Refractory oxides |
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| 申请号 | EP97107432.3 | 申请日 | 1994-06-14 | 公开(公告)号 | EP0791560A3 | 公开(公告)日 | 1997-11-05 |
| 申请人 | ALCAN INTERNATIONAL LIMITED; | 发明人 | Emblem, Harold; Davies, Thomas James, Materials Science Centre; | ||||
| 摘要 | A mixture suitable for firing to an oxide of the formula (II), Ba0.m(A1 2x Cr 2y 0 3 ), where 4.6 ≤ m ≤ 6.6; (x + y) = 1 ; and 0 ≤ y ≤ 0.5, said mixture comprising at least one of: (a) barium oxide; (b) a clean thermal precursor (as hereinbefore defined) of barium oxide, such as barium carbonate or barium hydroxide; and (c) barium mono-aluminate, Ba0.A1 2 0 3 ; with at least one of: (A) alumina, A1 2 0 3 ; (B) hydrated forms of alumina, such as boehmite, A1 2 0 3 .H 2 0; and (C) a clean thermal precursor (as hereinbefore defined) of aluminium oxide; and, where y is not zero, with at least one of (D) chromium (III) oxide, Cr 2 0 3 ; (E) hydrous chromium (III) oxide; and (F) a clean thermal precursor (as hereinbefore defined) of chromium (III) oxide, the relative amounts of the components of the mixture being adjusted to give the desired values of m and y when the mixture is heated. Also disclosed is a grain mix suitable for forming refractory and/or ceramic articles prepared by comminuting either or both of: (a) The above mixture and (b) an oxide of the formula (II), Ba0.m(A1 2x Cr 2y 0 3 ), where 4.6 ≤ m ≤ 6.6; (x + y) = 1 ; and 0 ≤ y ≤ 0.5. |
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