Patent ID: 11858855
Assignee: YANGTZE DELTA REGION INSTITUTE (HUZHOU), UNIVERSITY OF ELECTRONIC SCIENCE AND TECHNOLOGY OF CHINA
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 3:
4. A preparation method of the microwave dielectric ceramic material as claimed in claim 1, comprising following steps:
proportioning the base material: proportioning raw powders of ZnO, CuO, TiO2, Zr02, Nb2O5 according to the chemical formula (Zn0.9Cu0.1)0.15Nb0.3(Ti0.9Zr0.1)0.55O2 to obtain a pre-prepared powder,
grinding: putting the pre-prepared powder into a ball milling tank, selecting zirconium balls and deionized water as grinding media, and then performing ball milling on the pre-prepared powder in a planetary ball mill for 4 hours to 6 hours to obtain a mixed slurry, drying the mixed slurry in an oven to obtain a first dried powder after the ball milling is completed, and then sieving the first dried powder by a screen to obtain a ground powder, and pre-sintering the ground powder in an atmospheric atmosphere at 900° C. to 1000° C. for 4 hours to 6 hours to obtain a pre-sintered material;
proportioning the chemical compositions of the glass material: weighing and mixing raw powders of the chemical compositions of the glass material according to a preset ratio to obtain a glass powder, selecting zirconium balls and alcohol as grinding media, and then performing ball milling on the glass powder in a planetary ball mill for 6 hours to 8 hours to obtain a ball-milled powder, drying the ball-milled powder to obtain a second dried power, and then pre-sintering the second dried power for 3 hours to 6 hours at 600° C. to 650° C., followed by heating to 1450° C. to 1550° C. for melting for 4 hours to 6 hours to obtain glass melt, pouring the glass melt into ionized water for cooling to obtain a glass, and grinding the glass into uniform fine powders, thereby obtaining the glass material;
mixing: adding the obtained glass material into the pre-sintered material according to the percent by weight to obtain a mixed powder, selecting zirconium balls and deionized water as grinding media, and then performing ball milling on the mixed powder in a planetary ball mill for 3 hours to 5 hours to obtain a ball-milled mixed powder, drying the ball-milled mixed powder to obtain a third dried powder, and then adding a binder into the third dried powder to granulate, thereafter obtaining a ceramic raw material; and
sintering to prepare the microwave dielectric ceramic material: pressing and molding the ceramic raw material, discharging the ceramic raw material for 2 hours to 4 hours at a temperature of 400° C. to 450° C. with a heating rate of 2° C. per minute (° C./min) to 4° C./min, heating to 850° C. to 900° C. with the same heating rate of 2° C./min to 4° C./min, followed by heat preserving for 4 hours to 6 hours, thereby obtaining the microwave dielectric ceramic material.