Investment compound for use in precision casting mold
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United States of America Patent
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Aug 14, 1990
Issued Date -
N/A
app pub date -
Oct 20, 1989
filing date -
Jul 27, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An investment compound for use in a precision casting mold comprises MgO powder and Al.sub.2 O.sub.3 powder as main constituents in such a manner that the MgO powder and/or the Al.sub.2 O.sub.3 powder are or is in the range of 100 .mu.m or less in grain size and of 10% or more in weight precent, whereby even when a high-temperature active casting material such as titanium is used, the material provides a casting having a very beautiful surface with no bubbles formed therein and can positively compensate for shrinkage due to the solidification of cast material in a lost-wax process and can advantageously provide the casting at lower prices.
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