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1. 发明专利

DE69019466T2 未知
公开(公告)号：DE69019466T2
公开(公告)日：1996-02-29
申请号：DE69019466
申请日：1990-10-04
申请人： PCC AIRFOILS INC
发明人： HORTON ROBERT A
IPC分类号： B22D21/02 , B22C1/00 , B22C1/12 , B22C3/00 , B22D11/00 , C01F17/00
摘要： Reactive metals such as titanium and nickel-chrome superalloys containing rare earths, are cast with mold and/or core surface areas formed from an improved slurry. The improved slurry contains yttria to form an inert surface which is exposed to the molten reactive metal. In order to prevent premature gelation of the slurry, the forming of defects in the mold and/or core surface areas, and the forming of defects in the cast article, the slurry contains a source of hydroxyl ions sufficient to result in the slurry having a pH of at least 10.2 six days after initially mixing the slurry. The source of hydroxyl ions may be an alkali metal or an organic hydroxide. The source of hydroxyl ions is believed to function as a hydration suppressant for the yttria to prevent premature gelation of the slurry. The slurry preferably contains a silica to alkali ratio which is equivalent to a silica to sodium oxide (Na2O) dry weight ratio of less than 30:1.

2. 发明专利

DE69019466D1 未知
公开(公告)号：DE69019466D1
公开(公告)日：1995-06-22
申请号：DE69019466
申请日：1990-10-04
申请人： PCC AIRFOILS INC
发明人： HORTON ROBERT A
IPC分类号： B22D21/02 , B22C1/00 , B22C1/12 , B22C3/00 , B22D11/00 , C01F17/00
摘要： Reactive metals such as titanium and nickel-chrome superalloys containing rare earths, are cast with mold and/or core surface areas formed from an improved slurry. The improved slurry contains yttria to form an inert surface which is exposed to the molten reactive metal. In order to prevent premature gelation of the slurry, the forming of defects in the mold and/or core surface areas, and the forming of defects in the cast article, the slurry contains a source of hydroxyl ions sufficient to result in the slurry having a pH of at least 10.2 six days after initially mixing the slurry. The source of hydroxyl ions may be an alkali metal or an organic hydroxide. The source of hydroxyl ions is believed to function as a hydration suppressant for the yttria to prevent premature gelation of the slurry. The slurry preferably contains a silica to alkali ratio which is equivalent to a silica to sodium oxide (Na2O) dry weight ratio of less than 30:1.

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