Novel ultra-low-loss microwave dielectric ceramic material and preparation method thereof

A microwave dielectric ceramic, ultra-low technology, applied in the field of ultra-low loss microwave dielectric ceramic materials, can solve problems such as difficult control, deterioration of microwave performance, complex phase composition of material system, etc., achieve stable performance, performance improvement, and increase process complexity Effect

Active Publication Date: 2016-11-23
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although Li 2 Mg 3 BO 6 Microwave ceramics have extremely low loss, but have the same defects as most original microwave ceramics
First, under the high-temperature sintering environment of 1280°C to 1380°C, Li + The severe volatilization of ions leads to Li 2 Mg 3 SnO 6 and Li 2 Mg 3 ZrO 6 The second phase Mg exists in 2 SnO 4 (ε r =8.3, Q×f=55000GHz, τ f =-61ppm / ℃) and the second phase ZrO 2 , the existence of the second phase will make Li 2 Mg 3 SnO 6 and Li 2 Mg 3 ZrO 6 The microwave performance of the base material is severely deteriorated, and there is a problem that the phase composition of the material system is complicated and difficult to control; secondly, the large negative frequency temperature coefficient makes Li 2 Mg 3 BO 6 Microwave ceramics cannot meet the needs of practical applications

Method used

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  • Novel ultra-low-loss microwave dielectric ceramic material and preparation method thereof
  • Novel ultra-low-loss microwave dielectric ceramic material and preparation method thereof
  • Novel ultra-low-loss microwave dielectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: Dosing; as Mg(OH) 2 4MgCO 3 ·5H 2 O (basic magnesium carbonate) 62.64%, Li 2 CO 3 16.79%, TiO 2 17.88% and CaCO 3 2.69% mass percentage batching obtains mixture;

[0035] Step 2: ball milling; the mixture obtained in step 1 is ball milled for the first time to obtain a ball mill, and the specific ball milling process is: using zirconia balls as the ball milling medium, according to the mass ratio of mixture: ball: ethanol is 1: 5: 3. Grind for 7 hours to obtain a uniformly mixed ball mill;

[0036] Step 3: drying and sieving; drying the ball mill material obtained in step 2 and passing it through a 100-mesh sieve to obtain a dry powder;

[0037] Step 4: pre-burning; the dry powder obtained in step 3 is placed in an alumina crucible to pre-fire to obtain a pre-fired powder;

[0038] Step 5: ball milling; ball milling the calcined powder obtained in step 4 or adding a dopant to the calcined powder to obtain a ball milling material after the second ball mil...

Embodiment 2

[0043] Step 1: Dosing; as Mg(OH) 2 4MgCO 3 ·5H 2O (basic magnesium carbonate) 63.56%, Li 2 CO 3 16.69%, TiO 2 17.78% and SrCO 3 1.97% mass percentage batching obtains mixture;

[0044] Step 2: ball milling; the mixture obtained in step 1 is ball milled for the first time to obtain a ball mill, and the specific ball milling process is: using zirconia balls as the ball milling medium, according to the mass ratio of mixture: balls: ethanol is 1: 6: 3. Grind for 7 hours to obtain a uniformly mixed ball mill;

[0045] Step 3: drying and sieving; drying the ball mill material obtained in step 2 and passing it through a 100-mesh sieve to obtain a dry powder;

[0046] Step 4: pre-burning; the dry powder obtained in step 3 is placed in an alumina crucible to pre-fire to obtain a pre-fired powder;

[0047] Step 5: ball milling; ball milling the calcined powder obtained in step 4 or adding a dopant to the calcined powder to obtain a ball mill after the second ball milling, the sp...

Embodiment 3

[0052] Step 1: Dosing; according to Mg(OH) 2 4MgCO 3 ·5H 2 O (basic magnesium carbonate) 62.51%, Li 2 CO 3 16.24%, TiO 2 The mass percent batching of 17.30% and MgO3.00% obtains mixture;

[0053] Step 2: ball milling; the mixture obtained in step 1 is ball milled for the first time to obtain a ball mill, and the specific ball milling process is: using zirconia balls as the ball milling medium, according to the mass ratio of mixture: balls: ethanol is 1: 6: 2. Grind for 7 hours to obtain a uniformly mixed ball mill;

[0054] Step 3: drying and sieving; drying the ball mill material obtained in step 2 and passing it through a 100-mesh sieve to obtain a dry powder;

[0055] Step 4: pre-burning; the dry powder obtained in step 3 is placed in an alumina crucible to pre-fire to obtain a pre-fired powder;

[0056] Step 5: ball milling; ball milling the calcined powder obtained in step 4 or adding a dopant to the calcined powder to obtain a ball mill after the second ball milli...

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Abstract

The invention discloses a novel ultra-low-loss microwave dielectric ceramic material and a preparation method thereof and belongs to the technical field of electronic information functional materials and devices. The general chemical formula of the ceramic material is Li(2+a)(Mg(1-b)Xb)3YO6.cZ, wherein X refers to Ca<2+> or Sr<2+>, Y refers to Ti<4+>, Sn<4+> or Zr<4+>, Z refers to one of MgO, ZnO and CaF2 or a combination of MgO, ZnO and CaF2, a is larger than or equal to 0.03 and smaller than or equal to 0.15, b is larger than or equal to 0.01 and smaller than or equal to 0.04, and c is larger than or equal to 0 and smaller than or equal to 0.15. Raw materials of the microwave dielectric ceramic material are prepared as per the general chemical formula, subjected to ball-milling mixing for the first time, pre-sintered at 980-1,200 DEG C, then subjected to ball-milling mixing for the second time and sintered at 1,250-1,400, and the material is prepared; the crystalline phase of a finished product is a cubic phase adopting an ordered rock salt structure. The performance of the microwave dielectric ceramic material is greatly improved, the relative dielectric constant epsilonr of the microwave dielectric ceramic material is adjustable in a range of 8-20, the quality factor Q*f value is in a range of 92,000-153,000 GHz, meanwhile, the temperature coefficient tauf of resonance frequency ranges from -23 ppm / DEG C to 5 ppm / DEG C, and the material has the stable performance and can meet the application requirements of modern microwave devices.

Description

technical field [0001] The invention belongs to the technical field of electronic information functional materials and devices, and specifically relates to an ultra-low loss microwave dielectric ceramic material with a frequency temperature coefficient close to zero. Background technique [0002] At present, information technology is developing rapidly in the direction of high frequency, high power, integration, and multi-function, and with the rapid development of modern mobile communication technology and Internet of Things technology, high-frequency microwave There are extensive and important applications in systems such as sensing Internet of Things radio frequency technology. In high-frequency microwave circuits, many microwave devices need to use dielectric ceramic materials as substrates, making microwave ceramic dielectric substrate materials increasingly become the key basic materials used in microwave devices, components and complete machine systems. High-frequenc...

Claims

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Application Information

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IPC IPC(8): C04B35/465C04B35/47C04B35/457C04B35/48C04B35/622C04B35/626
CPCC04B35/457C04B35/465C04B35/47C04B35/48C04B35/622C04B35/62615C04B2235/3203C04B2235/3206C04B2235/3208C04B2235/3213
Inventor 唐斌方梓烜司峰钟朝位张树人
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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