| 摘要 |
Alumina-based ceramics for core materials having a good leachability and being non reactive with the alloy up to 1800 DEG C. …<??>The ceramic material, before firing, consists of at least an alumina-based compound material having the general formula MO.NAl2O3, wherein M is Na2, Ca, Sr or Ba, N is from 9 to 11 when M is Na2 and N is 6 when M is Ca, Sr or Ba, and is, after firing, being characterized by a density of from 40 percent to 75 percent of theoretical and an interconnected network defining a plurality of interstices in which undoped alumina grains are found. …<??>Application for making cores for casting directionally solidified eutectic and superalloy materials. |
