Low dielectric constant LTCC material and preparation method thereof

A low dielectric constant and raw material technology, applied in the field of low dielectric constant LTCC materials and their preparation, can solve the problems of low Q×f value, not showing the microwave dielectric properties of LMS series ceramics, and reducing the sintering temperature, etc. Achieve low dielectric constant, good process stability, and promote the effect of ceramic sintering

CN111574213AActive Publication Date: 2020-08-25UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-08-25

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Abstract

The invention discloses a Li2O-MgO-SiO2 series LTCC material and a preparation method thereof, and relates to the technical field of electronic materials. The Li2O-MgO-SiO2 series LTCC material comprises the following raw materials: 98.0-100.0 wt% of a Li2O-MgO-SiO2 ceramic material and 0.0-2.0 wt% of lanthanum-boron-zinc glass. The LMS ceramic material is composed of Li2CO3, MgO and SiO2, and a ceramic main material with Li2MgSiO4 as a main crystalline phase is synthesized according to the molar ratio of Li2CO3 to MgO to SiO2 being 1: 1: 1; the lanthanum-boron-zinc glass comprises the following raw materials: 45wt% < = La2O3 < = 47wt%, 28wt% < = B2O3 < = 32wt%, and 21wt% < = ZnO < = 25wt%. The components are subjected to weighing, primary ball milling, presintering, sieving, secondary ball milling, granulation, molding and other processes and then sintered in air at the temperature of 850-925 DEG C to obtain the LTCC material. The low-temperature sintered LTCC material is low in raw material price and extremely low in device production cost, and has a relatively low dielectric constant, a relatively high quality factor and good process stability after detection.
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Description

technical field

[0001] The invention belongs to the technical field of electronic materials and devices, and in particular relates to a low dielectric constant LTCC material and a preparation method thereof. Background technique

[0002] In recent years, the wave of informatization has swept the world, mobile communication and wireless local area network (WLAN) and other modern communication technologies have developed rapidly, and microwave technology has also developed towards higher frequencies. The rapid development of the fifth-generation mobile communication has made mobile communication equipment and portable terminals tend to be small, light, high-frequency, low power consumption, multi-functional, and high-performance. This poses a new challenge for microwave circuit components based on microwave dielectric ceramics With higher requirements, various new microwave dielectric components have emerged, and related microwave dielectric ceramic materials are developing to...

Examples

preparation example Construction

[0031] The present invention also provides a kind of preparation method of low dielectric constant LTCC material, comprises the following steps:

[0032] Step 1: Preparation of ceramic main material, Li 2 O-MgO-SiO 2 Ceramic materials with Li 2 CO 3 , MgO, SiO 2 As raw material, mole ratio Li 2 CO 3 :MgO:SiO 2 = 1:1:1 synthesized main crystal phase is Li 2 MgSiO 4 The main ceramic material; mix the mixed ingredients with deionized water, wet ball mill for 2 to 5 hours, dry and then sieve, grind evenly, pre-fire at 850-930°C for 4 hours to synthesize the main crystal phase as Li 2 MgSiO 4 Phase Li 2 O-MgO-SiO 2 Ceramic base material;

[0033] Step 2: Preparation of glass additive, La 2 o 3 , B 2 o 3 , ZnO by mass percentage: 45%≤La 2 o 3 ≤47%, 28%≤B 2 o 3 ≤32%, 21%≤ZnO≤25% ingredients, mix the prepared materials with deionized water, wet ball mill for 2-5 hours, dry and then sieve, pre-burn at 600-800°C for 4 hours, and then Melt the glass slag at a tempera...

Embodiment 1

[0041] A kind of low dielectric constant LTCC material, be 100% Li by mass percentage 2 MgSiO 4 Composition, Li 2 MgSiO 4 The molar ratio of each component in Li is 2 O:MgO:SiO 2 =1:1:1, the sintering condition is 1250°C / 2h.

[0042] The above-mentioned low dielectric constant LTCC material is obtained by the following preparation method:

[0043] Preparation of Li 2 MgSiO 4 , Li 2 O-MgO-SiO 2 Ceramic materials with Li 2 CO 3 , MgO, SiO 2 As raw material, mole ratio Li 2 CO 3 :MgO:SiO 2 = 1:1:1 synthesized main crystal phase is Li 2 MgSiO 4 The ceramic main material (chemical equation is Li 2 CO 3 +MgO+SiO 2 = Li 2 MgSiO 4 ); Mix the mixed ingredients with deionized water, wet ball mill for 2 to 5 hours, dry and then sieve, grind evenly, pre-fire at 850-930°C for 4 hours to synthesize the main crystal phase as Li 2 MgSiO 4 Phase Li 2 O-MgO-SiO 2 Ceramic base.

Embodiment 2

[0045] A low dielectric constant LTCC material, according to mass percentage, its composition includes: 0.5% lanthanum boron zinc glass, 99.5% Li 2 MgSiO 4 ceramic powder;

[0046] The specific components of the lanthanum boron zinc glass are: 45.00% La 2 o 3 , 30.00% B 2 o 3 , 25.00% ZnO; the Li 2 MgSiO 4 The molar ratio of each component in the ceramic powder Li 2 O:MgO:SiO 2 =1:1:1.

[0047] The preparation method of embodiment 2 comprises the following steps:

[0048] Step 1: According to the composition ratio requirements of the lanthanum-boron-zinc glass (45.00% La 2 o 3 , 30.00% B 2 o 3 , 25.00% ZnO), the La 2 o 3 , B 2 o 3 , ZnO powder for uniform mixing ((chemical equation is Li 2 CO 3 +MgO+SiO2 = Li 2 MgSiO 4 )); mill the uniformly mixed powder for 4 hours, then dry and sieve, pre-fire at 700°C for 4 hours, melt at 1200°C for 1 hour, and cool with the furnace to obtain glass slag, which is crushed to obtain Lanthanum boron zinc glass powder;

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