| 主权项 |
1. A method for producing a single-phase ceramic converter material having a density of less than 97% and comprising a ceramic phase of composition A3B5O12 doped with cerium as a first activator, with A selected from a group consisting of elements Y, Gd, Lu, and combinations thereof, and B selected from a group consisting of elements Al, Ga, and combinations thereof, the method comprising the steps of:
weighing starting materials as A2O3, B2O3, and CeO2 in oxide form, wherein primary particles of the starting materials have a particle size of less than 1 micrometer; slurrying the starting materials in a suitable liquid to prepare a suspension; crushing and homogenizing the starting materials by wet milling using grinding media, in a first homogenization step; allowing the suspension to precipitate; further homogenizing the suspension in a second homogenization step; drying the starting materials by removing the liquid; uniaxially compressing the dried starting materials at a pressure from 10 to 50 MPa to form a green body; isostatically compressing the green body at a pressure from 100 to 300 MPa; burning the green body at a temperature in a range from 600 to 1000° C.; and reactively sintering the green body at a temperature in a range from 1550 to 1800° C. |
