performance of this group of ceramic materials reaches the following indicators:

[0030] 590 o C~670 o C is sintered into porcelain in air, and the dielectric properties ε under microwave r =11.1 (14.63GHz), quality factor Q=4,800, Qf=70,000GHz, resonant fr...

Embodiment 2

[0032] Raw material MoO will be analyzed for purity 3 , Li 2 CO 3 and Al 2 o 3 According to the formula Li 3 AlMo 3 o 12 preparation. After preparation, fully mix and ball mill for 4 hours, then dry, sieve, briquette, and pass through 500 o C pre-fired for 4 hours, then pulverized the pre-fired block sample and then ball milled for 5 hours, ground and dried, then granulated, and sieved through double-layer sieves of 60 mesh and 120 mesh to obtain required porcelain. Press the ceramic material into shape (sheet or column) as needed, and then in 510 o C~570 o C sintering in air for 2~3h to form porcelain, and the ultra-low temperature sintered molybdenum-based microwave dielectric ceramic material can be obtained.

[0033] The performance of this group of ceramic materials reaches the following indicators:

[0034] 510 o C~570 o C is sintered into porcelain in air, and the dielectric properties ε under microwave r =9.5 (14.13GHz), quality factor Q=3,500, Qf=50,000...

Embodiment 3

[0036] Raw material MoO will be analyzed for purity 3 , Li 2 CO 3 and In 2 o 3 According to the formula Li 3 InMo 3 o 12 preparation. After preparation, fully mix and ball mill for 4 hours, then dry, sieve, briquette, and pass through 550 o C pre-fired for 4 hours, then pulverized the pre-fired block sample and then ball milled for 5 hours, ground and dried, then granulated, and sieved through double-layer sieves of 60 mesh and 120 mesh to obtain required porcelain. Press the ceramic material into shape (sheet or column) as needed, and then in 590 o C~650 o C sintering in air for 2~3h to form porcelain, and the ultra-low temperature sintered molybdenum-based microwave dielectric ceramic material can be obtained.

[0037] The performance of this group of ceramic materials reaches the following indicators:

[0038] 590 o C~650 o C is sintered into porcelain in air, and the dielectric properties ε under microwave r =9.8 (15.02GHz), quality factor Q=2400, Qf=36,000G...

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Abstract

The invention discloses molybdenum-based ultralow-temperature sintering microwave medium ceramic materials and a preparation method thereof. Based on a general structural formula of A4B3O12, a series of ceramic materials, which can be sintered at a temperature lower than 7,000 DEG C and have excellent microwave dielectrical properties ( a dielectric constant of 8.5 to 11.1 and a quality factor Qfof between 36,000 and 108,000GHz), can be obtained by using low-valence cation (such as Li<+>, Zn<2+>, Ca<2+>, Cu<2+>, Mg<2+>, Al<3+>, In<3+>, Cr<3+> and Ga<3+>) composite at a position A and a high-valence cation Mo<6+> at a position B and by using the conventional solid-phase reaction sintering method. The concrete structural expression of the ceramic material comprises Li2M<2+>2(MoO4)3(M<2+> may be Zn<2+>, Ca<2+>, Cu<2+> and Mg<2+>) and Li3M<3+>(MoO4)3(M<3+> may be Al<3+>, In<3+>, Cr<3+> and Ga<3+>).

Description

technical field [0001] The invention belongs to the field of electronic ceramics and its preparation, in particular to a molybdenum-based ultra-low temperature sintered microwave dielectric ceramic material sintered at low temperature and its preparation. Background technique [0002] In recent years, due to the development of microwave technology and equipment towards miniaturization, integration and civilian use, large-scale research work on microwave dielectric materials has been launched internationally. With the widespread use of LTCC (low temperature co-fired ceramics) technology in recent years, the search, preparation and research of low-loss (Qf>5000GHz) low-fire (lower than the melting point of common metals such as Ag, Cu, Au, Al) and metal electrodes New microwave dielectric ceramics with sintering matching, low cost (no or a small amount of precious metals), and environmental protection (at least lead-free, and as far as possible no or less toxic raw mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 周迪汪宏姚熹庞利霞吴新光郭靖张高群
Owner XI AN JIAOTONG UNIV
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