| abstract |
A method for manufacturing a microwave dielectric ceramic material, comprising: mixing mechanically and uniformly a powder mixture of a carbonate, aluminum oxide, lanthanum oxide, and titanium dioxide, forming powder particles; high-energy ball milling for the first time the powder particles to refine uniformly the powder particles; high-temperature sintering in a sealed container the powder that was high-energy ball milled for the first time, forming a precursor powder; and high-energy ball milling for the second time the precursor powder to further refine uniformly the precursor powder, forming a ceramic powder. The present invention allows for lowered sintering temperature, for reduced sintering time, for reduced production costs and technical difficulty, and for high densification. |