Low-temperature sintered SiO2-based microwave dielectric ceramic material and preparation method thereof
A technology of microwave dielectric ceramics and low-temperature sintering, which is applied in the field of ceramic materials and its preparation, can solve the problems of high electric constant, high sintering temperature, and low quality factor, and achieve low dielectric constant, low sintering temperature, and high quality factor. Effect
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Embodiment 1
[0021] Weigh the sintering aid analytically pure MgF 2 Powder 3.5g, analytically pure MnCO 3 Powder 1.5g, dry horizontal rolling mill, rolling time 3h, then placed in a high-temperature furnace for heat treatment at 625°C, holding time for 10min and then cooling with the furnace. The heat-treated composite sintering aid powder is placed in a ball mill tank with ethanol as the medium and ball milled for 3 hours, then taken out, and added to the slurry is amorphous SiO with a purity greater than 99%, a crystallinity of 0-10%, and a particle size of 700-800nm 2 After 100g of the powder, continue ball milling for 8 hours. Add polyvinyl alcohol accounting for 1.4wt% of the powder to the dried powder for mixing, and then slowly add polyvinyl alcohol accounting for 2.1wt% of the powder dropwise during the granulation process for granulation. The material is sieved to obtain a coarse powder between 50 mesh and 200 mesh, and then put it into a metal mold for cold pressing to form, pla...
Embodiment 2
[0023] Weigh the sintering aid analytically pure MgF 2 Powder 3g, analytically pure MnCO 3 Powder 2g, dry horizontal rolling mill, rolling time 4h, then placed in a high-temperature furnace for heat treatment at 525°C, holding time for 20min and then cooling with the furnace. The heat-treated composite sintering aid powder is placed in a ball mill tank with ethanol as the medium and ball milled for 1.5 hours, then taken out, and added to the slurry is amorphous SiO with a purity greater than 99%, a crystallinity of 0-10%, and a particle size of 700-800nm 2 After 100g of powder, continue ball milling for 9 hours, first add polyvinyl alcohol accounting for 2.5wt% of the powder to the dried powder and mix, then slowly add polyvinyl alcohol accounting for 2.5wt% of the powder drop by drop during the granulation process for granulation, granulation The material is sieved to obtain a coarse powder between 50 mesh and 200 mesh, and then put it into a metal mold for cold pressing to ...
Embodiment 3
[0025] Weigh the sintering aid analytically pure MgF 2 Powder 2.5g, analytically pure MnCO 3 The powder is 2.5g, and it is dry-processed horizontally for 3.5 hours, and then placed in a high-temperature furnace for heat treatment at 575°C. The holding time is 30 minutes and then cooled with the furnace. The heat-treated composite sintering aid powder is placed in a ball mill tank with ethanol as the medium and ball milled for 1 hour, then taken out, and added to the slurry is amorphous SiO with a purity greater than 99%, a crystallinity of 0-10%, and a particle size of 700-800nm 2 After 100g of powder, continue ball milling for 11 hours. First add polyvinyl alcohol accounting for 1.5wt% of the powder to the dried powder and mix it. During the granulation process, slowly add polyvinyl alcohol accounting for 1wt% of the powder for granulation. After sieving, the coarse powder between 50 mesh and 200 mesh is obtained, and then it is put into a metal mold and cold-pressed for mol...
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Abstract
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