Low-temperature sintered Ca5Mn4V6O24 microwave dielectric material and preparation method thereof
A microwave dielectric material and low-temperature sintering technology, applied in the field of electronic materials, can solve the problems of uncertain V element non-stoichiometric ratio, unknown influence, vanadium volatilization, etc., and achieve the effects of abundant reserves, easy control, and uniform grain growth.
Inactive Publication Date: 2018-10-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] Since V 2 o 5 The melting point is very low (690°C), Ca 5 mn 4 (VO 4 ) 6 There is a phenomenon of vanadium volatilization in the sintering process of microwave dielectric materials, which leads to the existence of uncertain non-stoichiometric ratio of V element in the system, and the non-stoichiometric ratio of vanadium element also affects its microwave dielectric properties. in the unknown
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1～ Embodiment 5
[0026] The chemical expression of the microwave medium provided in the foregoing embodiments is: Ca 5+a mn 4+b V 6+c o 24 , wherein, a=b=0, c=-0.10; the specific preparation steps of the microwave medium are as follows:
[0027] Step 1: Ingredients; CaCO 3 , MnCO 3 , V 2 o 5 powder according to Ca 5 mn 4 V 5.9 o 24 The molar ratio of ingredients;
[0028] Step 2: Ball mill once; put the mixture obtained in step 1 into a nylon tank, and ball mill for 6 to 8 hours, use zirconium balls as the balls, deionized water as the ball milling medium, pass through a 60-mesh sieve after ball milling and drying, and obtain dry Powder;
[0029] Step 3: pre-calcining; pre-calcining the dry powder obtained in step 2 at 775-825°C for 2-4 hours to obtain a pre-calcined material;
[0030] Step 4: secondary ball milling; the calcined material obtained in step 3 is subjected to secondary ball milling, after ball milling, it is dried at 100°C and passed through a 60-mesh sieve;
[0031...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| sintering temperature | aaaaa | aaaaa |
| resonant frequency temperature coefficient | aaaaa | aaaaa |
| relative permittivity | aaaaa | aaaaa |
Login to View More
Abstract
The invention belongs to the technical field of electronic materials, and particularly provides a low-temperature sintered Ca5Mn4V6O24 microwave dielectric material and a preparation method thereof. By adopting a non-stoichiometric ratio, an optimum ratio is obtained: Ca5+aMn4+bV6+cO24, wherein a+b+c=-0.15, a is greater than or equal to -0.15 and less than or equal to 0, b is greater than or equalto -0.15 and less than or equal to 0, and c is greater than or equal to -0.15 and less than or equal to 0. The optimum ratio of V element is included: the absence of V element helps increase the order degree of cation and grain growth is more uniform. The quality factor (Q*f value) of the microwave dielectric material is higher than the value under the stoichiometric ratio. Meanwhile, the preparation process of the microwave dielectric material is simple, the sintering temperature is low, and then energy is saved. No sintering aid is needed in the preparation process, and the formed phase iseasy to control. While maintaining excellent dielectric properties, the preparation process is effectively simplified. In addition, raw materials are inexpensive and reserves are abundant in the preparation process. Thus, it is possible to achieve low-cost industrial production of high-performance microwave ceramic substrates.
Description
technical field [0001] The invention belongs to the technical field of electronic materials, in particular to a low-temperature sintered Ca 5 mn 4 V 6 o 24 Microwave dielectric material and its preparation method. Background technique [0002] With the continuous development of electronic information technology towards high frequency and digitalization, the requirements for miniaturization, integration and modularization of devices are becoming increasingly urgent. Low Temperature Co-fired Ceramic (LTCC) technology is widely used in the manufacture of integrated electronic components due to its high integration density and good high-frequency characteristics. [0003] Microwave dielectric materials used in LTCC technology should have the following characteristics: (1) suitable dielectric constant; (2) high quality factor to reduce loss, generally requiring Q×f≥10000GHz; (3) good compatibility with silver or copper Co-sintering, which requires the sintering temperature o...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/3208C04B2235/3262C04B2235/656C04B2235/96
Inventor 李波邱磊
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA