| 摘要 |
<p>A self-hardening compound for making casting moulds and cores containing a refractory filler, orthophosphoric acid, a magnesia-spinellid-type compound roasted at a temperature of 1600 to 1900 C during 40 to 1600 hours, and water at the following ratio of the said components in parts by weight: orthophosphoric acid 2-10; (the said magnesia-spinellid-type compound 2-20; water 0.5-6.0; refractory filler, balance). </p> |
