9 results about "Microwave dielectric properties" patented technology

The application discloses a kind of multi-element mineral microwave dielectric ceramic materials and preparation method thereof, multi-element mineral microwave dielectric ceramic materials, by the following weight fraction raw materials sintering is obtained: 192~224 parts black talc, 160~192 parts wollastonite, 8~12 parts MgO, 4~8 parts SnO2, 2~4 parts kaolin tailings.Preparation method includes the following steps: broken fine sieving, obtain black talc powder, wollastonite powder and kaolin tailings powder;Take black talc powder and MgO powder, ball milling is mixed;Add wollastonite powder, continue ball milling;Drying, calcination, heat preservation, with furnace cooling;The obtained powder and proportionally weighed SnO2 powder, kaolin tailings powder, ball milling is uniformly mixed, drying;After powder preparation blank, sintering.The application improves the microwave dielectric properties of ceramic material, selects kaolin tailings powder as sintering additive, reduces sintering temperature under the premise of not reducing ceramic dielectric properties.

The application relates to the field of electronic information functional ceramics and electronic devices, and discloses a kind of ultra-low dielectric constant microwave dielectric ceramic and preparation method thereof, the composition expression of the ultra-low dielectric constant microwave dielectric ceramic is: xMg2SiO4-(1-x)LiAl 0.925 B 0.075 O2+ywt.%MO, MO is sintering aid, wherein: 0.2<=x<=0.4, 0.5<=y<=1, the sintering temperature of the ultra-low dielectric constant microwave dielectric ceramic is 1000~1100 DEG C, the dielectric constant of the microwave dielectric ceramic prepared by the application can reach 4.9~5.8, Qxf value can reach 51539~60754 GHz, frequency temperature coefficient Tf can reach-16.2~-11.3ppm / DEG C, the ultra-low dielectric constant microwave dielectric ceramic can be prepared at lower sintering temperature, meanwhile Qxf value is high, better microwave dielectric performance can be obtained, and the resonant frequency temperature coefficient is low, and temperature stability is good.

This invention relates to the field of dielectric ceramics technology, specifically to a low-dielectric-high-entropy microwave dielectric ceramic with a garnet structure and its preparation method. The chemical composition formula of the low-dielectric-high-entropy microwave dielectric ceramic with a garnet structure is Ca. 3 (Co 0.2 Cu 0.2 Mg 0.2 Zn 0.2 Ni 0.2 ) 2 SiV 2 O 12 By introducing the high-entropy effect into the garnet structure and optimizing the sintering temperature, a Ca with a garnet structure was successfully synthesized. 3 (Co 0.2 Cu 0.2 Mg 0.2 Zn 0.2 Ni 0.2 ) 2 SiV 2 O 12 Pure-phase low-dielectric-high-entropy microwave dielectric ceramics. They exhibit a dielectric constant of 6.5–10.4, a quality factor of 12490–62440 GHz, and a temperature coefficient of resonant frequency of -9.2–-7.4 ppm / ℃. These ceramics possess excellent microwave dielectric properties and have significant practical application value.

The invention discloses an Mg3TiO5 microwave dielectric material and a preparation method thereof, and belongs to the field of microwave dielectric materials, the chemical formula of the microwave dielectric material is Mg3TiO5, the Q * f of the microwave dielectric material is 198000GHz, and the fluctuation of the microwave dielectric property within the range of-50 DEG C to 200 DEG C is less than or equal to 5%; the preparation method comprises the following steps: (1) proportioning MgO or basic magnesium carbonate with the purity of more than 99% and the particle size of 400-600nm and TiO2 according to product element composition to obtain initial powder; (2) carrying out ball milling, drying, sieving and presintering on the initial powder obtained in the step (1), and then carrying out secondary ball milling, drying and sieving; and (3) adding a polyvinyl alcohol solution into the powder obtained in the step (2) for granulation, then carrying out compression molding, and sintering the obtained green body in the air atmosphere of 1320-1440 DEG C to obtain the Mg3TiO5 microwave dielectric material.

The present application relates to a kind of low dielectric loss and low temperature coefficient microwave dielectric ceramic and its preparation method, the preparation method includes the following steps: after mixing zinc lanthanum titanate, strontium source and auxiliary raw material, sequentially forming and sintering, the low dielectric loss and low temperature coefficient microwave dielectric ceramic is prepared;The auxiliary raw material includes any one or combination of at least two of calcium carbonate, manganese dioxide or barium carbonate.The present application selects zinc lanthanum titanate and strontium titanate with good microwave dielectric properties as basic raw material to ensure the basic performance of ceramic;Introduce appropriate amount of calcium carbonate, manganese dioxide and barium carbonate, effectively reduce the dielectric loss of ceramic, and improve its temperature characteristics;The present application reduces production cost and technical difficulty by solid phase reaction method, while ensuring the uniformity and stability of ceramic, effectively reduces the dielectric loss of microwave dielectric ceramic, and improves its temperature characteristics, further improves the performance of ceramic.

