LOW-TEMPERATURE-BAKED DIELECTRIC PORCELAIN AND ITS PRODUCTION

Japanese Patent JP3216967

B2

PURPOSE: To increase a value of no-load Q in a microwave region and reduce the temperature coefficient of resonance frequency by adding glass powder to a calcined powder comprising a BaO.xTiO2 composition and a specific metallic oxide and baking the resultant mixture.
CONSTITUTION: This low-temperature baked dielectric porcelain is obtained by blending 100 pts.wt. composition of the formula BaO.xTiO2 [3.0≤(x)≤5.71 with 0.1-20 pts.wt. ZnO, 0.1-1 pt.wt. To2O5, ≤1 pt.wt. WO3, ≤15 pts.wt. SnO2, ≤15 pts.wt. MgO, ≤15 pts.wt. SrO and ≤5 pts.wt. ZrO2, calcining the resultant blend at 900-1200°C), then pulverizing the calcined blend, providing a calcined powder having 1-3μm average particle diameter, adding 0.1-20 pts.wt. glass powder having ≤450°C transition point, 0.1-1.5μm average particle diameter and a smaller average particle diameter than that of the calcined powder to 100 pts.wt. resultant calcined powder, forming the prepared mixture into a prescribed shape and subsequently baking the formed compact at 850-1000°C. The resultant porcelain has ≤5.0wt.% percentage of water absorption and ≥2000GHz as product of no-load Q value and resonance frequency (measured inc 1-5GHz measurement frequency according to a parallel conductor plate type dielectric resonator method).

Hidetoshi Mizutani
Masahiko Okuyama
Noritaka Yoshida
Hirofumi Ozeki
Hiroshi Katagiri

JP8739795A

October 09, 2001

March 20, 1995

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Nippon Special Ceramics Co., Ltd.

C04B35/46; C04B35/468; H01B3/12; H01P7/10; (IPC1-7): C04B35/46; H01B3/12

JP6321631A
JP6215624A
JP570222A

Kiyomichi Kojima

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