The application relates to the field of electronic information functional ceramics and electronic devices, and discloses a low-temperature sintering microwave dielectric material and a preparation method thereof. 0.98 (Li 2 / 3 Sn 1 / 3 ) 0.02 ]3TiO6‑(1‑x)Ca 0.8 Sm 0.4 / 3 TiO3+ywt.%MO, the MO being a sintering aid, wherein 0.1<=x<=0.5 and 0.4<=y<=1; the microwave dielectric material prepared by the application has excellent microwave dielectric properties: the dielectric constant can reach 40-55, the Qxf value can reach 45000-60000 GHz, and the frequency temperature coefficient tauf can reach 0.8-4.9 ppm / degree Celsius.

The invention discloses a low-temperature sintered microwave dielectric ceramic and a preparation method thereof, and the preparation method comprises the following steps: pre-sintered ceramic powder is subjected to wet sanding until the particle size D50 is 0.60-0.68 [mu] m to obtain ceramic slurry; under the condition of high-speed stirring, adding an acid solution into the ceramic slurry, and adjusting the pH value of the system to 9-10; sequentially adding an organic additive system containing a binder, a plasticizer, a dispersant, a lubricant, a defoaming agent and a surface modifier into the ceramic slurry; the obtained mixed slurry is sequentially subjected to drying, granulation, sieving, compression molding, glue discharging and sintering, and the microwave dielectric ceramic is obtained. By optimizing the powder pretreatment and organic additive introduction process, the method realizes full densification sintering of the ceramic at a low temperature of 1150-1250 DEG C, and successfully prepares the microwave dielectric ceramic with high density, excellent microwave dielectric properties and good surface quality.

This invention discloses a tungsten bronze-structured barium lanthanum titanium-based high-entropy microwave dielectric ceramic and its preparation method, belonging to the field of microwave dielectric ceramics. The chemical formula of the microwave dielectric ceramic is Ba4(La). 1 / 5Pr 1 / 5 Nd 1 / 5 Sm 1 / 5 Eu 1 / 5 ) 28 / 3 Ti 18 O 54 Its preparation method includes: mixing raw materials BaCO3, La2O3, and Pr6O 11 Nd₂O₃, Sm₂O₃, Eu₂O₃, and TiO₂ were formulated according to their chemical formulas, ball-milled, dried, and pre-fired at 1100–1200℃. After a second ball milling, drying, granulation, and sieving, the mixture was pressed into a green body and sintered at 1350–1500℃ to obtain a tungsten bronze structure barium lanthanum titanium-based high-entropy microwave dielectric ceramic. This invention introduces the concept of high entropy into tungsten bronze structure barium lanthanum titanium-based microwave dielectric ceramics for the first time. By controlling process parameters such as pre-firing temperature, sintering temperature, and sintering time, a high-entropy microwave dielectric ceramic with a single-phase tungsten bronze structure was successfully prepared. The high-entropy ceramic prepared by this invention exhibits excellent microwave dielectric properties, including a high dielectric constant, a high quality factor, and a low temperature coefficient of resonant frequency, and is expected to be widely used in the field of mobile communications.

The invention discloses a Ca2V2O7-based microwave dielectric ceramic and a preparation method thereof, and belongs to the technical field of electronic ceramics. Ni < 2 + > is used for carrying out doping modification on the A site of a Ca2V2O7 group, and the sintering characteristic and dielectric loss of the Ca2V2O7-based microwave dielectric ceramic are synchronously optimized from the crystal structure and phase composition level; through precise ion substitution, the effective reduction of the ceramic sintering temperature and the significant improvement of the quality factor are realized, so that the Ca2V2O7-based microwave dielectric ceramic with low loss and low-temperature sintering characteristics is obtained. According to the invention, no external sintering aid is added, the regulation of sintering dynamics and microstructure is realized by completely depending on the regulation of Ni < 2 + > on the crystal structure and phase composition of the Ca2V2O7 ceramic, and the negative effects of impurity phase and amorphous interface caused by the introduction of glass phase or low-melting-point compound are avoided; the stability of the microwave dielectric property of the Ca2V2O7-based microwave dielectric ceramic is ensured, and the reliability of the microwave dielectric ceramic is improved.